A large-scale survey of heterochrony in anuran cranial ossification patterns

Weisbecker, Vera and Mitgutsch, Christian (2010) A large-scale survey of heterochrony in anuran cranial ossification patterns. Journal of Zoological Systematics and Evolutionary Research, 48 4: 332-347. doi:10.1111/j.1439-0469.2010.00570.x

Author Weisbecker, Vera
Mitgutsch, Christian
Title A large-scale survey of heterochrony in anuran cranial ossification patterns
Journal name Journal of Zoological Systematics and Evolutionary Research   Check publisher's open access policy
ISSN 0947-5745
Publication date 2010-11
Year available 2010
Sub-type Article (original research)
DOI 10.1111/j.1439-0469.2010.00570.x
Volume 48
Issue 4
Start page 332
End page 347
Total pages 16
Place of publication Berlin, Germany
Publisher Wiley-Blackwell
Language eng
Abstract Most anurans have a biphasic life cycle, which includes metamorphosis from a tadpole stage to an adult frog. This process involves extensive transformations of the cranial skeleton, which have been of long-standing interest with respect to anuran skeletal evolution and taxonomy. In this study, large-scale patterns of anuran skeletal ossification are assessed by collecting the most comprehensive data set on anuran cranial ossification to date from the literature, including data for 45 anuran and one caudate outgroup species. Ossification sequences were translated into event-pair matrices for explorative phylogenetic analysis and phylogenetically informed parsimony search for heterochrony using the Parsimov algorithm. Rank variability of single bones across species was also analysed. Little phylogenetic signal was retrieved from a parsimony-based phylogenetic analysis of event-pairs, and only a few species that are generally agreed to be closely related are placed close to each other (e.g. some Pipidae and Costata). Parsimov analysis revealed some clade-specific heterochrony in anuran clades of varying inclusiveness. Our results show that relating heterochronic changes in anuran cranial ontogeny to parameters such as direct development or miniaturization is problematic because of the high evolvability of cranial ossification sequences. Rank variation analysis suggests that anuran cranial bones are highly variable in their sequence positioning, possibly because tadpole and adult cranial morphology do not co-evolve. Elements which are lost in some species ossify at the end of the sequence, providing evidence for the notion that failure of anuran cranial elements to ossify is due to processes of paedomorphosis.
Keyword Event-pairs
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 08 Apr 2013, 22:35:35 EST by Gail Walter on behalf of School of Biological Sciences