Temporal variations in fecal indicator bacteria in bathing water and sediment in a coastal ecosystem (Aytré Bay, Charente-Maritime, France).

Autor: Ndione M; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Ory P; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Agion T; QUALYSE, Laboratoire d'analyses, La Rochelle, France., Treilles M; QUALYSE, Laboratoire d'analyses, Champdeniers, France., Vacher L; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Simon-Bouhet B; Centre d'Etudes Biologiques de Chizé (CEBC), UMR 7372 CNRS-La Rochelle Université, Chizé, France., Le Beguec M; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Pineau P; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Montanié H; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France., Agogué H; Littoral Environnement et Sociétés (LIENSs) UMR 7266 CNRS-La Rochelle Université, La Rochelle, France. Electronic address: helene.agogue@univ-lr.fr.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2022 Feb; Vol. 175, pp. 113360. Date of Electronic Publication: 2022 Feb 05.
DOI: 10.1016/j.marpolbul.2022.113360
Abstrakt: This study presents the fecal contamination dynamic at the two bathing sites of Aytré Bay (Charente Maritime, France). We quantified fecal indicator bacteria (FIB) abundances (Escherichia coli and enterococci) from water and sediment samples over one-year survey. Then we measured biological (bacterial abundance, chlorophyll-a), physico-chemical (dissolved nutrients and oxygen, salinity, pH …) and climatic (temperatures, rainfall and tidal coefficient) parameters. Results showed that FIB abundances were occasionally higher than the European regulatory threshold during winter, summer and fall. The "poor quality" of the bathing water was due to high enterococci abundance. We found negative significant correlations between FIB and water temperature and salinity, and positive significant correlations between FIB and rainfall, PO 4 , NO 3 , NO 2 , and SiO 2 mainly in water. Relationships between parameters showed that during summer and spring the main environmental drivers were temperature and salinity, while in fall and winter they were rainfall and dissolved nutrients.
(Copyright © 2022. Published by Elsevier Ltd.)
Databáze: MEDLINE
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