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Phenotypic covariance structure in tamarins (genus Saguinus ): a comparison of variation patterns using matrix correlation and common principal component analysis
Author(s) -
Ackermann Rebecca Rogers,
Cheverud James M.
Publication year - 2000
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/(sici)1096-8644(200004)111:4<489::aid-ajpa5>3.0.co;2-u
Subject(s) - principal component analysis , phylogenetic tree , variation (astronomy) , evolutionary biology , biology , divergence (linguistics) , covariance , similarity (geometry) , lineage (genetic) , zoology , statistics , mathematics , genetics , artificial intelligence , linguistics , physics , philosophy , gene , astrophysics , computer science , image (mathematics)
Constancy of variation/covariation structure among populations is frequently assumed in order to measure the differential selective forces which have caused population differentiation through evolutionary time. Following Steppan ([1997] Evolution 51:571–594), this assumption is examined among closely related tamarin species (genus Saguinus ), using two distinct approaches applied to the task of evaluating similarity in patterns of morphological variation: common principal component analysis and matrix correlations. While the results of these analyses may appear contradictory, closer examination reveals them as complementary, highlighting the wisdom of combined methodologies. Overall, the results reveal a close relationship among the morphologically based variance structures of the tamarin species a relationship whose pattern is consistent with the pattern of phylogenetic relatedness as found via a molecular genetic study. More specifically, both methodological approaches provide some support for divergence of S . geoffroyi and S . oedipus (with regards to their patterns of morphological variation) from other tamarin species. This suggests that variance/covariance structure may have diverged through evolutionary time in the tamarin lineage, placing assumptions of constancy in doubt. Am J Phys Anthropol 111:489–501, 2000. © 2000 Wiley‐Liss, Inc.