【摘要】 苍鹭是我国沼泽地常见大型水鸟。每年3月末至4月中旬到达黑龙江省沼泽地繁殖,有树栖和地栖两种类型。树栖型筑巢时间为15—25d,孵化期26—28d;地栖型筑巢时间7—15d,孵化期24—26d。需60d雏鸟才能离巢。雏鸟各器官增长呈逻辑斯谛形式。重、长系数公式为W=0.009 3L^1.849。孵化率为59％,平均每窝飞出幼鸟为1.96只。更多还原

【Abstract】 The breeding habits of the grey heron （Ardea cinerea） were studied in the Heilongjiang province, China. There are two types of the nesting sites, tree site and ground site, in the grey heron which migrated to Heilongjiang marshland for reproduction in the late March and the middie April every year. 15—25days of nesting and 26—28days of incubation were needed for tree site herons, and 7—15 days of nesting and 24—26days of incubation for the ground site ones. The altricial fledglings had to stay in nests for 60 days before they leaving. Fledglings growed in the LOGISTIC model and the coefficient formula of weight and length is W=0. 0093L^1.849. The incubation rate is 59% and the average number of young birds per nest is 1.96.更多还原