摘要
2022年11月及2023年2月在鄱阳湖松门山南部砂坑水域开展了大规模长江江豚应急救护行动,本文利用救护期间获得的体检数据及后续在该水域实施的长江江豚声学考察成果,首次描述了该水域长江江豚的群体结构和生长状况。该水域长江江豚群体雌雄比约为0.58,妊娠率约为27.8%;平均体长(135.01±16.95) cm,平均体质量(42.37±14.71) kg,平均最大体围(88.32±9.32) cm,平均体质指数(22.83±4.72) kg/m~2,平均体围指数65.88%±5.86%,平均腋下脂肪层厚度(2.51±0.55) cm,平均肛围脂肪厚度(2.47±0.31) cm,平均最大体围脂肪层厚度(2.08±0.34) cm;群体结构中年轻个体占比较大,雄性占比较多,种群呈现增长型;该水域内长江江豚种群密度大于2头/km~2,种群数量约39~111头。整体上看,该水域内长江江豚种群健康状态良好,有很好的繁殖潜力,对该水域及水域内长江江豚种群的关注及保护应加强。
A large-scale emergency rescue operation for Yangtze finless porpoise was carried out in November 2022 and February 2023 in the southern sand pit waters of Songmen Mountain in Poyang Lake.This paper describes the population structure and growth status of Yangtze finless porpoise for the first time,using the physical examination data obtained during the rescue period and the results of the subsequent acoustic survey of Yangtze finless porpoise in this area.The average body length of this population is(135.01±16.95) cm,the average body mass is(42.37±14.71) kg,the average maximum body circumference is(88.32±9.32) cm,the average body mass index is(22.83±4.72) kg/m~2,and the average body circumference index is 65.88%±5.86%.The average thickness of axillary fat layer is(2.51±0.55) cm,the average thickness of anal fat layer is(2.47±0.31) cm,and the average thickness of maximum body fat layer is(2.08±0.34) cm;the population structure was relatively large for young individuals and more males,and the population showed an extended type;the population density of Yangtze finless porpoise in the waters was greater than 2 heads/km~2,and the population size was about 39 to 111 individuals.On the whole,the Yangtze finless porpoise population is in good health and has good breeding potential,and the attention and protection of the Yangtze finless porpoise population should be strengthened.
作者
饶榕城
余进祥
阙江龙
闵佳玲
田镇
戴银根
RAO Rongcheng;YU Jinxiang;QUE Jianglong;MIN Jialing;TIAN Zhen;DAI Yingen(Jiangxi Provincial Aquatic Biology Protection and Rescue Center,Nanchang 330029,Jiangxi,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2023年第6期1237-1244,共8页
Journal of Shanghai Ocean University
基金
江西省长江江豚保护专项(00238888020000142)。
关键词
长江江豚
自然水域
健康评价
种群分布
种群结构
Yangtze finless porpoise
natural waters
health assessment
population distribution
population structure
