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| Registros recuperados: 12 | |
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| 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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| Blanchard, Fabian; Le Loc'H, Francois; Hily, Christian; Boucher, Jean. |
| Within the framework of the 'dynamic equilibrium model', we tested the hypothesis that fishing causes major disturbance to benthic communities on deeper bottoms of the continental shelf. Benthic megafauna on the Bay of Biscay coast of France was sampled on fishing grounds subject to various conditions of exploitation. Samples were taken at around 100 m depth to avoid strong natural disturbances. Species diversity and the largest body mass class of invertebrates were smaller in strongly exploited areas than in moderately exploited ones. Biomass size spectra in strongly exploited areas were characterised by a comparatively large biomass of small invertebrates, hence the K-dominance curve of abundance was either above the biomass curve, or the curves... |
| Tipo: Text |
Palavras-chave: Benthic communities; Community dynamics; Disturbance; Diversity; Size spectrum. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00000/10896/7578.pdf |
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| 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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| Shaiek, Moez; Romdhane, Mohamed Salah; Le Loc'H, Francois. |
| In order to define the structure of trophic network of Ichkeul Lake in Tunisia, diet of main teleost fish species was determined during two seasons, wet and dry. A total of 491 stomachs from 16 teleost species was analyzed. The analysis revealed spatial variability (East under marine influence and West with more continental effect) and temporal one (wet and dry seasons). Based on stomach contents, nine trophic groups were revealed, including eight monospecific groups. The main prey are mudflat snails (Hydrobia ventrosa, H. acuta), bivalves (Abra alba, Cerastoderma glaucum), amphipods and isopods, as well as seagrass (Potamogeton pectinatus, Ruppia cirrhosa) and water brackish algae (Ulva spp. and Chaetomorpha spp., Cladophora sp., Polysiphonia sp.). |
| Tipo: Text |
Palavras-chave: Ichthyofauna; Tunisia; Ichkeul Lake; Stomach contents; Prey; Diet; Trophic group. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00294/40541/73188.pdf |
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| Wahbi, Fatima; Le Loc'H, Francois; Berreho, Amina; Benazzouz, Aissa; Ben Mhmed, Abdelouahed; Errhif, Ahmed. |
| A study of the diet of the Atlantic horse mackerel Trachurus trachurus (Linnaeus, 1758) was carried out on the Atlantic coast of Southern Morocco, located from Cap Boujdour to Cap Blanc (26 degrees 30'N-21 degrees N latitude). This area is characterized by a permanent upwelling and is among the highly productive ecosystems of the worldwide ocean. The diet of T. trachurus was studied through qualitative and quantitative analysis of stomach contents. Samples were collected during the warm (June-July-August) and the cold seasons (November-December) in 2007 and 2008. Acoustic surveys were carried out on board of the Moroccan Amir Moulay Abdellah and the Russian Atlantida oceanographic vessels. A total of 456 stomachs were analyzed, exhibiting a diversified... |
| Tipo: Text |
Palavras-chave: Carangidae; Trachurus trachurus; Atlantic; Morocco; Diet. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00275/38652/73175.pdf |
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| Albouy, Camille; Mouillot, David; Rocklin, Delphine; Culioli, Jean M.; Le Loc'H, Francois. |
| Marine protected areas (MPAs) have the potential to enhance the long-term sustainability of coastal resources, and the artisanal fisheries which depend on them. However, recreational fisheries, which are increasing their impacts on coastal resources worldwide, may reduce the benefits that MPAs provide to declining artisanal fisheries. Here we used the Bonifacio Straits Natural Reserve (BSNR) Corsica as a study case to simulate the combined effects on coastal resources of artisanal and recreational fishing efforts. The BSNR ecosystem was modelled using mass-balance modelling of trophic interactions. This model was compared to another built on a non-protected area from the same region. We aggregated fishing fleets into artisanal and recreational categories,... |
| Tipo: Text |
Palavras-chave: Ecopath with Ecosim; Epinephelus marginatus; MPA; Trophic cascades; Artisanal fisheries; Recreational activities; Mediterranean Sea. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00013/12436/9246.pdf |
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| Le Croizier, Gael; Schaal, Gauthier; Point, David; Le Loc'H, Francois; Machu, Eric; Fall, Massal; Munaron, Jean-marie; Boye, Aurelien; Walter, Pierre; Lae, Raymond; De Morais, Luis Tito. |
