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Early embryogenesis in discoglossoid frogs: a study of heterochrony at different taxonomic levels


Mitgutsch, C; Olsson, L; Haas, A (2009). Early embryogenesis in discoglossoid frogs: a study of heterochrony at different taxonomic levels. Journal of zoological systematics and evolutionary research, 47(3):248-257.

Abstract

We studied the timing of the early development of the cranial neural crest, neural tube differentiation, somite formation and body elongation in the closely related frog species Discoglossus montalenti, Discoglossus galganoi, Discoglossus pictus, Bombina orientalis, Bombina variegata and Bombina maxima. Despite their different egg and embryo sizes, event pairing shows that there are only very few heterochronies among the three Bombina species and the three Discoglossus species in early developmental events. Instead, differences become apparent at the genus level (interpreted as phylogenetic signal). For example, the separation into a mandibular and a hyoid portion of cranial neural crest could be seen earlier in the Discoglossus than in the Bombina species when compared with the development of the neural tube. The development of the cranial neural crest streams also shifts (relatively) forward in time when compared with body elongation and somite formation in the Discoglossus species in contrast to the Bombina species. Comparisons with other species show that attempts to correlate heterochronies in early development with life history changes should take into account the possibility of a rather high evolvability, i.e. a high probability of convergence in the timing of these early events

Abstract

We studied the timing of the early development of the cranial neural crest, neural tube differentiation, somite formation and body elongation in the closely related frog species Discoglossus montalenti, Discoglossus galganoi, Discoglossus pictus, Bombina orientalis, Bombina variegata and Bombina maxima. Despite their different egg and embryo sizes, event pairing shows that there are only very few heterochronies among the three Bombina species and the three Discoglossus species in early developmental events. Instead, differences become apparent at the genus level (interpreted as phylogenetic signal). For example, the separation into a mandibular and a hyoid portion of cranial neural crest could be seen earlier in the Discoglossus than in the Bombina species when compared with the development of the neural tube. The development of the cranial neural crest streams also shifts (relatively) forward in time when compared with body elongation and somite formation in the Discoglossus species in contrast to the Bombina species. Comparisons with other species show that attempts to correlate heterochronies in early development with life history changes should take into account the possibility of a rather high evolvability, i.e. a high probability of convergence in the timing of these early events

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Language:English
Date:17 February 2009
Deposited On:13 Jul 2009 09:57
Last Modified:06 Dec 2017 20:10
Publisher:Wiley-Blackwell
ISSN:0947-5745
Publisher DOI:https://doi.org/10.1111/j.1439-0469.2008.00502.x

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