Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/59710
Título: | Feeding inhibition in Corbicula fluminea (OF Muller, 1774) as an effect criterion to pollutant exposure: perspectives for ecotoxicity screening and refinement of chemical control |
Autor(es): | Castro, Bruno B. Silva, Carlos Macário, Ines Patrunilho Efe Oliveira, Bruno Goncalves, Fernando Pereira, Joana Luísa |
Palavras-chave: | Aquatic pollution Behaviour Biosensor Chemical control Clearance rate Filter feeding |
Data: | 2018 |
Editora: | Elsevier |
Revista: | Aquatic Toxicology |
Resumo(s): | Bivalves are commonly used in biomonitoring programs to track pollutants. Several features, including its filter feeding abilities, cumulatively argue in favour of the use of the Asian clam (Corbicula fluminea) as a biosentinel and an ecotoxicological model. Filtration in bivalves is very sensitive to external stimuli and its control is dictated by regulation of the opening/closure of the valves, which may be used as an avoidance defence against contaminants. Here, we investigate the filter-feeding behaviour of the Asian clam as an endpoint for assessing exposure to pollutants, driven by two complementary goals: (i) to generate relevant and sensitive toxicological information based on the ability of C. fluminea to clear an algal suspension, using the invasive species as a surrogate for native bivalves; (ii) to gain insight on the potential of exploring this integrative response in the refinement of chemical control methods for this pest. Clearance rates and proportion of algae removed were measured using a simple and reproducible protocol. Despite some variation across individuals and size classes, 50-90% of food particles were generally removed within 60-120 min by clams larger than 20 mm. Removal of algae was sensitive to an array of model contaminants with biocide potential, including fertilizers, pesticides, metals and salts: eight out of nine tested substances were detected at the mu g l(-1) or mg l(-1) range and triggered valve closure, decreasing filter-feeding in a concentration-dependent manner. For most toxicants, a good agreement between mortality (96 h - LC50 within the range 0.4-5500 mg l(-1)) and feeding (2 h - 1050 within the range 0.005-2317 mg l(-1)) was observed, demonstrating that a 120-min assay can be used as a protective surrogate of acute toxicity. However, copper sulphate was very strongly avoided by the clams (IC50 = 5.3 mu g l(-1)); on the contrary, dichlorvos (an organophosphate insecticide) did not cause feeding depression, either by being undetected by the clams' chemosensors and/or b |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/59710 |
DOI: | 10.1016/j.aquatox.2018.01.002 |
ISSN: | 0166-445X |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CBMA - Artigos/Papers DBio - Artigos/Papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
2018 - castro et al [Aquat Toxicol 196].pdf Acesso restrito! | 604,4 kB | Adobe PDF | Ver/Abrir | |
2018 - castro et al (suppl material 1).docx Acesso restrito! | 1,17 MB | Microsoft Word XML | Ver/Abrir | |
2018 - castro et al (suppl material 2).xlsx Acesso restrito! | 47,1 kB | Microsoft Excel XML | Ver/Abrir |