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See detailExtent of paleofires and past human settlements in the current rainforest patchwork of the Northern Republic of Congo
Gillet, Jean-François ULg; Doucet, Jean-Louis ULg

Poster (2012, January 04)

Objectives The origins of the patchwork of lowland semi-deciduous forests in the Northern Republic of Congo were apprehended. The aim of this study was to show that dense forests suffered fewer ... [more ▼]

Objectives The origins of the patchwork of lowland semi-deciduous forests in the Northern Republic of Congo were apprehended. The aim of this study was to show that dense forests suffered fewer disturbances than the open canopy forest types. Old disturbances associated with fires and human settlements seem to have had and still have today a substantial impact on the physiognomy and the composition of the forest types. Understanding past forest dynamics is a major component to predict the effects of both present climate change and human activities. Method Fifteen locations were studied along a 400-km-long SW-NE gradient in the NW of the Congo Basin through the ERA-net BiodivERsA CoForChange project. An anthraco-archaeological study was carried out in association with floristic inventories of three strata. Two main geology substrates were considered: the Mesozoic sandstones and Quaternary alluvial deposits. The abundance of charcoal fragments and human artifacts were evaluated by a network of 1-m-deep boring augers (n =208) and a 1.5-m-deep reference soil pit (n =15) in each site. A rating system was used to quantify the abundance of charcoal, charred Elaeis guineensis seeds and other artifacts (ceramic and metallurgic slag). Estimations were based on 20-cm-depth intervals (augers) or on pedological layers (pits). Twelve radiocarbon dating were performed in the major disturbed layers of each vegetation type studied. Results Two main groups of vegetation were highlighted according to the relative openness of the woody stand, the importance of the woody regeneration, and the development of the herbaceous cover. The two dense forests sampled were preferentially found in the northern part: the dense forest with Manilkara mabokeensis and Haumania dankelmaniana, and the Gilbertiodendron dewevrei forest on dry land. Most parts of the understorey exhibited the woody regeneration. The southern part presented more openness including the largest areas of open canopy vegetation types. Three forest types were identified: the Macaranga barteri pioneer forest, the open canopy vegetation type with Aframomum and Marantaceae, and the sparse forest with Megaphrinium macrostchyum and/or Haumania liebrestisiana. The understorey was a dense thicket of giant herbs belonging to the families Marantaceae and Zingiberaceae, causing a very scarce woody regeneration. Regardless the auger depth, charcoals were more profuse in the soils of the southern open canopy vegetation types (2-Way ANOVA, F=5.46, p=0.02). As in pit layers, charred oil palm nuts were more plentiful in the soils of these vegetation types (Mann-Whitney test, p<0.05). Of the five sites containing artifacts, only one recent potsherd dated 466-302 BP was located in dense forest but near a main river. The oldest signs of ceramic and metallurgical activities dated 2160-1407 BP were found in the current open canopy vegetation types. Within the latter, two expansion phases of the oil palm tree E. guineensis were observed: between 2146-1055 BP and 558-347 BP. Conversely, the oldest palaeofire was discovered in the M. mabokeensis dense forest and dated at 5467-5285 BP. Conclusions The dense forests contained less evidence of ancient fires and human settlements. They currently include evergreen and shade-tolerant tree species such as G. dewevrei and M. mabokeensis. The more sustained and repeated fires in the open canopy vegetation types were often associated with ancient human occupation. Today, the light-demanding giant herbaceous species such as Aframomum sp. and M. macrostchyum proliferate in the understorey below a simplified woody component of pioneer species such as M. barteri. The largest expansion phases of the oil palm tree E. guineensis in the southern part would be linked to ancient human occupation associated with larger canopy openings and fire events. The water availability, more evenly distributed near the heavily-irrigated Congo Basin, would also be a discriminating factor. [less ▲]

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See detailMultilocus-based phylogeny and species recognition within the cosmopolitan Peltigera neopolydactyla-dolichorhiza complex
Magain, Nicolas ULg; Miadlikowska, Jolanta; Lutzoni, François et al

Poster (2012, January)

The Peltigera neopolydactyla/dolichorhiza complex is broadly distributed, growing in boreal and temperate regions from northern Norway to southern Chile, as well as in tropical mountains. Observed ... [more ▼]

The Peltigera neopolydactyla/dolichorhiza complex is broadly distributed, growing in boreal and temperate regions from northern Norway to southern Chile, as well as in tropical mountains. Observed morphotype and chemotype variation within this complex suggested the presence of multiple undescribed species. We inferred the phylogeny of Peltigera section Polydactylon with a special focus on the Peltigera neopolydactyla/dolichorhiza complex to determine the full breadth of this species complex, and to assess if taxa from different parts of the worlds but with similar morphological features share a most recent common ancestor. About 525 ITS sequences representing 104 distinct haplotypes were generated for representatives of Peltigera section Polydactylon. We selected a representative of each broadly defined phylotype for which three protein-coding loci: RPB1.1, b-tubulin and EFT2.1 were sequenced. Each of the three protein coding loci provided equivalent or more resolution and support than the ITS locus. The greatest proportion of significantly supported nodes across the tree resulted from β-tubulin alone. Many specimens identified as P. neopolydactyla and P. dolichorhiza are placed outside of this species complex. As currently defined both species represent polyphyletic assemblages of taxa including several potentially undescribed species. Our phylogenies suggest the presence of putatively new species within several complexes across the section. [less ▲]

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See detailAtomic data for lowly ionized Fe-peak species
Bautista, M.A.; Fivet, V.; Ballance, C. et al

Poster (2012, January)

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See detailPersonality modulation of (un)conscious processing: Novelty seeking and performance following supraliminal and subliminal reward cues
Bustin, Gaëlle ULg; Quoidbach, Jordi; Hansenne, Michel ULg et al

Poster (2012, January)

This study provides evidence that personality traits associated with responsiveness to conscious reward cues also influence responsiveness to unconscious reward cues. Participants with low and high levels ... [more ▼]

