Sex ratio and female fecundity in the Black Sea invader, Oithona davisae Ferrari and Orsi, 1984 (Copepoda, Oithonidae): changes in coastal gradient conditions
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Abstract
The sex ratio and female fecundity of the Black Sea invader, the copepod Oithona davisae Ferrari and Orsi, 1984, were studied in situ conditions in the coastal waters of Sevastopol. An increase in the proportion of males in the invader population is usually observed twice a year: in June — July and in November — December, against the background of a low overall population size. During the period of maximum seasonal abundance of the species, a significant decrease in the number of males occurs. A tendency for a higher relative proportion of males is manifested in warmer and more trophic conditions of local water areas. The average number of eggs carried by a female in the autumn period was 10.4 ± 0.5 and did not depend on the trophic conditions of the water areas.
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References
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