Clocks, Clades, and Cospeciation: Comparing Rates of Evolution and Timing of Cospeciation Events in Host-Parasite Assemblages
1991; Oxford University Press; Volume: 40; Issue: 2 Linguagem: Inglês
10.1093/sysbio/40.2.188
ISSN1076-836X
Autores Tópico(s)Genetic diversity and population structure
ResumoA recently described test for a consistent pattern of timing of cospeciation between host and parasite taxa uses the correlation between observed genetic distance matrices for the hosts and parasites. In this paper I argue that this method can be improved by comparing trees rather than distance matrices. In the special case of a molecular clock, the test compares cluster heights in dendrograms for the hosts and the parasites. Because tree topology alone can cause a significant correlation between the cluster heights, a randomization test is described that allows for this autocorrelation. The degree of autocorrelation is a function of tree topology, increasing as the trees become more unbalanced. Balanced trees offer more sensitive tests of hypotheses concerning timing of cospeciation. [Bootstrap; cladistics; cospeciation; dendrograms; molecular clock; randomization tests; rates of evolution.]
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