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Auteur |
Aubree, F.; David, P.; Jarne, P.; Loreau, M.; Mouquet, N.; Calcagno, V. |
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Titre |
How community adaptation affects biodiversity-ecosystem functioning relationships |
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Article scientifique |
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Année |
2020 |
Publication |
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Revue Abrégée |
Ecol. Lett. |
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Volume |
23 |
Numéro |
8 |
Pages |
1263-1275 |
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Mots-Clés |
stability; competition; species richness; species interactions; diversity; selection; consequences; species traits; evolution; productivity; food webs; Adaptive dynamics; eco-evolutionary dynamics; invasion; niche differentiation |
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Résumé  |
Evidence is growing that evolutionary dynamics can impact biodiversity-ecosystem functioning (BEF) relationships. However the nature of such impacts remains poorly understood. Here we use a modelling approach to compare random communities, with no trait evolutionary fine-tuning, and co-adapted communities, where traits have co-evolved, in terms of emerging biodiversity-productivity, biodiversity-stability and biodiversity-invasion relationships. Community adaptation impacted most BEF relationships, sometimes inverting the slope of the relationship compared to random communities. Biodiversity-productivity relationships were generally less positive among co-adapted communities, with reduced contribution of sampling effects. The effect of community-adaptation, though modest regarding invasion resistance, was striking regarding invasion tolerance: co-adapted communities could remain very tolerant to invasions even at high diversity. BEF relationships are thus contingent on the history of ecosystems and their degree of community adaptation. Short-term experiments and observations following recent changes may not be safely extrapolated into the future, once eco-evolutionary feedbacks have taken place. |
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English |
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1461-023x |
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MARBEC @ isabelle.vidal-ayouba @ |
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2906 |
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Auteur |
Mostajir, B.; Amblard, C.; Buffan-Dubau, E.; De Wit, R.; Lensi, R.; Sime-Ngando, T. |
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Titre |
Microbial Food Webs in Aquatic and Terrestrial Ecosystems |
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Chapitre de livre |
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Année |
2015 |
Publication |
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Revue Abrégée |
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485-509 |
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Mots-Clés |
Biodiversity; Biogeochemical cycles; Ecological interactions; Microbial Ecology; Microbial food webs; Microbial loop |
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Résumé |
In microbial food webs, different types of interactions occur between microorganisms themselves and with meio- and macroorganisms. After an historical and general introduction, the biological components of the microbial food webs in the pelagic and benthic marine and lake ecosystems, as well as in the terrestrial ecosystems, are presented. The functioning of the microbial food webs in different ecosystems is illustrated and explained, including the trophic pathways and transfer of matter from microbial food webs toward meio- and macroorganisms of the superior trophic levels, the nutrient recycling in the aquatic environments, and the decomposition of organic matter in soils. Finally, the factors regulating microbial food webs, primarily “top-down” and “bottom-up” controls, are described with a special focus on the role of viruses in the aquatic microbial food webs. |
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Springer Netherlands |
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Éditeur |
Bertrand, J.-C.; Caumette, P.; Lebaron, P.; Matheron, R.; Normand, P.; Sime-Ngando, T. |
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Langue |
en |
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Titre Original |
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Titre de collection Abrégé |
Environmental Microbiology: Fundamentals and Applications |
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978-94-017-9117-5 978-94-017-9118-2 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
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1394 |
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Auteur |
Cresson, P.; Chouvelon, T.; Bustamante, P.; Bănaru, D.; Baudrier, J.; Le Loc'h, F.; Mauffret, A.; Mialet, B.; Spitz, J.; Wessel, N.; Briand, M.J.; Denamiel, M.; Doray, M.; Guillou, G.; Jadaud, A.; Lazard, C.; Noûs, C.; Prieur, S.; Rouquette, M.; Saraux, C.; Serre, S.; Timmerman, C.-A.; Verin, Y.; Harmelin-Vivien, M. |
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Titre |
Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems |
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Article scientifique |
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Année |
2020 |
Publication |
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Revue Abrégée |
Progress in Oceanography |
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Volume |
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Numéro |
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Pages |
102343 |
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Mots-Clés |
benthic-pelagic coupling; fish community; food webs; trophodynamics |
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Résumé |
Investigating the drivers of fish assemblage trophic structure is a critical question, in order to better understand ecosystem functioning, predict the effects of perturbations and implement integrated management of exploited marine ecosystems. Ecosystemic surveys enabled the determination of the trophic structure of the fish assemblages in three French marine ecosystems, namely the Eastern English Channel, the Bay of Biscay and the Gulf of Lions, through the simultaneous collection of qualitative (stable isotopes and energy content) and quantitative (biomass) data. In the Bay of Biscay and in the Gulf of Lions, pelagic primary production supported at least 80% of the fish biomass production, and explained the dominance of pelagic species, but with differences resulting from the different productivity. The lower productivity in the oligotrophic Gulf of Lions led to a lower total biomass, energy density as well as the predominance of zooplankton feeders. In contrast, fluxes in the Bay of Biscay were sufficient to support a higher biomass of pelagic piscivores, and of species with higher energy content. In the shallow Eastern English Channel, the respective contributions of pelagic and benthic sources were similar. Bentho-demersal species of higher trophic level dominated this assemblage, because of their ability to exploit both pathways. Results of the present study confirmed that fisheries-focused surveys can be used as efficient platforms to address questions about ecosystem functioning. Here it confirmed the expected differences between ecosystems and the importance of primary production and environment as drivers of fish assemblage structure and functioning. Future studies should nevertheless develop new methods to better assess the paramount role of low trophic level consumers. |
