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Modelling larval dispersal and settlement of the reef-building polychaete Sabellaria alveolata: Role of hydroclimatic processes on the sustainability of biogenic reefs ArchiMer
Ayata, Sakina-dorothee; Ellien, Celine; Dumas, Franck; Dubois, Stanislas; Thiebaut, Eric.
The honeycomb worm Sabellaria alveolata forms biogenic reefs which constitute diversity hotspots on tidal flats. The largest known reefs in Europe, located in the Bay of Mont-Saint-Michel (English Channel), are suffering increasing anthropogenic disturbances which raise the question of their sustainability. As the ability to recover depends partly on the recolonization of damaged reefs by larval supply, evaluating larval dispersal and the connectivity between distant reefs is a major challenge for their conservation. In the present study, we used a 3D biophysical model to simulate larval dispersal under realistic hydroclimatic conditions and estimate larval retention and exchanges among the two reefs of different sizes within the bay. The model takes into...
Tipo: Text Palavras-chave: Bay of Mont Saint Michel; English Channel; Modelling; Larval settlement; Larval transport; Connectivity; Biogenic reefs; Sabellaria alveolata.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6841.pdf
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Biophysical modelling to investigate the effects of climate change on marine population dispersal and connectivity ArchiMer
Lett, Christophe; Ayata, Sakina-dorothee; Huret, Martin; Irisson, Jean-olivier.
Climate may act on the dispersal and connectivity of marine populations through changes in the oceanic circulation and temperature, and by modifying species' prey and predator distributions. As dispersal and connectivity remain difficult to assess in situ, a first step in studying the effects of climate change can be achieved using biophysical models. To date, only a few biophysical models have been used for this purpose. Here we review these studies and also include results from other recent modelling efforts. We show that increased sea temperature, a major change expected under climate warming, may impact dispersal and connectivity patterns via changes in reproductive phenology (e.g., shift in the spawning season), transport (e.g., reduced pelagic larval...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00031/14176/11522.pdf
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How does the connectivity between populations mediate range limits of marine invertebrates? A case study of larval dispersal between the Bay of Biscay and the English Channel (North-East Atlantic) ArchiMer
Ayata, Sakina-dorothee; Lazure, Pascal; Thiebaut, Eric.
For many marine species, larval dispersal plays a crucial role in population persistence, re-colonization of disturbed areas, and distribution of species range limits through the control of population connectivity. Along the French Atlantic coast (NE Atlantic), a biogeographical transition zone has been reported between temperate and cold-temperate marine faunal assemblages. Hydrodynamics in this area are highly complex and variable including numerous mesoscale features (e.g. river plumes, fronts, upwellings, low salinity lenses), which could constrain larval transport and connectivity. In this context, the aim of this study was to assess how hydrodynamic conditions and biological traits influence larval transport and contribute to population connectivity...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00030/14174/11506.pdf
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Meroplankton distribution and its relationship to coastal mesoscale hydrological structure in the northern Bay of Biscay (NE Atlantic) ArchiMer
Ayata, Sakina-dorothee; Stolba, Robin; Comtet, Thierry; Thiebaut, Eric.
The relationship between meroplankton distribution and spatio-temporal variability of coastal mesoscale hydrological structure was investigated in the northern Bay of Biscay, North-East Atlantic. For the three coastal polychaetes studied, i.e. Pectinaria koreni, Owenia fusiformis and Sabellaria alveolata, the highest larval abundances were sampled in low-salinity, low-density and high-temperature river plume waters. For two species (P. koreni and O. fusiformis), maximal abundances were observed in the surface and thermocline layers due to ontogenic migrations. Variance partitioning based on multiple regression and redundancy analyses was used to assess the relative roles played by the hydrological environment alone, the geographical space alone and their...
Tipo: Text Palavras-chave: Meroplankton; Larval transport; Mesoscale structures; River plume; Fronts; Owenia fusiformis; Pectinaria koreni; Sabellaria alveolata; Bay of Biscay.
