scholarly journals On the age and origin of the species flock of haplochromine cichlid fishes of Lake Victoria

2001 ◽  
Vol 268 (1472) ◽  
pp. 1147-1152 ◽  
Author(s):  
Geoffrey Fryer
Keyword(s):  
Lake Victoria ◽  
Species Flock ◽  
Cichlid Fishes ◽  
Haplochromine Cichlid

scholarly journals Back to Tanganyika: a case of recent trans-species-flock dispersal in East African haplochromine cichlid fishes

2015 ◽  
Vol 2 (3) ◽  
pp. 140498 ◽  
Author(s):  
Britta S. Meyer ◽  
Adrian Indermaur ◽  
Xenia Ehrensperger ◽  
Bernd Egger ◽  
Gaspard Banyankimbona ◽  
...  
Keyword(s):  
Lake Tanganyika ◽  
Lake Victoria ◽  
Species Flock ◽  
East African ◽  
Cichlid Species ◽  
African Great Lakes ◽  
Cichlid Fishes ◽  
Haplochromine Cichlid ◽  
Lake Victoria Region ◽  
Adaptive Radiations

The species flocks of cichlid fishes in the East African Great Lakes are the largest vertebrate adaptive radiations in the world and illustrious textbook examples of convergent evolution between independent species assemblages. Although recent studies suggest some degrees of genetic exchange between riverine taxa and the lake faunas, not a single cichlid species is known from Lakes Tanganyika, Malawi and Victoria that is derived from the radiation associated with another of these lakes. Here, we report the discovery of a haplochromine cichlid species in Lake Tanganyika, which belongs genetically to the species flock of haplochromines of the Lake Victoria region. The new species colonized Lake Tanganyika only recently, suggesting that faunal exchange across watersheds and, hence, between isolated ichthyofaunas, is more common than previously thought.

scholarly journals Identification of a novel sex determining chromosome in cichlid fishes that acts as XY or ZW in different lineages

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Anna F. Feller ◽  
Vera Ogi ◽  
Ole Seehausen ◽  
Joana I. Meier
Keyword(s):  
Sex Determination ◽  
Sex Chromosome ◽  
Lake Victoria ◽  
Interspecific Crosses ◽  
Turnover Rates ◽  
Cichlid Fishes ◽  
Haplochromine Cichlid ◽  
Adaptive Radiations ◽  
Heterogametic Sex

AbstractSex determination systems are highly conserved among most vertebrates with genetic sex determination, but can be variable and evolve rapidly in some. Here, we study sex determination in a clade with exceptionally high sex chromosome turnover rates. We identify the sex determining chromosomes in three interspecific crosses of haplochromine cichlid fishes from Lakes Victoria and Malawi. We find evidence for different sex determiners in each cross. In the Malawi cross and one Victoria cross the same chromosome is sex-linked but while females are the heterogametic sex in the Malawi species, males are the heterogametic sex in the Victoria species. This chromosome has not previously been reported to be sex determining in cichlids, increasing the number of different chromosomes shown to be sex determining in cichlids to 12. All Lake Victoria species of our crosses are less than 15,000 years divergent, and we identified different sex determiners among them. Our study provides further evidence for the diversity and evolutionary flexibility of sex determination in cichlids, factors which might contribute to their rapid adaptive radiations.

The destruction of an endemic species flock: quantitative data on the decline of the haplochromine cichlids of Lake Victoria

1992 ◽  
Vol 34 (1) ◽  
pp. 1-28 ◽  
Author(s):  
Frans Witte ◽  
Tijs Goldschmidt ◽  
Jan Wanink ◽  
Martien van Oijen ◽  
Kees Goudswaard ◽  
...  
Keyword(s):  
Endemic Species ◽  
Quantitative Data ◽  
Lake Victoria ◽  
Species Flock ◽  
Haplochromine Cichlids
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