Study On Fauna Of Sawflies On Mt. Changbai

From May 9th to August 22nd in 2014, the author surveyed the sawfly fauna of Mt. Changbai for about more than 80 days. Totally 6562 sawfly specimens were collected. Together with other specimens deposited in the Sawfly Collection of the Lab of Insect Systematics and Evolutionary Biology (LISEB), which were collected from Mt. Changbai by the leagures of LISEB in the past 20 years,70 sawfly genera and 244 species and subspecies have been identified. Among them,1 genus, Armitarsus Malaise, is a genus new to the fauna of China. Thirty-seven species are recorded for the first time in China, and 71 species have been identified as new to science, three of them are described in this thesis:Taxonus maculotibialis Wei & Chu, sp. nov., Taxonus fuscipennis Wei & Chu,, sp. nov., Taxonus minicarbonarius Wei & Chu, sp. nov.The fuanal elements and the distribution pattern of the sawfly genera and species of Mt. Changbai are analysed. At generic level,14 genera are widely distributed in the world, at least distributing in two zoogeographical regions,16 genera are Palaearctic elements,40 are East Asian (including East Asia to Northeast Asia, Northeast Asia, and those endemic to Mt. Changbai), accounted for 20%,22.9%, 57.1% separately. The East Asian elements are much dominantcompring with other components. The result shows that the sawfly fauna of Mt. Changbai belongs to East Asia Region. Amont the East Asian elements,12 genera belonging to the East Asian to Northeast Asian slements, accounted about 17.1%; 18 genera belonging to the Northeast Asia, accounted 25.7%, and 10 genera being endemic to the region of Mt. Changbai, accounted about 14.3%. The Northeast Asian elelments is clearly but not much more than other elements.At species level,20 species widely distributes in more than 2 zoological regions, 46 species being of Palaearctic, and 178 species being of East Asian, with ratio about 8.2%,18.9%,72.9% separately. Nearly three quarters of recorded species in Mt. Changbai belongs to the East Asian Elements, which take a distinct advantage over others. In the East Asian Elements,52 species belonging to East Asian to Northeast Asian subelements with ratio about 21.3%; 71 species belonging to Northeast Asian subelements, about 29.1%; 55 species being endemic to Mt. Changbai of Jilin with ratio about 22.5%.The sawfly faunal similarity between Mt. Changbai and some nearby countries and regions are calculated using the dual similarity indices by Jaccard. The result shows that the similarity between Mt. Changbai and East Siberia of Russia, Korea and Japan, are higher than 0.1, and the highest similarity appeared in Mt. Changbai and East Siberia, which is 0.328, followed by Korea ang Japan, similarity for 0.217,0.173. The Jaccard similarity indices bewteen Mt. Changbai and other regions are less than 0.1.Based on the above results, the sawfly fauna of Mt. Changbai seems belonging to the East Asian Region but it is strongly affected by the sawfly fauna of Palaearctic Region.