REPRODUCTIVE PERIODICITIES OF MARINE ANIMALS OF TROPICAL MIDDLE EAST WATERS.
Final rept., 15 Jun 66-31 Dec 67,
AMERICAN UNIV CAIRO (EGYPT)
Pagination or Media Count:
Circannian reproductive periodicities were followed in five wide-spread Indo-Pacific sea urchins in the Gulf of Suez area Prionocidaris baculosa, Diadema setosum, Tripneustes gratilla, Echinometra mathaei and Lovenia elongata. Individual gametogenic cycles were similar in all species, and included a reciprocal relationship between the amount of nutritive tissue present and gametogenesis. E. mathaei spawned only during the summer June-Sept. within the Gulf of Suez, while it spawned throughout the year in the adjacent Red Sea. T. gratilla spawned during the winter Nov.-Apr. in the northern Red Sea. The other three species were summer spawners. There was little direct relation between the annual sea temperature fluctuations and the reproductive periodicities. Temperature fluctuations, however, probably did influence the nutrient buildup needed prior to the onset of gametogenesis. Reproductive activity also was examined in 11 other species in the Gulf of Suez area Asterina burtoni and Linckia multifora Asteroidea, Acanthopleura haddoni and Onithochiton erythraeus Amphineura, Haliotis pustulata Gastropoda, Tetrachthamalus oblitteratus Cirripedia, and Athanas indicus, Petrolisthess rufescens and Pilumnopeus vauguelini Malacostraca. The majority of the species within the Gulf of Suez spawned during the summer, while reproductive activity was more prolonged and tended to begin during mid-winter in the adjacent Red Sea. Slight differences in the maximum daily sea temperatures during the winter were thought to be responsible for these reproductive differences. Author
- Anatomy and Physiology
- Biological Oceanography