Abstract:
:Comprehensive phylogenetic analyses utilize data from distinct sources, including nuclear, mitochondrial, and plastid molecular sequences and morphology. Such heterogeneous datasets are likely to require distinct models of analysis, given the different histories of mutational biases operating on these characters. The incongruence length difference (ILD) test is increasingly being used to arbitrate between competing models of phylogenetic analysis in cases where multiple data partitions have been collected. Our work suggests that the ILD test is unlikely to be an effective measure of congruence when two datasets differ markedly in size. We show that models that increase the contribution of one data partition over another are likely to increase congruence, as measured by this test. More alarmingly, for many bipartition comparisons, character congruence increases bimodally - either increasing or decreasing the contribution of one data partition will increase congruence - making it impossible to arrive at a single optimally congruent model of analysis.
journal_name
Syst Bioljournal_title
Systematic biologyauthors
Dowton M,Austin ADdoi
10.1080/106351502753475853keywords:
subject
Has Abstractpub_date
2002-02-01 00:00:00pages
19-31issue
1eissn
1063-5157issn
1076-836Xjournal_volume
51pub_type
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