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Auteur |
Deininger, A.; Faithfull, C.L.; Lange, K.; Bayer, T.; Vidussi, F.; Liess, A. |
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Titre |
Simulated terrestrial runoff triggered a phytoplankton succession and changed seston stoichiometry in coastal lagoon mesocosms |
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Article scientifique |
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Année |
2016 |
Publication |
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Revue Abrégée |
Mar. Environ. Res. |
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Volume |
119 |
Numéro |
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Pages |
40-50 |
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Mots-Clés |
climate change; communities; community composition; Diatoms; dynamics; ecosystems; events; food-web; growth; Mediterranean; Mesocosm; Phytoplankton; plankton; productivity; river flash-flood; schelde; soil; Stoichiometry; Thau lagoon |
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Résumé |
Climate change scenarios predict intensified terrestrial storm runoff, providing coastal ecosystems with large nutrient pulses and increased turbidity, with unknown consequences for the phytoplankton community. We conducted a 12-day mesocosm experiment in the Mediterranean Thau Lagoon (France), adding soil (simulated runoff) and fish (different food webs) in a 2 x 2 full factorial design and monitored phytoplankton composition, shade adaptation and stoichiometry. Diatoms (Chaetoceros) increased fourfold immediately after soil addition, prymnesiophytes and dinoflagellates peaked after six- and 12 days, respectively. Soil induced no phytoplanlcton shade adaptation. Fish reduced the positive soil effect on dinoflagellates (Scripsiella, Glenodinium), and diatom abundance in general. Phytoplankton community composition drove seston stoichiometry. In conclusion, pulsed terrestrial runoff can cause rapid, low quality (high carbon: nutrient) diatom blooms. However, bloom duration may be short and reduced in magnitude by fish. Thus, climate change may shift shallow coastal ecosystems towards famine or feast dynamics. (C) 2016 Elsevier Ltd. All rights reserved. |
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0141-1136 |
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MARBEC @ alain.herve @ |
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2063 |
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Auteur |
Galiana, N.; Lurgi, M.; Claramunt-Lopez, B.; Fortin, M.-J.; Leroux, S.; Cazelles, K.; Gravel, D.; Montoya, J.M. |
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Titre |
The spatial scaling of species interaction networks |
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Article scientifique |
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Année |
2018 |
Publication |
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Revue Abrégée |
Nat. Ecol. Evol. |
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Volume |
2 |
Numéro |
5 |
Pages |
782-790 |
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Mots-Clés |
area relationships; biodiversity; competition; diversity; ecological networks; extinction; food-web structure; habitat loss; source-sink metacommunities; trophic interactions |
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Résumé |
Species-area relationships (SARs) are pivotal to understand the distribution of biodiversity across spatial scales. We know little, however, about how the network of biotic interactions in which biodiversity is embedded changes with spatial extent. Here we develop a new theoretical framework that enables us to explore how different assembly mechanisms and theoretical models affect multiple properties of ecological networks across space. We present a number of testable predictions on network-area relationships (NARs) for multi-trophic communities. Network structure changes as area increases because of the existence of different SARs across trophic levels, the preferential selection of generalist species at small spatial extents and the effect of dispersal limitation promoting beta-diversity. Developing an understanding of NARs will complement the growing body of knowledge on SARs with potential applications in conservation ecology. Specifically, combined with further empirical evidence, NARs can generate predictions of potential effects on ecological communities of habitat loss and fragmentation in a changing world. |
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2397-334x |
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MARBEC @ alain.herve @ |
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2339 |
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Auteur |
Canard, E.F.; Mouquet, N.; Mouillot, D.; Stanko, M.; Miklisova, D.; Gravel, D. |
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Titre |
Empirical Evaluation of Neutral Interactions in Host-Parasite Networks |
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Article scientifique |
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Année |
2014 |
Publication |
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Revue Abrégée |
American Naturalist |
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Volume |
183 |
Numéro |
4 |
Pages |
468-479 |
