Abstract
Static, ontogenetic, and evolutionary allometry in all five larval instars of nine species of the water strider genera Gerris and Aquarius were compared using a multivariate approach. Common principal component analysis (CPCA), a generalization extending principal component analysis (PCA) to multigroup situations, was carried out on covariance matrices of log-transformed measurements of eight characters of antennae and legs. For all three types of allometry, a good fit of the model of simple multivariate allometry was found, and PCA results were similar in all instars and species, which justifies the use of CPCA to estimate a common pattern of allometric variation for each of the three types of allometry. We found a fairly close association between static and ontogenetic allometry, which indicates at least in part a developmental origin of individual variation. Evolutionary allometry differed markedly from static and ontogenetic allometry, with leg segments displaying strongly positive allometry. We discu...
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