Population Dynamics and Diversity of Dragonflies in Baiyangdian Wetland
The Baiyangdian Wetland Nature Reserve is situated in Xiong'an New Area,Hebei Province.From January 2021 to December 2022,a bi-monthly survey of Odonata was conducted in seven representative areas.Through species identification and statistical analysis,the abundance and diversity indices of Odonata were examined.The findings revealed a total of 21 species from 17 genera and 6 families within the Odonata,with the Libellulidae exhibiting the highest number of species at 52.38%of the total,followed by Coenagrionidae at 23.81%,which represented an increase of four species compared to previous surveys.Ischnura elegans emerged as the most dominant species alongside four other dominant ones:Ischnura asiatica,Paracercion plagiosum,Crocothemis servilia and Rhyothemis fuliginosa.A total count of 2 724 adult Odonata was recorded during the two-year survey period while June showing the highest species abundance and richness observed while July exhibited the highest Shannon-Wiener diversity index.In compared with Shannon-Wiener diversity index H′,Pielou evenness index and interspecific random encounter rate PIE,Margalef richness index showed significant discrimination in monthly Odonata communities in Baiyangdian wetland and proved more suitable for evaluating population dynamics of Odonata in this area.
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