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Registros recuperados: 11
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Assessing the relationships between phylogenetic and functional singularities in sharks (Chondrichthyes) ArchiMer
Cachera, Marie; Le Loc'H, Francois.
The relationships between diversity and ecosystem functioning have become a major focus of science. A crucial issue is to estimate functional diversity, as it is intended to impact ecosystem dynamics and stability. However, depending on the ecosystem, it may be challenging or even impossible to directly measure ecological functions and thus functional diversity. Phylogenetic diversity was recently under consideration as a proxy for functional diversity. Phylogenetic diversity is indeed supposed to match functional diversity if functions are conservative traits along evolution. However, in case of adaptive radiation and/or evolutive convergence, a mismatch may appear between species phylogenetic and functional singularities. Using highly threatened taxa,...
Tipo: Text Palavras-chave: Adaptive radiation; Conservation; Endangered clade; Evolutionary convergence; Niche conservatism; Phylogenetic signal.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00400/51113/69865.pdf
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Benthic and fish aggregation inside an offshore wind farm: Which effects on the trophic web functioning? ArchiMer
Raoux, Aurore; Tecchio, Samuele; Pezy, Jean-philippe; Lassalle, Geraldine; Degraer, Steven; Wilhelmsson, Dan; Cachera, Marie; Ernande, Bruno; Le Guen, Camille; Haraldsson, Matilda; Grangere, Karine; Le Loc'H, Francois; Dauvin, Jean-claude; Niquil, Nathalie.
As part of the energy transition, the French government is planning the construction of three offshore wind farms in Normandy (Bay of Seine and eastern part of the English Channel, north-western France) in the next years. These offshore wind farms will be integrated into an ecosystem already facing multiple anthropogenic disturbances such as maritime transport, fisheries, oyster and mussel farming, and sediment dredging. Currently no integrated, ecosystem-based study on the effects of the construction and exploitation of offshore wind farms exists, where biological approaches generally focused on the conservation of some valuable species or groups of species. Complementary trophic web modelling tools were applied to the Bay of Seine ecosystem (to the 50...
Tipo: Text Palavras-chave: Marine renewable energies; Reef effect; Wind farm; Ecopath with Ecosim; Ecosystem-based approach.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00347/45843/46723.pdf
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Depth gradient on the resource use of a fish community from a semi-enclosed sea ArchiMer
Giraldo, Carolina; Ernande, Bruno; Cresson, Pierre; Kopp, Dorothee; Cachera, Marie; Travers-trolet, Morgane; Lefebvre, Sebastien.
Depth is one of the environmental variables influencing the structure of marine food webs by directly or indirectly influencing benthic-pelagic coupling and predator-prey relationships. In shallow waters, the high degree of connectivity between pelagic and benthic networks results in complex systems with multiple interactions. Digestive tract (DT) and stable isotope (SI) analyses were used to investigate depth-related changes in feeding patterns for 33 fish species (eastern English Channel [EEC]) collected between 5 m and 80 m depth. Fish species were first arranged into functional groups based upon trophic and habitat similarities. DTs were used to determine the general topology of the food web and SIs were used to estimate the contributions of different...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00386/49711/52255.pdf
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Diet is correlated with otolith shape in marine fish ArchiMer
Mille, Tiphaine; Mahe, Kelig; Cachera, Marie; Villanueva, Ching-maria; De Pontual, Helene; Ernande, Bruno.
Previous studies have shown that food amount influence fish otolith structure, opacity and shape and that diet composition has an effect on otolith chemical composition. This study investigated the potential correlation between diet and otolith shape in 5 wild marine fish species by addressing 4 complementary questions. First, is there a global relationship between diet and otolith shape? Second, which prey categories are involved in this relationship? Third, what are the respective contributions of food quantity and relative composition to diet–otolith shape co-variation? Fourth, is diet energetic composition related to otolith shape? For each species, we investigated how otolith shape varies with diet. These questions were tackled by describing diet in...
Tipo: Text Palavras-chave: Fourier analysis; English Channel; Interspecific; Morphometric analysis; Otolith growth; Saccular otolith; Stomach contents.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00345/45639/45269.pdf
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Evaluating ecosystem-level anthropogenic impacts in a stressed transitional environment: The case of the Seine estuary ArchiMer
Tecchio, Samuele; Chaalali, Aurelie; Raoux, Aurore; Rius, Armonie Tous; Lequesne, Justine; Girardin, Valerie; Lassalle, Geraldine; Cachera, Marie; Riou, Philippe; Lobry, Jeremy; Dauvin, Jean-claude; Niquil, Nathalie.
During 2002–2005, a new container terminal in the commercial harbour of Le Havre, named “Port2000”, was built on the northern flank of the Seine estuary, northern France. This extension is already known to have modified the estuary current and sediment dynamics, as well as reducing biomass of the suprabenthos assemblage, for the whole downstream part of the system. However, studies on other biotic communities were largely inconclusive, and an ecosystem-wide analysis was still lacking. Here, we performed a before/after study of ecosystem dynamics of the different habitats of the Seine estuary, using a Linear Inverse Modelling technique (LIM-MCMC) to estimate all flows occurring in the food web. Ecological Network Analysis indices were calculated,...
Tipo: Text Palavras-chave: Linear inverse model; Estuarine ecosystem; Seine estuary; English Channel.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00288/39916/44274.pdf
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FISH : shapes and swimming styles ArchiMer
Cachera, Marie; Ernande, Bruno; Villanueva, Ching-maria; Baheux, Mickael; Lefebvre, Sebastien.
