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See detailEcological fitness of plant-beneficial Bacillus subtilis strains in soil: influence of rhizosphere specific parameters on surfactin synthesis.
Nihorimbere, V.; Fickers, P.; Thonart, Philippe ULg et al

in Journal of Plant Pathology [=JPP] (2008), 90

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See detailEcological impact of habitat loss on African landscapes and diversity
Vranken, Isabelle ULg; Djibu Kabulu, J P; Munyemba Kankumbi, F et al

in Daniels, J A (Ed.) Advances in environmental research, volume 14 (2011)

Detailed reference viewed: 79 (28 ULg)
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See detailEcological Impacts of Invasive Plant Species
Vanderhoeven, Sonia ULg

Conference (2007)

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See detailEcological modeling and paedomorphosis: a study case in Montenegrin newts
Denoël, Mathieu ULg; Ficetola, Gentile; Cirovic, Rusa et al

Poster (2009)

Detailed reference viewed: 21 (1 ULg)
See detailEcological modeling of the upper layers of Lake Kivu: a progress report
Leblanc, Christophe; Darchambeau, François ULg; Descy, Jean-Pierre et al

Conference (2009, January 19)

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See detailEcological network and local authorities - sociological instrument
Mougenot, Catherine ULg; Roussel, Laurence

in Nature and environment (2002), (126), 37

Ever closer links have been forged between caring for nature on the one hand and human activities on the other. In recent years there has been a shift from an interest in reserve-based nature, which ... [more ▼]

Ever closer links have been forged between caring for nature on the one hand and human activities on the other. In recent years there has been a shift from an interest in reserve-based nature, which excluded man and human activities, to an increasingly powerful nature-culture relationship. Nature protection became nature conservation and then nature development with the integration of socio-economic and cultural aspects. Within the framework of the setting-up of the pan-european ecological network, these sociological aspects have a great importance for establishing an ecological network where the scientific aspects of biodiversity protection must co-exist with nature management and development. [less ▲]

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See detailEcological or recalled assessments in chronic musculoskeletal pain? A comparative study of prospective and recalled pain assessments in low back pain and lower limb painful osteoarthritis.
Perrot, Serge; Marty, Marc; Legout, Valerie et al

in Pain Medicine : The Official Journal of the American Academy of Pain Medicine (2011), 12(3), 427-36

OBJECTIVES: The objective of this study was to compare ecological and recalled pain intensity assessments over 29 days in hip and knee osteoarthritis (O) and chronic low back pain (L). PATIENTS AND ... [more ▼]

OBJECTIVES: The objective of this study was to compare ecological and recalled pain intensity assessments over 29 days in hip and knee osteoarthritis (O) and chronic low back pain (L). PATIENTS AND METHODS: Rheumatologists were asked to enroll patients with O and L, with pain intensity above 40 mm, in a prospective study for 29 days. Pain intensity was assessed with physicians on Days 1 and 29, and ecologically, over the intervening 28-day period, by random phone calls. RESULTS: We carried out correlation analyses for 353 (159 O, 194 L) patients: Overall recalled daily pain was strongly correlated with calculated 3-day mean pain assessments (r=0.96 [O]; 0.93 [L]) and evening pain (r=0.96 [O], 0.90 [L]). Correlations between ecological and recalled measures were stronger for recall over the last 7 days than for recall over the last 28 days in osteoarthritis patients (r=0.78, r=0.63), but were similar for both recall periods in low back pain patients (r=0.70, r=0.72). Correlations between assessments for the last 7 and 28 days were stronger for ecological (r=0.88 [O], 0.91 [L]) than for clinical (r=0.77 [O]; 0.86 [L]) assessments. After adjustment for current pain intensity, correlations remained significant for ecological assessments, but not for clinical assessments. Recalled pain assessments were more accurate when made after 24 hours (r=0.71 [O]; 0.70 [L]) than when made after 48 hours (r=0.63 [O]; 0.61 [L]). CONCLUSIONS: For both low back pain and osteoarthritis, overall daily pain recall is a reliable measurement correlated with daily ecological measurements, whereas a rapid decrease in recall occurs after 48 hours. The most reliable period for pain recall was 7 days, but the results obtained were influenced by current pain. [less ▲]

