Reproductive Periodicities of Indo-Pacific Invertebrates in the Gulf of Suez. IV. The Chitons Acanthopleura Haddoni Winckworth and Onithachiton Lyelli (Sowerby), and the Abalone Haliotis Pustulata Reeve
The widespread intertidal tropical molluscs Acanthopleura haddoni and Haliotis pustulata reproduce with synchronized seasonal cycles in the seasonally fluctuating environment of the northern Gulf of Suez. In both species, gametogenesis begins in the spring during the period
of increasing air and sea temperatures, and spawning occurs in the summer during the warmest time of the year. Reproduction of Onithochiton lyelli also occurs mainly in the summer in the Gulf of Suez, but appears to be much less synchronous and ripe animals were found during most of
the year. Samples of both H. pustulata and O. lyelli had significantly biased sex ratios with more males than females. Samples taken 350 km south in the northern Red Sea, where seasonal environmental fluctuations are more moderate, indicate different seasonal patterns of reproduction
in A. haddoni and H. pustulata, with winter spawning in the latter.
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