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Auteur (down) van der Geest, M.; Sall, A.A.; Ely, S.O.; Nauta, R.W.; van Gils, J.A.; Piersma, T.
Titre Nutritional and reproductive strategies in a chemsoymbiotic bivalve living in a tropical intertidal seagrass bed Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Ecology Progress Series
Volume 501 Numéro Pages 113-126
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Numéro d'Appel MARBEC @ alain.herve @ 848 collection 1378
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Auteur (down) van der Geest, M.; van der Lely, J.A.C.; van Gils, J.A.; Piersma, T.; Lok, T.
Titre Density-dependent growth of bivalves dominating the intertidal zone of Banc d’Arguin, Mauritania: importance of feeding mode, habitat and season Type Article scientifique
Année 2019 Publication Revue Abrégée Marine Ecology Progress Series
Volume 610 Numéro Pages 51-63
Mots-Clés Carrying capacity; Chemosymbiosis; Density dependence; Environmental heterogeneity; Feeding guild; Seagrass; Soft-sediment habitat
Résumé Accurate predictions of population dynamics require an understanding of the ways by which environmental conditions and species-specific traits affect the magnitude of density dependence. Here, we evaluated the potential impact of season and habitat (characterized by sediment grain size and seagrass biomass) on the magnitude of density dependence in shell growth of 3 infaunal bivalve species dominating the tropical intertidal benthic communities of Banc d’Arguin, Mauritania. Two of our focal species were filter feeders (Senilia senilis and Pelecyora isocardia) and one was a facultative mixotroph (Loripes orbiculatus), mainly relying on organic carbon provided by sulphide-oxidizing endosymbiotic gill-bacteria (i.e. chemosymbiotic). Distinguishing 2 seasons, winter and summer, we manipulated local bivalve densities across habitats (from bare sandy sediments to seagrass-covered mud). In situ growth of individually tagged and relocated clams was measured and compared with those of tagged clams that were allocated to adjacent sites where local bivalve densities were doubled. Growth was negatively density-dependent in both winter and summer in P. isocardia and L. orbiculatus, the 2 species that mainly inhabit seagrass sediments, but not in S. senilis, usually found in bare sediments. As reproduction and survival rates are generally size-dependent in bivalves, our results suggest that in our tropical study system, the bivalve community of seagrass-covered sediments is more strongly regulated than that of adjacent bare sediments, regardless of species-specific feeding mode or season. We suggest that ecosystem engineering by seagrasses enhances environmental stability, which allows bivalve populations within tropical seagrass beds to stay close to carrying capacity.
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ISSN 0171-8630, 1616-1599 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2488
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Auteur (down) Trenkel, V.M.; Vaz, S.; Albouy, C.; Brind’Amour, A.; Duhamel, E.; Laffargue, P.; Romagnan, J.B.; Simon, J.; Lorance, P.
Titre We can reduce the impact of scientific trawling on marine ecosystems Type Article scientifique
Année 2019 Publication Revue Abrégée Marine Ecology Progress Series
Volume 609 Numéro Pages 277-282
Mots-Clés Ecosystem-based management; Genetic methods; Impacts of bottom trawling; Marine surveying; Monitoring ethics
Résumé The negative impacts that scientific monitoring may have on marine ecosystems has been a neglected topic, mainly on the basis that its magnitude is minor compared to commercial fisheries, even though this raises ethical and, in certain cases, conservation issues. We argue that ethical principles should lead us to reconsider marine wildlife resource monitoring such as the fish and shellfish trawl surveys providing the science-based evidence needed for fisheries management and assessment of how environmental change affects marine shelf communities worldwide. Recent scientific and technological progress has provided methods and tools which might now be harnessed to reduce the impact of marine monitoring. We review these alternative methods, consider modifications to current practices and identify areas requiring further research.
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Langue en Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0171-8630, 1616-1599 ISBN Médium
Région Expédition Conférence
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2519
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Auteur (down) Pethybridge, H.; BODIN, N.; Arsenault-Pernet, E.-J.; BOURDEIX, J.-H.; BRISSET, B.; BIGOT, J.-L.; ROOS, D.; Peter, M.
Titre Temporal and inter-specific variations in forage fish feeding conditions in the NW Mediterranean: lipid content and fatty acid compositional changes Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Ecology Progress Series
Volume 512 Numéro Pages 39-54
Mots-Clés Clupeiformes; ecosystem health; Environmental variations; Nutritional condition; Prey Quality; Trophic markers
Résumé We describe the total lipid content, lipid class composition and fatty acid profiles of adult forage fishes (anchovy, sardine and sprat) sampled in the NW Mediterranean Sea in 2010 and 2011. Inter-and intra-species differences were mostly related to sampling period with limited effect of gender or total length. As an assemblage, total lipid content and relative levels of triacylglycerols and fatty acids 16:1n7, 20:5n3 and 14:0 in forage fish were highest in summer and autumn, indicating better feeding conditions and a more pronounced diatom-supported food web. In contrast, total lipid content was lowest at the end of winter and spring, and coincided with high levels of 22:6n3, indicating a more herbivorous diet based on dinoflagellates. Resource partitioning and niche separation, as inferred from fatty acid profiles, were apparent between species. Sardine showed a more diverse, temporally separated feeding strategy than anchovy, and dietary overlap was higher in winter than summer with sardine having higher markers of copepods, 22:1n11 and 20:1n9. Sprat collected in winter occupied a separate niche area to both sardine and anchovy with higher total lipid content and carnivory biomarker 18:1n9. Our results show that the lipid dynamics of forage fishes can be used to gain quantitative insights into sub-system level changes in species interactions, including prey and predator productivity.
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Volume de collection Numéro de collection Edition
ISSN 0171-8630 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1129
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Auteur (down) Peckham, S.H.; Maldonado-Diaz, D.; Tremblay, Y.; Ochoa, R.; Polovina, J.; Balazs, G.; Dutton, P.H.; Nichols, W.J.
Titre Demographic implications of alternative foraging strategies in juvenile loggerhead turtles Caretta caretta of the north Pacific Ocean Type Article scientifique
Année 2011 Publication Revue Abrégée Marine Ecology Progress Series
Volume 425 Numéro Pages 269-280
Mots-Clés Donnees; Du; Ethologie; habitat; juvenile; Migration; Nord; Pacifique; Peuplement; Sa℡Lite; structure; Trophique
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Volume de collection Numéro de collection Edition
ISSN 1616-1599 ISBN Médium
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Notes Approuvé pas de
Numéro d'Appel LL @ pixluser @ collection 158
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