This study provides evidence that personality traits associated with responsiveness to conscious reward cues also influence responsiveness to unconscious reward cues. Participants with low and high levels of Novelty Seeking (NS) performed updating tasks in which they could either gain 1 euro or 5 cents. Gains were presented either supraliminally or subliminally at the beginning of each trial. Results showed that low NS participants performed better in the high-reward than in the low-reward condition, whereas high NS participants’ performance did not differ between reward conditions. Interestingly, we found that low NS participants performed significantly better when rewards were presented unconsciously, whereas high NS participants’ performance did not differ whether reward cues were presented subliminally or supraliminally. Our findings highlight the necessity to take personality into account in unconscious cognition research. They also suggest that whether implicit and explicit motives have similar or complementary influences might be determined by individual differences. [less ▲]

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See detailEngineering and characterisation of chimeric CXCR4 and CXCR7 chemokine receptors
Szpakowska, Martyna ULg; Fievez, Virginie; Counson, Manuel et al

Poster (2012, January)

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See detailMiR-146a an angiostatic miRNA elevated in peripartum cardiomyopathy
Halkein, Julie ULg; Tabruyn, Sébastien ULg; Haghikia, Arash et al

Poster (2012, January)

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See detailBacillus lipopeptides: Potential new biopesticides against lettuce downy mildew
Deravel, J.; Coutte, F.; Van Hese, N. et al

Poster (2012)

Detailed reference viewed: 39 (2 ULg)
See detailInvestigation of the glucose metabolisme of the chicken embryo by injection of insulin
Franssens, Lies; Koppenol, Astrid; Wang, Yufeng et al

Poster (2012)

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Peer Reviewed
See detailIndicateurs de qualité de prise en charge du cancer du corps de l’utérus : méthodologie et liste pour le projet EFFECT
Bouche, G; WERBROUCK, J; De Jonge, E et al

Poster (2012)

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See detailEffect of water availability on milking frequency and yield of dairy cows milked in pastures by an automatic milking system.
Dufrasne, Isabelle ULg; Robaye, Vincent ULg; Knapp, Emilie ULg et al

Poster (2012)

Nowadays farmers have to manage larger herds but at the same time, want to benefit from a normal social life. The automatic milking system (AMS) can be a solution. Its use can reduce physical labour and ... [more ▼]

Nowadays farmers have to manage larger herds but at the same time, want to benefit from a normal social life. The automatic milking system (AMS) can be a solution. Its use can reduce physical labour and allow flexibility. This technology can result in a reduction in grazing even though grazing is considered as a natural practice of the cows which is appreciated by the consumers. However, the milking frequency is decreased when outdoor grazing rather than an indoor feed systems is combined with automatic milking system (AMS) are combined compared to an indoor system. On pasture, cows tend to visit the AMS by group and enter in close succession. Improved cow traffic would allow increased milking frequency and avoid long waiting before milking. In this aim, effect of water availability in the grazing paddocks on the frequencies of cow visits to was tested. [less ▲]

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See detailNeural correlates of hypokinetic gait in Parkinson’s disease: An fMRI study
Cremers, Julien ULg; Stamatakis, Julien; D'Ostilio, Kevin ULg et al

Poster (2012)

Objective: To investigate the neural correlates of hypokinetic gait in Parkinson’s disease (PD) using functional magnetic resonance imaging (fMRI). Background: Although hypokinetic gait is frequent and ... [more ▼]

Objective: To investigate the neural correlates of hypokinetic gait in Parkinson’s disease (PD) using functional magnetic resonance imaging (fMRI). Background: Although hypokinetic gait is frequent and has a negative impact on quality of life in PD, its underlying mechanisms remain poorly understood. Assuming that the brain regions recruited during real and imagined gait strongly overlap, mental imagery of brisk gait may be a successful approach to study hypokinetic gait in PD. Methods: Fifteen ‘‘on-drugs’’ PD patients (8 males; mean age 5 65.1 6 9.4 years) and fifteen controls matched for age, gender and mental imagery skills were trained to perform video-taped trials of comfortable and brisk gait on a 25 meter-path. The study was organ- ized as a block-design fMRI experiment where subjects were instructed to rehearse themselves performing comfortable and brisk gait and to press a key to indicate when they completed each 25 meter-imagined gait trial. The imagined speed reserve (ISR) defined as the difference between imagined brisk and comfortable gait speeds was measured as a control of behavioral performance. Imaging data processing and analyses were performed using SPM8. The first-level individual contrast images representing the comparison between brisk and comfortable gait were entered as two separate groups (controls vs patients) in an ANOVA with the corresponding ISRs as correlation regressors. Results: Compared with controls, patients showed hypokinetic gait during real gait training as their increase in speed during brisk relatively to comfortable gait was related to an increase in step ca- dence (r50.87; p<0.001) but not in step length (r50.11). ISRs meas- ured during fMRI and their real counterparts measured offline strongly correlated in patients (r50.88; p<0.001) and controls (r50.59; p50.02). Between-group comparison (p<0.001, uncorrected) of fMRI data showed that increasing imagined gait speed was strongly associated with increased activity of the left posterior parietal cortex in controls and with decreased activity of this region in patients. Conclusions: Our findings suggest that hypokinetic gait in PD is related to the impaired functioning of the left posterior parietal cortex. This area may represent a target for therapeutic interventions aimed at alleviating gait disturbances in PD. [less ▲]

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See detailHybrid Lens for Solar Concentration: Optimization of the Multilayer Diffractive Lens
Languy, Fabian ULg; Habraken, Serge ULg

Poster (2012)

Manufacture process degrades the ideal shape of multilayer diffractive lens due to draft angle, half radius tool and slope error. We show some shape improvements using an extended scalar theory.