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See detailEcological requirements for black grouse. A case study in the belgian Hautes-Fagnes.
Keulen, Christine; Pieper, Y.; Doyen, A. et al

Conference (2003, September 08)

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See detailEcological requirements for black grouse. A case study in the belgian Hautes-Fagnes.
Keulen, C.; Pieper, Y.; Doyen, A. et al

in Silvia (2003), 39

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See detailEcological review of black-grass (Alopecurus myosuroides Huds.) propagation abilities in relationship with herbicide resistance
Maréchal, Pierre-Yves ULg; Henriet, François; Vancutsem, Françoise ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(1),

Alopecurus myosuroides Huds. (vulpin des champs) a toujours été une préoccupation majeure pour les céréaliculteurs et le développement de la résistance aux herbicides n’améliore pas la situation. Cet ... [more ▼]

Alopecurus myosuroides Huds. (vulpin des champs) a toujours été une préoccupation majeure pour les céréaliculteurs et le développement de la résistance aux herbicides n’améliore pas la situation. Cet article de synthèse résume les différents critères impliqués dans les modèles de dispersion d’individus de vulpin des champs au sein d’un champ ou d’une population sensible. Pour ce faire, le cycle complet du vulpin est décrit de la semence à la semence. Depuis le développement végétatif précoce jusqu’à la chute de la graine, chaque étape est décrite en prenant en compte comment la résistance aux herbicides peut influencer ou exercer un impact différent par rapport à des plantes sensibles. [less ▲]

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See detailThe ecological study of an unknown non-timber forest product (NTFP): the African walnut (Coula edulis Baill.)
Moupela, Christian ULg; Vermeulen, Cédric ULg; Lebailly, Philippe ULg et al

Conference (2011, November 15)

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux ... [more ▼]

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux de son écologie, dont le potentiel de production, la dispersion et la prédation des fruits, demeurent inconnus, ce qui pourrait constituer un frein à sa valorisation. L’étude s’est déroulée au Gabon et s’est attachée à quantifier la production fruitière de l’espèce et à identifier les prédateurs et disperseurs des fruits. Trente-neuf collecteurs circulaires ont été installés sous les houppiers, les données récoltées (nombre et masse des fruits) étant ensuite mises en relation avec le diamètre. Par ailleurs, sept semenciers ont fait l’objet d’observations indirectes grâce à un dispositif de caméras-pièges. Les premières fructifications apparaissent sur les semenciers à partir de 12,3 cm de diamètre. Elle se produit de janvier à avril. Les quantités de fruits sont corrélées positivement au diamètre (r² = 0,493 ; p = 0,001). Dix espèces animales ont été observées aux pieds des arbres en fruits, leur rôle dans la dynamique de population de l’espèce est potentiellement important. [less ▲]

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See detailThe ecological study of an unknown non-timber forest product (NTFP) : The African walnut (Coula edulis Baill.)
Moupela, Christian; Vermeulen, Cédric ULg; Brostaux, Yves ULg et al

Conference (2011, November)

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux ... [more ▼]

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux de son écologie, dont le potentiel de production et la prédation des fruits, demeurent inconnus, ce qui peut constituer un frein à sa valorisation. L’étude s’est déroulée au Gabon et s’est attachée à quantifier la production fruitière de l’espèce et à identifier les prédateurs potentiels des fruits. Trente-neuf collecteurs circulaires ont été installés sous les houppiers, les données récoltées (nombre et masse des fruits) étant ensuite mises en relation avec le diamètre. Par ailleurs, sept semenciers ont fait l’objet d’observations indirectes grâce à un dispositif de caméras-pièges. Le diamètre minimum de fertilité est de 12,3 cm, tandis que 23 cm dhp constitue pour l’espèce le diamètre effectif de fructification. Celle-ci se produit de décembre à avril. Les quantités de fruits sont corrélées positivement au diamètre. Dix espèces animales ont été observées aux pieds des arbres en fruits, leur rôle dans la dynamique de l’espèce est potentiellement important. [less ▲]

