| Autor: |
Vaschenko, M. A., Zhadan, P. M., Medvedeva, L. A., Syasina, I. G. |
| Předmět: |
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| Zdroj: |
Hydrobiologia; 1997, Vol. 352 Issue 1-3, p231, 0p |
| Abstrakt: |
The morphology of gonads and development of offspring of the scallopMizuhopecten yessoensis sampled from six stations in Peter the GreatBay (Sea of Japan) were studied. The retardation of gametogenesis, oocytes resorption, autolysis of spermatozoa and their phagocytosis were observed in the gonads of the scallops from polluted sites. The number of hermaphrodites was about 6% against 0.3-0.4% in the scallop populations from clean areas. In the offspring development, a decreasein fertilisation success, diminution in percent of normal trochophores, D-veligers, veligers, and retardation of larval growth were recorded. The scallop populations inhabiting polluted areas of Peter the Great Bay seem to be incapable of normal reproduction. Development of offspring was a more sensitive index of disturbance of the reproductive function than morphology of scallop gonads. Analysis of the offspring development of common species of marine invertebrates is suggested to be used as a sensitive indicator of adverse environmental conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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