Clutch size, timing of laying, and reproductive success in a colony of Great Blue Herons and Great Egrets

Author(s): 

Pratt, H. M.
Winkler, D. W.

Publication Date: 

Jan 1985

Type of Document: 

Journal Article

During a 13-yr period mean Great Blue Heron (Ardea herodias) clutch size at a central California colony ranged between 2.72 and 3.35 eggs, with an overall mean of 3.16. Mean Great Egret (Casmerodius albus) clutch size ranged from 2.70 to 3.07 eggs, with an overall mean of 2.87. Annual differences in clutch size were weakly significant in both species, and clutch size in both species declined slightly with relative as well as absolute time of breeding. The overall mean number of fledglings produced from heron nests was 1.45, with annual means ranging from 0.89 to 2.38.

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Web Page Link: 

Citation: 

Pratt, H. M., and D. W. Winkler. 1985. Clutch size, timing of laying, and reproductive success in a colony of Great Blue Herons and Great Egrets. Auk 102: 49-63.

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