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See detailAn ecological study of Electra posidoniae Gautier, 1954 (Cheilostomata, Anasca), a bryozoan epiphyte solely found on the seagrass Posidonia oceanica (L.) Delile, 1813
Lepoint, Gilles ULg; Mouchette, Olivier; Pelaprat, Corine et al

in Belgian Journal of Zoology (in press)

The bryozoan Electra posidoniae Gautier is found solely on the leaves of the Neptune grass Posidonia oceanica (L.) Delile, dominating the leaf epifauna of this seagrass. Epiphytes of marine angiosperms ... [more ▼]

The bryozoan Electra posidoniae Gautier is found solely on the leaves of the Neptune grass Posidonia oceanica (L.) Delile, dominating the leaf epifauna of this seagrass. Epiphytes of marine angiosperms (or seagrasses) often play an important role in ecosystem functioning, for example as food web suppliers. As dysfunction of epiphytic compartment is often implied in human-induced seagrass decline, it is important to understand the dynamics and life traits of this community in pristine areas. This study involved the monthly assessment of colonization dynamics, biomass seasonality and diet composition through stable isotopes measurements of E. posidoniae at a depth of 10 m in the Revellata Bay (Corsica, Mediterranean Sea). Ancestrulae (i.e. colony founders) appeared towards the end of winter and were very selective in their settlement position along the P. oceanica leaves. A maximum of 100,000 colonies per square meter was recorded. E. posidoniae colonies dominated the epiphytic community biomass in early spring, and were over-covered by epiphytic algae in June. Food shortage could be also involved in this decrease. Although stable isotope ratios of C, N and S showed that this suspension feeder mainly relies on the water column productivity for its food, other food sources such as re-suspended epiphytic diatoms could be important in late spring (i.e. after the phytoplanktonic bloom). Additionally, a contribution of seagrass phytodetritus to the diet of this species cannot be excluded. The species was almost absent in winter, raising the question of its recruitment in spring. This study confirms the quantitative importance of this species in the seagrass meadow and explores its role in the relationship between the water column and this seagrass ecosystem. [less ▲]

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See detailEcological thresholds and estimates of breaking points in newt populations: a useful tool to categorise habitat use and apply conservation measures
Denoël, Mathieu ULg; Ficetola, Gentile

Poster (2007)

Ecological thresholds are defined as points at which a rapid change occurs from one ecological condition to another. Their determination in species–habitat relationships has important implications because ... [more ▼]

Ecological thresholds are defined as points at which a rapid change occurs from one ecological condition to another. Their determination in species–habitat relationships has important implications because they allow to understand ecological requirements of species and to provide efficient conservation measures. However, there is a lack of concordance across studies and this method was not yet applied to newts. In this study, we sampled 371 ponds to gather occurrence data on the palmate newt Triturus heveticus and the Alpine newt Triturus alpestris. We tested for the existence of significant thresholds for three variables: distance to forest, forest and crop covers. We found significant thresholds for both landscape configuration and composition, with relationships between distance to forest and occurrence of Triturus alpestris and T. helveticus, and forest and crop cover and T. helveticus. Both species require breeding ponds within a given distance from the forest, but T. helveticus is more dependent on forest availability than T. alpestris: its ecological threshold is located at lower distance from forest edge, and requires also higher values of forest cover. Crops have a negative influence on palmate newt distribution with a significant breaking point, but not for T. alpestris in the studied area. These results indicate that thresholds can be a useful concept from which tools may be developed. They are particularly pertinent to focus conservation effort for threatened species and their habitats as quantitative measures of the most required habitats for species can be obtained from statistically determined breaking points [less ▲]

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See detailEcological thresholds: an assessment of methods to identify abrupt changes in species-habitat relationships
Ficetola, Gentile Francesco; Denoël, Mathieu ULg

in Ecography (2009), 32(6), 1075-1084

Habitat thresholds are usually defined as "points of abrupt change" in the species–habitat relationships. Habitat thresholds can be a key tool for understanding species requirements, and provide an ... [more ▼]

