Analysis of Complementary Effect of the Bait-Trap Method to the Line Transect Method in Butterfly Monitoring

WEN Xin; LI Biyue; YAO Kaiping; ZHANG Zhehai; SUN Jiemei; ZHOU Yan

doi:10.19672/j.cnki.1003-6504.0104.25.338

Abstract：We aimed to analyze the complementary effect of the bait-trap method to the line transect method in butterfly mon-itoring application in China,compare the differences between the two methods,and contribute to monitoring and protection of agricultural biodiversity.The line transect method and bait-trap method were used to investigate the butterfly diversity in Chen-zhuang,Jurong,Jiangsu Province.The results of the investigation were analyzed and compared in terms of the number of spe-cies,individuals,dominant species and individuals of Polygonia c-aureum.The number of species and individuals recorded by line transect method was higher than that by bait-trap method.All families of butterflies were recorded by line transect method while Pieridae count most.98.4％of the individuals caught by the bait-trap method were Nymphalidae,meanwhile other fami-lies are seldom caught,especially no record with Papilionidae.The monthly dynamics of P.c-aureum reflected by the two methods were almost same.The individuals of P.c-aureum recorded maintained low level from May to July,and reached peak in the second half of August,while decreasing in September.The bait-trap method has its unique application advantages and plays a complementary role to the line transect method.However,the bait-trap method showed limitation when used in the mid-dle latitudes of China.The line transect method should be preferred and the bait-trap method could be used as a supplement in butterfly monitoring.Furthermore,the bait-trap method is more effective when conducting Nymphalidae monitoring.