What Do the Occurrences of Migratory Fishes in the Upper Mekong Mean?
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This paper examines the recent appearance of four migratory species in the Upper Mekong: Dasyatis laosensis, Anguilla bicolor, Anguilla marmorata, and Chitala ornata. Since 2006 these species have been continually sampled in an area below Jinghong Dam in Xishuangbanna, China. This region is far beyond their historical upstream distribution, and the reasons for these appearances and their subsequent impact on river ecosystem are considered.
KeywordsDam Invasion Sediment Habitat degradation
Thanks to the National Natural Science Foundation of China (U0936602) for funding support and to Xishuangbanna Fishery Supervision and Administer Station for assisting with specimen sampling. Thanks to Xiaoxia Huang for helping the map drawing. I also give deeply sincere thanks to the anonymous reviewers for constructive suggestions and detailed corrections.
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