Contributions to the Biology of the Sea Urchin Eucidaris Tribuloides (Lamarck)
Abstract:The sea urchin Eucidaris tribuloides (Lamarck) is found in several different habitats off southeastern Florida. This species appears to be particularly adapted for living in rocky and coral reef areas, using its primary spines to anchor itself under rocks or in crevices. It may move from these protective sites at night. On reefs it ingests hard particles of limestone, probably deriving nourishment from boring and encrusting organisims associated with this material. On the patch reefs of Margot Fish Shoal, growth of the gonads in the population took place during spring and summer 1965-66. There was some gametogenetic activity throughout the year. Sex cells accumulated, forming ripe gonads in late summer and early fall of 1965 and 1966. Relative growth rate of the test decreased with increasing size of the urchin, and it also decreased during the slimmer. Urchins probably live at least four to five years. Although the greatest population density was observed on shallow-water, outer reefs, the growth rate there was less than in areas closer to shore. Urchins from different habitats varied in size and in dimensions of the test. Eucidaris was reared from the egg through metamorphosis in 25 days.
Document Type: Research Article
Publication date: June 1, 1968
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