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See detailcapacité de localisation spatiale des enfants avec Infirmité Motrice Cérébrale (IMC)
Schmetz, Emilie ULg; BARISNIKOV, Kovilkja

Poster (2012)

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See detailDynamique paysagère au Nord-Bénin (Afrique de l'Ouest)
Mama, A; Sinsin, B; Bogaert, Jan ULg et al

Poster (2012)

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See detailMicellar electrokinetic chromatography (MEKC) systems for the separation of mixtures of charged and uncharged compounds
Lamalle, Caroline ULg; Servais, Anne-Catherine ULg; Fradi, Inès et al

Poster (2012)

The migration behaviour of charged and uncharged analytes in MEKC was investigated under different conditions. Effective mobilities – electrophoretic mobilities under the influence of the negatively ... [more ▼]

The migration behaviour of charged and uncharged analytes in MEKC was investigated under different conditions. Effective mobilities – electrophoretic mobilities under the influence of the negatively charged micelles – of cations, anions and neutrals were measured at neutral, basic and acidic pH values (7.5, 11 and 2.2) using background electrolytes containing different sodium dodecyl sulfate (SDS) concentrations (0-90 mM) and acetonitrile proportions (0-75 %, v/v). The SDS concentration and acetonitrile proportion were found to have a tremendous effect on the effective mobilities and the migration order of the tested compounds. Although the SDS micelles interact more strongly with neutrals and cations, the migration of anionic compounds is also affected by the SDS concentration, indicating that hydrophobic interactions can occur between the micelles and these compounds. Since cationic, anionic and neutral solutes exhibit rather different migration behaviours, it is possible to considerably enhance the separation selectivity by properly adjusting the SDS concentration and the acetonitrile proportion in the background electrolyte. These observations confirm the interest of using MEKC not only for the separation of neutral substances but also for the analysis of mixtures of charged compounds. [less ▲]

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See detailLes femmes chefs d’entreprises : Quels sont les facteurs qui influencent l’entrepreneuriat ?
Salman, Noura ULg; El Abboubi, Manal ULg; Henda-Guerfelf, Sana

Poster (2012)

Le présent article vise à dresser un état de l’art de l’entrepreneuriat au Maroc à partir d’une approche par le genre. Plusieurs variables contextuelles et socio-économiques interviennent dans la ... [more ▼]

Le présent article vise à dresser un état de l’art de l’entrepreneuriat au Maroc à partir d’une approche par le genre. Plusieurs variables contextuelles et socio-économiques interviennent dans la compréhension des incitants et des mécanismes de ce phénomène au Maroc et nous souhaitons les mettre en évidence dans cet article. Pour cela, nous questionnons les modalités d’entreprendre par les femmes marocaines et les variables contextuelles, religieuses, socio-économiques qui interviennent dans leurs choix d’investissement entrepreneuriaux… Pour cela nous élaborons une revue de la littérature et nous tenterons d’élaborer un modèle intégrateur des variables explicatives de l’entrepreneuriat féminin au Maroc. [less ▲]

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See detailGlycine receptor activation controls interneuron migration by affecting nuclear translocation and myosin phosphorylation
Avila Macaya, Ariel Salvatore ULg; Nguyen, Laurent ULg

Poster (2012)

Previous studies have described the presence of glycine receptor mRNA during early stages of embryonic cortex development. Here, we have tested the functionality of those receptors in migratory ... [more ▼]

Previous studies have described the presence of glycine receptor mRNA during early stages of embryonic cortex development. Here, we have tested the functionality of those receptors in migratory interneurons and demonstrated their involvement in the control of cell migration. We suggest a mechanism whereby activation of glycine receptors during tangential migration activates voltage gated calcium channels and favors influx of calcium that ultimately affect myosin II activity, a mechanism that fine tune nuclear translocation and thus migration speed. [less ▲]

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See detailOrganisation d’une association villageoise adaptée à la foresterie communautaire au Gabon
Meunier, Q.; Angwé, A.; Boldrini, S. et al

Poster (2012)

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See detailProduction laitière et nombre de traites de vaches laitières en prairie avec un robot: effets des facteurs environnementaux.
Dufrasne, Isabelle ULg; Robaye, Vincent ULg; Knapp, Emilie ULg et al

Poster (2012)

En Belgique, comme dans d'autres pays européens, le recours à la traite robotisée est en augmentation. La majorité des troupeaux traits avec un robot ne pratique pas le pâturage car les exploitants ... [more ▼]

En Belgique, comme dans d'autres pays européens, le recours à la traite robotisée est en augmentation. La majorité des troupeaux traits avec un robot ne pratique pas le pâturage car les exploitants considèrent que cette méthode n'est pas conciliable avec le pâturage. La fragmentation des parcelles est aussi un frein au pâturage. La mise en place d'un robot dans une structure mobile permet d'utiliser le même robot à l'étable en hiver et dans les prairies distantes de l'exploitation en été. L'objectif de cette étude est de tester l'effet de facteurs environnementaux, l'animal, la complémentation, la distance entre le robot et la parcelle, les numéros du jour dans la parcelle et de cycle de rotation sur la production laitière (PL) et le nombre de traites (NT). [less ▲]

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See detailEnzymatic process development for the extraction of ferulic acid from wheat bran
Giet, Jean-Michel ULg; Blecker, Christophe ULg

Poster (2012)

The agro-industries generate each year thousands of tons of by-products, such as cereal bran or sugar beet pulps. For instance, Walloon wheat transformation industry provides annually about 200.000 tons ... [more ▼]

The agro-industries generate each year thousands of tons of by-products, such as cereal bran or sugar beet pulps. For instance, Walloon wheat transformation industry provides annually about 200.000 tons of bran. Most of those by-products are under-valorized as cattle feed. By the use of biorefinery, this biomass may constitute a renewable source for various value-added molecules like dietary fibres, proteins, antioxidants, and more. [less ▲]

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See detailDispersal and regeneration capacity of large-seeded tree species in a forest-savanna mosaic in Western DR Congo
Trolliet, Franck ULg; Huynen, Marie-Claude ULg; Hambuckers, Alain ULg

Poster (2012)

It is widely recognized that the Congo Basin is affected by numerous anthropogenic pressures. A number of studies proved that hunting and forest fragmentation diminish the diversity and abundance of large ... [more ▼]

