Morphometric comparison of the mandibular region in species of Chirostoma (Atheriniformes: Atherinopsidae) from Lake Pátzcuaro, Michoacán, Mexico

Authors

  • Miriam Soria-Barreto Departamento de Ingeniería en Sistemas Ambientales, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional. Carpio y Plan de Ayala s/n, Col. Plutarco Elías Calles, 11340 México, D. F., México. Dirección actual: El Colegio de la Frontera Sur. Carretera Panamericana y Periférico Sur s/n. 29290 San Cristóbal de Las Casas, Chiapas, México. Correo
  • Joel Paulo-Maya Laboratorio de Ictiología y Limnología, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional. Carpio y Plan de Ayala s/n, Col. Plutarco Elías Calles, 11340 México, D. F., México

Keywords:

Chirostoma, Pátzcuaro, Morphometry, Mandibular apparatus.

Abstract

The genus Chirostoma is a group of fishes endemic to the Mesa Central of Mexico, whose diversification is explained both by processes of allopatric speciation in lotic environments, and by intralacustrine diversification through sympatric speciation. Trying to corroborate the second hypothesis for species of Chirostoma from Lake Pátzcuaro, we evaluated morphometric differences of 11 bones in the mandibular region of C. attenuatum, C. grandocule, C. estor, and C. patzcuaro. In order to identify taxa, we carried out a cluster analysis applying euclidian distances, as well as a principal component analysis on the variance-covariance matrix. The results of the cluster analysis show four groups corresponding to each species, C. grandocule and C. patzcuaro being most similar between themselves and C. attenuatum the most different from the rest. Principal component analysis confirmed the separation of these species, defined by the angle formed by the jaws, the height of the dentary and the length of the post-articulate apophysis. These bones are related to the capture of food. Thus, the species of Chirostoma show clear morphological differentiation in the bony pieces of the mandibular region, a pattern that supports the hypothesis of trophic segregation that allows the coexistence of species in Lake Pátzcuaro.

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Published

2017-01-17

How to Cite

Soria-Barreto, M., & Paulo-Maya, J. (2017). Morphometric comparison of the mandibular region in species of Chirostoma (Atheriniformes: Atherinopsidae) from Lake Pátzcuaro, Michoacán, Mexico. HIDROBIOLÓGICA, 15(2), 161–168. Retrieved from https://hidrobiologica.izt.uam.mx/index.php/revHidro/article/view/1061