Mollusk is an important indicator of water pollution and eutrophication takes more responsibility for their death. From 1940s till the early 21 century, the freshwater mollusk of the Lake Dianchi has been decreased from 31 species, 2 sub-species to 16 species, 1 sub-species due to eutrophication, and for more specifically, the benthic species (eg. margarya melanoides, anodonta woodiana woodiana) decreased, while the neustic species (eg. radix sp., hippeutis sp.)increased(http://www.sciencedirect.com/science/journal/00759511).

2005-2008, DU Lina of Kunming institute of Zoology (the Chinese Academy of Sciences) and her colleges evaluated the molluscan community composition in the Lake Dianchi and for the first time compared the recent research results with the history record and extended the sampling scope from the lake body to its’ drainage area. According to the author, although some endemic species have disappeared in the lake body, they still distribute in the springs and upstream rivers, so more attention should be given to those areas.

This work was funded by a GEF median size project (Lake Dianchi freshwater biodiversity restoration project, TF051795),Development Marketplace Global Competition Project (DM01333)and Yunnan Provincial Science and Technology Department Social Development Science and Technology Plans (2008CA001).