It is widely recognized that the Congo Basin is affected by numerous anthropogenic pressures. A number of studies proved that hunting and forest fragmentation diminish the diversity and abundance of large vertebrates, more specifically, of large frugivores. The depletion of those animals can directly affect large-seeded tree species as large seeds closely depend on the community of large frugivorous vertebrates for their dispersal. Then, the disruption of animal mediated seed dispersal is thought to deeply impact the plant regeneration capacity. The forest-savanna mosaic situated in Western DR Congo is an ecotone characterized by naturally occurring forest fragments which are also subject to numerous anthropogenic pressures. Those are very likely to disrupt seed dispersal mechanisms and to alter forest regeneration processes. To date, few studies have considered the effect of such an ecosystem on plant-animal interaction dynamics such as seed dispersal, and none have been done in this region. This study will examine if the early stages of regeneration of the large-seeded tree species Anonidium mannii, namely the dispersal capacity and seedling establishment is affected by forest fragment size. We predict that the small fragment size will negatively affect the regeneration capacity of this species. To test this assumption, we will work along a gradient of forest fragment sizes to define the composition of the seed disperser communities. For each disperser assemblage, we will evaluate the quantitative capacity of seed dispersal by combining direct focal observations and camera trapping. A literature review on each disperser species seed retention time and habitat use will allow the computation of the seed dispersal kernels. We will also evaluate the effect of seed ingestion by a presumably important seed disperser, the bonobo, Pan paniscus, on its germination capacity. Seeds will be collected from dung to evaluate the effect of seed ingestion on the rate and velocity of germination. Finally, we will study the predation pressure exerted on dispersed and non-dispersed seeds and seedlings by setting up two sets of seeds below the canopy of parent trees and away from any conspecific trees. One set will be dispersed unprotected to seed predators; another one will be enclosed in a cage and permit seeds to germinate, allowing us to evaluate the herbivores pressure on seedlings. [less ▲]

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See detailEmpreintes de femmes sur les routes de l'Europe : l'architecture des couvents des annonciades célestes
Piront, Julie ULg

Poster (2012)

Poster présentant les principaux objectifs, les sources et les résultats obtenus de la thèse de doctorat intitulée "Empreintes architecturales de femmes sur les routes de l'Europe : étude des couvents des ... [more ▼]

Poster présentant les principaux objectifs, les sources et les résultats obtenus de la thèse de doctorat intitulée "Empreintes architecturales de femmes sur les routes de l'Europe : étude des couvents des annonciades célestes fondés avant 1800", soutenue le 9 décembre 2013. [less ▲]

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See detailThe histone variant macroH2A regulates the commitment of embryonic and adult stem cells
Creppe, Catherine ULg; Cantariño, N; Janich, P et al

Poster (2012)

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Peer Reviewed
See detailIs motor sequence learning impaired in Developmental Coordination Disorder?
Lejeune, Caroline ULg; Catale, Corinne ULg; Schmitz, Xavier ULg et al

Poster (2012)

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic ... [more ▼]

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic performance, the mechanisms underlying this disorder remain largely unknown. One hypothesis that has been proposed is that the poor motor coordination abilities may be attributed to impairments in motor learning and, more specifically, in learning of the correct sequencing of movements (Gheysen et al., 2011). To date, only two studies have directly investigated sequence learning in DCD, but their results are contradictory. The aim of this study was to explore learning of motor sequence in DCD children by means of a modified version of the Serial Reaction Time (SRT) task where the standard keyboard was replaced by a touch screen in order to reduce the impact of the DCD group’s motor difficulties. A total of 34 children (17 with DCD and 17 typically developing (TD) children aged between 6 and 12 years old participated in this study. Results show that DCD children were able to learn the sequence as fast and as accurately as TD children. These findings, showing that children with DCD present the same degree of implicit learning as TD children, differ from those obtained by Gheysen et al. (2011) and so, challenge the motor sequence learning deficit hypothesis. We suggest that differences between studies are not related to an implicit sequence learning deficit per se in children with DCD, but rather to methodological aspects like the response mode used in the studies. [less ▲]

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See detailDevelopment of a regional-scale library of near infrared reflectance soil spectra for alternative assessment of soil characteristics in Southern Belgium
Genot, Valérie ULg; Dardenne, Pierre; Bock, Laurent ULg et al

Poster (2012)

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as ... [more ▼]

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as methodological or technical prospective are realized under scientifically supervision of our research laboratory. In this context, a study was conducted to evaluate the ability of the NIRS to predict some soil properties: CEC, TOC, TN and clay content. The initial models were elaborated upon local PLS regression on set of 1 300 soil samples. The local PLS calibration used allows an accurate prediction of the soil properties and precision of NIRS technique is comparable to reference analytical method [less ▲]

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See detailExtensions of the Background/biResonant decomposition
Denoël, Vincent ULg

Poster (2012)

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See detailIMPACT OF HEAVY METALS ON PHYSIOLOGICAL AND PROTEOMIC RESPONSES OF WILLOWS (SALIX SP.)
Evlard, Aricia ULg; Sergeant, Kjell; Ferrandis, Salvador et al

Poster (2012)

In 2010, around 3,800 sites in Wallonia (Belgium) were identified as potentially contaminated by heavy metals, a result of their past industrial and agricultural activities [1]. The technique of using ... [more ▼]

In 2010, around 3,800 sites in Wallonia (Belgium) were identified as potentially contaminated by heavy metals, a result of their past industrial and agricultural activities [1]. The technique of using plants to remediate contaminated sites (phytoremediation) has been studied for over twenty years. In particular, the use of trees (alder, willow, poplar) has been considered because of their large biomass production [2] [3] [4] [5]. The aim of this study was to identify the potential of local willow ecotypes to grow in the presence of heavy metals using lysimeters filled with dredging sludge. Several willow ecotypes were compared realizing morphological and physiological measurements (chlorophyll fluorescence, electrolyte leakage, carbohydrate content). The plant responses to metal stress were also investigated using a proteomic approach. Heavy metals contents in leaves and stems were analysed. With this study, the potential of these trees to valorise contaminated, abandoned sites in Belgium was evaluated. [1] Cellule Etat de l'environnement wallon (2010). Tableau de bord de l'environnement wallon. SPW-DGARNE-DEMNA-DEE. [2] Dickinson N. M. (2000). Strategies for sustainable woodland on contaminated soils. Chemosphere 41(1-2): 259-263. [3] Meers E., Lamsal S., Vervaeke P., Hopgood M., Lust N. and Tack F. M. G. (2005). Availability of heavy metals for uptake by Salix viminalis on a moderately contaminated dredged sediment disposal site. Environ Pollut 137(2): 354-364. [4] Meers E., Vandecasteele B., Ruttens A., Vangronsveld J. and Tack F. M. G. (2007). Potential of five willow species (Salix spp.) for phytoextraction of heavy metals. Environ Exp Bot 60(1): 57-68. [5] Rosselli W., Keller C. and Boschi K. (2003). Phytoextraction capacity of trees growing on a metal contaminated soil. Plant Soil 256(2): 265-272. [less ▲]

