References of "Gobert, Sylvie"
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See detailPhysical modelling of water, fauna and flora: knowledge gaps, avenues for future research and infrastructural needs
ROBERT, THOMAS; JOHNSON, MATTHEW; FROSTICK, LYNNE et al

in Journal of Hydraulic Research (2014), 52

Physical modelling is a key tool for generating understanding of the complex interactions between aquatic organisms and hydraulics, which is important for management of aquatic environments under ... [more ▼]

Physical modelling is a key tool for generating understanding of the complex interactions between aquatic organisms and hydraulics, which is important for management of aquatic environments under environmental change and our ability to exploit ecosystem services. Many aspects of this field remain poorly understood and the use of physical models within eco-hydraulics requires advancement in methodological application and substantive understanding. This paper presents a review of the emergent themes from a workshop tasked with identifying the future infrastructure requirements of the next generation of eco-hydraulics researchers. The identified themes are: abiotic factors, adaptation, complexity and feedback, variation, and scale and scaling. The paper examines these themes and identifies how progress on each of them is key to existing and future eðorts to progress our knowledge of eco-hydraulic interactions. Examples are drawn from studies on biofilms, plants, and sessile and mobile fauna in shallow water fluvial and marine environments. Examples of research gaps and directions for educational, infrastructural and technological advance are also presented. [less ▲]

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See detailThe effect of size, weight, body compartment, sex and reproductive status on the bioaccumulation of 19 trace elements in rope-grown Mytilus galloprovincialis
Richir, Jonathan ULg; Gobert, Sylvie ULg

in Ecological Indicators (2014), 36

Numerous trace elements (TEs) can be considered as potential pollutants of the environment, their mining productions and industrial uses increasing worldwide. Their monitoring can be achieved through the ... [more ▼]

Numerous trace elements (TEs) can be considered as potential pollutants of the environment, their mining productions and industrial uses increasing worldwide. Their monitoring can be achieved through the use of bioindicator species, such as the Mediterranean mussel Mytilus galloprovincialis (Lamarck, 1819). That species has been widely used to monitor the chemical pollution of coastal ecosystems by Cr, Ni, Cu, Zn, Cd, Pb, As, Ag and V. Conversely, environmental levels of Be, Al, Fe, Mn, Co, Se, Mo, Sn, Sb and Bi have been little or not monitored so far in mussel watch programs. Bioaccumulation processes of these 19 TEs in rope-grown M. galloprovincialis purchased from a salt pond with good chemical water quality were thus investigated in the present study. Mussels efficiently accumulated the 19 studied TEs. Bioaccumulation processes were driven by numerous mutually dependent biological parameters such as the mussel size and flesh weight, the sex and the reproductive status and the body compartment considered. TE bioaccumulation was a power function of the mussel soft body dry weight; total contents linearly increased with the shell length. Small-size mussels overall concentrated more TEs, with a high inter-individual variability, consequently influencing the modelling of their bioaccumulation in the whole rope population. Although a large range of rope-grown M. galloprovincialis sizes can be used for monitoring purposes, one will thus take care not to use extreme size individuals. The influence of gametogenesis in determining female body higher TE concentrations prior to spawning could not be neglected and varied depending on the element. TEs were preferentially accumulated in the hepatopancreas, except for Zn, Se, Cd and Mo, more concentrated in gills. Gametogenesis did not influence TE distribution between body compartments, but likely diluted their concentrations as a direct consequence of massive reproductive tissue production. So, results from the present study underline the potential use of M. galloprovincialis in the biomonitoring of numerous little studied TEs and give some insights into the decisive role played by some relevant biological parameters in bioaccumulation processes of the 19 investigated TEs in rope-grown mussels. [less ▲]

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See detailSeasonal and depth-related biodiversity of leaf epiphytic Cheilostome Bryozoa in a Mediterranean Posidonia oceanica meadow
Lepoint, Gilles ULg; Balancier, Boris; Gobert, Sylvie ULg

in Cahiers de Biologie Marine (2014), 55(1),

: Epiphytes living fixed on Posidonia oceanica L. (Delile) are important faunal and floral components of seagrass meadow ecosystems. They are involved as main actors in trophic web and major ecosystem ... [more ▼]

