Shape distances, shape spaces and the comparison of morphometric methods

Monteiro, Leandro R.; Bordin, Benjamin; Reis, Sérgio Furtado dos

doi:10.1016/s0169-5347(99)01775-9

Cited by 39 publications

(23 citation statements)

References 16 publications

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“…The aligned coordinates were also used to calculate geometric shape distances (Procrustes chord distances - Rohlf, 1999) between population mean shapes. The Procrustes metric is the base of the shape space used by geometric morphometric methods (Rohlf, 1999;Monteiro et al, 2000) and is defined as the summed squared distances between corresponding points in two configurations, after the least-squares superimposition. These distances serve as an overall measure of shape differentiation.…”

Section: Geometric Shape Variablesmentioning

confidence: 99%

Morphological divergence rate tests for natural selection: uncertainty of parameter estimation and robustness of results

Monteiro

Gomes‐Jr

2005

Genet. Mol. Biol.

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In this study, we used a combination of geometric morphometric and evolutionary genetics methods for the inference of possible mechanisms of evolutionary divergence. A sensitivity analysis for the constant-heritability rate test results regarding variation in genetic and demographic parameters was performed, in order to assess the relative influence of uncertainty of parameter estimation on the robustness of test results. As an application, we present a study on body shape variation among populations of the poeciliine fish Poecilia vivipara inhabiting lagoons of the quaternary plains in northern Rio de Janeiro State, Brazil. The sensitivity analysis showed that, in general, the most important parameters are heritability, effective population size and number of generations since divergence. For this specific example, using a conservatively wide range of parameters, the neutral model of genetic drift could not be accepted as a sole cause for the observed magnitude of morphological divergence among populations. A mechanism of directional selection is suggested as the main cause of variation among populations in different habitats and lagoons. The implications of parameter estimation and biological assumptions and consequences are discussed.

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Section: Geometric Shape Variablesmentioning

confidence: 99%

Morphological divergence rate tests for natural selection: uncertainty of parameter estimation and robustness of results

Monteiro

Gomes‐Jr

2005

Genet. Mol. Biol.

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“…Monteiro et al, 2000;Adams et al, 2004). In insects in general (Baylac and Daufresne, 1996;Baylac and Penin, 1998;Klingenberg et al, 2001;Baylac et al, 2003) or in honeybees in particular, geometric morphometric analyses of wing shape have provided many new insights, either into the characterization and identification of populations or lineages Tofilski, 2008), the Africanization process of American populations (Francoy et al, 2008(Francoy et al, , 2009, or even into the more demanding analyses of heritability (Monteiro et al, 2002) or individual wing asymmetry (Smith et al, 1997;Klingenberg et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Both geometric morphometric and microsatellite data consistently support the differentiation of the Apis mellifera M evolutionary branch

Miguel¹,

Baylac²,

Iriondo³

et al. 2011

Apidologie

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-Traditional morphometrics, allozymes, and mitochondrial data have supported a close relationship between the M branch subspecies A. m. iberiensis and the North African subspecies (A branch). However, studies using nuclear DNA markers have revealed a clear distinction between the latter and the two European M branch subspecies. In help resolve this paradox, we analyzed 663 colonies from six European and African subspecies. A geometric morphometrics approach was applied to the analysis of wing shape, and the results were compared with data of six microsatellite loci. Both data sets were found to be highly consistent and corroborated a marked divergence of West European subspecies from North African ones. This supports the hypothesis that the presence of the African lineage mitotype in Iberian honey bee populations is likely the consequence of secondary introductions, with a minimal African influence within the current Iberian genetic background. Wing geometric morphometrics appears more appropriate than mitochondrial DNA analysis or traditional morphometrics in the screening and identification of the Africanization process.honeybee / evolutionary branch / wing morphology / geometric morphometrics / microsatellite

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“…The shape of molluscan shells has also been characterized, in more traditional approaches, by the use of simpler measurements, such as the ratio of width to height (for a review, see Goodfriend,1986), or by the plotting of these two measurements in order to create a 'size/shape space' (Cain, 1981;Cameron and Cook, 1989). Multivariate morphometrics have also been extensively used to separate size and shape components of the shell but, following the major paper of Rohlf and Marcus (1993) on morphometric methodology, there is now a clear tendency to record sufficient data in order to allow the recreation of the structure being studied (Stone, 1998;Monteiro et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Shell shape of the land snail Cornu aspersum in North Africa: unexpected evidence of a phylogeographical splitting

Mathieu

Bellido²,

Guiller³

2003

Heredity

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Anatomical and molecular characters used to differentiate populations of the land snail Cornu aspersum (Helix aspersa) exhibit, in the western Mediterranean, definite and concordant patterns of correlation with geography. Scenarios involving Pliocene geological changes and postglacial expansion during the Pleistocene were proposed in previous studies to account for the establishment of this geographical structure. In the present work, we have performed a spatial analysis of variation in shell morphometrics, after the partitioning of the overall variation into size and shape components by means of a principal component-based approach (Cadima and Jolliffe, 1996). In order to know if the same historical events have also structured shell variation, the analysis includes all the populations from North Africa which were investigated for anatomical and molecular surveys. Contrary to shell size, which shows a significant spatial heterogeneity essentially related to environmental pressures, variation in shell shape components splits the populations according to a geographical pattern reflective of hypotheses suggested for molecular markers and genital anatomy. This implies that the selective forces often invoked to explain spatial changes in shell shape are not the deciding factors in the present case. Moreover, within each of the two geographical clusters defined, Mantel correlograms show that the similarity between populations declines according to an isolation by distance model. Because of the different allometric relationships between shell size and genitalia measurements in Western and Eastern entities of North Africa, mechanical constraints, possibly leading to a precopulatory isolation in the contact zone, are involved.

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Shape distances, shape spaces and the comparison of morphometric methods

Cited by 39 publications

References 16 publications

Morphological divergence rate tests for natural selection: uncertainty of parameter estimation and robustness of results

Morphological divergence rate tests for natural selection: uncertainty of parameter estimation and robustness of results

Both geometric morphometric and microsatellite data consistently support the differentiation of the Apis mellifera M evolutionary branch

Shell shape of the land snail Cornu aspersum in North Africa: unexpected evidence of a phylogeographical splitting

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