La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Influence of benthic fauna on organic matter decomposition in organic-enriched fish farm sediments (2003)
Auteurs :	A. C. Heilskov, Auteur ; M. Holmer, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (53(4) décembre 2003)
Article en page(s) :	153-161
Langues:	Anglais
Résumé :	The impact of benthic fauna on benthic mineralization rates and pathways were examined in organic rich sediments surrounding a marine fish farm by in situ additions of the polychaete Nereis diversicolor and the bivalve Macoma balthica. High mineralization rates were measured in the sediment affected by the fish farm after a two-month experimental period. The presence of benthic fauna further increased benthic metabolism by 44%, but this stimulation appeared to be caused by the fauna rather than increased microbial mineralization rates probably as a consequence of saturation of the microbial communities with labile organic matter. Sulfate reduction rates were high (103 mmol C m(-2) d(-1)) in the impacted fish farm sediment, accounting for the entire mineralization, whereas the anaerobic fraction of mineralization decreased to 39% in presence of benthic fauna. This indicates a fauna-mediated shift in mineralization pathway towards more oxidized conditions and increased aerobic mineralization in bioturbated sediments.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-53-2003/53-issue-4.html

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