Data/hora: 02/06/2024 07:32:54

Provedor de dados: | 5
País: | France
Título: | Effects of bioactive extracellular compounds and paralytic shellfish toxins produced by Alexandrium minutum on growth and behaviour of juvenile great scallops Pecten maximus
Autores: | Borcier, Elodie; Morvezen, Romain; Boudry, Pierre; Miner, Philippe; Charrier, Gregory; Laroche, Jean; Hegaret, Helene.
Data: | 2017-03
Ano: | 2017
Palavras-chave: | Harmful Algal Bloom (HAB); Alexandrium minutum; Pecten maximus; Paralytic Shellfish Toxins (PST); Extracellular compounds; Behaviour; Histology.
Resumo: | Dinoflagellates of the genus Alexandrium are a major cause of harmful algal blooms (HABs) that have increasingly disrupted coastal ecosystems for the last several decades. Microalgae from the genus Alexandrium are known to produce paralytic shellfish toxins (PST) but also bioactive extracellular compounds (BEC) that can display cytotoxic, allelopathic, ichtyotoxic or haemolytic effects upon marine organisms. The objective of this experimental study was to assess the effects of PST and BEC produced by A. minutum upon juvenile great scallops Pecten maximus. Scallops were exposed for one week to two different strains of A. minutum, the first producing both PST and BEC and the second producing only BEC. Escape response to starfish, daily shell growth, histological effects, and accumulation of PST were recorded after one week of exposure, and after two subsequent weeks of recovery. Daily shell growth was delayed three days in scallops exposed to the BEC-producing A. minutum strain, probably during the three first days of exposure. An increase of reaction time to predators was observed in scallops exposed to the BEC condition, suggesting that BEC may have altered sensing processes. Scallops exposed to PST displayed a less-efficient escape response and muscular damage which could reflect the effects of paralytic toxins upon the nervous system of scallops. This study demonstrates contrasting effects of the distinct toxic compounds produced by A. minutum upon marine bivalves, thus highlighting the importance to better characterize these extracellular, bioactive compounds to better understand responses of other marine organisms.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00368/47878/47893.pdf

DOI:10.1016/j.aquatox.2017.01.009

http://archimer.ifremer.fr/doc/00368/47878/

Editor: | Elsevier Science Bv
Formato: | application/pdf
Fonte: | Aquatic Toxicology (0166-445X) (Elsevier Science Bv), 2017-03 , Vol. 184 , P. 142-154

Fonte:

2017 Elsevier B.V. All rights reserved.

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