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Group Size and Growth Rate in Hatchling Green Iguanas (Iguana iguana)

Gordon M. Burghardt and A. Stanley Rand
Behavioral Ecology and Sociobiology
Vol. 18, No. 2 (1985), pp. 101-104
Published by: Springer
Stable URL: http://www.jstor.org/stable/4599868
Page Count: 4
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Group Size and Growth Rate in Hatchling Green Iguanas (Iguana iguana)
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Abstract

The post-hatching growth and sleeping group sizes of green iguanas (Iguana iguana) were followed on Barro Colorado Island, Panama, for 3 successive years. The laboratory clearing was subdivided and surveyed routinely for iguanas, most intensively the six weeks following onset of hatching. A similar pattern of influx of iguanas into the clearing took place each May. Over the early weeks the size of groups generally increased. Animals sleeping in larger groups had significantly faster growth rates. Animals that disappeared from the clearing prior to July had larger group sizes prior to disappearance than those that remained. Growth rates measured in animals that remained declined markedly after June. Possible reasons for the social grouping of young iguanas are discussed.

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