scholarly journals Geometric morphometrics for the study of hemicoxae sexual dimorphism in a local domestic equine breed

2014 ◽  
Vol 31 (04) ◽  
pp. 214-218 ◽  
Author(s):  
P. Parés-Casanova
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Reliable Method ◽  
Sex Differentiation ◽  
Horse Breed ◽  
Geometric Morphometric ◽  
Photographic Images ◽  
Average Accuracy ◽  
Pelvic Shape ◽  
Shape And Size

Abstract Introduction and material and methods. Twenty-height skeletonised hemicoxae from young animals (yearlings, 13 males and 15 females) belonging to the “CavallPirinencCatalà” horse (Catalan Pyrenean Horse) breed were studied by means of geometric morphometric (GM) methods. Morphometric analysis was based on coordinates of 16 landmarks of the ilium and ischiopubic regions that were digitised on 2D photographic images. Sexes did not appear separated either by size or shape, the latter being independent of the former.K-means clustering of shape variables were used in order to classify individuals by sex and an average accuracy of 57.1% was achieved. Results. Males were misclassified more frequently than females. For the iliac landmarks, which contributed to the total variance of shape with the higher degree, the value obtained increased to 60.7% for k-means. The ischiopubic complex contributed less to sex differentiation according to shape. Conclusion. It is concluded that the use of GM and multivariate statistics is not a reliable method to quantify pelvic shape and size differences between the sexes for equine yearlings. This is the irst known study to apply GM to the hip of an equine breed.

scholarly journals Application of Three Dimensional Geometric Morphometric Analysis for Sexual Dimorphism of Human Skull: A Systematic Review

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Abdelnasser Ibrahim ◽  
Aspalilah Alias ◽  
Mohamed Swarhib Shafie ◽  
Faridah Mohd Nor
Keyword(s):  
Systematic Review ◽  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Meta Analysis ◽  
Positive Contribution ◽  
Inclusion Criteria ◽  
Geometric Morphometric ◽  
Human Skull ◽  
Geometric Morphometric Analysis

The present systematic review explores the most sexually dimorphic parameters by using geometric morphometric analysis of human skull. An extended search was conducted in Google Scholars and PubMed (published between 2005 and 2017). The main inclusion criteria were research articles published in English, and studies that used geometric morphometric analysis for classification of human skull. The literature search identified 54 potential relevant articles whereby, five had met the inclusion criteria. Most studies reported positive contribution of geometric morphometric as an alternative and accurate tool for classification of unknown human crania. Geometric morphometric method resulted in a high classification accuracy of sexual dimorphism among different populations. Further studies are required to approach the best method used for varied types of postcranial bones equipped with a more advanced meta-analysis of the results.

scholarly journals On two species of Riocypris (Crustacea, Ostracoda) from northern Patagonia and their relation to Eucypris fontana: implications in paleoenvironmental reconstructions

2018 ◽  
Vol 96 (8) ◽  
pp. 801-817 ◽  
Author(s):  
C.A. Coviaga ◽  
A.P. Pérez ◽  
L.Y. Ramos ◽  
P. Alvear ◽  
G.C. Cusminsky
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Indicator Species ◽  
Taxonomic Status ◽  
Geometric Morphometric ◽  
Comparative Analyses ◽  
Northern Patagonia ◽  
Geometric Morphometric Analysis ◽  
The Individual ◽  
First Time

Two species of ostracods new to Patagonia, Argentina, are described. One of them, Riocypris whatleyi sp. nov., is described for the first time, and the second, Riocypris sarsi (Daday, 1902) comb. nov., is reallocated from genus Eucypris to genus Riocypris. Inter- and intra-specific variations in shape, size, and sexual dimorphism were evaluated based on geometric morphometric analysis. Moreover, morphological and morphometric comparative analyses were applied to re-examine living and quaternary specimens recovered from previous studies. Based on these results, a generic reassignment for the Patagonian Eucypris fontana (Jurine, 1820) into the genus Riocypris is proposed. Contributing to the knowledge on the systematic and autecology of this enigmatic species, widely distributed in Patagonia and frequently used in paleolimnological reconstructions, generates science-based evidence for their use as indicator species. Additionally, our results emphasize the usefulness of studying the living representatives (i.e., with valves and appendages) for elucidating the taxonomic status of the individual specimens, especially those present in paleontological records and used as bioproxies in paleolimnological studies.

Geometric morphometric analysis reveals sexual dimorphism in the distal femur

2016 ◽  
Vol 259 ◽  
pp. 246.e1-246.e5 ◽  
Author(s):  
Etienne Cavaignac ◽  
Frederic Savall ◽  
Marie Faruch ◽  
Nicolas Reina ◽  
Philippe Chiron ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Distal Femur ◽  
Geometric Morphometric ◽  
Geometric Morphometric Analysis

Sexual dimorphism of the maxillary postcanine dentition: A geometric morphometric analysis

HOMO ◽  
2020 ◽  
Vol 71 (4) ◽  
pp. 259-271 ◽  
Author(s):  
Sandra López-Lázaro ◽  
Inmaculada Alemán ◽  
Joan Viciano ◽  
Javier Irurita ◽  
Miguel C. Botella
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Geometric Morphometric ◽  
Geometric Morphometric Analysis

No functional sexual dimorphism in Minorcan horse assessed by geometric morphometric methods

2015 ◽  
Vol 56 ◽  
pp. 91-95 ◽  
Author(s):  
Pere M. Parés-Casanova ◽  
C. Allés
Keyword(s):  
Sexual Dimorphism ◽  
Lateral View ◽  
Geometric Morphometric ◽  
Male And Female ◽  
Size And Shape ◽  
Morphometric Methods ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea ◽  
Age Range ◽  
Shape And Size

SummaryThe existence of sexual dimorphism in the Minorcan horse, an autochthonous breed from Minorca Island in the Balearic archipelago (NW Mediterranean Sea), is established in the official standard, with females being shorter and longer than males as well as having slenderer necks and a squarer croup. However, no study so far has explored the size and shape components of this dimorphism separately. The aim of this study was to analyse the morphology of this breed using geometric morphometric methods in order to find size and shape differences between sire lines. The analysis was based on landmarks digitized in lateral view from 38 registered adult Minorcan horses (20 males and 18 females) within an age range of 3–14 years (average 7 years) with different performance goals. The analyses did not reveal any significant differences between the “shape” and “size” of male and female animals, for the landmarks studied, so the sexes are functionally similar.

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