Document Type : Research Paper
Author
Abstract
The Present study conducted during March-September 2015 on Ghabre Nakhoda Island in Khoore Mosa Creek in Khozestan Province. Entrance of the Bridled Tern Onychoprion anaethetus (Scopoli, 1786) to Khabre Nakhoda Island started in mid-March and they leaved island after breeding in mid-September 2015. A total of 896 nests (breeder pairs) of the species were counted in the Ghabre Nakhoda Island under the shadow of bushes. In 142 selected nests, the process of reproduction, breeding success rates, large and small diameter parameters, the shape, size, volume of eggs, and weight of eggs before hatching and chicks after birth were measured. Averages of large diameter, small diameter, and depth of nests were 23.42±0.42, 19.08±0.29 and 3.07±0.17centimeter respectively. Averages of large diameter, small diameter, volume, shape and weight of eggs were 43.43±0.23, 31.11± 0.15 mm, 20.453±1.12 mm3 71.63±3.09 and 21.98±0.35gr respectively. Average success of the nestling, post nestling and fledging were 92.60, 91.44 and 73.94 percent respectively. Most of the mortality was 12 percent at post-nestling and minimum was 5 percent at incubation period. Average of incubation period was 28.5±1.5 day.
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