Survey on Population Density of Crab-eating Frog in Mangrove Tidal Ditch,Hainan Dongzhaigang National Nature Reserve
In order to understand the population abundance and dynamic of crab-eating frog(Fejervarya cancrivora)in the mangrove of Hainan Dongzhaigang National Nature Reserve,34 line transects were investigated in tidal ditches of man-grove from 2020 to 2022.Further,the risk factors affecting the frog population in the reserve were analyzed,and some sug-gestions on protection and management were informed.The results showed that crab-eating frogs mainly distributed in the regions of Management Bureau,Daoxue and Sanjiang,but absent in Tashi and Bodu.The population density of crab-eating frog was highest in Sanjiang,then in Daoxue and lowest in Management Bureau.The population density of Sanji-ang,Daoxue,Management Bureau were 221.6 individuals/hm2,164.7 individuals/hm2,137.4 individuals/hm2 respectively in 2020,which was significantly higher than that in 2022(151.2 individuals/hm2 in Sanjiang,144.8 individuals/hm2 in Da-oxue and 116.3 individuals/hm2 in Management Bureau)and 2021(113.2 individuals/hm2 in Sanjiang,99.6 individuals/hm2 in Daoxue and 51.9 individuals/hm2 in Management Bureau).The total population of Sanjiang,Daoxue and Manage-ment Bureau were 6,498,3,357,4,847 respectively from 2020 to 2022.Higher salinity,water pollution,epiphytic oyster and small tidal bare beach area were the main factors leading to the absence of crab-eating frog in Tashi and Bodu.The ille-gal capture,reduction of breeding habitats and pollution caused by aquaculture ponds are threatening factors to the popula-tions of crab-eating frog.
万方数据
维普
