温度对扬子鳄卵野外孵化的影响  

INFLUENCE OF TEMPERATURE ON EGG INCUBATION OF THE WILD CHINESE ALLIGATOR (ALLIGATOR SINENSIS)

作　　者：何利军[1] 王小明[1] 丁由中[1] 邵民[2] 汪国宏[2] 谢万树 John THORBJARNARSON 

机构地区：[1]华东师范大学生物系,上海200062 [2]安徽省扬子鳄繁殖研究中心,安徽宣州242000 [3]Wildlife Conservation Society,newyorkusa10460

出　　处：《动物学报》2002年第3期420-424,共5页ACTA ZOOLOGICA SINICA

基　　金：美国野生动物保护协会 (WCS)和上海"曙光计划"资助项目~~

摘　　要：Influence of temperature on egg incubation of the wild Chinese alligator was studied during the summer seasons of 1999 and 2000(July to October and August to September,respectively)at three observation sites, Zhuangtou of Xuanzhou County,Shuangkeng and Zhongqiao of Jingxian county, Anhui Province. One nest at each of the above sites was monitored, bearing 19,17 and 19 eggs,respectively. According to the width of the band on the eggs, we estimated the dates that the eggs were laid. We recorded both the nest temperature and atmosphere temperature with an automated temperature data logger (HOBO Temp) during the whole observation period.We found that the average nest temperature maintained around 25 26℃ during incubation throughout day and night,within over two thirds of time in each day the nest temperature being higher than the atmosphere temperature. Analysis of our data revealed that alligator nests have buffering effect on the inside temperature. Higher nest temperature (27 30℃)increased the hatching rate. It was also noticed that the hatching rate varied considerably from site to site(between 0 100%). We conclude that climate is an important factor influencing egg hatching in the wild, and prolonged rainy season which caused large temperature fluctuation can decrease the hatching rate of the alligator eggs.Influence of temperature on egg incubation of the wild Chinese alligator was studied during the summer seasons of 1999 and 2000(July to October and August to September,respectively)at three observation sites, Zhuangtou of Xuanzhou County,Shuangkeng and Zhongqiao of Jingxian county, Anhui Province. One nest at each of the above sites was monitored, bearing 19,17 and 19 eggs,respectively. According to the width of the band on the eggs, we estimated the dates that the eggs were laid. We recorded both the nest temperature and atmosphere temperature with an automated temperature data logger (HOBO Temp) during the whole observation period.We found that the average nest temperature maintained around 25 26℃ during incubation throughout day and night,within over two thirds of time in each day the nest temperature being higher than the atmosphere temperature. Analysis of our data revealed that alligator nests have buffering effect on the inside temperature. Higher nest temperature (27 30℃)increased the hatching rate. It was also noticed that the hatching rate varied considerably from site to site(between 0 100%). We conclude that climate is an important factor influencing egg hatching in the wild, and prolonged rainy season which caused large temperature fluctuation can decrease the hatching rate of the alligator eggs.

关 键 词：温度 扬子鳄卵 野外孵化 

分 类 号：Q959.64[生物学—动物学]