The Population Dynamics of the Yangtze Finless Porpoise in Nanjing Between 2019 and 2023
Nanjing is one of the most densely distributed water area for Yangtze River Finless Porpoises in the main stream of the Yangtze River,which has been widely concerned,but its population dynamics are still unclear.The study has continuously monitored the Yangtze River Finless Porpoise in the waters of the Nanjing Yangtze River Finless Porpoise Provincial Nature Reserve between 2019 and 2023 by conducting a continuous field vessel survey.This article analyzed the dynamic changes in the distribution,home range,and population size of the Yangtze River Finless Porpoise in Nanjing.Through 112 ds of field vessel survey,274 Finless Porpoises were found,mainly in Qianzhou,Jiangxin Island,Sanqiao and Zihuizhou Xinjizhou Waters.The distribution of pufferfish was arranged in an aggregated pattern,as shown by the average nearest neighbor tool test.The minimum convex polygon,95%core density KDE,and 50%KDE family areas for KDE were 50.86 km2,135.54 km2,and 60.81 km2,respectively,12 km2 and 60.81 km2 respectively.The Finless Porpoise population size of the Yangtze River varies with time and season.From 2019 to 2023,the average population size of the Yangtze River Finless Porpoise in the Nanjing section was about 52,60,57,62,and 65,respectively,with spring and winter being higher than autumn and summer.Compared to the past,the increase in population size may be related to measures such as the"Yangtze River Protection",the"10-year Fishing Ban",and the Yangtze River Finless Porpoise rescue action plan.
万方数据
