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Collection Journal of Sea Research
- Editeur : Elsevier
- ISSN : 1385-1101
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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'Ă©tude article dans des revues Auteurs personnes Alexandridis Nikolaos Auteur Bacher CĂ©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 RĂ©sumĂ© 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. CatĂ©gories thĂ©matiques benthosĂ©cosystĂ¨me benthiquedomaine benthiquemodĂ¨le de comportementestuairediversitĂ© biologique Mots-clĂ©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 Ă p70 Document en ligne https://www.sciencedirect.com/science/article/pii/S1385110116300508 NÂ° d'Ă©dition (ISBN, DOI,...) 10.1016/j.seares.2017.01.007 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=159810Exploitation of intertidal feeding resources by the Red Knot Calidris canutus under megatidal conditions (Bay of Saint-Brieuc, France)
article scientifique - 2015-02
Sturbois, Anthony, et al.
Titre Exploitation of intertidal feeding resources by the Red Knot Calidris canutus under megatidal conditions (Bay of Saint-Brieuc, France) Type d'Ă©tude article scientifique Auteurs personnes Sturbois, Anthony Auteur Ponsero, Alain Auteur Desroy Nicolas Auteur Le Mao Patrick Auteur Voir la fiche partenaire sur bretagne-environnement.org: Fournier, JĂ©rĂ´me Auteur Date de publication 2015-02 Editeur(s) [S.l.] : Elsevier Revue scientifique Journal of Sea Research, ISSN 1385-1101 RĂ©sumĂ© The feeding ecology of the red knot has been widely studied across its wintering range. Red knots mainly select bivalves and gastropods, with differences between sites due to variation in prey availability. Shorebirdâ€™s diet is also influenced or controlled by the tidal regime. The aim of this paper is to demonstrate the adaptation of foraging red knots to the megatidal environment. The variation in their diet during tidal cycles was studied in the bay of Saint-Brieuc, a functional unit for this species. The method used combined macrofauna, distribution of foraging birds and diet data. Comparative spatial analyses of macrofauna and distribution of foraging red knots have shown that the bay's four benthic assemblages are exploited by birds. By analysing droppings, we highlighted that bivalve molluscs are the main component of their diet, as shown in most overwintering sites. Fifteen types of prey were identified and Donax vittatus was discovered to be a significant prey item. The relative proportion of each main prey item differs significantly depending on the benthic assemblage used to forage. All available benthic assemblages and all potential feeding resources can be used during a single tidal cycle, reflecting an adaptation to megatidal conditions. This approach develops accurate knowledge about the feeding ecology of birds which managers need in order to identify optimal areas for the conservation of waders based on the areas and resources actually used by the birds. CatĂ©gories thĂ©matiques marĂ©eoiseau Mots-clĂ©s libres EN Echelle de territoire baies et rades Note Journal Of Sea Research (1385-1101) (Elsevier Science Bv), 2015-02 , Vol. 96 , P. 23-30 Langue(s) Anglais Format Journal Of Sea Research (1385-1101) (Elsevier Science Bv), 2015-02 , Vol. 96 , P. 23-30 Document en ligne http://archimer.ifremer.fr/doc/00226/33767/ Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=148622A theoretical individual-based model of Brown Ring Disease in Manila clams, Venerupis philippinarum
article scientifique - 2014-08
Paillard, Christine, et al.
