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2 rÃ©sultat(s) recherche sur le mot-clÃ© 'Benthic communities'
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Building functional groups of marine benthic macroinvertebrates on the basis of general community assembly mechanisms
article dans des revues - 2017-03
Alexandridis, Nikolaos, et al.
Titre Building functional groups of marine benthic macroinvertebrates on the basis of general community assembly mechanisms Type d'Ã©tude article dans des revues Auteurs personnes Alexandridis Nikolaos Auteur Bacher CÃ©dric Auteur Desroy Nicolas Auteur Jean Fred Auteur Date de publication 2017-03 Editeur(s) [S.l.] : Elsevier Journal of Sea Research, ISSN 1385-1101 vol.121 RÃ©sumÃ© The accurate reproduction of the spatial and temporal dynamics of marine benthic biodiversity requires the development of mechanistic models, based on the processes that shape macroinvertebrate communities. The modelled entities should, accordingly, be able to adequately represent the many functional roles that are performed by benthic organisms. With this goal in mind, we applied the emergent group hypothesis (EGH), which assumes functional equivalence within and functional divergence between groups of species. The first step of the grouping involved the selection of 14 biological traits that describe the role of benthic macroinvertebrates in 7 important community assembly mechanisms. A matrix of trait values for the 240 species that occurred in the Rance estuary (Brittany, France) in 1995 formed the basis for a hierarchical classification that generated 20 functional groups, each with its own trait values. The functional groups were first evaluated based on their ability to represent observed patterns of biodiversity. The two main assumptions of the EGH were then tested, by assessing the preservation of niche attributes among the groups and the neutrality of functional differences within them. The generally positive results give us confidence in the ability of the grouping to recreate functional diversity in the Rance estuary. A first look at the emergent groups provides insights into the potential role of community assembly mechanisms in shaping biodiversity patterns. Our next steps include the derivation of general rules of interaction and their incorporation, along with the functional groups, into mechanistic models of benthic biodiversity. CatÃ©gories thÃ©matiques benthosÃ©cosystÃ¨me benthiquedomaine benthiquemodÃ¨le de comportementestuairediversitÃ© biologique Mots-clÃ©s libres Assembly mechanisms/Benthic communities/Biological traits/Emergent groups/estuaire de la Rance/estuary/flore benthique/Functional diversity/Functional redundancy Echelle de territoire bassins versants Bassin(s) versant(s) Rance - Faluns Note DOI = 10.1016/j.seares.2017.01.007 Langue(s) Anglais Format p59 Ã p70 Document en ligne https://www.sciencedirect.com/science/article/pii/S1385110116300508 NÂ° d'Ã©dition (ISBN, DOI,...) 10.1016/j.seares.2017.01.007 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=159810Impact of the Phaeocystis globosa spring bloom on the intertidal benthic compartment in the eastern English Channel: a synthesis.
article scientifique - 2009
Spilmont, Nicolas, et al.
Titre Impact of the Phaeocystis globosa spring bloom on the intertidal benthic compartment in the eastern English Channel: a synthesis. Type d'Ã©tude article scientifique Auteurs personnes Spilmont, Nicolas Auteur Luczak, Christophe Auteur Lemoine, Yves Auteur Janquin, Marie-AndrÃ©e Auteur Hubas, CÃ©dric Auteur Hacquebart, Pascal Auteur Gevaert Francois Auteur Desroy Nicolas Auteur CrÃ©ach, Anne Auteur Courcot, Lucie Auteur et al. Date de publication 2009 Editeur(s) [S.l.] : s. n. Revue scientifique Marine Pollution Bulletin RÃ©sumÃ© From 1999 to 2005, studies carried out in the frame of regional and national French programs aimed to determine whether the Phaeocystis globosa bloom affected the intertidal benthic communities of the French coast of the eastern English Channel in terms of composition and/or functioning. Study sites were chosen to cover most of the typical shore types encountered on this coast (a rocky shore, an exposed sandy beach and a small estuary). Both the presence of active Phaeocystis cells and their degradation product (foam) did have a significant impact on the studied shores. The primary production and growth rates of the kelp Saccharina latissima decreased during the bloom because of a shortage of light and nutrient for the macroalgae. On sandy sediments, the benthic metabolism (community respiration and community primary production), as well as the nitrification rate, were enhanced during foam deposits, in relation with the presence of bacteria and active pelagic cells within the decaying colonies. In estuarine sediments, the most impressive impact was the formation of a crust at the sediment surface due to drying foam. This led to anoxic conditions in the surface sediment and resulted in a high mortality among the benthic community. Some organisms also tended to migrate upward and were then directly accessible to the higher trophic level represented by birds. Phaeocystis then created a shortcut in the estuarine trophic network. Most of these modifications lasted shortly and all the systems considered came back to their regular properties and activities a few weeks after the end of the bloom, except for the most impacted estuarine area. CatÃ©gories thÃ©matiques alguebenthos Mots-clÃ©s libres [SDV:EE:IEO] Life Sciences/Ecology/environment/Symbiosis/[SDE:BE] Environmental Sciences/Biodiversity and Ecology/Phaeocystis globosa/bloom/Ecosystem/intertidal/benthic communities/English Channel Echelle de territoire rÃ©gion (ou supra) Langue(s) Anglais NÂ° d'Ã©dition (ISBN, DOI,...) 10.1016/j.marpolbul.2008.09.007 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=17092