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Caracterização morfológica dos otólitos sagitta das espécies portuguesas da família Triglidae

Authors: Vieites, Ana Maria Domingues, 1983-;

Caracterização morfológica dos otólitos sagitta das espécies portuguesas da família Triglidae

Abstract

Desde há várias décadas, vários autores têm usado as características morfológicas dos otólitos sagitta dos peixes para inferir relações de proximidade ou distanciamento filogenético entre taxa, confirmando ou propondo alterações, mais ou menos drásticas, às classificações vigentes. O presente trabalho tem como alvo as espécies Nordeste Atlânticas da família Triglidae, cuja sistemática tem estado envolta numa certa controvérsia. Com este estudo pretende-se verificar se a caracterização e descrição morfológica detalhada dos otólitos sagitta das espécies em causa fornecem suporte para corroborar alguma das classificações existentes ou apresentar uma alternativa. Com este objectivo em vista, efectua-se uma caracterização e descrição detalhadas dos otólitos sagitta das oito espécies portuguesas da família Triglidae (Chelidonichthys cuculus, Chelidonichthys lucernus, Chelidonichthys obscurus, Eutrigla gurnardus, Lepidotrigla cavillone, Lepitotrigla dieuzeidei, Trigla lyra e Trigloporus lastoviza) com o intuito de determinar a extensão da variabilidade intraespecífica e se a mesma permite a identificação segura das espécies com base na caracterização morfológica dos seus otólitos. O teste de Qui-quadrado permitiu a identificação imediata de algumas características diagnosticantes das espécies C. lucernus, E. gurnardus, L. cavillone e T. lyra e uma Análise de Correspondências Múltiplas (ACM) permitiu determinar as combinações de características que diagnosticam as restantes quatro espécies em estudo. Do estudo realizado conclui-se, através de um caso prático, que a morfologia dos otólitos é uma ferramenta muito útil na identificação de indivíduos até à espécie e na inferência de relações filogenéticas entre eles.

Since several decades ago, many authors have used the morphological characteristics of the otoliths sagitta of fish to infer proximity or phylogenetic relationships between taxa, confirming or proposing more or less drastic changes in the current classifications. This work targets the Northeast Atlantic species of the family Triglidae, which have been systematically involved in some controversy. This study intends to verify if the characterization and detailed morphological description of the otoliths sagitta of the species concerned provides support to corroborate some of the existing classifications or to propose an alternative arrangement for the species of the family. With this in mind, a detailed description and characterization of the sagitta otoliths of the eight Portuguese species of the Triglidae family (Chelidonichthys cuculus, Chelidonichthys lucernus, Chelidonichthys obscurus, Eutrigla gurnardus, Lepidotrigla cavillone, Lepitotrigla dieuzeidei, Trigla lyra and Trigloporus lastoviza) is made, in order to determine the extent of intraspecific variability and if it allows a reliable identification of species based on the morphological characterization of their otoliths. The Chi-square test immediately allowed the identification of some diagnostic features of the species C. lucernus, E. gurnardus, L. cavillone and T. lyra and a Multiple Correspondence Analysis (MCA) test allowed the determination of characteristic combinations that diagnose the remaining four species under study. In general it can be concluded that the morphology of otoliths is a useful tool in the identification of individuals down to species and in the inference of phylogenetic relations among them.

Tese de mestrado. Biologia (Ecologia Marinha). Universidade de Lisboa, Faculdade de Ciências, 2013

Country
Portugal
Related Organizations
Keywords

Otólitos, Morfologia, Ictiologia, Teses de mestrado, 2013

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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