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Re: Dinosaur and pterosaur head crest evolution by sexual selection
PDF rec'd.
Lee Hall
Paleontologist
SWCA Environmental Consultants
http://sites.google.com/site/leehallpaleo/Home
paleeoguy@gmail.com
On Mon, Dec 19, 2011 at 9:54 AM, Ben Creisler <bscreisler@yahoo.com> wrote:
> From: Ben Creisler
> bscreisler@yahoo.com
>
> A new online paper:
>
>
> DAVID W.E. HONE, DARREN NAISH & INNES C. CUTHILL (2011 [2012])
> Does mutual sexual selection explain the evolution of head crests in
> pterosaurs and dinosaurs?
> Lethaia (advance online publication)
> DOI: 10.1111/j.1502-3931.2011.00300.x
> http://onlinelibrary.wiley.com/doi/10.1111/j.1502-3931.2011.00300.x/abstract
> Cranial ornamentation is widespread throughout the extinct non-avialian
> Ornithodira, being present throughout Pterosauria, Ornithischia and
> Saurischia. Ornaments take many forms, and can be composed of at least a
> dozen different skull bones, indicating multiple origins. Many of these
> crests serve no clear survival function and it has been suggested that their
> primary use was for species recognition or sexual display. The distribution
> within Ornithodira and the form and position of these crests suggest sexual
> selection as a key factor, although the role of the latter has often been
> rejected on the grounds of an apparent lack of sexual dimorphism in many
> species. Surprisingly, the phenomenon of mutual sexual selection -- where
> both males and females are ornamented and both select mates -- has been
> ignored in research on fossil ornithodirans, despite a rich history of
> research and frequent expression in modern birds. Here, we review the
> available evidence
> for the functions of ornithodiran cranial crests and conclude that mutual
> sexual selection presents a valid hypothesis for their presence and
> distribution. The integration of mutual sexual selection into future studies
> is critical to our understanding of ornithodiran ecology, evolution and
> particularly questions regarding sexual dimorphism.