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Foraminiferal assemblages as bioindicators to assess potential pollution in mangroves used as a natural biofilter for shrimp farm effluents (New Caledonia)

TitreForaminiferal assemblages as bioindicators to assess potential pollution in mangroves used as a natural biofilter for shrimp farm effluents (New Caledonia)
Type de publicationJournal Article
Year of Publication2015
AuteursDebenay, J-P, Marchand, C, Molnar, N, Aschenbroich, A, Meziane, T
JournalMarine Pollution Bulletin
Volume93
Ticket1-2
Pagination103-120
Date Published15 April 2015
Type of ArticleResearch
Mots-clésEffluents, fatty acids, Foraminifera, Mangrove, Shrimp farming, SW Pacific
Résumé

In New Caledonia, semi-intensive shrimp farms release untreated effluents into the mangrove. Foraminiferal assemblages were analyzed for assessing the impact of effluent release on the benthic compartment. Comparison was made between samples collected (1) in an effluent receiving mangrove before and after the rearing cycle, and (2) for one-year monitoring an effluent receiving and a control mangrove. The distribution of foraminiferal assemblages was primarily driven by the gradient between Rhizophora stands and salt-flats, related to salinity and tidal elevation, and by seasonal cycles. The potential impact of effluent release was due to the combined effects of normal-saline effluents on surface salinity, and of nutrient input and microbial stimulation on food availability. Foraminiferal assemblages did not indicate a substantial impact of farm effluents and suggest that semi-intensive shrimp farming using mangrove for effluent discharge may appear as a sustainable solution in New Caledonia, when considering only the impact on the mangrove itself.

DOI10.1016/j.marpolbul.2015.02.009