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Growth Rates of Great Egret, Snowy Egret and Black-Crowned Night-Heron Chicks

Thomas W. Custer and David W. Peterson, Jr.
Colonial Waterbirds
Vol. 14, No. 1 (1991), pp. 46-50
Published by: Waterbird Society
DOI: 10.2307/1521278
Stable URL: http://www.jstor.org/stable/1521278
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Growth Rates of Great Egret, Snowy Egret and Black-Crowned Night-Heron Chicks
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Abstract

Growth rates of Great Egret (Casmerodius albus), Snowy Egret (Egretta thula), and Black-crowned Night-Heron (Nycticorax nycticorax) chicks to 18 days-of-age were estimated from repeated measurements of chicks in broods of three young. Weight gain (g/day) or increase in length (mm/day) of forearm, tarsus, or culmen did not differ between Black-crowned Night-Heron chicks at a colony in Rhode Island and a colony in Texas. In Black-crowned Night-Herons and Great Egrets, the last chick (C-chick) to hatch had lower growth rates than the first (A-) or second (B-) hatched chick. Black-crowned Night-Heron and Great Egret A-chicks gained weight faster than Snowy Egret A-chicks; however, growth rates of the forearm, tarsus, or culmen each were not different among the three species. Equations based on the growth rate of culmen, forearm, or tarsus for repeatedly measured A-chicks estimated age of Great Egret, Snowy Egret, and Black-crowned Night-Heron chicks collected elsewhere to within two days of known age.

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