Abstract:
:Lake Victoria, together with its satellite lakes, harbours roughly 200 endemic forms of cichlid fishes that are classified as 'haplochromines' and yet the lake system is less than a million years old. This 'flock' has attracted attention because of the possibility that it evolved within the lake from one ancestral species and that biologists are thus presented with a case of explosive evolution. Within the past decade, however, morphology has increasingly emphasized the view that the flock may be polyphyletic. We sequenced up to 803 base pairs of mitochondrial DNA from 14 representative Victorian species and 23 additional African species. The flock seems to be monophyletic, and is more akin to that from Lake Malawi than to species from Lake Tanganyika; in addition, it contains less genetic variation than does the human species, and there is virtually no sharing of mitochondrial DNA types among species. These results confirm that the founding event was recent.
journal_name
Naturejournal_title
Natureauthors
Meyer A,Kocher TD,Basasibwaki P,Wilson ACdoi
10.1038/347550a0subject
Has Abstractpub_date
1990-10-11 00:00:00pages
550-3issue
6293eissn
0028-0836issn
1476-4687journal_volume
347pub_type
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