Monophyletic origin of Lake Victoria cichlid fishes suggested by mitochondrial DNA sequences.
Axel Meyer,Axel Meyer,Thomas D. Kocher,Thomas D. Kocher,Pereti Basasibwaki,Pereti Basasibwaki,Allan C. Wilson +6 more
TLDR
This work sequenced up to 803 base pairs of mitochondrial DNA from 14 representative Victorian species and 23 additional African species to study the 'flock' of cichlid fishes in Lake Victoria.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.read more
Citations
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Journal ArticleDOI
The incomplete natural history of mitochondria
TL;DR: A critical examination of the neglected biology of mitochondria is carried out and several surprising gaps in the state of the authors' knowledge about this important organelle are pointed out.
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On the origin of species by sympatric speciation
Ulf Dieckmann,Michael Doebeli +1 more
TL;DR: This work uses multilocus genetics to describe sexual reproduction in an individual-based model and considers the evolution of assortative mating, which leads to reproductive isolation between ecologically diverging subpopulations and conforms well with mounting empirical evidence for the sympatric origin of many species.
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Hybridization and adaptive radiation
TL;DR: A concept that reconciles views of hybridization and ecological speciation theory is developed and adds a new twist to this debate, which predisposes colonizing populations to rapid adaptive diversification under disruptive or divergent selection.
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INFERRING PHYLOGENIES FROM mtDNA VARIATION: MITOCHONDRIAL-GENE TREES VERSUS NUCLEAR-GENE TREES.
TL;DR: An accurately resolved gene tree may not be congruent with the species tree because of lineage sorting of ancestral polymorphisms, but a survey of mtDNA‐haplotype diversity in 34 species of birds indicates that coalescence is generally very recent, which suggests that coalescent times are typically much shorter than internodal branch lengths of the species Tree, and that sorting of mt DNA lineages is not likely to confound the species trees.
Journal ArticleDOI
Cichlid Fish Diversity Threatened by Eutrophication That Curbs Sexual Selection
TL;DR: Cichlid fish species of Lake Victoria can interbreed without loss of fertility but are sexually isolated by mate choice, and human activities that increase turbidity destroy both the mechanism of diversification and that which maintains diversity.
References
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Thomas D. Kocher,W.K. Thomas,Axel Meyer,Scott V. Edwards,Svante Pääbo,Francis X. Villablanca,Allan C. Wilson +6 more
TL;DR: The polymerase chain reaction is used to amplify homologous segments of mtDNA from more than 100 animal species, including mammals, birds, amphibians, fishes, and some invertebrates, and the unexpectedly wide taxonomic utility of these primers offers opportunities for phylogenetic and population research.
Dynamics of mitochondrial DNA evolution in animals: Amplification and sequencing with conserved primers (cytochrome b/12S ribosomal DNA/control region/evolutionary genetics/molecular phylogenies)
T. D. Kocher,W. K. Thomas,Axel Meyer,Scott V. Edwards,Svante Pääbo,F. X. VILLABLANCAtt,Allan C. Wilson +6 more
TL;DR: This paper used the polymerase chain reaction to amplify homologous segments of mtDNA from more than 100 animal species, including mammals, birds, amphibians, fishes, and some invertebrates.
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