In this study we report the first animal invasion, to our knowledge, into Lake Malawi. The colonizer is a non‐native morph of the gastropod Melanoides tuberculata that differs substantially in external shell characters from co‐occurring indigenous forms. However, because the species possesses extensive within‐Africa geographical variation in shell morphology, it was unclear whether the invasion was range expansion of a native...

During the years 1984–1987 Lake Victoria in East Africa experienced what is probably the largest mass extinction of contemporary vertebrates. Within a decade about 200 endemic species of haplochromine cichlids disappeared. The extinctions that occurred in the 1980s have been documented predominantly on species of offshore and sub‐littoral waters in the Mwanza Gulf of southern Lake Victoria. Although the littoral fauna of south...