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Re: Ankylosaurian paleoenvironmental associations from extirpation, sea-level fluctuation, and geodispersal (free pdf)



The pdf is now available for free download at the link.

On Tue, Feb 23, 2016 at 11:46 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> A new paper:
>
> Victoria M. Arbour, Lindsay E. Zanno & Terry Gates (2016)
> Ankylosaurian dinosaur palaeoenvironmental associations were
> influenced by extirpation, sea-level fluctuation, and geodispersal.
> Palaeogeography, Palaeoclimatology, Palaeoecology (advance onlinen 
> publication)
> doi:10.1016/j.palaeo.2016.02.033
> http: // www.sciencedirect.com/science/article/pii/S0031018216001073
>
>
> Highlights
>
> Ankylosaur remains are unevenly distributed in marine and terrestrial
> environments.
> Only in North America and Asia is this distribution statistically significant.
> In North America, this distribution is only significant in the
> Albian-Cenomanian.
>
> Abstract
>
> More species of nodosaurid ankylosaurians than ankylosaurid
> ankylosaurians have been found in marine sediments, and some previous
> quantitative studies of global dinosaur occurrences provide support
> for an association between nodosaurids and marine depositional
> environments. We compiled a dataset of global ankylosaurian
> occurrences and found that the geographic distribution of marine
> ankylosaurian occurrences is regionally biased with 54% of records
> stemming from western North America in the Cretaceous—a time of
> regional highstands in sea level and epicontinental flooding, coupled
> with differential extirpation of ankylosaurian subclades inhabiting
> the Western Interior Basin (WIB). Within the Western Interior Basin,
> we found little statistical support for an association between
> ankylosaurian subclades and palaeoenvironment in a chronological
> context. Only the Albian-Cenomanian transgressive-regressive cycle had
> statistical support for an overabundance of nodosaurids in marine
> environments compared to ankylosaurids. The apparent overabundance of
> nodosaurids relative to ankylosaurids in marine sediments in the
> Western Interior Basin overall cannot be decoupled from the
> extirpation of North American ankylosaurids during the Cenomanian and
> the subsequent absence of ankylosaurids in North America during the
> Turonian to early Campanian prior to the immigration of Asian
> ankylosaurine ankylosaurids. The North American ankylosaurian record
> highlights the difficulty in interpreting habitat preferences in the
> context of a shifting seaway, regional extinctions, and
> intercontinental dispersals.