. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Variation and differentiation in spiny rats 239 Craniometric differences among subspecies of P albispinus were initially assessed by discriminant function analysis (fig. 4C, D). The first two discriminant functions together account completely for the total among-group variation (DF1 accounting for and DF2 accounting for the remaining ). The projection of individual discriminant scores for the three subspecies samples of P albispinus on the plane defined b
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Variation and differentiation in spiny rats 239 Craniometric differences among subspecies of P albispinus were initially assessed by discriminant function analysis (fig. 4C, D). The first two discriminant functions together account completely for the total among-group variation (DF1 accounting for and DF2 accounting for the remaining ). The projection of individual discriminant scores for the three subspecies samples of P albispinus on the plane defined by DF1 and DF2 reveals two major almost distinct clusters (fig. 4C). One cluster is represented by samples of P. a albispinus from three different localities in Bahia and of P. a sertonius from six localities in Bahia and Sergipe. Individuals of these samples overlap extensively in the multivariate character space, indicating that they are morphometrically very similar. The second cluster represents a single population of P a minor from Morro do Chapéu, characterized by low scores on DF1. However, this axis must also be interpreted as a general size vector because the correlation of all cranial characters with DF1 were all positive and approximately of the same high magnitude (r = —, P<; fig. 4D). Thus, because adults of P albispinus show substantial amounts of variation in cranial size within populations due to indeterminate growth (Pessóa &Reis 1991), the differences albispinus. albispinus 40 42 44 46 48 Greatest Skull Length. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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