. The Compleat cladist : a primer of phylogenetic procedures. Cladistic analysis; Zoology -- Classification; Phylogeny. COEVOLUTIONARY STUDIES 117 NA EU AS SA AF. Fig. —The among five continents based on geologic evidence and the relationships among amphilinid flatworms. See text for abbreviations. When we solve the relationships among the areas based on the area/taxon matrix, we find the same hypothesis. Thus, the relationships among areas as detemiined from geologic data and from amphilinid phylogeny are congruent. We may also estimate the level of congruence by mapping (f
. The Compleat cladist : a primer of phylogenetic procedures. Cladistic analysis; Zoology -- Classification; Phylogeny. COEVOLUTIONARY STUDIES 117 NA EU AS SA AF. Fig. —The among five continents based on geologic evidence and the relationships among amphilinid flatworms. See text for abbreviations. When we solve the relationships among the areas based on the area/taxon matrix, we find the same hypothesis. Thus, the relationships among areas as detemiined from geologic data and from amphilinid phylogeny are congruent. We may also estimate the level of congruence by mapping (fitting) the data for amphilinids directly onto the geologic hypothesis of the relationships among the continents. This approach treats the tree of continents as the independent variable. The matrix derived from the dependent variable (the continent x amphilinid matrix) could then be fitted to the hypothesis of continental relationships. This is easily accomplished in most computer programs such as PAUP, where we build a matrix, specify a particular tree (not necessarily derived from the matrix), and fit the matrix to the tree. We can then calculate an appropriate summary statistic. In this case, we select the CI, deleting the distributions of terminal taxa, and obtain a perfect fit (CI = ). Note on single group analysis. Although this kind of analysis was originally designed to investigate biogeographic and coevolutionary problems, you might find it suitable for exploring other kinds of problems. For example, you and Dr. Fenetico have reconstructed different phytogenies for the saber-toothed cnidaria. You might use your tree as the independent variable and Dr. Fenetico's data as the dependent variables. One very pleasing result might be the discovery that his data fit your tree better than they do his tree. Single Tree Exercises In the exercises below, 1) code the tree, and 2) solve the relationships among the independent variables. Do not be confused by distributions and
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