鄂尔多斯高原拟步甲物种多样性与区系分布

SPECIES DIVERSITY AND FAUNA DISTRIBUTION OF DARKLING BEETLES(COLEOPTERA:TENEBRIONIDAE) ON THE ORDOS PLATEAU

依据内蒙古鄂尔多斯高原考察获得的2亚科9族24属72种拟步甲分析,构成该地区拟步甲物种多样性的主体有4个族,分别是土甲族Opatrini、鳖甲族Tentyriini、琵甲族Blaptini和漠甲族Pimeliini,共计20属65种,分别占该地区总属和种数的83.3%和90.3%;在属级组成上,以漠土甲属Melanesthes(11种)、琵甲属Blaps(10种)、东鳖甲属Anatolica(9种)、小鳖甲属Microderao(8种)最占优势,占到总种数的52.8%。在区系成分的构成上,鄂尔多斯高原拟步甲全部隶属中亚亚界蒙新种类和华北种类,前者72种(100.0%),后者与前者共有种22种(30.6%),其他区系成分(青藏区、东北区、华中区、西南区、华南区)仅有16种(22.2%)。在内蒙古地域分布上,该区拟步甲与内蒙古高原(241种)的共有种53个(73.6%),与黄土高原共有种20个(27.8%),地方特有种7个(9.7%)。依据自然条件将鄂尔多斯高原分成4个区域,拟步甲物种数量(含共有分布种)在各小区的分布由多到少依次是:毛乌素小区68种(94.4%)>库布齐小区26种(36.1%)>桌子山小区16种(22.2%)>黄土丘陵小区20种(27.7%)。

The darkling beetles of the Ordos Platean based on 72 species belonging to 25 genera, 9 tribes and 2 subfamily was analyzed, the result shows that the predominant tribes are Opatrini, Tentyriini, Blaptini, Pimeliini and Pimeliini, altogether consisting of 65 spe- cies and 20 genera, accounting for 90.3% and 80.0% of the region~ total genera and species respectively. The predominant genera are Microderao （11 species）, Blaps （10 species）, Anatolica （9 species） and Melanesthes （8 species） in general composition, taking for 52.8% of the total species. The darkling beetles of the Ordos Plateau belongs to Mongolo - Xingjiang Region species （72 species, 100. 0% ） and North China species （22 species, 30.6% ） of Central Asian subrealm on the faunal composition, Qinghai - Xizang Re- gion, Northeast Region, Mid -China Region, South -west Region and South China Region account for 22.2% （16 species）. There are 53 （73.6%） common species with the Inner Mongolia Plateau （241 species） and 20 （27.8%） common species with the Loess Plat- eau, endemic species 7 species （9.7%）. The Ordos Plateau was divided into four small regions based on the natural conditions, The number and percentage of species （including common species） are as following： Maowusu Region （68 species, 94.4% ） 〉 Kubuqi Re- gion （26 species, 36.1% ） 〉 Zhuozishan Region（ 16 species, 22.2% ） 〉 Loess Hills Region （20 species, 27.7% ）.