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| Registros recuperados: 30 | |
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| Vidal Maldonado,Marcela. A. |
| Most animal groups have sexual dimorphism in morphological characters, especially body size. In many cases, sexual dimorphism may be a consequence of a hierarchical social organization within populations. However, polygyny or monogamy may evolve independently of sexual dimorphism. Two Liolaemus species are known to be good model species to study the relationship between sexual dimorphism and sexual social system: Liolaemus tenuis (polygyny) and Liolaemus copiapoensis (monogamy). In this study, I evaluate the morphological variation in the geometric shape of the orbit between sexes in the two species, comparing their social condition (polygyny, monogamy) and applying a geometric morphometrical methodology. The results show morphological differentiation in... |
| Tipo: Journal article |
Palavras-chave: Geometric morphometrics; Liolaemus copiapoensis; Liolaemus tenuis; Social behavior. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200004 |
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| Kacar,Dundar; Cakmak,Fethiye; Dogan,Ash; Sevinc,Ozdemir; Barut,Cagatay. |
| A fold of tissue, the lingual frenulum, extends onto the inferior surface of the tongue from near the base of the tongue on midline. The shape, length and alignment of lingual frenulum vary between individuals. The aim of this study is to evaluate morphology of lingual frenulum with respect to gender. Ninety seven volunteers who were students and employees of Zonguldak Karaelmas University, School of Medicine participated in the study. Two individuals with a history of hepatitis and 20 individuals with inadequate photographs were excluded from the study. Morphometric analyses were performed on the photographs of 75 volunteers (36 men, 39 women). Lingual frenulum photograph of each individual was taken using standard photographic techniques. The individual... |
| Tipo: Journal article |
Palavras-chave: Lingual frenulum; Geometric morphometrics; Men; Women; Reference points. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200001 |
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| Urbanová,Petra; Hejna,Petr; Zátopková,Lenka; Safr,Miroslav. |
| Morphological variation is a result of interplay among multiple intervening factors. For hyoid bones, the shape and size differences have been scarcely covered in the literature and in majority limited to studies of sexual dimorphism or age dependency. To our knowledge, the human hyoid bone, in complete opposite to other cranial bones, has not been fully utilized to address development questions in terms of asymmetry or modularity. In the present paper, we used landmark-based methods of geometric morphometrics and multivariate statistical approach to study human hyoid morphology represented by the hyoid body and greater horns in a sample of 211 fused and non-fused bones. Within a sample variation analysis, we showed that the hyoid bone is, by nature,... |
| Tipo: Journal article |
Palavras-chave: Hyoid bone; Asymmetry; Modularity; Geometric morphometrics. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100042 |
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| Bocxlaer, B. Van; Strong, E.E.. |
| The anatomy, functional morphology and evolutionary ecology of the Viviparidae, and the subfamily Bellamyinae in particular, are incompletely known. Partly as a result, genealogical relationships within the family remain poorly understood. Because of this lack in knowledge, few informed hypotheses exist on ancestral states, how differences in body plans between the subfamilies evolved, and how the peculiar biogeographic distribution patterns of viviparids have arisen. Here we document the anatomy, morphology, life history and systematics of Cipangopaludina japonica, a Japanese species that has been introduced into North America, to resolve taxonomic confusion and to improve our understanding of how form and function are related in bellamyines. Anatomical... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Basal Architaenioglossa; Bellamya; Fecundity; Geometric morphometrics; Histology; Reproductive anatomy; Sexual dimorphism; 42.73. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/609995 |
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| Potkamp, G.; Vermeij, M.J.A.; Hoeksema, B.W.. |
| Snails of the genus Coralliophila (Muricidae: Coralliophilinae) are common corallivores in the Caribbean, feeding on a wide range of host species. In the present study, the morphological and genetic variation in C. galea and C. caribaea were studied in relation to their association with host coral species at Curaçao. Differences in shell shape among snails living on different hosts were quantified using geometric morphometric and phylogenetic relationships were studied using two mitochondrial markers (12S and COI). Based on these analyses, a new species, C. curacaoensis sp. nov., was found in association with the scleractinian coral Madracis auretenra. Both C. galea and C. caribaea showed host-specific differences in shell shape, size, and shell allometry... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Genetic differentiation; Phylogenetics; 12S; COI; Corallivory; Morphology; Geometric morphometrics; Host race. |
| Ano: 2017 |
URL: http://www.repository.naturalis.nl/record/630190 |
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| Klenovšek, T.; Jojić, V.. |
| We explored modularity and morphological integration of the ventral cranium during postnatal ontogeny in Martino’s vole (Dinaromys bogdanovi). Two closely related phylogenetic groups, originating from the Central and Southeastern part of the species range in the western Balkans, were considered. As expected, both phylogroups had similar patterns of ontogenetic changes in cranial size and shape variation, modularity and integration. At the level of within individual variation, the hypothesis that the viscerocranial and neurocranial regions are separate modules was rejected, indicating that the hypothesized modules are not developmental, but rather functional. At the level of among individual variation, the viscerocranium and the neurocranium could not be... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Allometry; Fluctuating asymmetry; Geometric morphometrics; Neurocranium; Ontogeny; Ventrviscerocranium; Viscerocranium. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/613890 |
