具有独特地理特征的青藏高原分布有大量不同水化学性质的湖泊，生活有较多种属的介形虫，是该地区强有力的古环境生物指标。研究表明青藏高原湖泊中介形虫独具特色，但绝大多数介形虫的生态意义仍不清楚。因此，对青藏高原湖泊中现生介形虫种属的区域性研究，不仅可以加深对介形虫种属生态特征的认识，而且能明确环境因子对介形虫种属的影响，利于对该地区古环境重建。本项研究选择青藏高原中西部地区的100-200个左右不同化学类型湖泊、河流、水洼，及龙木错、班公错、色林错、黑海不同深度表层沉积物中的介形虫，以及对采样点水样、湖泊中活体介形虫进行种属鉴定和壳体元素、水化学分析，了解青藏高原现代湖泊环境中介形虫种属类型及生态特征，明确研究区介形虫种属组合与湖泊环境介质的响应，探讨利用介形虫进行环境转换函数建立时的主要影响因素。

A great number of lakes with various hydrochemistry properties distribute on the Tibetan Plateau with special geographical position and natural environment. Ostracods inhabiting in these lakes usually have special ecological or morphological characteristic, such as diverse species compositions, sizes, sex ratios and so on, which are significantly different from its distribution in other regions. It is a potent biologic indicator of palaeoenvironment. However, the ecological significance of most species is still unclear. For example, Limnocythere inopinata, widely distributed in most type of water bodies, is mainly regarded as a parthenogenesis species. However, quite abundant male valves of Limnocythere inopinata with high retio of male to female are recorded in lakes from interior region of Tibetan Plateau based on our investigation. Meanwhile, some species were found first time on the Tibetan Plateau with regional distribution feature. Besides, whether the existence or absence of tubercle can be an basis for identification remains debates. Therefore, Research on the ostracod species distribution in the lakes with various type in this region will not only enhance understanding on ecological features of ostracod, but also clear and definite the environmental factors impact on ostracod assemblages, which are benefit to the regional palaeoenvironment reconstruction. This study will focus on the surface sediment from 100-200 water bodies with various hydrochemistry properties in central-western Tibetan plateau, such as lake, river and swamp and so on. Meanwhile, the living ostracod, surface samples with different water depth and water samples will be collected from Longmu Co, Bangong Co, Siling Co and Heihai Lake. Based on the sediment, living ostracod identification, shell trace element and hydrochemical analysis, the ostracod assemblages and characteristic will be investigated and the ostracod assemblage response to lake environment will be determined. The major influence factor on the application of ostracod-based transfer functions will be discussed as well.