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RÃ©sultat de la recherche
2 rÃ©sultat(s) recherche sur le mot-clÃ© 'flore benthique'
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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=159810Environmental factors affecting maerl bed structure in Brittany (France)
article dans des revues - 2015
Dutertre, MickaÃ«l, et al.
Titre Environmental factors affecting maerl bed structure in Brittany (France) Type d'Ã©tude article dans des revues Auteurs personnes Dutertre MickaÃ«l Auteur Grall Jacques Auteur Ehrhold Axel Auteur Hamon Dominique Auteur Date de publication 2015 Editeur(s) [S.l.] : British Phycological Society
[S.l.] : Taylor & Francis
European Journal of Phycology, ISSN 0967-0262 vol.50 nÂ°4 RÃ©sumÃ© Â© rÃ©sumÃ© auteurs :
"This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate concentration and annual mean current velocity, while the variation in the proportion of living thalli can best be explained (correlation = 0.47) by a combination of depth and mud content. Linear relationships showed that the percentage cover of maerl thalli was positively correlated with nitrate concentration (R2 = 0.78, P < 0.01) and negatively correlated with salinity (R2 = 0.81, P < 0.01), suggesting a strong effect of estuarine discharge on maerl bed structure, and also negatively correlated with current velocity (R2 = 0.81, P < 0.01). When maerl beds were deeper than 10 m, the proportion of living thalli was always below 30% but when they were shallower than 10 m, it varied between 4 and 100%, and was negatively correlated with mud content (R2 = 0.53, P < 0.01). On the other hand, when mud content was below 10%, the proportion of living thalli showed a negative correlation with depth (R2 = 0.84, P < 0.01). This large spatial scale explanation of maerl bed heterogeneity provides a realistic physical characterization of these ecologically interesting benthic habitats and usable findings for their conservation and management."
CatÃ©gories thÃ©matiques estuairebenthosdomaine benthiqueÃ©cosystÃ¨me benthiqueflore Mots-clÃ©s libres Benthic habitats/Brittany/environmental factors/estuary/flore benthique/large spatial scale/maerl/maÃ«rl/facteur environnemental/facteurs environnementaux/habitat benthique Echelle de territoire rÃ©gion (ou supra) Note DOI = 10.1080/09670262.2015.1063698
Notice sur le site Ã©diteur Taylor & Francis = http://dx.doi.org/10.1080/09670262.2015.1063698
Notice Archimer = http://archimer.ifremer.fr/doc/00280/39089/
Document en texte intÃ©gral = http://archimer.ifremer.fr/doc/00280/39089/37816.pdf
Langue(s) Anglais Format pp371-383 Document en ligne http://archimer.ifremer.fr/doc/00280/39089/ Localisation du document http://archimer.ifremer.fr/doc/00280/39089/37816.pdf NÂ° d'Ã©dition (ISBN, DOI,...) 10.1080/09670262.2015.1063698 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=158086