Uso da técnica de morfometria geométrica em incertezas taxonômicas de espécies do gênero Callinectes Stimpson, 1860
The American continent present approximately 13 species of the genus Callinectes, 6 of these are most commonly found in Northeast of Brazil. This group, commonly known as swimming crabs, has species of difficult taxonomic distinction. The cause of this are methodologies based on observation of gonop...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47293 |
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| Resumo: | The American continent present approximately 13 species of the genus Callinectes, 6 of these are most commonly found in Northeast of Brazil. This group, commonly known as swimming crabs, has species of difficult taxonomic distinction. The cause of this are methodologies based on observation of gonopods, gonopores, and dorsal characters of the carapace. Its juvenile phase is not included in identification keys, which aggravates it because it has similar morphology, coloration, and ecology. Geometrical morphometry is an alternative for identification of minimal morphological variations in body structures by having greater discriminating power. Therefore, this work sought to use the technique of geometrical morphometry to quantify the lowest intraspecific morphological distance, instead of interspecific distance, in juveniles of species of the genus Callinectes, thus, propose the use of adult taxonomic identification key for the juvenile ontogenetic classes. For this, specimens of species C. bocourti, C. danae, C. exasperatus, C. marginatus, C. ornatus and C. sapidus were collected and identified using specialized bibliography. The abstraction of the shape of the carapace was performed using photographs for marking 35 landmarks. Then, the Canonical Variable Analysis produced a morpho-space of the main patterns of form variation between the ontogenetic trajectories of juveniles and adults, and the Discrimination Function Analysis tested the interspecific variation among species juveniles. These were performed using 1000 permutations and the comparisons were based on the distance of Procrustes and correct assent of the cross-variation matrix. Lastly, the juveniles of the species were the most morphologically similar to adults of their specie. Thereby, we observe the possibility of extending the diagnosis used in adults for the juveniles of the species. This similarity of interspecific landmarks demonstrated morphological relationship between C. danae with C. marginatus, and vice-versa, C. ornatus with C. danae, C. sapidus with C. marginatus, and C. bocourti with C. sapidus, being reflex similar selective pressures in the habitats through ecological overlap in sympatric species and/or molecular proximity. |
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