Free Content Coral Reef Project—Papers in Memory of Dr. Thomas F. Goreau. 1.

The Nature of Reef-Building (Hermatypic) Corals

 Download
(PDF 825.5kb)
 
Download Article:

Abstract:

Scleractinia are typical anthozoan coelenterates with the same basic structure and physiology as Actiniaria, from which they differ in the capacity to secrete a complex calcareous skeleton and in being usually colonial. There is no distinction systematically between hermatypic (reef-building) and ahermatypic species, but the former invariably contain, in the endoderm, immense populations of endozoic dinoflagellates (zooxanthellae). In comparison with conditions in the ahermatypes, these enhance metabolic efficiency by acting as automatic agents of excretion and by increasing the rate of skeleton formation. They may also assist, qualitatively if not quantitatively, in nutrition, although all Scleractinia (hermatypes equally with ahermatypes) possess highly efficient organs of feeding (nematocysts with tentacles and/or cilia) and of digestion (mesenterial filaments). In the hermatypes there is a remarkable range in both size and form of the polyps and of the calyces into which they are withdrawn as well as in skeletal form generally. This indicates great powers of adaptability because these have all been through the sieve of natural selection. The precise significance of these adaptations, although presumably involving food collection, remains obscure in the majority of cases. The present concentration by workers on studies of overall productivity of coral reefs would have greater significance if accompanied by detailed studies of individual species of a range of hermatypic corals.

Document Type: Research Article

Publication date: March 1, 1973

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

Tools

Favourites

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
X
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