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Integrative study on static skull variation in the J apanese weasel (Carnivora: Mustelidae)
Author(s) -
Suzuki S.,
Abe M.,
Motokawa M.
Publication year - 2012
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.2012.00924.x
Subject(s) - allometry , biology , skull , mustelidae , neurocranium , weasel , trait , variation (astronomy) , range (aeronautics) , zoology , coefficient of variation , standard deviation , anatomy , ecology , statistics , mathematics , predation , materials science , physics , composite material , computer science , astrophysics , programming language
We assessed static skull variation in the J apanese weasel M ustela itatsi by integrating different variation indices. We used the coefficient of variation ( CV ), residuals of the standard deviation regressed onto the mean of each measurement ( R SD ) and allometry coefficients ( AC s). CV showed nonlinear correlation with mean trait size as reported in many previous studies. R SD has a similar pattern of variation to CV and it has been used as an index to obliterate the trait size bias seen in CV . Furthermore, similarly sized traits showed a wide range of CV , with many largely scattered around a nonlinear regression curve. Therefore, variation in CV is not entirely generated by the bias and to some extent reflects real biological phenomena. Allometric analyses revealed that larger specimens tended to have a relatively larger viscerocranium, smaller neurocranium, more robust mandible, larger canines, smaller carnassials, and smaller M1 compared with smaller specimens. These patterns are possibly consistent with general ontogenetic skull shape change in the genus M ustela . Tooth measurements, as well as cranial and mandibular measurements, showed significant correlations with skull size. CV variation is determined mainly by AC and is weakly related to the correlation between trait and skull size.