|Red-eared Sliders, one of the invasive alien species in Lake Dianchi. See full photogallery.|
Perhaps the lake’s most famous invasive alien is the pretty, purple-flowered Water Hyacinth from Brazil which once covered vast areas of the lake and which the authorities worked hard to (almost entirely) eradicate. Interestingly, the project team found that the roots hanging beneath these floating plants are major resting and feeding places for aquatic invertebrates (aka fish food) which would normally graze on the algae found on the surface of submerged macrophytes. The conclusion must be that totally eradicating the Water Hyacinth before restoring the native macrophytes could cause problems of its own.
|The Grass Carp, a herbivore whose grazing habits are probably a major reason that Lake Dianchi has lost most of its macrophytes. See full photogallery.|