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See detailAssessing the role of porosity in composite electrodes through model thin film electrode studies
Krins, Natacha ULg; Shukla, Alpesh K.; Milliron, Delia J. et al

Poster (2012)

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See detailDynamique des paysages forestiers et savanicoles du Sud et du Nord-Est du Burundi
Havyarimana, F; Bigendako, M J; Bogaert, Jan ULg et al

Poster (2012)

Detailed reference viewed: 32 (6 ULg)
See detailPrecisely controlled mesoporous films to assess the role of architecture in Li‐ion batteries
Krins, Natacha ULg; Buonsanti, Raffaella; Shukla, Alpesh K. et al

Poster (2012)

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See detailEarly detection of alien plants in xeric Natura 2000 sites in Southern Belgium
Monty, Arnaud ULg; Frisson, Gwenn; Mahy, Grégory ULg

Poster (2012)

The Natura 2000 network consists of sites designated by the member States of the European Union, under the Habitats and Birds Directives. Setting up that network is one of the biggest challenge in nature ... [more ▼]

The Natura 2000 network consists of sites designated by the member States of the European Union, under the Habitats and Birds Directives. Setting up that network is one of the biggest challenge in nature conservation in Europe, since habitats and species for which Natura 2000 sites are designated must be maintained in a “favorable conservation status”. Little is known so far, however, about how Natura 2000 sites are invaded by exotics species. Xeric habitats of high biological value included in the Natura 2000 network are among the most species-rich in Southern Belgium. They include calcareous grasslands, sandy meadows, dry heathlands, boxwood stands, siliceous rocks and calcareous rocks. We randomly sampled 15% of sites in each of these six categories (with a minimum of five sites per category) , with a total of 86 sites out of 470 existing sites. In each site, we recorded the presence/absence of 63 alien plants know to develop in xeric habitats (species list based on Verloove (2006) and expert’s personnal observations.), and estimated species cover. 25 naturalized alien plant species were observed in xeric habitats of the Natura 2000 network in Southern Belgium. Generally, alien species populations were still limited. [less ▲]

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See detailAssessing the role of porosity in composite electrodes through model thin film electrode studies
Krins, Natacha ULg; Shukla, Alpesh K.; Milliron, Delia J. et al

Poster (2012)

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See detailThe tomato leafminer reproduces without a mate: New case of parthenogenesis in Lepidoptera
Caparros Megido, Rudy ULg; Haubruge, Eric ULg; Verheggen, François ULg

Poster (2012)

The tomato leafminer, Tuta absoluta (Lepidoptera: Gelechiidae), originates from South America and is now considered to be one of the most damaging invasive pests of tomatoes in the Mediterranean Basin ... [more ▼]

The tomato leafminer, Tuta absoluta (Lepidoptera: Gelechiidae), originates from South America and is now considered to be one of the most damaging invasive pests of tomatoes in the Mediterranean Basin countries of Europe and North Africa. The preventing pest mating control methods include: (1) the use of synthetic pheromones for male attraction and annihilation inside insecticide-contain- ing traps; (2) mating disruption by saturating the atmosphere with sex pheromones which alter the ability of males to locate females; and (3) massive applications of sterile males to alter the overall reproductive success of the pest popula- tion. However, all these methods achieve only a poor success rate in controlling T. absoluta populations under greenhouse conditions. Sex pheromone management and sterile insect techniques are both based on an important biological trait: the insect must breed through sexual reproduction. Here, we report for the first time laboratory evidence of deuterotokous parthenogenesis, an asexual reproduction where both males and females are produced from unfertilized eggs. [less ▲]

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See detailThe sheepshead minnow Cyprinodon variegatus as a marine vertebrate model for investigating endocrine disrupting effects of triclosan
Schnitzler, Joseph ULg; Gauthray, Ghislain ULg; Silvestre, Frédéric et al

Poster (2012)

Zebrafish (Danio rerio) has been a prominent model in toxicology. This freshwater species present many advantages both in identifying endpoints of toxicity and in elucidating mechanisms of toxicity ... [more ▼]

Zebrafish (Danio rerio) has been a prominent model in toxicology. This freshwater species present many advantages both in identifying endpoints of toxicity and in elucidating mechanisms of toxicity. However, marine toxicologists lack such omnipotent model displaying similar advantages to zebrafish: small size, rapid breeding, and easy maintenance. We propose here the use of the sheepshead minnow Cyprinodon variegatus to define thyroid-disrupting effects of triclosan during pre-hatching development. Three females and two males were placed in each of the three breeding chambers designed for this experiment. More than 300 eggs were collected over three days and maintained in seawater with triclosan concentrations at 0, 100 ng.L-1, and 100 µg.L-1. Exposure of larvae to triclosan lasted until hatching. After hatching (six days post-spawning), 5 larvae per condition were placed in Bouin’s fixative for brain and thyroid histology. Length and body mass were measured. The body was frozen at -80oC to determine muscle thyroid hormone levels (T3 and T4), using radio-immunoassay techniques. Hatching success, in vivo observations, gross observation, thyroid hormone levels, histology will be determined and discussed in the framework of whether or not triclosan may alter thyroid metabolism during pre-hatching period of the sheepshead minnow. [less ▲]

