The Biology of Lytechinus Variegatus
Abstract:L. variegatus is an abundant urchin along the southeastern coast of the United States. It feeds largely on Thalassia, and is eaten by various gastropods and birds. Gonads develop at a test diameter of about 40 mm and at an age of about one year. The growth rate shows a negative correlation with temperature. Spawning occurs throughout the summer, at Miami, but is briefer in Bermuda where it also exhibits a lunar rhythm. Following an unusually cold winter in Miami, a large proportion were protandrous hermaphrodites and had an unusual test shape. Except in the oldest urchins, tissue production is 100 - 200 per cent in 30 days. A tentative estimate of food requirements and efficiency is given.
Document Type: Research Article
Publication date: January 1, 1963
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