Effects of cadmium and zinc toxicity on orientation behaviour of Echinoparyphium recurvatum (Digenea: Echinostomatidae)cercariae

Diseases of Aquatic Organisms

J. W. Lewis¹  M. Crane¹  N. J. Morley¹ 

关键词: Echinoparyphium recurvatum;    Cercariae;    Phototaxis;    Geotaxis;    Autometallography;    Cadmium;    Zinc;   

DOI  :  10.3354/dao056089

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: The effects of cadmium and zinc toxicity on orientation behaviour (photo- and geo-taxis) of Echinoparyphium recurvatum cercariae was investigated at concentrations ranging from 10 to 1000 µg l^-1. Exposure to the toxicants atall metal concentrations caused a change in orientation to negative phototaxis and positive geotaxis during the sub-maximal dispersal phase (0.5 h cercarial age). Autometallography staining of cercariae exposed to 1000 µg l^-1 cadmium or zincshowed selective binding of heavy metals to tegumental surface sitesassociated with sensory receptors. The significance to parasite transmission of changes in cercarial orientation behaviour in metal polluted environments is discussed.

【 授权许可】

Unknown