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Detrended correspondence analysis in the ordination of data for phenetics and cladistics
Author(s) -
Parnell J.,
Waldren S.
Publication year - 1996
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1222587
Subject(s) - ordination , detrended correspondence analysis , cladistics , categorical variable , cladogram , correspondence analysis , taxon , biology , concordance , statistics , phylogenetic tree , evolutionary biology , mathematics , ecology , bioinformatics , gene , biochemistry
Summary Parnell, J. & Waldren, S.: Detrended correspondence analysis in the ordination of data for phenetics and cladistics. – Taxon 45: 71‐84. 1996. – ISSN 0040‐0262. Most methods of morphometric and phylogenetic analysis do not permit the incorporation of both categorical and quantitative data. Detrended correspondence analysis (DCA) was used to produce ordination diagrams of strictly categorical data from a cladistic analysis, and mixed data from a morphometric study of hybridization. In both cases it proved preferable to standardize the data prior to DCA, because increased separation on ordination was found when larger scale ranges were used. A standardization is suggested, such that characters are scaled on a range from 1 to the total number of characters scored; this will produce more informative ordinations if large numbers of characters are scored. When used in conjunction with appropriate cladograms this phenetic technique may help reveal features such as homoplasy which are not readily apparent in cladograms, while the capability of DCA to combine both categorical and quantitative characters is especially useful in morphometric studies and in areas of evolutionary biology, e.g. chronistic studies of extinction events in morphospace.