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Temporal variability of benthic-pelagic coupling in shallow enclosed environment: A case study with eutrophying shrimp ponds ArchiMer
Hochard, Sébastien; Royer, Florence; Hubert, Morgane; Lemonnier, Hugues.
The evolution of benthic pelagic coupling was followed in two semi-intensive shrimp ponds in New Caledonia, with a special emphasis on the role of microphytobenthos (MPB). Three distinct periods could be identified. During the first period, MPB activity led to relative decoupling between the water column and the sediment, both compartments being autotrophic with low nutrients exchanges. During the second period, the sediment operated at the edge of a functional switch between autotrophy and heterotrophy. The amplitude of nutrient fluxes depended of the pool considered (DIN, DIP) and showed light dark variation. In the last period, sediment switched to heterotrophy with the establishment of benthic-pelagic coupling concomitantly to a massive sediment...
Tipo: Text Palavras-chave: Tropical aquaculture; Shrimp; Eutrophication; Benthic-pelagic coupling; Microphytobenthos; Bioturbation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00485/59681/62754.pdf
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Assimilation of shrimp farm sediment by Holothuria scabra : a coupled fatty acid and stable isotope approach ArchiMer
Mathieu-resuge, Margaux; Le Grand, Fabienne; Schaal, Gauthier; Kraffe, Edouard; Lorrain, Anne; Letourneur, Yves; Lemonnier, Hugues; Benoît, Julie; Hochard, Sébastien.
Deposit-feeding sea cucumbers are efficient nutrient recyclers and have the potential to contribute to the limitation of organic matter load in polyculture or integrated aquaculture systems. Assessing how they assimilate organic matter originating from other farmed species is therefore important for the development of such multi-species farming systems. Here, a coupled stable isotope − fatty acid approach was used to characterize the assimilation of organic matter from shrimp (Penaeus stylirostris) farming by Holothuria scabra in an experimental culture system. H. scabra were reared in mesocosms on shrimp farming-originating sediment with and without additional food sources (maize and fish meals). Although fatty acid results did indicate that...
Tipo: Text Palavras-chave: Fatty acids; Stable isotopes; Rotational co-culture; Shrimp-farming; Holothurid.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00624/73589/73023.pdf
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