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See detailMALDI In-Source Decay for High Throughput sequencing of peptide animal toxins
Quinton, Loïc ULg; Degueldre, Michel ULg; Gilles, Nicolas et al

Poster (2012)

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See detailA descriptive study of physico-chemical characteristics of Posidonia oceanica litter accumulation
Lepoint, Gilles ULg; Borges, Alberto ULg; Darchambeau, François ULg et al

Poster (2012)

The Mediterranean seagrass Posidonia oceanica meadow losses every fall the major part of its leaf biomass after senescing. These phytodetritus may decay within the meadow, be buried or be exported to ... [more ▼]

The Mediterranean seagrass Posidonia oceanica meadow losses every fall the major part of its leaf biomass after senescing. These phytodetritus may decay within the meadow, be buried or be exported to other habitats. They form large litter accumulations, notably on shallow water sand patches. Such accumulation host many organisms which participate to the degradation of this material. In a first step to understand the dynamics of these accumulations and of their associated biota, we have characterised their physico-chemical heterogeneity at different seasons. We measured the dissolved oxygen, nutrients and sulphide concentrations in interstitial waters from litter accumulations varying regarding their phytodetritus composition, fragmentation level and thickness. Results show that oxygen conditions were highly variable depending on litter thickness but also on local hydrodynamics. Anoxic conditions and presence of sulphide were sometimes measured, particularly in very thick litter or in degraded litter at the end of summer. Colonies of sulphur-oxidising bacteria were observed. Litter accumulations were also often enriched in ammonium and, sometimes, in dissolved phosphorus. It is not clear whether this results from the litter degradation within the accumulation or whether this is a consequence of a barrier effect between sediment and water column. Nevertheless, this makes litter accumulations particularly attractive for micro-phytobenthic producers. Litter accumulations appear as key habitats both to understand the dead-face of seagrass dynamics and its consequence for C cycle in coastal areas and to study the consequence of hypoxia on biodiversity in a natural context. [less ▲]

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See detailPerformance, limitations and utility of cystatin C as an endogenous GFR marker in renal transplantation
Masson, I; Maillard, N; Tack, I et al

Poster (2012)

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See detailEtude des feux d'aménagement en zone tropicale semi-aride: cas du Parc Régional du W du Niger
Diouf, A; Barbier, N; Saadou, M et al

Poster (2012)

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See detailPrevalence of naturally occuring cartilage defects in the ovine stifle
Pierson, Audrey ULg; Muylkens, Benoît ULg; Hontoir, Fanny et al

Poster (2012)

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See detailAnthropisation et effets de lisière: impacts sur la diversité des rongeurs dans la réserve forestière de Masako (Kisangani, RDC)
Iyongo, L; Visser, M; Verheyen, E et al

Poster (2012)

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See detailImmature Metaplastic CIN1: A Variant with Intense P16 Staining and Low Proliferative Index
Parra-Herran, Christopher P.; Lane, Bruno; Hirsch, MS et al

Poster (2012)

Background: Epithelial maturation traditionally is used to grade CIN in histologic sections. However, in some an immature epithelium displays atypia that is low in proportion to the level of epithelial ... [more ▼]

Background: Epithelial maturation traditionally is used to grade CIN in histologic sections. However, in some an immature epithelium displays atypia that is low in proportion to the level of epithelial maturity. Although MIB1 and p16ink4 are helpul in establishing the diagnosis of CIN in this setting, classifying such lesions can be problematic. We analyzed a subset of these atypias, and this study summarizes a correlation between morphology and p16 and MIB1 immunostaining. Design: Immature metaplastic atypias were divided into those with putative low (uniform nuclear spacing, minimal nuclear variation, absent or mild nuclear hyperchromasia) and high-grade (irregular nuclear spacing, heterogeneous nuclear morphology, increased nuclear chromasia) features. Immunohistochemical staining for p16 was classifi ed as patchy or diffuse (horizontally) and MIB-1 proliferation index was recorded as percentage of positive cells and location of elevated proliferative index as a function of basal, middle and superfi cial third of the epithelium. Staining patterns and histologic grade were correlated. Results: Forty-three cases were classified without knowledge of the immunohistochemistry. Immature metaplastic low grade CINs exhibited strong and diffuse staining for p16 and but unlike High grade CINs, the proliferating (MIB1+) cells were concentrated in the more basal 1-2 thirds of the epithelium and the proliferative index was less than 30%. Variable columnar differentiation was observed in some, with strong staining of both the columnar and squamous cells by p16. Conclusions: A distinct subset of immature CINs displays a uniform cell population and based on both cytology and proliferative index, warrants classifi cation as low grade CIN (CIN1). p16 immunohistochemistry, although helpful in the recognition of these lesions, will not distinguish them from higher grade CIN (CIN2/3). Attention to regularity in nuclear morphology with absence of noticeable differences in cell size and shape, combined with MIB1 staining, is helpful,. The presence of columnar differentiation, which also stains positive for p16 is consistent with bidirectional differentiation in the transformation zone epithelium. Further studies of this entity are warranted to precisely determine its biologic behavior. [less ▲]

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See detailEuropean inter-institutional impact study of MammaPrint
CUSUMANO, Giuseppe ULg; Generali, D; Ciruelos, E et al

Poster (2012)

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See detailTypage des souches de Norovirus circulant dans les populations symptomatiques et asymptomatiques au Burkina Faso
HUYNEN, Pascale ULg; Mauroy, Axel ULg; MARTIN, Caroline et al

Poster (2012)

Appartenant à la famille des Caliciviridae, genre Norovirus, les norovirus (NoV) sont des virus non enveloppés dont le génome est composé d’un ARN monocaténaire de polarité positive ... [more ▼]

