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Re: Gastornis roamed Arctic in the Eocene (free pdf)



Sorry... I keep forgetting to separate the urls.

For the record,

News:

http: // 
www.colorado.edu/news/releases/2016/02/12/giant-flightless-bird-wandered-arctic-50-million-years-ago

http: // phys.org/news/2016-02-giant-flightless-bird-arctic-million.html

On Fri, Feb 12, 2016 at 10:28 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> A new paper in open access that may be of interest:
>
>
> Thomas A. Stidham & Jaelyn J. Eberle (2016)
> The palaeobiology of high latitude birds from the early Eocene
> greenhouse of Ellesmere Island, Arctic Canada.
> Scientific Reports 6, Article number: 20912 (2016)
> doi:10.1038/srep20912
> http: // www.nature.com/articles/srep20912
>
>
> Fossils attributable to the extinct waterfowl clade Presbyornithidae
> and the large flightless Gastornithidae from the early Eocene (~52–53
> Ma) of Ellesmere Island, in northernmost Canada are the oldest
> Cenozoic avian fossils from the Arctic. Except for its slightly larger
> size, the Arctic presbyornithid humerus is not distinguishable from
> fossils of Presbyornis pervetus from the western United States, and
> the Gastornis phalanx is within the known size range of mid-latitude
> individuals. The occurrence of Presbyornis above the Arctic Circle in
> the Eocene could be the result of annual migration like that of its
> living duck and geese relatives, or it may have been a year-round
> resident similar to some Eocene mammals on Ellesmere and some extant
> species of sea ducks. Gastornis, along with some of the mammalian and
> reptilian members of the Eocene Arctic fauna, likely over-wintered in
> the Arctic. Despite the milder (above freezing) Eocene climate on
> Ellesmere Island, prolonged periods of darkness occurred during the
> winter. Presence of these extinct birds at both mid and high latitudes
> on the northern continents provides evidence that future increases in
> climatic warming (closer to Eocene levels) could lead to the
> establishment of new migratory or resident populations within the
> Arctic Circle.
>
>
>
> News:
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__phys.org_news_2016-2D02-2Dgiant-2Dflightless-2Dbird-2Darctic-2Dmillion.html&d=CwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=Y_jUfpqwd4jfeXeUvSXhzUSp0dYfVUy2cqFjFhQyOeE&s=Ug4WNySpDDy1o2fqO27PSHkemGrQfmGGjKbEp7OCjso&e=
>