Performance of pairwise shape dissimilarity morphometrics on non-mammalian taxa (Insecta : Neuroptera : Mantispidae)

dc.contributor.authorBakkes, D.K. (Deon)
dc.contributor.authorSnyman, Louwtjie P.
dc.contributor.authorPirk, Christian Walter Werner
dc.contributor.authorSole, Catherine L.
dc.contributor.emailclsole@zoology.up.ac.zaen_ZA
dc.date.accessioned2016-08-04T08:27:44Z
dc.date.issued2015-12
dc.description.abstractMorphometric dissimilarity metrics aim to quantify the variation between compared specimens such that inferences about their relatedness and alpha taxonomy can be made. Recently, the technique has developed metrics that purport to quantify shape dissimilarity between specimens—employing the use of least squares regression analysis. These metrics have been well applied by studies in the hominin fossil record with an arguably unsubstantiated backing for the technique. Originally postulated was the log10 sem metric which subsequently led to the standard error test of the null hypothesis metric. Following this, the standard deviation of logged ratios (SLR) metric arose as a pairwise dissimilarity metric that constrains the regression to a zero-intercept, that is, a significant development in the robustness of the technique. This metric was tested on extant primates in order to evaluate its effectiveness alongside the two other metrics. It was shown to be the most reliable for comparisons between specimens of primates, but was unable to discriminate between heterospecific and conspecific comparisons. Arguably, an alternative model organism with which to compare the technique is lacking. This study considers shape dissimilarity metrics with respect to a group of nonmammalian organisms (mantidflies) and tests the metrics against three lines of evidence (morphology, CO1-DNA, and geographic distribution) that can delimit the species-level taxonomy for the group. It is shown that the metrics are unable to discriminate between pairwise comparisons of closely related species, resulting in biologically erroneous groupings, and contradicting the groupings derived from morphological, CO1-DNA, and distributional comparisons. It is thus asserted that the technique is unsuitable for use in alpha taxonomy as an additional line of evidence in mantidflies. It is further supposed that morphometrics in general should be employed with caution in studies of evolutionary history as phylogeny is not the only information contained within morphometric data.en_ZA
dc.description.departmentZoology and Entomologyen_ZA
dc.description.embargo2016-12-31
dc.description.librarianhb2016en_ZA
dc.description.sponsorshipNational Research Foundation (NRF)en_ZA
dc.description.urihttp://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4687en_ZA
dc.identifier.citationBakkes, DK, Snyman, LP, Pirk, CWW & Sole, CL 2015, 'Performance of pairwise shape dissimilarity morphometrics on non-mammalian taxa (Insecta : Neuroptera : Mantispidae)', Journal of Morphology, vol. 276, no. 12, pp. 1482-1494.en_ZA
dc.identifier.issn0362-2525 (print)
dc.identifier.issn1097-4687 (online)
dc.identifier.other10.1002/jmor.20436
dc.identifier.urihttp://hdl.handle.net/2263/56184
dc.language.isoenen_ZA
dc.publisherWileyen_ZA
dc.rights© 2015 Wiley Periodicals Inc. This is the pre-peer reviewed version of the following article : Performance of pairwise shape dissimilarity morphometrics on non-mammalian taxa (Insecta : Neuroptera : Mantispidae in Journal of Morphology, vol. 276, no. 12, pp. 1482-1494, 2015. doi : 10.1002/jmor.20436. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1002/(ISSN)1097-4687.en_ZA
dc.subjectLog semen_ZA
dc.subjectStandard error test of the null hypothesisen_ZA
dc.subjectMantispiden_ZA
dc.subjectStandard deviation of logged ratios (SLR)en_ZA
dc.subjectDeoxyribonucleic acid (DNA)en_ZA
dc.subjectCO1-DNAen_ZA
dc.titlePerformance of pairwise shape dissimilarity morphometrics on non-mammalian taxa (Insecta : Neuroptera : Mantispidae)en_ZA
dc.typePostprint Articleen_ZA

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