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SM ISO690:2012 KISELIOVA, Olga. Reproductive adaptations of fish species from the Dniester river under influence of hydroelectric powers construction. In: Buletinul Academiei de Ştiinţe a Moldovei. Ştiinţele vieţii, 2008, nr. 2(305), pp. 89-96. ISSN 1857-064X. |
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Buletinul Academiei de Ştiinţe a Moldovei. Ştiinţele vieţii | ||||||
Numărul 2(305) / 2008 / ISSN 1857-064X | ||||||
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Pag. 89-96 | ||||||
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There have been revealed different reproductive adaptations at different levels of fish organization such as cellular and tissular, individual and population levels. These adaptations
included modification of the age of first reproduction – some species start to reproduce earlier and transfer to the short life span (Blicca bjoerkna and Leuciscus leuciscus), while others reach sexual maturity later in their life (Abramis brama and Abramis sapa); decrease of condition factor could be explained by the diminuation of allocations for growth, increase of number of clutches for some fish species that facilitates the survival of offspring under the changeble environmental conditions. The changes of life history strategies and transfer of some fish species to shorter life span and specific reproductive adaptations demonstarte possibility of conversion under changeble environmental conditions from K-strategy to r-strategy that ensures the survival of fish populations. There has been noted the increase of fitness and decrease of adaptedness of investigated fish species as the result of hydroelectric powers cumulative impact. |
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