Adaptations métaboliques des organismes dans la zone de balancement des marées : implications sur la biodiversité locale dans un contexte de changement climatique

Abstract : Coastal zone represents only a small part of ocean surface, but play a major role in carbon cycling. Ro help clarify this role; this thesis aimed to study carbon fluxes of intertidal benthic rocky shore communities during immersion and emersion. Respiration and calcification measurements of principal macrozoobenthic species were performed in the laboratory in order to evaluate their different metabolic adaptation to intertidal conditions. In addition, community carbon fluxes were quantified in situ at the air-sediment and water-sediment interfaces. Community respiration generally prevails on primary production indicating that semi-exposed intertidal rocky shore communities could be considered as heterotrophic. The contribution of macrozoobenthic organisms to carbon fluxes was estimated on a regional scale through respiration and calcification rates measured in the laboratory and species abundances recorded in Brittany (France) exposed rocky shores. The comparison between in situ and laboratory studies allowed our methods validation.
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Morgana Tagliarolo. Adaptations métaboliques des organismes dans la zone de balancement des marées : implications sur la biodiversité locale dans un contexte de changement climatique. Sciences agricoles. Université de Bretagne occidentale - Brest, 2012. Français. ⟨NNT : 2012BRES0046⟩. ⟨tel-00816887v2⟩

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