Biological invasion is a pervasive negative force of global change, especially in its effects on sensitive freshwater ecosystems. Even protected areas are usually not immune. Ptychobarbus chungtienensis is a threatened freshwater fish now almost confined to Bita Lake, in the Shangri-La region of Yunnan province, China. Its existence is threatened by the introduction of non-native weatherfishes(Misgurnus anguillicaudatus and Paramisgurnus dabryanus) by an unusual method known as ‘prayer animal release'. Periodic surveys revealed the ratio of invasive weatherfishes to P. chungtienensis has been increasing since the former species was first recorded from the lake in August, 2009. Ptychobarbus chungtienensis shows low genetic diversity in the relict Lake Bita population. Weatherfishes, however, have highly successful survival strategies. The degree of dietary overlap between the species is alarming and perhaps critical if food is found to be a limiting factor.
Wan-Sheng JIANGTao QINWei-Ying WANGYa-Peng ZHAOShu-Sen SHUWei-Hong SONGXiao-Yong CHENJun-Xing YANG
The genus Simocephalus Schoedler 1858,a large,nonpelagic daphniidae,are abundant in the littoral zone,expecially with submerged aquatic vegetation in freshwater bodies all over the world.More than 63 specific and subspecific names have been proposed.But in the recent research,all of them were divided into 4 subgenus and regarded as 20valid names[1].