: Epiphytes living fixed on Posidonia oceanica L. (Delile) are important faunal and floral components of seagrass meadow ecosystems. They are involved as main actors in trophic web and major ecosystem processes of this endangered coastal habitat. This paper aims to assess the seasonality and the bathymetric variability of epiphytic Bryozoa which are the most important animal group in terms of both diversity and abundance living on P. oceanica leaves. Posidonia shoots were collected from the Revellata Bay (Corsica, France) in four seasons from 7 to 30 m depth. Colony densities reached more than 87000 colonies. m-2 at 10 m depth in spring. The bryozoan species distribution and abundance changed substantially according to seasons and depths, being maximum in spring and minimal in winter. Dominant colony morphotypes change according to depth, probably in relation with water motion gradient. This confirms that there are bathymetric and seasonal variability for different epiphytic organisms colonizing the Posidonia leaves. This enlightens the importance to protect Posidonia meadow on its full depth extension and in its connectivity with other habitats to conserve optimal epiphytic biodiversity and functions. [less ▲]

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See detailRéseaux de surveillance DCE – Campagne 2012 – District « Corse »
Derolez, Valérie; Sargian, Peggy; Balbi, Yves et al

Report (2013)

Les programmes de surveillance liés à la mise en ╒uvre de la DCE sont coordonnés par le Ministère de l!Ecologie, du Développement Durable, des Transports et du Logement (MEDDTL). Dans chaque bassin ... [more ▼]

Les programmes de surveillance liés à la mise en ╒uvre de la DCE sont coordonnés par le Ministère de l!Ecologie, du Développement Durable, des Transports et du Logement (MEDDTL). Dans chaque bassin hydrographique ce sont les Agences de l!eau qui, avec l!Etat, prennent en charge l!application, la mise en ╒uvre de ces réseaux. Sur la façade méditerranéenne, Ifremer a assuré pour le compte du Schéma Directeur des Données sur l!Eau la maîtrise d!ouvrage de la troisième campagne du contrôle de surveillance, en coordonnant l!ensemble de l!acquisition des données et de leur synthèse en collaboration avec de nombreux partenaires : les Universités, des bureaux d!études, des structures locales de gestion et les services de l!Etat. Les résultats de cette troisième campagne de contrôles de surveillance DCE permettent d!avoir une bonne vision d!ensemble de la qualité des eaux littorales à l!échelle du district. Outre le suivi de la contamination chimique dans la matière vivante, cette campagne s!est enrichie d!un suivi dans la colonne d!eau avec l!utilisation d!échantillonneurs passifs. En eaux côtières, une seule masse d'eau est déclassée en raison de l'état chimique. Tous les éléments biologiques sont caractérisés par un très bon/bon état. Pour les eaux de transition, leur qualité biologique est déclassée par les macrophytes et/ou le phytoplancton. La classification officielle de l!état des masses d!eau du district se fera par le Système d!Evaluation de l!Etat des Eaux (SEEE), sous la responsabilité technique de l!Onema. [less ▲]

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See detailThe underestimation of seagrass biological cycle in the biomonitoring of coastal trace element pollution
Richir, Jonathan ULg; Sartoretto, Stéphane; Gobert, Sylvie ULg

Poster (2013, December)

Previous monitoring surveys using the Mediterranean seagrass Posidonia oceanica (L.) Delile mostly studied coastal pollutions in Cr, Ni, Cu, Zn, Cd, Pb and/or Fe and the distribution of their ... [more ▼]

