Reproductive impairment of sea urchin upon chronic exposure to cadmium. Part II: Effects on sperm development
作者： DWT Au , AA Reunov , RSS Wu , None
DOI: 10.1016/S0269-7491(00)00036-1
关键词:
摘要: Chronic pollution may impair the reproductive success of adult organisms through a decrease in quality gametes. Our parallel study on gamete quality, showed that male sea urchins were more sensitive than females towards cadmium pollution. The effects chronic exposure to 0.01 and 1 ppm Cd2+ sperm development urchin Anthocidaris crassispina studied. Despite fact no significant change gonad index was observed when exposed both levels for 4 weeks, deposition electron-dense materials conspicuous at wall intracellular space gonads. Apparent cytological alterations cells, including changes morphology nuage spermatogonia. discrete, granular bodies replaced by large body. Spermatozoa with short, incomplete ‘broken’ tails (scanning electron microscope observation) or spermatids/spermatozoa extraordinary electron-density (transmission abundant gonads Cd2+. Mitochondrial cristae deformation cells all stages development. Sperm plasma membrane also became convoluted but acrosome remained intact. distortion mitochondria/midpiece could help explain decline motility as well poor perseverance produced our earlier study.
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