| Bioaccumulation of toxic metal elements including mercury (Hg) can be highly variable in marine fish species. Metal concentration is influenced by various species-specific physiological and ecological traits, including individual diet composition and foraging habitat. The impact of trophic ecology and habitat preference on Hg accumulation was analyzed through total Hg concentration and stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) analyses in the muscle of 132 fish belonging to 23 different species from the Senegalese coast (West Africa), where the marine ecosystem is submitted to nutrients inputs from various sources such as upwelling or rivers. Species-specific ecological traits were first investigated and results showed that vertical (i.e.... |
| Tipo: Text |
Palavras-chave: Methylmercury sources; Trophic ecology; Feeding habitat; Metal bioaccumulation; Chemical tracers; Isotopic niche. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00458/57013/58912.pdf |
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| Lira, Alex; Angelini, Ronaldo; Le Loc'H, Francois; Menard, Frederic; Lacerda, Carlos; Fredou, Thierry; Fredou, Flavia Lucena. |
| We developed an Ecopath model in the Estuary of Sirinhaém River (SIR), a small-sized system surrounded by mangroves, subject to high impact, mainly by sugar cane industry and other farming industries in order to describe the food web structure and trophic interactions. In addition, we compared our findings with those of 20 available Ecopath estuarine models for tropical, subtropical and temperate regions, aiming to synthesize the knowledge on trophic dynamics and provide a comprehensive analysis of the structures and functioning of estuaries. Our model consisted of 25 compartments and its indicators were within the expected range for estuarine areas around the world. The average trophic transfer efficiency for the entire system was 11.8%, similar to the... |
| Tipo: Text |
Palavras-chave: Tropical estuary; Ecopath; Food web; Global comparison of ecological indicators. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00428/53929/55061.pdf |
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| Le Croizier, Gael; Schaal, Gauthier; Gallon, Regis; Fall, Massal; Le Grand, Fabienne; Munaron, Jean-marie; Rouget, Marie-laure; Machu, Eric; Le Loc'H, Francois; Lae, Raymond; De Morais, Luis Tito. |
| The link between trophic ecology and metal accumulation in marine fish species was investigated through a multi-tracers approach combining fatty acid (FA) and stable isotope (SI) analyses on fish from two contrasted sites on the coast of Senegal, one subjected to anthropogenic metal effluents and another one less impacted. The concentrations of thirteen trace metal elements (As, Cd, Co, Cr, Cu, Fe, Li, Mn, Ni, Pb, Sn, U, and Zn) were measured in fish liver. Individuals from each site were classified into three distinct groups according to their liver FA and muscle SI compositions. Trace element concentrations were tested between groups revealing that bioaccumulation of several metals was clearly dependent on the trophic guild of fish. Furthermore,... |
| Tipo: Text |
Palavras-chave: Trace elements; Biochemical tracers; Diet; Contamination; Senegal; Tropical fish. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00348/45908/45707.pdf |
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| Carlier, Antoine; Chauvaud, Laurent; Van Der Geest, Matthijs; Le Loc'H, Francois; Le Duff, Michel; Vernet, Marc; Raffray, Jean; Diakhate, Djibril; Labrosse, Pierre; Wague, Abdoulaye; Le Goff, Clement; Gohin, Francis; Chapron, Bertrand; Clavier, Jacques. |
| Banc d’Arguin (BA), Mauritania, is a nationally protected shallow gulf > 10,000 km2 between the Sahara desert and the upwelling system off the Mauritanian coast. In the southeast, BA consists of a 500 km2 tidal flat, the most important wintering site for shorebirds using the East Atlantic Flyway. The Mauritanian upwelling-driven phytoplankton production supports the most productive fisheries worldwide, but little is known about its trophic role in the functioning of the inshore BA food web. Using stable isotopes as trophic tracers to distinguish between upwelling-driven phytoplankton, open ocean phytoplankton, and benthic primary producers, we assessed the spatial extent to which the inshore BA food web is fuelled by upwelling-driven phytoplankton... |
| Tipo: Text |
Palavras-chave: Banc d'Arguin; West Africa; Food web structure; Remote sensing; Stable isotope; Upwelling. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00269/37999/36078.pdf |
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| Registros recuperados: 12 | |
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