|Biological observations on small cyclopoid copepods in the Red Sea|
Böttger-Schnack, R.; Schnack, D.; Weikert, H. (1989). Biological observations on small cyclopoid copepods in the Red Sea. J. Plankton Res. 11(5): 1089-1101
In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873; e-ISSN 1464-3774, meer
Population characteristics > Population structure > Sex ratio
|Auteurs|| || Top |
- Böttger-Schnack, R.
- Schnack, D.
- Weikert, H.
The breeding activity, sex ratio and variation in body length of a number of cyclopoid copepod species from the upper 450 m of the Red Sea were analyzed. In most species the body length of adult specimens was in the lower range or less than those reported from other pelagic regions. In the central Red Sea most species had some individuals actively breeding, during both autumn and winter. To the north, breeding was observed in fewer species. Only two species, Paroithona sp. and Agetus limbatus, however, seemed to find conditions for reproduction better in the north than in the central area. The sex ratios were quite consistent for all species within the families Sapphirinidae and Corycaeidae (high percentage of males) and Oithonidae (low percentage of males). Within the Oncaeidae, the percentage of males varied from a few percent to > 60% of adults.