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Hétérogénéité sédimentaire et micro-habitats benthiques : approches in situ et expérimentale

Abstract : The eastern Bay of Seine is characterized by complex sediment structures with high spatial and vertical heterogeneities. Its variability involves complexes animal-sediment relationships still unclear. A new approach based on the individual scale combines in situ sampling with experiments. The macrofauna vertical distribution and quantification of biogenics structures have shown the main concentration of the fauna in the first 10 cm depth, such as 98 % of the total abundance. Two abundance pics have been observed, the first close to the surface between 0 and 2 cm depth and the other one between 5 to 7 cm depth, mainly due to two species, Kurtiella bidentata and Chaetozone spp., which represent almost 80 % of the abundance from 5 to 7cm. Their presence within this depth is still unknown. Experiments have shown the great sediment reworking skill of the worm Lagis koreni and its ability to destroy the sediment structure, which can be linked to the in situ samples. This preliminary work has shown the interest of the techniques used and makes us going further.
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Maxime Navon. Hétérogénéité sédimentaire et micro-habitats benthiques : approches in situ et expérimentale. Biodiversité et Ecologie. Normandie Université, 2016. Français. ⟨NNT : 2016CAEN2051⟩. ⟨tel-01922479⟩

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