A Study On The Diversity Of True Bugs Of Wucuagou And Wulan River Area In The Middle Section Of Daxing'anling Mountains

The middle section of the Daxing'anling Mountains spans the three northeast regions and is located in the ecological transition zone with high biodiversity.In order to understand the species composition,sequential variation,distribution and faunal characters of true bugs of Daxing'anling middle area,we surveyed the community composition of true bugs from June 2019 to August 2020 in 9 kinds of selected habitat types in Wuchagou and Wu Lan River areas.The research results are as follows:1.A total of 6,576 true bugs specimens were collected in this study,which were identified as belonging to 95 species,63 genera and 17 families.The species distributed in all habitats include Eurydema gebleri?Carpocoris purpureipennis?Dolycoris baccarum?Dolichonabis americollmbatus ? Stictopleurus minutes ? Stictopleurus viridicatus ?Stictopleurus crassicornis ? Chorosoma macilentum ? Ortholomus punctipennis?Ortholomus batui.The family Pentatomidae had the highest number of genera,Lygaeidae with the largest number of individuals,and Chorosoma macilentum with the highest individuals;Pentatomidae had the highest Shannon diversity index,Pielou evenness index and Margalef richness index.2.There were obvious differences in diversity index of the true bugs in different habitats.Shannon diversity index was the highest in Betula platyphylla forest,the beach meadow habitat with the highest Pielou evenness index,the Deciduous coniferous forest habitat with the highest Berger-Parker dominance index and the swamp meadow habitat with the highest Margalef richness index.The Mountain deciduous broad-leaf forest contained the largest number of true bugs families,the Mountainous grassland habitat with the largest number of genera,the farmland with the largest number of species and the wetland meadow habitat with the lowest number of families,genera,species,and individuals.3.The species,quantity and diversity of true bugs of different month changed significantly.Both number of species and Margalef richness were the highest in July.Number of individuals,Shannon diversity index and Pielou evenness index were the highest in August.4.Similarity analysis showed that July and August had more common species,and with higher similarity index;among all habitats,the Betula platyphylla forest and Mountainous grassland habitat had the highest similarity.5.There were significant differences in the niche breadth of the true bugs.The time and space niche breadth of Pentatomidae were the highest,and the spatial niche overlaps index of Acanthosomatidae and Plataspidae was the highest.Plinthisidae and Alydidae had the highest time niche overlaps index.Most species had strong competition in resource utilization and with similar distribution.The niche differentiation of entire area was not high.6.The species-abundance histograms of true bugs were all close to log-normal distribution,and the dominant groups of different habitats were in different epochs,and mainly concentrated in 4-6 epochs;The peaks of the combined curve skewed to the left,and there were more species with fewer individuals.7.The analysis of fauna showed that the Palaearctic species occupied an absolute predominance,and the single-region Mengxin region had the largest number of species.