Impact of wastewater treatment plant discharges on macroalgae and macrofauna assemblages of the intertidal rocky shore in the southeastern Bay of Biscay

Type Article
Date 2019-06
Language English
Author(s) Huguenin L.1, 2, 3, Lalanne Y.3, De Casamajor Marie-NoelleORCID4, Gorostiaga J.-M.3, Quintano E.3, Salerno M.2, Monperrus M.1, 2
Affiliation(s) 1 : CNRS/ UNIV PAU & PAYS ADOUR/ E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Materiaux – MIRA, UMR5254, Anglet, 64600, France
2 : UNIV PAU & PAYS ADOUR/ E2S UPPA, UFR Sciences et Techniques de la Côte Basque –1 Allée Parc Montaury, Anglet, 64600, France
3 : Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, PO Box 644, Bilbao, 48080, Spain
4 : IFREMER - Laboratoire Environnement Ressources Arcachon (FED 4155 MIRA) - 1 allée du parc Montaury, Anglet, 64600, France
Source Continental Shelf Research (0278-4343) (Elsevier BV), 2019-06 , Vol. 181 , P. 34-49
DOI 10.1016/j.csr.2019.04.014
Keyword(s) Benthic communities, Bioindicators, Impacts, Pollution, Sewage, Marine strategy framework directive
Abstract

Rocky intertidal habitats are particularly vulnerable to anthropogenic pressures especially in areas with high urban concentrations such as southeastern Bay of Biscay. This research aims to establish an assessment of the potential impact of sewage discharges on intertidal rocky benthic assemblages on macroalgae and on macrofauna as required by the European Directives (Water Framework Directive -WFD and Marine Strategy Framework Directive -MSFD). The assemblages were sampled at five locations according to a control-impact design. A moderate detectable effect of discharges was highlighted on the assemblage structure by means of multivariate analyses but this was less evident using other biological and ecological metrics. Results would also suggest that benthic macroalgae constitute for the study area the best relevant biotic component to assess the effect of this pressure on the intertidal rocky platform habitats. Changes in the relative abundance of Ceramium spp., Corallina spp. and Halopteris scoparia were mainly responsible of the dissimilarities found. Finally, a pseudo-ecological quality ratio, based on the current WFD metrics, was also calculated for each site within locations (i.e. each distance from the outfall) to assess its sensitivity to this type of pressure. Results were conformed with those of the WFD monitoring because un- or less-impacted sites were ranked as “Good” contrary to the others ranked as “Moderate”. Thus, this work provides additional information for the MSFD and bridges deficiencies emphasized by Directives on the response of biological indicators to various pressures and the biocenosis of southeastern Bay of Biscay.

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Huguenin L., Lalanne Y., De Casamajor Marie-Noelle, Gorostiaga J.-M., Quintano E., Salerno M., Monperrus M. (2019). Impact of wastewater treatment plant discharges on macroalgae and macrofauna assemblages of the intertidal rocky shore in the southeastern Bay of Biscay. Continental Shelf Research, 181, 34-49. Publisher's official version : https://doi.org/10.1016/j.csr.2019.04.014 , Open Access version : https://archimer.ifremer.fr/doc/00494/60587/