Titre A theoretical individual-based model of Brown Ring Disease in Manila clams, Venerupis philippinarum Type d'Ă©tude article scientifique Auteurs personnes Paillard Christine Auteur Jean Fred Auteur Ford Susan E. Auteur Powell Eric N. Auteur Klinck John M. Auteur Hofmann Eileen E. Auteur Flye-Sainte-Marie Jonathan Auteur Date de publication 2014-08 Editeur(s) [S.l.] : Elsevier Revue scientifique Journal of Sea Research, ISSN 1385-1101 Volume 91, Pages 15â€“34 RĂ©sumĂ© An individual-based mathematical model was developed to investigate the biological and environmental interactions that influence the prevalence and intensity of Brown Ring Disease (BRD), a disease, caused by the bacterial pathogen, Vibrio tapetis, in the Manila clam (Venerupis (= Tapes, = Ruditapes) philippinarum). V. tapetis acts as an external microparasite, adhering at the surface of the mantle edge and its secretion, the periostracal lamina, causing the symptomatic brown deposit. Brown Ring Disease is atypical in that it leaves a shell scar that provides a unique tool for diagnosis of either live or dead clams. The model was formulated using laboratory and field measurements of BRD development in Manila clams, physiological responses of the clam to the pathogen, and the physiology of V. tapetis, as well as theoretical understanding of bacterial disease progression in marine shellfish. The simulation results obtained for an individual Manila clam were expanded to cohorts and populations using a probability distribution that prescribed a range of variability for parameters in a three dimensional framework; assimilation rate, clam hemocyte activity rate (the number of bacteria ingested per hemocyte per day), and clam calcification rate (a measure of the ability to recover by covering over the symptomatic brown ring deposit), which sensitivity studies indicated to be processes important in determining BRD prevalence and intensity. This approach allows concurrent simulation of individuals with a variety of different physiological capabilities (phenotypes) and hence by implication differing genotypic composition. Different combinations of the three variables provide robust estimates for the fate of individuals with particular characteristics in a population that consists of mixtures of all possible combinations. The BRD model was implemented using environmental observations from sites in Brittany, France, where Manila clams routinely exhibit BRD signs. The simulated annual cycle of BRD prevalence and intensity agrees with observed disease cycles in cultured clam populations from this region, with maximum disease prevalence and intensity occurring from December to April. Sensitivity analyses of modeled physiological processes showed that the level of hemocyte activity is the primary intrinsic determinant of recovery of infected clams. Simulations designed to investigate environmental effects on BRD suggested that the outcome of the host-parasite interaction is dependent on food supply (high values being favourable for the host) and temperature. Results of simulations illustrate the complex interaction of temperature effects on propagation and viability of the bacterium, on the phagocytic activity of the hemocytes, and on other physiological processes of the host clam. Simulations using 1o C and 2o C increases in temperature generally favored disease development, indicating that climate warming might favor the spread of BRD. CatĂ©gories thĂ©matiques mollusquesantĂ© publiquesurveillance Mots-clĂ©s libres bacteria/BRD/host-parasite-environment/Manila clam/numerical model/Vibrio tapetis Echelle de territoire rĂ©gion (ou supra) Langue(s) Anglais Document en ligne http://dx.doi.org/10.1016/j.seares.2014.03.005 NÂ° d'Ă©dition (ISBN, DOI,...) 10.1016/j.seares.2014.03.005 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=19289Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries
article scientifique - 2014-07
Blanchet, Hugues, et al.
Titre Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries Type d'Ă©tude article scientifique Auteurs personnes Blanchet Hugues Auteur Gouillieux BenoĂ®t Auteur Alizier Sandrine Auteur Amouroux Jean-Michel Auteur Bachelet Guy Auteur BarillĂ© Anne-Laure Auteur Dauvin Jean-Claude Auteur de Montaudouin Xavier Auteur Derolez ValĂ©rie Auteur Desroy Nicolas Auteur et al. Date de publication 2014-07 Editeur(s) [S.l.] : Elsevier Revue scientifique Journal of Sea Research, ISSN 1385-1101 Vol. 90, pp. 95-110 RĂ©sumĂ© Based on a parallel sampling conducted during autumn 2008, a comparative study of the intertidal benthic macrofauna among 10 estuarine systems located along the Channel and Atlantic coasts of France was performed in order to assess the level of fauna similarity among these sites and to identify possible environmental factors involved in the observed pattern at both large (among sites) and smaller (benthic assemblages) scales. More precisely this study focused on unraveling the observed pattern of intertidal benthic fauna composition and diversity observed at among-sites scale by exploring both biotic and abiotic factors acting at the among- and within-site scales. Results showed limited level of similarity at the among-site level in terms of intertidal benthic fauna composition and diversity. The observed pattern did not fit with existing transitional water classification methods based on fish or benthic assemblages developed in the frame of the European Water Framework Directive (WFD). More particularly, the coastal plain estuaries displayed higher among-sites similarity compared to ria systems. These coastal plain estuaries were characterized by higher influence of river discharge, lower communication with the ocean and high suspended particulate matter levels. On the other hand, the ria-type systems were more dissimilar and different from the coastal plain estuaries. The level of similarity among estuaries was mainly linked to the relative extent of the intertidal â€śScrobicularia plana-Cerastoderma eduleâ€ť and â€śTellina tenuisâ€ť or â€śVenusâ€ť communities as a possible consequence of salinity regime, suspended matter concentrations and fine particles supply with consequences on the trophic functioning, structure and organization of benthic fauna. Despite biogeographical patterns, the results also suggest that, in the context of the WFD, these estuaries should only be compared on the basis of the most common intertidal habitat occurring throughout all estuarine systems and that the EUNIS biotope classification might be used for this purpose. In addition, an original inverse relation between Îł-diversity and area was shown; however, its relevance might be questioned. CatĂ©gories thĂ©matiques benthosestuaire Mots-clĂ©s libres diversity/estuaries/macrozoobenthos/structuring factors/WFD Echelle de territoire rĂ©gion (ou supra) Langue(s) Anglais Document en ligne http://dx.doi.org/10.1016/j.seares.2014.02.014 NÂ° d'Ă©dition (ISBN, DOI,...) 10.1016/j.seares.2014.02.014 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=19283Benthic control freaks: Effects of the tubiculous amphipod Haploops nirae on the specific diversity and functional structure of benthic communities
article dans des revues - 2014-01
RIGOLET, Carinne, et al.
