风头鸊鷉的繁殖生态

Studies on the Breeding Ecology of Great-crested Grebe

风头鸊鷉每年3月初迁来乌梁素海,10月末11月初离去.它们在蒲苇地营水面浮巢,巢材主要为苇茎,蒲叶和水草,巢的外径65cm,内径17cm,深3.5cm。窝卵数3～5枚,平均4枚,日产一枚卵圆形污白色卵。卵径平均36.39×54.87mm,卵重37.89。

Great-crested Grebe(Podiceps cristatus)is one of the more common natatorial birds in Wuliangsuhai region of NeiMongol. Studies on their breading ecology was carried out during the years 1986～1987. Great—crested Grebe are summer residents at Wuliangsuhai. They appear on WuIiangsuhal from about the beginning of March, leave in the end of October to the beginning of November. Great-crested Grebe build their nests in the reed swamp. The nests are mostly made of reed-stems, cattail-leaves, and waterweeds, measuring 65 cm outside, 17 cm inside and 3.5 cm in depth. The clutch consists of 3～5 eggs, 4 eggs in mean clutch size. During the period of egg-laying, an agg is usually laid every day, the eggs are generally oval in shape. 23 eggs average 36.39(34～39.5)×(54.87(51～60)mm in size; 16 eggs 37. 8(33.3～46.1)gm in weight.