期刊
MARINE POLLUTION BULLETIN
卷 62, 期 1, 页码 55-65出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2010.09.009
关键词
Solea senegalensis; Histopathology; Weighted indices; Contaminated sediments; Estuary; Bioassays
资金
- FEDER [POCTI/AMB 57281/104]
- FCT [SFRH/BD/28465/2006]
- APSS (Administracao dos Portos de Setubal e Sesimbra, SA)
Juvenile Senegalese soles were exposed through 28-day laboratory and field (in situ) bioassays to sediments from three sites of the Sado estuary (W Portugal): a reference and two contaminated by metallic and organic contaminants. Fish were surveyed for ten hepatic histopathological alterations divided by four distinct reaction patterns and integrated through the estimation of individual histopathological condition indices. Fish exposed to contaminated sediments sustained more damage, with especial respect to regressive changes like necrosis. However, differences were observed between laboratory- and field-exposed animals, with the latest, for instance, exhibiting more pronounced fatty degeneration and hepatocellular eosinophilic alteration. Also, some lesions in fish exposed to the reference sediment indicate that in both assays unaccounted variables produced experimental background noise, such as hyaline degeneration in laboratory-exposed fish. Still, the field assays yielded results that were found to better reflect the overall levels of contaminants and physico-chemical characteristics of the tested sediments. (C) 2010 Elsevier Ltd. All rights reserved.
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