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en |
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ISSN |
0079-6611 |
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Notes |
WOS:000552124300005 |
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pas de |
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Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
2765 |
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Auteur |
Duffy, L.M.; Kuhnert, P.; Pethybridge, H.R.; Young, J.W.; Olson, R.J.; Logan, J.M.; Goñi, N.; Romanov, E.; Allain, V.; Staudinger, M.; Abecassis, M.; Choy, C.A.; Hobday, A.J.; Simier, M.; Galván-Magaña, F.; Potier, M.; Ménard, F. |
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Titre |
Global trophic ecology of yellowfin, bigeye, and albacore tunas: understanding predation on micronekton communities at ocean-basin scales |
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Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
Deep Sea Research Part II: Topical Studies in Oceanography |
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Volume |
140 |
Numéro |
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Pages |
55-73 |
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Mots-Clés |
classification trees; climate changes; ecosystems; food webs; inter-ocean comparison; macroecology; Meta-analysis; trophic relationships |
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Résumé |
Predator-prey interactions for three commercially valuable tuna species: yellowfin (Thunnus albacares), bigeye (T. obesus), and albacore (T. alalunga), collected over a 40-year period from the Pacific, Indian, and Atlantic Oceans, were used to quantitatively assess broad, macro-scale trophic patterns in pelagic ecosystems. Analysis of over 14,000 tuna stomachs, using a modified classification tree approach, revealed for the first time the global expanse of pelagic predatory fish diet and global patterns of micronekton diversity. Ommastrephid squids were consistently one of the top prey groups by weight across all tuna species and in most ocean bodies. Interspecific differences in prey were apparent, with epipelagic scombrid and mesopelagic paralepidid fishes globally important for yellowfin and bigeye tunas, respectively, while vertically-migrating euphausiid crustaceans were important for albacore tuna in the Atlantic and Pacific Oceans. Diet diversity showed global and regional patterns among tuna species. In the central and western Pacific Ocean, characterized by low productivity, a high diversity of micronekton prey was consumed while low prey diversity was evident in highly productive coastal waters where upwelling occurs. Spatial patterns of diet diversity were most variable in yellowfin and bigeye tunas while a latitudinal diversity gradient was observed with lower diversity in temperate regions for albacore tuna. Sea-surface temperature was a reasonable predictor of the diets of yellowfin and bigeye tunas, whereas chlorophyll-a was the best environmental predictor of albacore diet. These results suggest that the ongoing expansion of warmer, less productive waters in the world’s oceans may alter foraging opportunities for tunas due to regional changes in prey abundances and compositions. |
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ISSN |
0967-0645 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2102 |
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Auteur |
Albo-Puigserver, M.; Munoz, A.; Navarro, J.; Coll, M.; Pethybridge, H.; Sanchez, S.; Palomera, I. |
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Titre |
Ecological energetics of forage fish from the Mediterranean Sea: Seasonal dynamics and interspecific differences |
Type |
Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
Deep-Sea Res. Part II-Top. Stud. Oceanogr. |
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Volume |
140 |
Numéro |
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Pages |
74-82 |
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Mots-Clés |
anchovy engraulis-encrasicolus; Bioenergetics; climate-change; diet composition; Energy density; environmental variability; feeding-habits; food webs; horse mackerel; Mediterranean Sea; north aegean sea; osteichthyes carangidae; sardine sardina-pilchardus; small pelagic fish |
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Résumé |
Small and medium pelagic fishes play a central role in marine food webs by transferring energy from plankton to top predators. In this study, direct calorimetry was used to analyze the energy density of seven pelagic species collected over four seasons from the western Mediterranean Sea: anchovy Engraulis encrasicolus, sardine Sardina pilchardus, round sardinella Sardinella aurita, horse mackerels Trachurus trachurus and T. mediterraneus, and mackerels Scomber scombrus and S. colias. Inter-specific differences in energy density were linked to spawning period, energy allocation strategies for reproduction and growth, and feeding ecologies. Energy density of each species varied over time, with the exception of S. colitis, likely due to its high energetic requirements related to migration throughout the year. In general, higher energy density was observed in spring for all species, regardless of their breeding strategy, probably as a consequence of the late-winter phytoplankton bloom. These results provide new insights into the temporal availability of energy in the pelagic ecosystem of the Mediterranean Sea, which are pivotal for understanding how the population dynamics of small and medium pelagic fishes and their predators may respond to environmental changes and fishing impacts. In addition, the differences found in energy density between species highlighted the importance of using species specific energy values in ecosystem assessment tools such as bioenergetic and food web models. |
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English |
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0967-0645 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2176 |
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