Titre Benthic control freaks: Effects of the tubiculous amphipod Haploops nirae on the specific diversity and functional structure of benthic communities Type d'Ă©tude article dans des revues Auteurs personnes RIGOLET Carinne Auteur Dubois Stanislas F. Auteur ThiĂ©baut Eric Auteur Date de publication 2014-01 Editeur(s) [S.l.] : Elsevier Journal of Sea Research, ISSN 1385-1101 RĂ©sumĂ© Haploops nirae is a gregarious tubiculous amphipod which extended its habitat over thousands of hectares in shallow waters of South Brittany bays (Bay of Biscay, Atlantic) over the last decades and created uniquely large and dense tube mats. In the bay of Concarneau, we investigated the specific diversity (i.e. species richness and species composition) and the functional structure (using biological traits) of the macrofauna associated with this Haploops community as a comparison with several surrounding soft-sediment communities to determine the effect of this engineer species on ecosystem functions. We showed that the occurrence of Haploops tubes and individuals significantly modifies sediment features (e.g. change in sediment grain size, increase in C and N organic content) but also largely affect species diversity and benthic composition. The species richness was significantly higher in Haploops community but the species assemblage associated with Haploops habitat was very homogeneous compared to the neighboring habitats and unique with 33% of all species exclusively found in this community. Multivariate analysis (dbRDA) revealed that Haploops density was by far the factor explaining the variation in species composition of benthic communities. No differences in species diversity and assemblage were detected in relationship to Haploops density. A biological trait analysis performed on the whole ecosystem (Haploops included) revealed that Haploops largely dominates the functional structure of the Haploops community by its own functional traits. When performed on selected traits of the associated fauna only (Haploops excluded) the functional structure of the Haploops community was characterized by a greatly reduced proportion of small to medium long lived, sensitive to disturbance, free living or burrowing/tube-building filter-feeding species. H. nirae appears to be a bioengineer and a foundation species that largely modifies its hydro-sedimentary features, controlling diversity and abundances of associated species, and creating a complex set of positive and negative interactions so that a unique benthic assemblage is found in sediments they colonized. CatĂ©gories thĂ©matiques biologie marineĂ©cosystĂ¨me benthique Mots-clĂ©s libres Journal articles/Life Sciences [q-bio]/UniversitĂ© Pierre et Marie Curie/CNRS - Centre national de la recherche scientifique/IFREMER - Institut franĂ§ais de recherche pour l'exploitation de la mer/GIP Bretagne Environnement/Adaptation et DiversitĂ© en Milieu Marin Echelle de territoire rĂ©gion (ou supra) Langue(s) Anglais Document en ligne https://tel.archives-ouvertes.fr/IFREMER/hal-01140607v1 Permalink http://etudes.bretagne-environnement.org/index.php?lvl=notice_display&id=149311Temporal stability of a coarse sediment community in the Central Eastern English Channel Paleovalleys
article scientifique - 2012
Lozach, Sophie, et al.
PermalinkSpatial patterns in suprabenthic communities in the English Channel
article scientifique - 2011
Dauvin, Jean-claude, et al.
PermalinkGrowth of the European abalone (Haliotis tuberculata L.) in situ: Seasonality and ageing using stable oxygen isotopes
article scientifique - 2011
Roussel, Sabine, et al.
PermalinkDifferential response of benthic macrofauna to the formation of novel oyster reefs (Crassostrea gigas, Thunberg) on soft and rocky substrate in the intertidal of the Bay of Brest, France
rapport / Ă©tude - 2011
Lejart, Morgane, et al.
PermalinkImpact of warming on abundance and occurrence of flatfish populations in the Bay of Biscay (France)
article dans des revues - 2010
Hermant, Marie, et al.
PermalinkEffect of nursery habitat degradation on flatfish population: Application to Solea solea in the Eastern Channel (Western Europe)
article scientifique - 2010
Mackinson, S., et al.
PermalinkDynamics of an estuarine nursery ground: the spatio-temporal relationship between the river flow and the food web of the juvenile common sole (Solea solea, L.) as revealed by stable isotopes analysis
article scientifique - 2010
Le Bris, HervĂ©, et al.