Previous monitoring surveys using the Mediterranean seagrass Posidonia oceanica (L.) Delile mostly studied coastal pollutions in Cr, Ni, Cu, Zn, Cd, Pb and/or Fe and the distribution of their bioaccumulated levels between the seagrass compartments. In contrast, other trace elements (TEs) like As, V, Ag, Be, Al, Mn, Co, Se, Mo, Sn, Sb and Bi, many of them categorized as TEs of environmental emerging concern, have been subject to nearly no ecotoxicological survey with that species. Moreover, the understanding of the seasonal variation of TE levels according to the seagrass biological cycle, a prerequisite to the intercomparison of sites sampled at different periods of the year, has been little investigated. P. oceanica were thus seasonally collected for TE analyses from March 2008 to November 2010 in the Calvi Bay (Corsica, France), a reference site for the northwestern Mediterranean, and near the sewer outfall of Marseille city (France). Results showed that levels of the 19 studied TEs evolved seasonally according to the seagrass biological cycle. So, foliar levels of Cr, Pb, Mn or Bi, preferentially accumulated in older leaves, increased from spring to autumn, as the number of adult leaves. V, Se, As or Sb evolved similarly to the shoot foliar surface, reflecting the plant growth. Cu levels, an essential micronutrient, were lower when summer requirements for leaf growth were high. Al foliar levels evolved similarly to rhizome and root levels, resulting from its acropetal translocation. However, in the anthropized Marseille site, environmental variables non-intrinsic to the seagrass ecophysiology could perturb this seasonal variation. This survey allowed highlighting the proportionally equivalent roles played by both the seagrass biological cycle and its environment in the bioaccumulation process of TEs. This cyclic evolution should therefore be systematically quantified in regional reference sites in order to properly intercompare results from biomonitoring surveys. [less ▲]

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See detailRecent advances in the biomonitoring of trace elements using P. oceanica (L.) Delile
Gobert, Sylvie ULg; Richir, Jonathan ULg

in de Lange, Gert J.; Gacic, Miroslav; Romaña, Axel (Eds.) et al 40th CIESM Congress Proceedings (2013, November)

One of the most studied bioindicator in the Mediterranean is the seagrass Posidonia oceanica. Trace element (TE) monitoring surveys using that species have however mostly focussed on a few elements (e.g ... [more ▼]

One of the most studied bioindicator in the Mediterranean is the seagrass Posidonia oceanica. Trace element (TE) monitoring surveys using that species have however mostly focussed on a few elements (e.g. Pb, Cd), while numerous others, efficiently bioconcentrated by the plant and potentially toxic, have been barely or not studied (e.g. Ag, V, Bi). Furthermore, although P. oceanica bioaccumulation behaviour relies on synergistic effects between the sampling environment and its ecophysiology, this aspect has been mostly underestimated until now. This study presents recent advances in the biomonitoring of TEs using P. oceanica and insists on the necessity of developing consensual monitoring protocols in order to improve its use as bioindicator. [less ▲]

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See detailProtection effects or natural variability? The case of seagrass amphipods
Sturaro, Nicolas ULg; Lepoint, Gilles ULg; Pérez-Perera, Amanda et al

Conference (2013, October)

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See detailL’indice paysager Caulerpa racemosa “I.Ca.r”
Cariou, Nicolas; Chery, Aurélia; Jousseaume, Matthieu et al

in Ifremer (Ed.) CARtographie des HAbitats Marins Benthiques : de l'Acquisition à la Restitution (2013, March 27)

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette ... [more ▼]

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette époque, le nombre et la surface des sites envahis augmentent. L'analyse fine de l'évolution spatio-temporelle de sa distribution dans la zone prospectée confirme que C. racemosa colonise d'abord les sites profonds. A partir des différents stades de colonisation, un indice paysager (Indice Caulerpa racemosa: "I.Ca.r") adapté à la plongée en scaphandre autonome a été élaboré. "I.Ca.r" qui tient compte de l'expérience du plongeur, du type de substrat et de la superficie colonisée est un code à 8 caractères. Il permet une comparaison spatiale de sites colonisés et également une analyse de l'évolution temporelle de la colonisation. Mis au point en Baie de Calvi, l'indice paysager "I.Ca.r" peut être appliqué sur la Corse et sur l'ensemble de La Méditerranée. La méthodologie simple, résumée sur une fiche pourrait être distribuée dans les clubs de plongée et les informations envoyées au réseau Caulerpe par exemple. [less ▲]

