Bird Diversity And Dynamics In The Breeding Season Of Guangxi Damingshan Nature Reserve

Bird diversity is an important part of biodiversity,and it has become a hot spot in the study of bird ecology and conservation biology.Damingshan National Nature Reserve is one of the 40 protected areas of global significance in China and one of the hot spots of global biodiversity.In accordance with the requirements of the Global Environment Facility(GEF)project,this study began in 2008 to set up 8 bird monitoring transect lines in the DamingshanNature Reserve to conduct long-term monitoring of birds during the breeding season,2008-2012.The main results are as follows:(1)After continuous monitoring of 8 sample bands in the DamingshanReserve for 5 years,71 species of bird,belonging to 8 orders and 25 families,were observedin the breeding season of the Darning Mountain Reserve.Among them,58 species of resident birds,accounting for 81.69%,and 12 species of summer migratory birds,accounting for 18.31%,respectively.The Oriental patternaccounts for a significant advantage(49 species),accounting for 69.01%;Followed by South Chinapattern(12 species),accounting for 16.90%.There are not many species in the wide-range and Himalayan-Hengduanshan pattern,which are 4 species and 3 species,respectively,accounting for 5.63%and 4.23%.(2)According to continuous 5-yearsmonitoring,a total of 3,574 individual birds were recorded,withGrey-cheeked FulvettaAlcipe morrisonia having the largest number of individuals,622,followed by the Red-billed LeioihrnxLeiotherix lutea,Chestnut BulbulHimeixos castanotitus and Black-chinned YuhinaYuhina nigrimenta.The number of individuals is 311,287 and 234,respectively.These four bird species only accounted for 5.63%of the total number of recorded bird species,but their number of individuals accounted for 40.68%of the total number of individuals,indicating that they are the main contributors to the number of individual birds in the DamingshanReserve.(3)Of the 71 species of birds recorded,a total of 7 species of birds with a distribution frequency of 100%accounted for 9.86%of the recorded bird species.A total of 12 species of birds with a frequency of 75%to 87.5%,accounting for 12.90%,and a total of 16 species of birds with a frequency of 37.5%to 62.5%,accounting for 22.54%.There are 35 species of birds with a frequency of 12.5 to 25.5%(only distributed on 1 to 2 transects),accounting for 49.30%.It shows that the proportion of bird species with low frequency distribution in the breeding season of DamingshanReserve is very high.(4)The birds with important values in the breeding season of the Damingshan Nature Reserve areGrey-cheeked Fulvetta,Chestnut Bulbul,and Red-billed Leiothrix,with important values of 10.38,5.70,and 5.61,respectively.Obviously,they are the dominant species of bird communities in the breeding season of the DamingshanReserve.The species richness,Simpson index,Shannon-Weiner index,and evenness index of the bird community in the breeding season of the DamingshanReserve vary from 15 to 19.6 species,0.8706 to 0.9091,2.38 to 2.62,and 0.8493 to 0.8995,respectively.According to the vegetation type statistics,the four indices are slightly higher in secondary forests than in Evergreen broad-leaved forests and mountainous evergreen broad-leaved forests,but only the uniformity index of secondary forests is significantly different from that of evergreen broad-leaved forests.(6)The dynamics of bird communities during the breeding season in DamingshanReserve,5-yearscontinuous monitoring results showed that the similarity coefficient between 5aof evergreen broad-leaved forests was between 0.4815-0.6364,and the main composition of bird communities during the year was moderately similar.In contrast,the similarity coefficient between secondary forests 5ais between 0.1818-0.7000,and the similarity coefficient for most years,respectively.