Habitat thresholds are usually defined as "points of abrupt change" in the species–habitat relationships. Habitat thresholds can be a key tool for understanding species requirements, and provide an objective definition of conservation targets, by identifying when habitat loss leads to a rapid loss of species, and the minimum amount of habitat necessary for species persistence. However, a large variety of statistical methods have been used to analyse them. In this context, we reviewed these methods and, using simulated data sets, we tested the main models to compare their performance on the identification of thresholds. We show that researchers use very different analytical tools, corresponding to different operational definitions of habitat thresholds, which can considerably affect their detection. Piecewise regression and generalized additive models allow both the distinction between linear and nonlinear dynamics, and the correct identification of break point position. In contrast, other methods such as logistic regression fail because they may incorrectly detect thresholds in gradual patterns, or they may over or underestimate the threshold position. In conservation or habitat modelling, it is important to focus efforts efficiently and the inappropriate choice of statistical methods may have detrimental consequences. [less ▲]

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See detailThe ecological validity of traditional memory evaluation in relation with controlled memory processes and routinization
Dubreuil, P.; Adam, Stéphane ULg; Bier, N. et al

in Archives of Clinical Neuropsychology (2007), 22(8), 979-989

The neuropsychological evaluation of memory by traditional tests raises questions about their ecological validity, as the results on these tests often have little relation to the memory complaints. In an ... [more ▼]

The neuropsychological evaluation of memory by traditional tests raises questions about their ecological validity, as the results on these tests often have little relation to the memory complaints. In an attempt to explain this lack of relationship, the present study had two objectives: (1) explore the ecological superiority of the Process Dissociation Procedure (PDP) over traditional memory tests and (2) explore the effects of routinization on the relationship between memory complaints and memory tests. Thirty-three participants aged 55-86 years were given the PDP (memory evaluation), two questionnaires evaluating daily memory complaints (QAM and CDS) and a questionnaire evaluating routinization (EPR). The results indicate that the PDP, with its measure of controlled processes, is more ecological than traditional memory tests for elderly people. As well, the participants' lifestyle (routinized versus non-routinized) influenced their results on memory tests. The results are discussed in relation to neuropsychological evaluation and rehabilitation. (C) 2007 National Academy of Neuropsychology. Published by Elsevier Ltd. All rights reserved. [less ▲]

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See detailEcological wood anatomy of 155 African tropical hardwoods
Beeckman, Hans; Fayolle, Adeline ULg; Doucet, Jean-Louis ULg et al

Conference (2013, April 19)

In this study we aimed at identifying the anatomical characters expressing life history traits of woody species from the northern Congo Basin. We crosschecked three databases: the botanical inventories ... [more ▼]

In this study we aimed at identifying the anatomical characters expressing life history traits of woody species from the northern Congo Basin. We crosschecked three databases: the botanical inventories produced during the CoForChange project (857 spp.), the database of life history traits established by the CIRAD (France) and GxABT (Belgium) (464 spp.), and the anatomical database Inside Wood (761 spp. and genera for tropical Africa). A total of 155 shared species was obtained. We performed correspondence analyses between the anatomical characters and two main groups of traits: leaf phenology and light-requirement. Results showed: (i) that wood anatomy is involved in leaf phenology and light-requirement in a significant way (7.56% of the variance on axe1), (ii) that evergreenness was correlated to IAWA characters 14 to 18 (scalariform perforation plates, e.g. Olacaceae) and deciduousness to characters 118 to 122 (storied structures, e.g. Malvaceae and Meliaceae), (iii) that pioneer (P) and non-pioneer light-demanding (NPLD) species showed similar traits but were different from shade-tolerant (ST) species, (iv) that deciduous and evergreen species showed separate distributions, and (v) that wood anatomy validated the well documented strong correlation between evergreen species and ST species, with an inversion of the tendency for deciduous species correlated to P and NPLD species. We conclude that anatomical characters can be used as indicators of life history traits in species-rich biomes. Further investigations are needed to increase the input of wood anatomy in explaining the life history traits in African tropical species. [less ▲]

Detailed reference viewed: 187 (20 ULg)