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See detailExperimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 trace elements
Richir, Jonathan ULg; Luy, Nicolas; Lepoint, Gilles ULg et al

in Aquatic Toxicology (2013), 140-141

The Mediterranean seagrass Posidonia oceanica (L.) Delile has been used for trace element (TE) biomonitoring since decades ago. However, present informations for this bioindicator are limited mainly to ... [more ▼]

The Mediterranean seagrass Posidonia oceanica (L.) Delile has been used for trace element (TE) biomonitoring since decades ago. However, present informations for this bioindicator are limited mainly to plant TE levels, while virtually nothing is known about their fluxes through P. oceanica meadows. We therefore contaminated seagrass bed portions in situ at two experimental TE levels with a mix of 15 TEs (Al, V,Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi) to study their uptake and loss kinetics in P. oceanica. Shoots immediately accumulated pollutants from the beginning of exposures. Once contaminations ended, TE concentrations came back to their original levels within two weeks, or at least showed a clear decrease. P. oceanica leaves exhibited different uptake kinetics depending on elements and leaf age: the younger growing leaves forming new tissues incorporated TEs more rapidly than the older senescent leaves. Leaf epiphytes also exhibited a net uptake of most TEs, partly similar to that of P. oceanica shoots. The principal route of TE uptake was through the water column, as no contamination of superficial sediments was observed. However, rhizomes indirectly accumulated many TEs during the overall experiments through leaf to rhizome translocation processes. This study thus experimentally confirmed that P.oceanica shoots are undoubtedly an excellent short-term bioindicator and that long-term accumulations could be recorded in P. oceanica rhizomes. [less ▲]

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See detailSoft-bottom macrobenthos monitoring in the framework of the STARE-CAPMED program
Donnay, Annick ULg; Pelaprat, Corinne; Fréjefond, Charlène et al

in CIESM Congress Proceedings n*40 (2013)

STARE-CAPMED is a research program set up by the Stareso research station (Calvi, Corsica). Its aim is to improve the understanding of processes by which anthropogenic activities have adversed effects on ... [more ▼]

STARE-CAPMED is a research program set up by the Stareso research station (Calvi, Corsica). Its aim is to improve the understanding of processes by which anthropogenic activities have adversed effects on the functioning of Calvi Bay coastal ecosystems. One of its work packages is the monitoring of soft-bottom macrobenthos along 5 gradients of potential anthropogenic pressures. First results suggest that, before summer (summer is the period where man-driven impacts are expected to be stronger due to high tourist frequentation) these sources of potential anthropogenic pressures perturb soft-bottom macrobenthos assemblages. [less ▲]

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See detailAn adapted staining-destaining method to sort soft-bottom macrobenthos mixed with Posidonia oceanica fibers
Donnay, Annick ULg; Pelaprat, C; Lejeune, P et al

in Mediterranean Marine Science (2013), 14(1), 92-94

Sorting   of   soft-­bottom   macrobenthos   entangled   with   Posidonia   oceanica fibers is time-consuming and tedious because of the weak of colour contrast .  This   paper   describes   a   staining ... [more ▼]

Sorting   of   soft-­bottom   macrobenthos   entangled   with   Posidonia   oceanica fibers is time-consuming and tedious because of the weak of colour contrast .  This   paper   describes   a   staining-­destaining   technique   that   produces   good   contrast   between   soft-­bottom   macrobenthos  and  Posidonia  oceanica fibers. The method has been tested on Corsican samples in oligotrophic areas characterized by small-size soft-bottom macrofauna. Our technique saves sorting time (-24%) and is simple to implement. [less ▲]

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See detailIndicateur Angiospermes/Herbiers de Posidonies PREI (Facade Mediterranée, Masses d'eaux Côtières
Gobert, Sylvie ULg

in Guide relatif aux règles d’évaluation de l’état des eaux littorales (eaux côtières et eaux de transition) en vue de la mise à jour de l’état des lieux 2013 (2013)

