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Auteur Collos, Y.; Jauzein, C.; Hatey, E. url  doi
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  Titre Particulate carbon and nitrogen determinations in tracer studies: The neglected variables Type Article scientifique
  Année 2014 Publication Applied Radiation and Isotopes Revue Abrégée  
  Volume (down) 94 Numéro Pages 14-22  
  Mots-Clés Suspended particulate matter; Carbon; Nitrogen; Adsorption; Material loss; Phytoplankton  
  Résumé Abstract

We address two issues in the determination of particulate carbon and nitrogen in suspended matter of aquatic environments. One is the adsorption of dissolved organic matter on filters, leading to overestimate particulate matter. The second is the material loss during filtration due to fragile algal cells breaking up. Examples from both laboratory cultures and natural samples are presented. We recommend using stacked filters in order to estimate the first and filtering different volumes of water in order to evaluate the second.
 
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  ISSN 0969-8043 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1318  
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Auteur LELIEVRE, S.; VAZ, S.; Martin, C.S.; LOOTS, C. url  openurl
  Titre Delineating recurrent fish spawning habitats in the North Sea Type Article scientifique
  Année 2014 Publication Revue Abrégée Journal Of Sea Research  
  Volume (down) 91 Numéro Pages 1-14  
  Mots-Clés Egg Distribution; Glm; Habitat Modelling; North sea; Spawning Grounds; temporal variability  
  Résumé The functional value of spawning habitats makes them critically important for the completion of fish life cycles and spawning grounds are now considered to be “essential habitats”. Inter-annual fluctuations in spawning ground distributions of dab (Limanda Limanda), plaice (Pleuronectes platessa), cod (Gadus morhua) and whiting (Merlangius merlangus) were investigated in the southern North Sea and eastern English Channel, from 2006 to 2009. The preferential spawning habitats of these species were modelled using generalised linear models, with egg distribution being used as proxy of spawners’ location. Egg spatial and temporal distributions were explored based on six environmental variables: sea surface temperature and salinity, chlorophyll a concentration, depth, bedstress and seabed sediment types. In most cases, egg density was found to be strongly related to these environmental variables. Egg densities were positively correlated with shallow to intermediate depths having low temperature and relatively high salinity. Habitat models were used to map annual, i.e. 2006 to 2009, winter spatial distributions of eggs, for each species separately. Then, annual maps were combined to explore the spatial variability of each species' spawning grounds, and define recurrent, occasional, rare and unfavourable spawning areas. The recurrent spawning grounds of all four species were located in the south-eastern part of the study area, mainly along the Dutch and German coasts. This study contributes knowledge necessary to the spatial management of fisheries resources in the area, and may also be used to identify marine areas with particular habitat features that need to be preserved.  
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  ISSN 1385-1101 ISBN Médium  
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  Numéro d'Appel LL @ pixluser @ collection 373  
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Auteur Narchi, N.E.; Cornier, S.; Canu, D.M.; Aguilar-Rosas, L.E.; Bender, M.G.; Jacquelin, C.; Thiba, M.; Moura, G.G.M.; De Wit, R. url  doi
openurl 
  Titre Marine ethnobiology a rather neglected area, which can provide an important contribution to ocean and coastal management Type Article scientifique
  Année 2014 Publication Revue Abrégée Ocean & Coastal Management  
  Volume (down) 89 Numéro Pages 117-126  
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  Résumé Abstract

This report describes marine ethnobiology as it has been presented and discussed under the conference session “Ethnothalassic interactions” organized for the 13th International Congress of Ethnobiology. We define marine ethnobiology as a field within ethnobiology that specifically comprises the study of the relationships of present and past human societies to marine biota and ecosystems. The session stimulated discussion on this emerging field and its contribution to coastal and ocean management, by exchanging experiences on a diverse array of studies within this field that include: co-management of marine protected areas, seascape management, demise, re-discovery and re-implementation of traditional knowledge-based management schemes, history of artisanal shellfish-farming and of the management of artisanal fisheries, medicinal knowledge of algae, as well as the outreach of ethnobiological studies for the conservation of the cultural-ecological heritage in the coastal zone. We here offer the conclusions of the conference session in the form of a longue duree perspective on coastal management that highlights a broad array of human adaptations to coastal environments. We suggest that these adaptations have to be researched and understood in detail in order to incorporate them into broader coastal management strategies in the presence of the severe environmental and political-economical pressures that currently threaten fishing stocks, marine habitats, and the livelihoods of the 2.6 billion people that depend on the oceans as their main source of protein.
 
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  ISSN 0964-5691 ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 1358  
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Auteur Elisabeth, N.H.; Caro, A.; Cesaire, T.; Mansot, J.-L.; Escalas, A.; Sylvestre, M.-N.; Jean-Louis, P.; Gros, O. url  doi
openurl 
  Titre Comparative modifications in bacterial gill-endosymbiotic populations of the two bivalves Codakia orbiculata and Lucina pensylvanica during bacterial loss and reacquisition Type Article scientifique
  Année 2014 Publication Revue Abrégée FEMS microbiology ecology  
  Volume (down) 89 Numéro 3 Pages  
  Mots-Clés Index Medicus; Lucinidae; cell size; endosymbiotic population; genomic content; starvation; sulphur content  
  Résumé Until now, the culture of sulphur-oxidizing bacterial symbionts associated with marine invertebrates remains impossible. Therefore, few studies focused on symbiont's physiology under stress conditions. In this study, we carried out a comparative experiment based on two different species of lucinid bivalves (Codakia orbiculata and Lucina pensylvanica) under comparable stress factors. The bivalves were starved for 6months in sulphide-free filtered seawater. For C.orbiculata only, starved individuals were then put back to the field, in natural sediment. We used in situ hybridization, flow cytometry and X-ray fluorescence to characterize the symbiont population hosted in the gills of both species. In L.pensylvanica, no decrease in symbiont abundance was observed throughout the starvation experiment, whereas elemental sulphur slowly decreased to zero after 3months of starvation. Conversely, in C.orbiculata, symbiont abundance within bacteriocytes decreased rapidly and sulphur from symbionts disappeared during the first weeks of the experiment. The modifications of the cellular characteristics (SSC – relative cell size and FL1 – genomic content) of the symbiotic populations along starvation were not comparable between species. Return to the sediment of starved C.orbiculata individuals led to a rapid (2-4weeks) recovery of symbiotic cellular characteristics, comparable with unstressed symbionts. These results suggest that endosymbiotic population regulation is host-species-dependent in lucinids. 2014 Federation of European Microbiological Societies. Published by John Wiley & Sons Ltd. All rights reserved.  
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  Langue English Langue du Résumé Titre Original  
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  ISSN 1574-6941 ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 481  
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Auteur van den Hout, P.J.; van Gils, J.A.; Robin, F.; van der Geest, M.; Dekinga, A.; Piersma, T. openurl 
  Titre Interference from adults forces young red knots to forage for longer and in dangerous places Type Article scientifique
  Année 2014 Publication Revue Abrégée Animal Behaviour  
  Volume (down) 88 Numéro Pages 137-146  
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  Numéro d'Appel MARBEC @ alain.herve @ 1072 collection 1374  
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