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00240/35131/33632.pdf
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Mare Incognitum: A Glimpse into Future Plankton Diversity and Ecology Research ArchiMer
Chust, Guillem; Vogt, Meike; Benedetti, Fabio; Nakov, Teofil; Villeger, Sebastien; Aubert, Anais; Vallina, Sergio M.; Righetti, Damiano; Not, Fabrice; Biard, Tristan; Bittner, Lucie; Benoiston, Anne-sophie; Guidi, Lionel; Villarino, Ernesto; Gaborit, Charlie; Cornils, Astrid; Buttay, Lucie; Irisson, Jean-olivier; Chiarello, Marlene; Vallim, Alessandra L.; Blanco-bercial, Leocadio; Basconi, Laura; Guilhaumon, Francois; Ayata, Sakina-dorothee.
With global climate change altering marine ecosystems, research on plankton ecology is likely to navigate uncharted seas. Yet, a staggering wealth of new plankton observations, integrated with recent advances in marine ecosystem modeling, may shed light on marine ecosystem structure and functioning. A EuroMarine foresight workshop on the “Impact of climate change on the distribution of plankton functional and phylogenetic diversity” (PlankDiv) identified five grand challenges for future plankton diversity and macroecology research: (1) What can we learn about plankton communities from the new wealth of high-throughput “omics” data? (2) What is the link between plankton diversity and ecosystem function? (3) How can species distribution models be adapted to...
Tipo: Text Palavras-chave: Plankton; Macroecology; Species distribution; Functional diversity; Climate change; Habitat modeling.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00625/73739/74755.pdf
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Regionalisation of the Mediterranean basin, a MERMEX synthesis ArchiMer
Ayata, Sakina-dorothee; Irisson, Jean-olivier; Aubert, Anais; Berline, Leo; Dutay, Jean-claude; Mayot, Nicolas; Nieblas, Anne-elise; D'Ortenzio, Fabrizio; Palmieri, Julien; Reygondeau, Gabriel; Rossi, Vincent; Guieu, Cecile.
Regionalisation aims at delimiting provinces within which physical conditions, chemical properties, and biological communities are reasonably homogeneous. This article proposes a synthesis of the many recent regionalisations of the open-sea regions of the Mediterranean Sea. The nine studies considered here defined regions based on different, and sometimes complementary, criteria: dynamics of surface chlorophyll concentration, ocean currents, three-dimensional hydrological and biogeochemical properties, or the distribution of organisms. Although they identified different numbers and patterns of homogeneous regions, their compilation in the epipelagic zone identifies nine consensus frontiers, eleven consensus regions with relatively homogeneous conditions,...
Tipo: Text Palavras-chave: Mediterranean Sea; Regionalisation; Biogeochemistry; Circulation; Mesoscale features; Epipelagic ocean; Management; Spatial planning.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00405/51673/52221.pdf
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Investigating uncertainties in zooplankton composition shifts under climate change scenarios in the Mediterranean Sea ArchiMer
Benedetti, Fabio; Guilhaumon, Francois; Adloff, Fanny; Ayata, Sakina-dorothee.
Ensemble niche modelling has become a common framework to predict changes in assemblages composition under climate change scenarios. The amount of uncertainty generated by the different components of this framework has rarely been assessed. In the marine realm forecasts have usually focused on taxa representing the top of the marine food-web, thus overlooking their basal component: the plankton. Calibrating environmental niche models at the global scale, we modelled the habitat suitability of 106 copepod species and estimated the dissimilarity between present and future zooplanktonic assemblages in the surface Mediterranean Sea. We identified the patterns (species replacement versus nestedness) driving the predicted dissimilarity, and quantified the...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00425/53613/75049.pdf
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Climate change may have minor impact on zooplankton functional diversity in the Mediterranean Sea ArchiMer
Benedetti, Fabio; Ayata, Sakina-dorothee; Irisson, Jean-olivier; Adloff, Fanny; Guilhaumon, Francois.
Aim To assess the impact of climate change on the functional diversity of marine zooplankton communities. Location The Mediterranean Sea. Methods We used the functional traits and geographic distributions of 106 copepod species to estimate the zooplankton functional diversity of Mediterranean surface assemblages for the 1965-1994 and 2069-2098 periods. Multiple environmental niche models were trained at the global scale to project the species habitat suitability in the Mediterranean Sea and assess their sensitivity to climate change predicted by several scenarios. Simultaneously, the species traits were used to compute a functional dendrogram from which we identified seven functional groups and estimated functional diversity through Faith's index. We...
Tipo: Text Palavras-chave: Climate change; Functional diversity; Mediterranean Sea; Niche modelling; Null model; Zooplankton.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60118/63460.pdf
Registros recuperados: 8
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