Results 21 to 30 of about 1,074,895 (298)

Effects of environmental perturbations during postnatal development on the phenotypic integration of the skull [PDF]

open access: yes, 2011
Integration and modularity are fundamental determinants of how natural selection effects evolutionary change in complex multivariate traits. Interest in the study of the specific developmental basis of integration through experimental approaches is ...
Gonzalez, Paula Natalia   +2 more
core   +2 more sources

Differentiation of Trichuris species using a morphometric approach [PDF]

open access: yes, 2019
Trichuris trichiura is a nematode considered as the whipworm present in humans and primates. The systematics of the genus Trichuris is complex. Morphological studies of Trichuris isolated from primates and humans conclude that the species infecting these
Callejón Fernández, Rocío   +6 more
core   +1 more source

Effects of freezing on white perch Morone americana (Gmelin, 1789): implications for multivariate morphometrics

open access: yes, 2016
Summary This study tested the hypothesis that duration of freezing differentially affects whole-body morphometrics of a derived teleost. Whole-body morphometrics are frequently analyzed to test hypotheses of different species, or stocks within a ...
P. Kočovský
semanticscholar   +1 more source

Wings of Coenagrion puella vary in shape at the northern range margin (Odonata: Coenagrionidae) [PDF]

open access: yes, 2008
A previous study has shown that wing size in Coenagrion puella varied considerably along a latitudinal gradient in the UK. Using landmark data from wing images, patterns of shape variation were also determined along the same transect by geometric ...
Harvey, IF, Hassall, C, Thompson, DJ
core   +1 more source

Brazilian species of Gadila (Mollusca: Scaphopoda: Gadilidae): rediscovery of Gadila elongata comb. nov. and shell morphometrics

open access: yesZoologia (Curitiba), 2010
Gadila elongata comb. nov. was described in 1920 from the northern Gulf of Mexico. Until recently, it was only known from the type locality. Herein we present the first record of G.
Carlos H. S. Caetano   +2 more
doaj   +1 more source

An examination of morphometric variations in a neotropical toad population (Proceratophrys cristiceps, Amphibia, Anura, Cycloramphidae). [PDF]

open access: yesPLoS ONE, 2008
The species Proceratophrys cristiceps belongs to the genus Proceratophrys within the family Cycloramphidae. These amphibians are found exclusively in South America in the morphoclimatic domain of the semi-arid depression zones in northeastern Brazil ...
Kleber S Vieira   +3 more
doaj   +1 more source

Left atrial trajectory impairment in hypertrophic cardiomyopathy disclosed by geometric morphometrics and parallel transport [PDF]

open access: yes, 2016
The analysis of full Left Atrium (LA) deformation and whole LA deformational trajectory in time has been poorly investigated and, to the best of our knowledge, seldom discussed in patients with Hypertrophic Cardiomyopathy.
Chialastri, C   +13 more
core   +1 more source

A revised taxonomy of Asia snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny [PDF]

open access: yesZooKeys, 2020
The Asian snail-eating snakes Pareas is the largest genus of the family Pareidae (formerly Pareatidae), and widely distributed in Southeast Asia. However, potential diversity remains poorly explored due to their highly conserved morphology and incomplete
Ping Wang   +7 more
doaj   +3 more sources

Determination of a novel size proxy in comparative morphometrics

open access: yesSouth African Journal of Science, 2015
Absolute size is a critical determinant of organismal biology, yet there exists no real consensus as to what particular metric of ‘size’ is empirically valid in assessments of extinct mammalian taxa.
Andrew Gallagher
doaj   +1 more source

Do cladistic and morphometric data capture common patterns of morphological disparity? [PDF]

open access: yes, 2015
The distinctly non-random diversity of organismal form manifests itself in discrete clusters of taxa that share a common body plan. As a result, analyses of disparity require a scalable comparative framework.
Adams   +40 more
core   +5 more sources

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