Dove And Lice: A Hypothesis-Based Report

Decent Essays
“Linking Coevolution History to Ecological Process: Dove and Lice” is a hypothesis-based article by Clayton and Johnson (2003). This hypothesis was tested through comparison of data using the reconstruction and analyses of phylogenetic trees. In this study, a 1045 base-pair portion of the mitochondrial cytochrome b gene and the nuclear β-fibrinogen intron 7 gene was sequenced for 13 species of doves. For lice, DNA was extracted by removing the head from the body and amplified using PCR. A tree was constructed using equally weighted parsimony and 1000 replicates of bootstrap analyses. Maximum likelihood analysis was used and 100 maximum-likelihood bootstrap resampling replicates were constructed. Cophylogenetic analyses involved using comparisons of host and parasite trees that resulted from equally weighted…show more content…
Unweighted parsimony analysis of combined gene regions of wing lice also produced a single tree. Maximum-likelihood analysis produced a tree that was mostly similar to the parsimony tree. In this tree, four of eight branches resulted in over 50% of bootstrap replicates. Unweighted parsimony analysis of body lice produced a single tree where eight of eleven nodes resulted in over 70% of bootstrap replicates. Maximum-likelihood analysis produced a tree that was mostly similar to the parsimony tree and resulted in eight of eleven nodes supporting over 60% of bootstrap replicates. Cophylogenetic analysis of wing lice and dove phylogenies showed three or four cospeciation events in likelihood and parsimony trees which was found to not be more than expected by chance. For body lice, there were eight cospeciation events. This was more than what could have happened by chance. When wing lice was forced to be 100% host specific, the same amount of cospeciation events
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