In collaboration with Payame Noor University and Iranian Society of Physiology and Pharmacology

Document Type : Article

Authors

1 Assistant professor, Environment department, Behbahan Khatam Alanbia University of Technology, Iran and Assistant Professor, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran‎

2 Instructor, Young Researcher and Elite Club, Ahvaz ‎Branch, Islamic Azad University, Ahvaz, Iran

3 Instructor, Environment department, Khorramshahr University of Marine Science and Technology, Iran

Abstract

The current study stablished to determine reproductive characteristics of the Little Egret Egretta garzetta in Ali-Siyah Island in Karoon River during 2007-2008. The breeding phenology started in March 28 with nest making and ended with last fledglings in June 24, 2008. Thirty nests were selected randomly using boats. In total 100 eggs with mean of 3.33 (3-5) eggs per nest were found. The average breeding success in hatching, nestling and post-nestling stages were 62%, 65% and 75% respectively. The mortality rate in mentioned stages were measured 25%, 10% and 3% as well. The mortality rate showed significant difference before hatching stage in comparison with other breeding stages. Clutch size, brood size and nest parameters did not have significant effect on the breeding success. Natural factors had most negative effect on the breeding success regarding to the special geographical position and limited access to the Island. 

Keywords

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