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See detailEstablishing research strategies, methodologies and technologies to link genomics and proteomics to seagrass productivity, community metabolism, and ecosystem carbon fluxes
Mazzuca, Silvia; Bjork, M; Beer, S et al

in Frontiers in Plant Science (2013), 4(38), 1-19

A complete understanding of the mechanistic basis of marine ecosystem functioning is only possible through integrative and interdisciplinary research.This enables the prediction of change and possibly the ... [more ▼]

A complete understanding of the mechanistic basis of marine ecosystem functioning is only possible through integrative and interdisciplinary research.This enables the prediction of change and possibly the mitigation of the consequences of anthropogenic impacts. One major aim of the European Cooperation in Science and Technology (COST) Action ES0609 “Seagrasses productivity. From genes to ecosystem management,” is the calibration and synthesis of various methods and the development of innovative techniques and protocols for studying seagrass ecosystems. During 10 days, 20 researchers representing a range of disciplines (molecular biology, physiology, botany, ecology, oceanography, and underwa- ter acoustics) gathered at The Station de Recherches Sous-marines et Océanographiques (STARESO, Corsica) to study together the nearby Posidonia oceanica meadow. STARESO is located in an oligotrophic area classified as “pristine site” where environmental distur- bances caused by anthropogenic pressure are exceptionally low. The healthy P. oceanica meadow, which grows in front of the research station, colonizes the sea bottom from the surface to 37 m depth. During the study, genomic and proteomic approaches were integrated with ecophysiological and physical approaches with the aim of understanding changes in seagrass productivity and metabolism at different depths and along daily cycles. In this paper we report details on the approaches utilized and we forecast the potential of the data that will come from this synergistic approach not only for P. oceanica but for seagrasses in general. [less ▲]

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See detailJournée de rencontre entre L'institut des Radio-Elements et L'Université de Liège
Debois, Valérie; Gobert, Sylvie ULg

Diverse speeche and writing (2012)

Présentation des activités du CART (Caroline Douny), de l'Unité D'Analyses, Qualité et Risques (JP Bathélémy), du Bureau Envirinnement et Analyses de Gembloux (Ph Maesen), du laboratoire des ressources ... [more ▼]

Présentation des activités du CART (Caroline Douny), de l'Unité D'Analyses, Qualité et Risques (JP Bathélémy), du Bureau Envirinnement et Analyses de Gembloux (Ph Maesen), du laboratoire des ressources Hydriques (V Debbait) et du laboratoire d'Océanologie (S Gobert).Pistes de Collaborations. [less ▲]

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See detailA study of Electra posidoniae Gautier (Cheleistomata, Anasca), a bryozoan strictly found as epiphyte of the seagrass Posidonia oceanica (L.) Delile.
Lepoint, Gilles ULg; Mouchette, Olivier; Pelaprat, Corinne et al

Poster (2012, November 26)

Species living as epiphytes of marine macrophytes have often important role in ecosystem functioning, such as food web suppliers. Some animal or algae species may be considered as really specialised in ... [more ▼]

Species living as epiphytes of marine macrophytes have often important role in ecosystem functioning, such as food web suppliers. Some animal or algae species may be considered as really specialised in the colonization of plant substrate and often dominates epiphytic community, particularly, on long life-span seagrass and macroalgae species. Because epiphytic compartment dysfunction is often implied in seagrass human-induced declining, it is important to understand dynamics and life traits of its specific component in pristine area. In our study, colonization dynamics, biomass seasonality, diet composition of Electra posidoniae, an epiphytic bryozoa, strictly found on the leaves of the seagrass Posidonia oceanica and dominating the leaf epifauna, were assessed monthly at 10 metre depth in the Revellata Bay (Corsica, Mediterranean sea). Aiming to delineate their trophic role in the ecosystem, we have performed bulk stable isotopes measurements and gut content analysis. [less ▲]

