Free Content Reproductive Periodicities of Indo-Pacific Invertebrates in the Gulf of Suez. II. The Echinoid Echinometra Mathaei (De Blainville)

(PDF 2,439.2 kb)
Download Article:


Seasonal reproductive changes in several populations of the echinoid Echinometra mathaei near both the head and mouth of the Gulf of Suez were followed for more than a year. Well-defined reproductive periodicities occurred near the head of the Gulf; gametogenesis began in different individuals in the spring and early summer, and spawning occurred in the summer and fall. At other times of the year the gonads were completely quiescent reproductively. Nutritive phagocytic tissue in the gonads accumulated mainly in the fall and early winter, and decreased mainly in the late spring and summer. Much less well-defined reproductive periodicities occurred near the mouth of the Gulf, and in the adjacent Red Sea and farther south there was no synchronized periodicity within the populations. It is suggested that both a critical minimal temperature and a critical minimal level of nutrient reserves are important for the regulation of the reproductive periodicities.

Document Type: Research Article

Publication date: September 1, 1969

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more