Appartenant à la famille des Caliciviridae, genre Norovirus, les norovirus (NoV) sont des virus non enveloppés dont le génome est composé d’un ARN monocaténaire de polarité positive d’approximativement 7,5 kb. Les NoV infectent l’homme chez qui ils représentent au niveaumondial un agent majeur de gastroentérites épidémiques, d’origine souvent alimentaire mais aussi sporadique, et ce, toutes classes d'âges confondues. Les souches humaines sont classées génétiquement dans différents génotypes au sein de trois des cinq génogroupes, nommés (G) I, II et IV, composant le genre Norovirus. La voie de transmission des NoV est féco-orale. Les NoV sont très résistants dans l’environnement et la dose infectieuse est faible. Dans la population humaine, une grande diversité de souches appartenant principalement aux G I et II co-circulent. Parmi ces souches, le génotype Lordsdale (GII-4) est prédominant dans les épidémies actuelles, notamment lorsqu'une transmission de personne à personne est incriminée, alors que les souches du G I semblent plus fréquemment rapportées au cours des épidémies d’origine environnementale, comme celles liées à la consommation de fruits de mer. Si de nombreuses études d'épidémiologie moléculaire concernant ces virus ont été réalisées dans les pays industrialisés, les données sont par contre manquantes ou ténues pour bien des pays non industrialisés, et en particulier africains. Au cours d'une étude épidémiologique réalisée à Bobo Dioulasso au Burkina Faso et portant sur la prévalence des NoV dans les échantillons de selles de patients présentant ou non des symptômes de gastro-entérite, les souches détectées ont été quantifiées, leur génogroupe a été déterminé et pour certaines d'entre elles le génotype a été précisé. Quatre cent cinquante trois patients ont été prélevés, dont 319 présentant des symptômes diarrhéiques et 134 sujets témoins ne présentant pas de symptomatologie digestive. La détection des NoV et la quantification des charges virales excrétées ont été effectuées sur tous les échantillons par RT-PCR en temps réel permettant de discriminer les souches appartenant aux G I ou II. Une RT-PCR conventionnelle visant les régions de la polymérase (ORF1 du virus) ou de la capside (ORF2) a ensuite été réalisée sur une partie des échantillons détectés positifs en vue du séquençage de ces régions. Les relations phylogénétiques des souches circulant dans la population du Burkina Faso aux souches de référence ont aussi été inférées. Les résultats de RT-PCR en temps réel ont permis de mettre en évidence que les prévalences apparentes de l'infection par les NoV sont similaires dans les populations symptomatique et asymptomatique : une détection moléculaire de NoV chez 67 patients présentant de la diarrhée (21,0 %) et chez 31 des sujets témoins (23,1 %) a pu être observée. Les génotypes circulant détectés sont très variés dans les deux génogroupes, avec une proportion assez surprenante de NoV appartenant au G I. Université polytechnique de Bobo-Dioulasso, Institut supérieur des Sciences de la Santé (INSSA), Bobo-Dioulasso, Burkina Faso. Cette étude a permis de préciser l'épidémiologie moléculaire des souches de NoV circulant dans un pays représentatif de l'Afrique de l'Ouest. Elle a également montré que des individus asymptomatiques pourraient jouer un rôle assez important de réservoir du virus. Elle souligne enfin que, malgré le fait que les souches GII, et en particulier celles de génotype GII.4, soient à l'heure actuelle rapportées majoritairement au niveau mondial, les souches G I doivent être excrétées en égale proportion dans l'environnement. L'origine épidémiologique de la différence entre les prévalences apparentes des infections par les souches de GI et de GII, bien que partiellement expliquée par les différences de sensibilité génétique et d'immunité de population, reste donc à élucider. Remerciements: à la fondation A. Seghers, au Centre de Coopération au Développement de l'Université de Liège, à R. Boreux (assistance technique), aux membres du laboratoire du CMA de Dô et aux agents de santé de Bobo-Dioulasso (Burkina-Faso). [less ▲]

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See detailBlue... is a bad sign
LORCE, Aurélie ULg; BODSON, Lucien ULg; Ghuysen, Alexandre ULg et al

Poster (2012)

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See detailRégénération des communautés de campos rupestres, pelouses tropicales d’altitude, après un feu (Brésil)
Hernandez, Pauline; Le Stradic, Soizig ULg; Buisson, Elise et al

Poster (2012)

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See detailLe débit de filtration glomérulaire est-il un déterminant de la concentration plasmatique du NGAL aux soins intensifs ?
DELANAYE, Pierre ULg; Claisse, Guillaume; Mehdi, Manoli et al

Poster (2012)

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See detailMUC4 is not related to susceptibility in piglets to enterotoxigenic Escherichia coli-F4.
Schroyen, Martine ULg; Stinckens, Anneleen; Verhelst, Roderick et al

Poster (2012)

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See detailKINETICS OF QUINALPHOS RESIDUES ELIMINATION IN WATER AND FISH TISSUES FROM TANK CULTURED SILVER BARB (Barbonymus gonionotus)
Nguyen Quoc, Thinh; Tran Minh, Phu; Do Thi Thanh, Huong et al

Poster (2012)

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See detailAnalyse sensorielle et biochimique du Tilapia du Nil (Oreochromis niloticus) conservé à température ambiante (30°C) et à 4°C
Boudjlal Dergal, Nadir; Ali-Mehidi, Smaïl; Douny, Caroline ULg et al

Poster (2012)

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See detailThe presentation of skull base osteoid osteoma with acute life threatening events. A case series.
Mallick, A; Mirza, AH; POIRRIER, Anne-Lise ULg et al

Poster (2012)

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See detailConstruction and pre-validation of a cognitive ergonomics questionnaire for work holding in multiple sclerosis patients : The QUIPSEP
DELRUE, Gaël ULg; MONISSE, Aurélie; Blavier, Adelaïde ULg et al

Poster (2012)

We describe how we build and pre-validate a cognitive ergonomics questionnaire for multiple sclerosis patients actually employed, the QUIPSEP. This questionnaire must help us better manage our patients ... [more ▼]

We describe how we build and pre-validate a cognitive ergonomics questionnaire for multiple sclerosis patients actually employed, the QUIPSEP. This questionnaire must help us better manage our patients and thei potentiel difficulties in work situation from a cognitive ergonomic point of view. [less ▲]

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See detailPollen contents : what matters for polylectic bees ?
Moerman, Romain; Vanderplanck, Maryse ULg

Poster (2012)

