【摘要】 研究结果表明:白鹭Egretta garzetta 3月中下旬迁来,8月中旬全部迁离。巢树种类有侧柏Thuji orientalis、药树Pistacia chinensis等;巢树均高14.54±1.28m(n=18);巢距地面高12.37±1.13m(n=29);群巢;巢外径470.3±54.9×401.3±71.3,内径286.7±38.3×238.7±33.8,高136.7±31.1,深44.0±8.4,营巢枝直径34.19±11.13mm(n=15);巢间距1.39±0.48m(n=14);巢干重503.6±63.8g(n=10)。混交现象比较普遍,但失败率高(50％)。窝卵数4.36±0.82(n=50),卵蓝绿色,无斑,卵圆形,卵径44.57±1.95×32.72±1.05mm,卵重(鲜)26.8±2.4g(n=194),密度(鲜)1.105±0.006g/cm~3(n=48)。雌雄共同孵化,孵化期24天,卵巢损失率18.5±1.63％,密度降至0.901±0.020g/cm~3(n=21)。雏鸟由双亲饲喂,留巢期25天,雏期40天,约15日龄建立恒温机制。更多还原

【Abstract】 Observations on the Little Egret ( Egretta garzetta) were carried out at Chen Jiawan, Tong Qianba, Miansxian, Shaanxi provine from March to August, 1988. The results showed that the birds breed from late March to early August in the nest area. The nesttree species is mainly Pistacia chinensis, Thuj i orientalis, etc. The mcasuremets of nests (n=15) are as follows; out-diameter, 470.3±54.9×401.3±71.3, inside-diameter, 286.7±38.3×238.7± 33.8, height, 136.7±31.1, depth, 44.0±8.4mm. The promiscuous copulation occurs more frequently than the normal copulation during the egg-laying period. The clutch size is 4.36 ± 0.82(n=50) eggs, the colour of which is blue-green without any spots and oval m shape, and egg size is 44.57 ± 1.95×32.72±1.05 (n=194)mm, and fresh weight is 26.8 ± 2.4(n = 194)g, the fresh egg density is 1.105±0.006 (n =48)g / cm~3. The water loss rate during incubation is 18.5±1.63% (n=21) in total, and the density before hatching is reduced by 0.901±0.020(n=21)g /cm~3.更多还原