Before-After analysis of the trophic network of an experimental dumping site in the eastern part of the Bay of Seine (English Channel)

MARINE POLLUTION BULLETIN

卷:118

Article

Pezy, Jean-Philippe¹  Raoux, Aurore^1,2  Marmin, Stella¹  Balay, Pierre³  Niquil, Nathalie²  Dauvin, Jean-Claude¹ 

[1] Normandie Univ, Lab Morphodynam Continentals & Cotiere, CNRS UMR M2G 6143, UNIROUEN,UNICAEN, 24 Rue Tilleuls, F-14000 Caen, France

[2] Normandie Univ, UMR BOREA MNHN UPMC CNRS IRD 207 7208, UNICAEN, Esplanade Paix, F-14032 Caen 5, France

[3] CSLN, 53 Rue Prony, F-76600 Le Havre, France

关键词: Ecopath;    Trophic model;    Ecological Network Analysis;    Dredged material disposal;    Bay of Seine;   

DOI  :  10.1016/j.marpolbul.2017.02.042

来源: Elsevier

【 摘 要 】

An experimental study was conducted to assess the physical and biological impacts of muddy fine sand dredged material dumped on a medium sand site Machu offshore the Seine Estuary. Complementary trophic web modelling tools were applied to the Machu ecosystem to analyse the effects of dumping operations. Results show that, after the dumping operations, the biomass of fish increased while invertebrate biomass remained relatively stable through time. Nevertheless, the biomasses of benthic invertebrates, omnivores/scavengers and predators showed some increases, while non-selective deposit feeders and filter feeders decreased. At the ecosystem level, results show that the total ecosystem activity, the ascendency and the overall omnivorous character of the food-web structure increased after dumping operations, whereas recycling subsequently decreased. Finally, the fine and medium sand habitat offshore from the Seine estuary, which undergoes regular natural physical perturbations, shows a high resilience after a short dumping phase. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free