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Journal of Iberian Geology

, Volume 45, Issue 2, pp 341–351 | Cite as

Morphological integration and evolution of the skull roof in temnospondyl amphibians

  • Celeste M. Pérez-BenEmail author
  • Raúl O. Gómez
Research Paper

Abstract

Morphological integration refers to the phenotypic interdependence of two or more traits and is estimated by the degree of covariation or correlation among traits at different levels, such as at the intraspecific and evolutionary scales. Intraspecific integration of morphological traits results from the interaction among traits at the genetic, developmental, and functional levels and it has been proposed that it channels morphological evolution by modulating variability. In this work, we test whether the intraspecific integration might have channeled the morphological evolution of the skull roof in a major tetrapod radiation, that of extinct temnospondyl amphibians. To do this, we quantified the patterns of intraspecific integration of different species and explored their relationships with the evolutionary patterns of integration and disparity of three clades of temnospondyls using geometric morphometrics. We recovered that, at the intraspecific level, the integration patterns of the total shape of the skull roof are conserved across the clade and over geological time, but that the integration among individual bones varies in every species considered. We did not find a correlation between the patterns of integration among individual bones at the intraspecific and evolutionary levels, nor between the strength of intraspecific integration of each bone and their respective disparity. These results suggest that the intraspecific integration might have not affected significantly the morphological evolution of the skull roof in temnospondyls over geological time. Thus, it seems that the morphological evolution of this skeletal part might have been driven more by selective pressures than by shared developmental constraints inherited from the temnospondyl ancestor.

Keywords

Morphological integration Disparity Morphological evolution Temnospondyli 

Resumen

La integración morfológica refiere a la interdependencia fenotípica de dos o más rasgos y es estimada por el grado de covariación o correlación de dichos rasgos a diferentes niveles, como el intraespecífico y el evolutivo. La integración intraespecífica de rasgos morfológicos resulta de la interacción de caracteres a nivel genético, del desarrollo y funcional y ha sido propuesta como canalizadora de la evolución morfológica al modular la variabilidad. En este trabajo, ponemos a prueba si la integración intraespecífica pudo haber canalizado la evolución morfológica del techo craneano en una de las grandes radiaciones de tetrápodos, la de los anfibios temnospóndilos extintos. Para ello, cuantificamos los patrones de integración intraespecífica de diferentes especies y exploramos su relación con los patrones evolutivos de integración y disparidad en tres clados de temnospóndilos usando morfometría geométrica. Obtuvimos que, a nivel intraespecífico, los patrones de integración de la forma total del techo craneano son conservados dentro del clado y a través del tiempo geológico, pero que la integración entre huesos individuales varía en todas las especies consideradas. No encontramos una correlación entre los patrones de integración entre los huesos individuales a nivel intraespecífico y evolutivo, ni entre la magnitud de la integración intraespecífica de cada hueso y su respectiva disparidad. Estos resultados sugieren que la integración intraespecífica pudo no haber afectado de manera significativa la evolución morfológica del techo craneano de los temnospóndilos a través del tiempo geológico. Por lo tanto, la evolución morfológica de esta parte del esqueleto habría sido dirigida en mayor medida por presiones selectivas que por restricciones del desarrollo heredadas del ancestro temnospóndilo.

Palabras clave

Integración morfológica disparidad evolución morfológica Temnospondyli 

Notes

Acknowledgements

The authors thank U. Göhlich (NHMW), H. Hagdorn (MHI), H. Lutz (NHMM), M. A. Norell (AMNH), K. Padian (UCMP), S. E. Pierce (MCZ), O. W. M. Rauhut (BSM), D. Vasilyan (GPIT), and F. Witzmann (MB) for specimen access. C. P.-B. also thanks R. Schoch and A. M. Báez for fruitful discussions and J. Fortuny, G. Cassini, and M. Ramírez for helpful comments on the doctoral thesis on which this work is based. The article was greatly improved by suggestions of J. Fortuny and two anonymous reviewers. This work was funded by doctoral fellowships from CONICET, DAAD together with the Ministry of Education of Argentina, and the Konrad Lorenz Institute awarded to C.P.-B.

Supplementary material

41513_2018_88_MOESM1_ESM.pdf (309 kb)
Supplementary material 1 (PDF 309 kb)

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.CONICET, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos Aires, Ciudad Universitaria-Pabellón IIBuenos AiresArgentina
  2. 2.Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos Aires, Ciudad Universitaria-Pabellón IIBuenos AiresArgentina

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