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See detailRééducation attentionnelle chez l’enfant avec Trouble Déficitaire de l’Attention (TDA) : Analyse de deux cas.
Turine, Hélène ULg; Lejeune, Caroline ULg; Catale, Corinne ULg

Poster (2012)

L’objectif de cette étude est d’évaluer l’efficacité d’une prise en charge cognitive basée sur des exercices spécifiques d’entraînement de l’attention (informatisés et papier-crayon) sur les performances ... [more ▼]

L’objectif de cette étude est d’évaluer l’efficacité d’une prise en charge cognitive basée sur des exercices spécifiques d’entraînement de l’attention (informatisés et papier-crayon) sur les performances cognitives et le comportement de deux enfants TDA. L’impact d’une prise en charge attentionnelle chez des enfants avec TDA reste, à ce jour, mal connu même si quelques rares travaux suggèrent un bénéfice de ce type d’intervention sur des mesures attentionnelles et comportementales chez ces enfants (e.g., Noël et al., 2007). Deux enfants TDA avec troubles attentionnels objectivés par un examen neuropsychologique ont bénéficié de 40 séances de rééducation, lesquelles proposaient des exercices spécifiques aux difficultés de ces deux enfants (inhibition, attention soutenue et sélective et flexibilité). Chaque enfant était apparié à quatre enfants de contrôle. Les analyses de comparaison pré et post-rééducation montrent une amélioration des performances pour le cas 1 au niveau de différents composants attentionnels (inhibition, attention soutenue, attention sélective et flexibilité) ainsi qu’au niveau comportemental (p<.05) qui se maintient au-delà de 6 mois après la rééducation. En revanche, les analyses réalisées pour le cas 2 ne montrent aucune amélioration mais plaident en faveur d’un changement de stratégie cognitive (amélioration de la performance qualitative au détriment de la vitesse de réalisation). Cette étude confirme l’intérêt d’une prise en charge attentionnelle chez des enfants avec TDA et souligne l’importance de différents paramètres (variabilité interindividuelle, âge, motivation, profil attentionnel,…) dans le succès d’une telle rééducation. [less ▲]

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See detailDevelopment of a non-lethal sampling method to monitor immune response and disease progression in salmonid fish
Collet, Bertrand; Secombes, Chris J; Mira Monte, Milena ULg et al

Poster (2012)

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See detailChemical constraint of solitary bees in host-plant specialization
Vanderplanck, Maryse ULg; Pinczewski, Azzédine; Wathelet, Bernard ULg et al

Poster (2012)

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See detailAlternative splicing of the elastin gene in horses affected with chronic progressive lymphedema.
Dekeyser, Kirsten; Schroyen, Martine ULg; Oosterlinck, Maarten et al

Poster (2012)

Detailed reference viewed: 7 (0 ULg)
See detailSNP’s in different genes involved in fat storage are not associated with boar taint in Belgian pigs.
Schroyen, Martine ULg; Janssens, Steven; Stinckens, Anneleen et al

Poster (2012)

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See detailDating methods applied to building archaeology
Blain, Sophie ULg; Guibert, Pierre; Hoffsummer, Patrick ULg et al

Poster (2012)

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See detailIs Sino-Nasal Outcome Test 22 (SNOT-22) an Appropriate Outcome Measure for Septorhinoplasty?
Goodson, Alexandre; POIRRIER, Anne-Lise ULg; Ahluwalia, Suki et al

Poster (2012)

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See detailRegion- and context-specific rapid changes in brain aromatase activity following social interactions
de Bournonville, Catherine ULg; Dickens, Molly J; Ball, Gregory F et al

Poster (2012)

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See detailStable isotope composition spatial variability at microhabitat scale of macrofauna inhabiting a tropical freshwater stream (Pérou River, Guadeloupe)
Lepoint, Gilles ULg; Marichal, Nicolas; Troupin, Charles ULg et al

Poster (2012)

The spatial variability of isotopic (C and N) composition of freshwater fauna was assessed in a small and pristine tropical stream (Pérou River, Guadeloupe). In order to assess this variability, a section ... [more ▼]

The spatial variability of isotopic (C and N) composition of freshwater fauna was assessed in a small and pristine tropical stream (Pérou River, Guadeloupe). In order to assess this variability, a section of 80 m was mapped and divided in quadrate (n= 132). Microhabitats (i.e. depth, hydrodynamic facies, presence of litter) were defined for each quadrate. Electric fishing was performed in each quadrate and individual isotopic measurements using EA-IRMS were done using abdominal muscles for crustaceans and lateral muscles for fishes. Isomap was generated for each species. Potential food sources (green ripisylve, macrophytodetritus, epilithic biofilm and deriving organic material) were sampled and analyzed for their isotopic composition. SIAR mixing model was applied to try to delineate isotopic and trophic variability in relation to microhabitat in this river section. Nine species were recorded belonging to four decapod families (n= 8 species) and one fish family (n= 1 species). This fauna, dominated by crustaceans, is typical of high and medium elevations of Caribbean rivers in relatively pristine area. In these turbulent biotopes, species encountered are strongly linked to the hydrological characteristics of their microhabitat and have well defined preferenda. Isotopic compositions of ripisylve material, of deriving matter and of autochtonous biofilm were significantly different for both 13C values and 15N values, allowing to discriminate their respective contributions to consumer diet. Epilithic and epiphytic biofilm appeared to contribute significantly to these diets, but most of the species showed evidence for litter material contribution too. Species repartition and their respective diet were evident at microhabitat scale and strongly related to hydrological regime. [less ▲]

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See detailPropofol induced unconsciousness: fMRI total neuronal activity and resting state networks.
Gantner, Ithabi; Guldenmund, Justus Pieter ULg; Gómez, Francisco et al

Poster (2012)

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See detailCKD-EPI GFR estimating equations in kidney transplantation: which added value for the new cystatin C based equations?
Masson, I; Maillard, N; Kamar, K et al

Poster (2012)

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See detailOncogenic human papillomavirus could directly interact with natural killer cells
Renoux, V; Bastin, R; Langers, I et al

Poster (2012)

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