| Enregistrements |
| Auteur |
Benedetti, F.; Vogt, M.; Righetti, D.; Guilhaumon, F.; Ayata, S.-D. |
| Titre |
Do functional groups of planktonic copepods differ in their ecological niches? |
Type |
Article scientifique |
| Année |
2018 |
Publication |
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Revue Abrégée |
J. Biogeogr. |
| Volume |
45 |
Numéro |
3 |
Pages |
604-616 |
| Mots-Clés |
climate-change; copepods; species distribution models; north-atlantic; calanus-finmarchicus; mediterranean sea; environmental niche; functional groups; lipid pump; marine ecosystem; oithona-similis; pseudo-absences; trait biogeography; zooplankton; zooplankton fecal pellets |
| Résumé |
Aim: To assess the degree of overlap between the environmental niches of marine planktonic copepods and test if the distribution of copepod functional groups differs across environmental gradients. Location: The Mediterranean Sea. Methods: Functional groups were defined based on clustering of functional traits in 106 marine copepod species using a multivariate ordination analysis. Functional traits included maximum body length, feeding mode, spawning strategy and trophic group. Simultaneously, the global distribution of the species was used to model their environmental niches with six environmental variables. For each of these predictors, four niche parameters were derived from the univariate response curve of each species to summarise their environmental preferences and ordinate the species in niche space through a PCA. Finally, the differences in the position in niche space of functional groups were tested with variance analysis. Results: We identified seven copepod functional groups with different distributions along the environmental gradients covered by our study. While carnivorous functional groups were affiliated with oligotrophic and tropical conditions, large and small current-feeding herbivores are associated with colder, more seasonally varying and productive conditions. Small cruising detritivores and other small current-feeding herbivores were not affiliated with specific conditions as their constituting species were scattered in niche space. Main conclusions: Since copepod functional groups occupy distinct ecological niches, ecosystem processes related to these groups are expected to vary across environmental gradients. Conditions favouring large current-feeding herbivores should allow for enhanced fluxes of energy and nutrients through Mediterranean Sea ecosystems, while such fluxes should be weakened where large carnivores and small passive ambush-feeding copepods dominate. Our study supports the development of trait-based zooplankton functional groups in marine ecosystem models. |
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| Auteur institutionnel |
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Thèse |
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Lieu de Publication |
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Éditeur |
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| Langue |
English |
Langue du Résumé |
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Titre Original |
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| Éditeur de collection |
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Titre de collection |
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Titre de collection Abrégé |
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| Volume de collection |
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Numéro de collection |
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Edition |
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| ISSN |
0305-0270 |
ISBN |
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Médium |
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Expédition |
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Conférence |
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| Notes |
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Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2311 |
| Lien permanent pour cet enregistrement |
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| Auteur |
Durant, J.M.; Molinero, J.-C.; Ottersen, G.; Reygondeau, G.; Stige, L.C.; Langangen, O. |
| Titre |
Contrasting effects of rising temperatures on trophic interactions in marine ecosystems |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée |
Sci Rep |
| Volume |
9 |
Numéro |
|
Pages |
15213 |
| Mots-Clés |
biodiversity; calanus-finmarchicus; climate-change; fluctuations; life-history; mallotus-villosus; match; mismatch; phenology; thermal tolerance |
| Résumé |
In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted to this pattern by synchronising life-history events such as reproduction with prey availability. However, changing temperatures may pose unprecedented challenges by decoupling the predator-prey interactions. Here we build a predator-prey model accounting for the full life-cycle of fish and zooplankton including their phenology. The model assumes that fish production is bottom-up controlled by zooplankton prey abundance and match or mismatch between predator and prey phenology, and is parameterised based on empirical findings of how climate influences phenology and prey abundance. With this model, we project possible climate-warming effects on match-mismatch dynamics in Arcto-boreal and temperate biomes. We find a strong dependence on synchrony with zooplankton prey in the Arcto-boreal fish population, pointing towards a possible pronounced population decline with warming because of frequent desynchronization with its zooplankton prey. In contrast, the temperate fish population appears better able to track changes in prey timing and hence avoid strong population decline. These results underline that climate change may enhance the risks of predator-prey seasonal asynchrony and fish population declines at higher latitudes. |
| Adresse |
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| Auteur institutionnel |
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Thèse |
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| Editeur |
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Lieu de Publication |
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Éditeur |
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| Langue |
English |
Langue du Résumé |
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Titre Original |
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| Éditeur de collection |
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Titre de collection |
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Titre de collection Abrégé |
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| Volume de collection |
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Numéro de collection |
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Edition |
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| ISSN |
2045-2322 |
ISBN |
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Médium |
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Expédition |
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Conférence |
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| Notes |
WOS:000491859500003 |
Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
2668 |
| Lien permanent pour cet enregistrement |