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See detailAn overview of the microbenthic loop in Posidonia oceanica meadows: the good, the bad and the ugly
Pete, Dorothée ULg; Quattrocchi, Loïc; Velimirov, Branko et al

in Creed, J.C.; Oigman-Pszczol, S.S. (Eds.) Proceedings of the 10th International Seagrass Biology Workshop (ISBW10), 25- 30 November 2012, Armação dos Búzios, Brazil (2012, November)

Posidonia oceanica is an endemic seagrass of the Mediterranean Sea. The ecosystem based on this plant is essential from an ecological and economical point of view (commercial species, touristic activities ... [more ▼]

Posidonia oceanica is an endemic seagrass of the Mediterranean Sea. The ecosystem based on this plant is essential from an ecological and economical point of view (commercial species, touristic activities, oxygen production), though very sensitive to environmental perturbations. To detect those perturbations, scientists are trying to find more efficient ecological indicators. Most of the time, those indicators are based on the plant itself. Unfortunately, this seagrass does not react very quickly to perturbations so, when a reaction is noticed, it is often too late to prevent irremediable damages to the ecosystem. The sedimentary compartment of P. oceanica meadows has been less studied than the canopy level. However, it could be a good source of ecological indicators because it is the final container of all the pollution. In this framework, the microbenthic loop has been studied. It is a major subsystem of those meadows and encompasses organic matter, bacteria, microphytobenthos and meiofauna. As those organisms have a rapid turnover and stay almost all their life inside the sediment, they seemed good potential indicators. This presentation will show what is useful or not inside the sediment and more specifically inside the microbenthic loop. Results of a comparison between a fish farm and a reference location will be used, as well as in situ experiments (shading and sediment loading) and small spatial scale variations. At the end of this presentation, you will know what are the good, the bad and the ugly in the sedimentary compartment of a P. oceanica meadow. [less ▲]

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See detailSeagrass productivity, from genes to ecosystem management - benthic incubations
Gobert, Sylvie ULg; Lepoint, G.; Richir, Jonathan ULg et al

Scientific conference (2012, October 09)

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See detailTrophic tracers reveal considerable diversity among diets of dominant amphipods from Posidonia oceanica seagrass meadows
Michel, Loïc ULg; Dauby, Patrick ULg; Gobert, Sylvie ULg et al

Poster (2012, August 20)

Mediterranean Posidonia oceanica meadows shelter a high biomass and an important biodiversity of amphipod crustaceans. In other temperate meadows, the amphipods play an important part in the functioning ... [more ▼]

Mediterranean Posidonia oceanica meadows shelter a high biomass and an important biodiversity of amphipod crustaceans. In other temperate meadows, the amphipods play an important part in the functioning of the ecosystem, notably in organic matter transfers from producers to higher level consumers. However, the situation in Posidonia oceanica meadows remains unclear, and little is known about the trophic ecology of amphipods, which are generally regarded as generalist herbivores/detritivores despite the lack of precise studies. Here, we combined gut content examination and trophic markers (fatty acids, stables isotopes of C and N) to delineate the diet of the dominant species of amphipods from Posidonia oceanica seagrass meadows and to highlight trophic diversity among this community. Our results indicate that contribution of microepiphytic diatoms and of benthic and suspended particulate organic matter to the diet of amphipods were anecdotal. On the other hand, all dominant species heavily relied on macroalgal epiphytes, suggesting a certain extent of overlapping in the diets of the dominant species. Considerable interspecific differences nonetheless existed, notably concerning grazing preferences towards epiphytes from leaves or litter fragments vs. epiphytes from rhizomes. In addition, the use of the SIAR isotopic mixing model showed that most species had a mixed diet, and relied on several food items. None of the examined species seemed to graze on their seagrass host, but Gammarus aequicauda partly relied on seagrass leaf detritus. Overall, our findings demonstrate that amphipods have the potential to be key-items in trophic and functional interactions occurring among Mediterranean Posidonia oceanica meadows. [less ▲]

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See detailL'océanographie , c'est quoi?
Gobert, Sylvie ULg

Conference given outside the academic context (2012)

Présentation de l'océanographie: définition, notion de base, histoire de l'océanographie à Liège

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