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Link to original content: http://pubmed.ncbi.nlm.nih.gov/24855669/
Avian-style respiration allowed gigantism in pterosaurs - PubMed Skip to main page content
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. 2014 Aug 1;217(Pt 15):2627-8.
doi: 10.1242/jeb.104919. Epub 2014 May 22.

Avian-style respiration allowed gigantism in pterosaurs

Graeme Ruxton  1
Affiliations

Avian-style respiration allowed gigantism in pterosaurs

Graeme Ruxton. J Exp Biol. .

Abstract

Powered flight has evolved three times in the vertebrates: in the birds, the bats and the extinct pterosaurs. The largest bats ever known are at least an order of magnitude smaller than the largest members of the other two groups. Recently, it was argued that different scaling of wingbeat frequencies to body mass in birds and bats can help explain why the largest birds are larger than the largest bats. Here, I extend this argument in two ways. Firstly, I suggest that different respiratory physiologies are key to understanding the restriction on bat maximum size compared with birds. Secondly, I argue that a respiratory physiology similar to birds would have been a prerequisite for the gigantism seen in pterosaurs.

Keywords: Allometry; Bats; Birds; Limits to flight; Scaling.

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