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dc.contributor.authorSoberón, Jorge
dc.contributor.authorMartínez-Gordillo, David
dc.date.accessioned2014-05-19T16:45:47Z
dc.date.available2014-05-19T16:45:47Z
dc.date.issued2012
dc.identifier.citationSoberón, J. and Martínez-Gordillo, D. 2012. Occupation of environmental and morphological space: climatic niche and skull shape in Neotoma woodrats. Evolutionary Ecology Research 14(4): 503-517.
dc.identifier.urihttp://hdl.handle.net/1808/13671
dc.descriptionThis is the publisher's version, which the author has permission to share. The original version may be found online at the following link: http://www.evolutionary-ecology.com/issues/v14/n04/kkar2777.pdf
dc.description.abstractBackground: Theoretical and empirical studies suggest that in some circumstances niche evolution may be very slow – a phenomenon called ‘niche conservatism’. Evidence for niche conservatism comes mainly from studies of niches whose axes are climatic variables with broad ranges of spatial covariance (coarse-grained niche variables). The geographic area inside the physiologically viable climatic extreme values (i.e. climate tolerances) is usually large and may expose populations to a wide range of finer-grained selective pressures. Hypothesis: Coarse-grained niche variables lead to different evolutionary patterns than do finer-grained niche variables. Data: Skulls from museum specimens of rats of the genus Neotoma provided data on lateral, ventral, dorsal, and mandibular aspects. Climate data were assembled for each place where a specimen had been caught. Key assumption: Rats of the genus Neotoma respond to selective pressures that are coarse-grained in space, whereas their cranial dimensions respond to fine-grained selective pressures. The volume of a minimally enclosing ellipsoid in the principal component (PCA) space of either climatic or morphological variables is a surrogate for the species’ breadth of occupation of climatic and morphological spaces. Methods: We measured and analysed overall variance in climatic variables and morphology using geometric morphometry methods. We analysed ellipsoid volumes, together with summaries of skull shape and climatic tolerances, as to the influence of phylogeny on patterns of variation. And we also searched for contrasting patterns of morphological and climatic features. Conclusions: Patterns in climatic and morphological variables were different. Climatic PC axes were mostly uncorrelated with morphological PC axes. Ellipsoid volumes of the climatic variables were significantly smaller than those of the morphological variables. Blomberg’s K did show that the evolution of most of the PC axes (four morphological and three climatic) cannot be distinguished from Brownian motion. However the evolution of two PCs – the PC dominated by dryness and the one dominated by ventral view of the skull – have been restricted by phylogeny.
dc.language.isoen
dc.publisherEvolutionary Ecology
dc.relation.isversionofhttp://www.evolutionary-ecology.com/issues/v14/n04/kkar2777.pdf
dc.subjectfundamental niche
dc.subjectgeometric morphometry
dc.subjectNeotoma
dc.subjectniche conservatism
dc.subjectNorth America
dc.subjectrealized niche
dc.subjectskull
dc.titleOccupation of environmental and morphological space: climatic niche and skull shape in Neotoma woodrats
dc.typeArticle
kusw.kuauthorSoberón, Jorge
kusw.kudepartmentEcology and Evolutionary Biology
kusw.oastatusfullparticipation
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item meets KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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