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Mots-Clés |
abundance; animal mutualistic networks; community; dissimilarity; effort; food-web structure; geographical variation; host-parasite network; network structure; neutrality; null model; phylogenetic signal; reconciling niche; sampling; scale-dependence; species abundance distribution |
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While niche-based processes have been invoked extensively to explain the structure of interaction networks, recent studies propose that neutrality could also be of great importance. Under the neutral hypothesis, network structure would simply emerge from random encounters between individuals and thus would be directly linked to species abundance. We investigated the impact of species abundance distributions on qualitative and quantitative metrics of 113 host-parasite networks. We analyzed the concordance between neutral expectations and empirical observations at interaction, species, and network levels. We found that species abundance accurately predicts network metrics at all levels. Despite host-parasite systems being constrained by physiology and immunology, our results suggest that neutrality could also explain, at least partially, their structure. We hypothesize that trait matching would determine potential interactions between species, while abundance would determine their realization. |
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English |
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0003-0147 |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
573 |
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Auteur |
Albouy, C.; Velez, L.; Coll, M.; Colloca, F.; Le Loc'h, F.; Mouillot, D.; Gravel, D. |
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Titre |
From projected species distribution to food-web structure under climate change |
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Article scientifique |
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Année |
2014 |
Publication |
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Revue Abrégée |
Global Change Biology |
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Volume |
20 |
Numéro |
3 |
Pages |
730-741 |
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Mots-Clés |
climate change; connectance; fish body size; food-webs; generality; Mediterranean Sea; metaweb; niche model; vulnerability |
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ISSN |
1354-1013 |
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Numéro d'Appel |
LL @ pixluser @ |
collection |
324 |
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Auteur |
Sebastian, M.; Smith, A.F.; Gonzalez, J.M.; Fredricks, H.F.; Van Mooy, B.; Koblizek, M.; Brandsma, J.; Koster, G.; Mestre, M.; Mostajir, B.; Pitta, P.; Postle, A.D.; Sanchez, P.; Gasol, J.M.; Scanlan, D.J.; Chen, Y. |
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Titre |
Lipid remodelling is a widespread strategy in marine heterotrophic bacteria upon phosphorus deficiency |
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Article scientifique |
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Année |
2016 |
Publication |
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Revue Abrégée |
Isme J. |
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Volume |
10 |
Numéro |
4 |
Pages |
968-978 |
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Mots-Clés |
2 enzymes; agrobacterium-tumefaciens; bacterioplankton groups; Ecology; Mediterranean Sea; mesocosm experiment; microbial food-web; north-atlantic ocean; nutrient limitation; phosphate starvation |
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Résumé |
Upon phosphorus (P) deficiency, marine phytoplankton reduce their requirements for P by replacing membrane phospholipids with alternative non-phosphorus lipids. It was very recently demonstrated that a SAR11 isolate also shares this capability when phosphate starved in culture. Yet, the extent to which this process occurs in other marine heterotrophic bacteria and in the natural environment is unknown. Here, we demonstrate that the substitution of membrane phospholipids for a variety of non-phosphorus lipids is a conserved response to P deficiency among phylogenetically diverse marine heterotrophic bacteria, including members of the Alphaproteobacteria and Flavobacteria. By deletion mutagenesis and complementation in the model marine bacterium Phaeobacter sp. MED193 and heterologous expression in recombinant Escherichia coli, we confirm the roles of a phospholipase C (PlcP) and a glycosyltransferase in lipid remodelling. Analyses of the Global Ocean Sampling and Tara Oceans metagenome data sets demonstrate that PlcP is particularly abundant in areas characterized by low phosphate concentrations. Furthermore, we show that lipid remodelling occurs seasonally and responds to changing nutrient conditions in natural microbial communities from the Mediterranean Sea. Together, our results point to the key role of lipid substitution as an adaptive strategy enabling heterotrophic bacteria to thrive in the vast P-depleted areas of the ocean. |
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English |
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ISSN |
1751-7362 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1624 |
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