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| Ivanović, A.; Aljančič, G.; Artzen, J.W.. |
| We performed an exploratory analysis of the morphology of the cranium in the white olm (Proteus anguinus anguinus) and the black olm (P. a. parkelj) with micro-CT scanning and geometric morphometrics. The mudpuppy (Necturus maculosus) was used as an outgroup. The black olm falls outside the white olm morphospace by a markedly wider skull, shorter vomers which are positioned further apart and by laterally positioned squamosals and quadrates relative to the palate (the shape of the buccal cavity). On account of its robust skull with more developed premaxillae a shorter otico-occipital region, the black olm is positioned closer to Necturus than are the studied specimens of the white olm. The elongated skull of the white olm, with an anteriorly positioned jaw... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cranial skeleton; Geometric morphometrics; Proteidae; Troglomorphism; 42.82. |
| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/475330 |
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| Baracchi, D.; Dapporto, L.; Turillazzi, S.. |
| The phylogeny of the Stenogastrinae wasps is still under discussion and their systematic incomplete. In the present work we used geometric morphometrics, a technique based on a rigorous statistical assessment of shape, to compare the forewings of fifteen species of Stenogastrinae wasps belonging to four different genera to ascertain whether this approach may be used as a reliable method in the study of the taxonomy of the group. The results show that the wing vein junctions can be diagnostic for both genus and species identification. For the first time in this subfamily, we propose a phylogenetic classification of the species based on wing morphology that largely agrees with the cladistic data available at genus level and reflects the differences among... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Geometric morphometrics; Hymenoptera; Nest architecture; Taxonomy; Vespidae; 42.75. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/390403 |
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| Francuski, Lj.; Vujic, A.; Kovacevic, A.; Ludoski, J.; Milankov, V.. |
| The present study investigates phenotypic differentiation patterns among four species of the Cheilosia variabilis group (Diptera, Syrphidae) using a landmark-based geometric morphometric approach. Herein, wing geometric morphometrics established species boundaries that confirm C. melanopa and C. redi stat. nov. as evolutionarily independent entities or separate species within the previously described C. melanopa species. Seventeen samples of C. lasiopa, C. variabilis, C. melanopa and C. redi from 11 localities on the Balkan Peninsula were analysed. Based on wing shape and size, both species boundaries and intraspecific divergent units were delineated indicating the possible presence of evolutionarily independent units within the analysed taxa. Significant... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cheilosia variabilis group; Geometric morphometrics; Intraspecific divergent units; Species delimitation; Wing shape; Wing size; 42.75. |
| Ano: 2009 |
URL: http://www.repository.naturalis.nl/record/320197 |
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| Siliprandi,Carolina C.; Tuset,Víctor M.; Lombarte,Antoni; Farré,Marc; Rossi-Wongtschowski,Carmen L. D. B.. |
| ABSTRACT Morphological characters of species are essential for assessing the functional structure of a fish assemblage, since differences between them, for example in body shape, are related to many functional and ecological traits (e.g., swimming, search for food, striking and capturing prey, evading predators, spawning). Globally, tidal flats are relevant to fish assemblages by offering feeding, refuge, and reproduction grounds. To analyze the morphofunctional structure of the fish assemblage from a tidal flat on the Brazilian coast, we conducted standardized sampling using nine different fishing gears. The geometric morphometric method was applied to describe the fish shapes and verify the morphological structure of the assemblage. Here, we present the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ichthyofauna; Geometric morphometrics; Morphological diversity; Multiple fishing gears; Morphological redundance. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100203 |
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| Avigliano,Esteban; Fortunato,Roberta Callicó; Biolé,Fernanda; Domanico,Alejandro; Simone,Silvia De; Neiff,Juan J.; Volpedo,Alejandra V.. |
| ABSTRACT The streaked prochilod Prochilodus lineatus (Valenciennes) is a commercially freshwater species from South America, distributed in the Plata basin. In the present work the morphometry (circularity, rectangularity, form factor, OL/OW and ellipticity indices) and chemistry (Sr:Ca, Ba:Ca, Zn:Ca) of lapilli otolith, and geometric morphometry of scales of streaked prochilod juveniles, in two sites in the Plata basin (Uruguay River and Estrella Wetland), were compared to determine if they are area-specific and to identify possible breeding areas. Otolith Ba:Ca ratios was 0.017±0.003 mmol/mol for Uruguay River while for Estrella Wetland individuals was bellow the detection limits. Zn:Ca ratios tended to be higher for the latter (0.03±0.002 mmol/mol).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Connectivity; Geocrochemistry; Geometric morphometrics; Plata Basin; Streaked prochilod. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300207 |
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| Registros recuperados: 30 | |
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