The Central and South Reef Biotope
Occurs along the southwestern and southern edge of the reef tract and on the patch reefs of the central lagoon. The dominant coral are small heads of Diploria, Isophyllia, Siderastrea and Porites. The hydrozoan Millepora grows in large erect branching colonies indictive of the lower energy environment. Homotrema is less abundant and less important in this biotope.
The central and southern reefs contain sediments with
both reef and lagoonal elements. The dominant material in the sediments
of the outer reef tract on the southern ledge of the platform are reef
dwelling organisms such as coral and Homotrema. the
remainer of the southern reef tract in the central lagoon and flats has
sediment derived from mixed reef and lagoonal materials. Central reef sediment
is composed of the same skeletal elements as the other reefs, except that
Homotrema is rare or absent.