Taxonomy and distribution of diatoms in the genus Eunotia from the Da'erbin Lake and Surrounding Bogs in the Great Xing'an Mountains, China
Liu, Yan; Wang, Quanxi; Fu, Chengxin
Located in the southwestern region of the Great Xing'an Mountains, Da'erbin lake is characterized by extensive acid bogs surrounding the lake. The taxonomy of its diatom flora is poorly documented, although diatoms are recognized as important indicators of the environment. From July 2004 to May 2006, the diatom flora of the Da'erbin Lake habitats and its surrounding bogs was investigated. Collections were made at an altitude of 1288-1310 m from habitats with pH values between 4.3-10.2. Eunotia was one of the dominant genera in this area and had high diversity (28 taxa). The composition of the Eunotia assemblages differed among the habitats and seasons surveyed in this study. Some species were found in all habitats whereas others seemed to be restricted to one habitat. The maximum diversity was found in the bog habitats during summer while the minimum was found in material collected in the lake during spring. Both acidobiontic and acidophilous taxa were observed. Taxonomic descriptions and ecological affinities are provided and compared to reports in the literature. Species newly recorded from China include E. botuliformis, E. crassula, E. lunaris var. sicula, E. muscicola var. perminuta, E. nymanniana and E. ursamaioris.