!exclusive! — Earth Lakes Are Under Threat Reading Answers

(Fisheries give employment to over 100,000 people).

Invasive species represent another formidable challenge. The opening of shipping canals and the discharge of ballast water have allowed species such as the spiny water flea and the sea lamprey to colonise new lakes. Once established, invasive species are nearly impossible to eradicate. For example, the introduction of the Nile perch to Lake Victoria triggered the extinction of over 200 endemic cichlid species, devastating local fisheries that had relied on native fish. earth lakes are under threat reading answers