By covering 80% of Earth, the global ocean is the most spread ecosystem in the world. Human activities (pollution, fisheries…) have huge impacts on both oceans and marine life. Despites overfishing and intense maritime transport, many fish species remain in the English Channel. A major challenge in biological research is to comprehend and facilitate the emergence of body shape in fishes for understanding how these organisms may respond and persist in complex and multiple environments with predictable and unpredictable perturbations. Body shape in fish is conditioned by several developmental paths and functions depending on multitude behaviours. Fishes body morphology varies in every species and in some cases had been shown to influence their occurrence,...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00161/27217/25416.pdf
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How does shape affect predator- prey interactions in fish? Implications for marine food web structure and dynamics ArchiMer
Cachera, Marie; Villanueva, Ching-maria; Ernande, Bruno; Baheux, Mickael; Rouquette, Manuel; Chambord, Sophie; Lefebvre, Sebastien.
Each species pertains to a given functional niche, depending on its relationships with others species and its interactions with the abiotic environment. Understanding inter-specific interactions is critical to know and predict ecosystems' structure, functioning and dynamics, but also their response to anthropogenic impacts. Predator-prey relationship is one of the main biotic interactions as it both determines the survival of the prey and the predator and is the keystone of food webs. Unraveling the determinants of predator-prey relationships or, in other terms, the reason why a given predator catches a given prey is therefore of primary importance. Fishes are characterized by a remarkable diversity of shapes which can be associated by their feeding and...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00161/27215/25414.pdf
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Implications of morphological and functional traits for trophic relationships within fish communities and marine trophic network architecture ArchiMer
Cachera, Marie.
A current issue in ecology is to understand the contribution of biodiversity to ecosystem functioning and notably to comprehend how inter- and intra-specific trait variation affects trophic interactions between individuals and species, the trophic organization of communities and trophic network architecture. Particularly, morphology has historically been considered as a main determinant of organisms’ ecology, which led to the field of ecomorphology, and, from a functional perspective, is expected to influence trophic relationships and other ecological functions performed by species. This thesis aimed at studying the trophic organization of a marine fish community and its dependency on morphological and functional trait variation between and within species....
Tipo: Text Palavras-chave: Communauté; Morphologie; Réseau trophique; Niche; Traits fonctionnels; Manche Est; Community; Morphology; Trophic network; Niche; Functional traits; Eastern English Channel.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00195/30603/29069.pdf
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Individual diet variation in a marine fish assemblage: Optimal Foraging Theory, Niche Variation Hypothesis and functional identity ArchiMer
Cachera, Marie; Ernande, Bruno; Villanueva, Ching-maria; Lefebvre, Sebastien.
Individual diet variation (i.e. diet variation among individuals) impacts intra- and inter-specific interactions. Investigating its sources and relationship with species trophic niche organization is important for understanding community structure and dynamics. Individual diet variation may increase with intra-specific phenotypic (or “individual state”) variation and habitat variability, according to Optimal Foraging Theory (OFT), and with species trophic niche width, according to the Niche Variation Hypothesis (NVH). OFT proposes “proximate sources” of individual diet variation such as variations in habitat or size whereas NVH relies on “ultimate sources” related to the competitive balance between intra- and inter-specific competitions. The latter implies...
Tipo: Text Palavras-chave: Specialization; Trophic similarity; Size-dependent diet variation; English Channel; Semi-enclosed sea.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00349/45986/46031.pdf
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Reorganization of a marine trophic network along an inshore-offshore gradient due to stronger pelagic-benthic coupling in coastal areas ArchiMer
Kopp, Dorothee; Lefebvre, Sebastien; Cachera, Marie; Villanueva, Maria Ching; Ernande, Bruno.
Recent theoretical considerations have highlighted the importance of the pelagic-benthic coupling in marine food webs. In continental shelf seas, it was hypothesized that the trophic network structure may change along an inshore-offshore gradient due to weakening of the pelagic-benthic coupling from coastal to offshore areas. We tested this assumption empirically using the eastern English Channel (EEC) as a case study. We sampled organisms from particulate organic matter to predatory fishes and used baseline-corrected carbon and nitrogen stable isotope ratios (δ13C and δ15N) to determine their trophic position. First, hierarchical clustering on δ13C and δ15N coupled to bootstrapping and estimates of the relative contribution of pelagic and benthic carbon...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00226/33765/32191.pdf
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The mosaic of habitats of the Seine estuary: Insights from food-web modelling and network analysis ArchiMer
Tecchio, Samuele; Rius, Antonio; Dauvin, Jean-claude; Lobry, Jeremy; Lassalle, Geraldine; Morin, Jocelyne; Bacq, Nicolas; Cachera, Marie; Chaalali, Aurelie; Villanueva, Ching-maria; Niquil, Nathalie.
Ecological network analysis was applied in the Seine estuary ecosystem, northern France, integrating ecological data from the years 1996 to 2002. The Ecopath with Ecosim (EwE) approach was used to model the trophic flows in 6 spatial compartments leading to 6 distinct EwE models: the navigation channel and the two channel flanks in the estuary proper, and 3 marine habitats in the eastern Seine Bay. Each model included 12 consumer groups, 2 primary producers, and one detritus group. Ecological network analysis was performed, including a set of indices, keystoneness, and trophic spectrum analysis to describe the contribution of the 6 habitats to the Seine estuary ecosystem functioning. Results showed that the two habitats with a functioning most related to a...
Tipo: Text Palavras-chave: Trophic network; Estuary; Ecological network analysis; Ecopath with Ecosim; Food web; Ecosystem health indicators.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00270/38154/42026.pdf
Registros recuperados: 11
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