[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Global Palaeobiogeographical Model for the Late Mesozoic



From: Ben Creisler
bcreisler@gmail.com

A paper now officially published and apparently not yet mentioned on the DML:

Martín D. Ezcurra and Federico L. Agnolín (2012)
A New Global Palaeobiogeographical Model for the Late Mesozoic and
Early Tertiary.
Systematic Biology 61 (4): 553-566
doi: 10.1093/sysbio/syr115
http://sysbio.oxfordjournals.org/content/61/4/553.abstract

Abstract

Late Mesozoic palaeobiogeography has been characterized by a
distinction between the northern territories of Laurasia and the
southern landmasses of Gondwana. The repeated discovery of Gondwanan
lineages in Laurasia has led to the proposal of alternative scenarios
to explain these anomalous occurrences. A new biogeographical model
for late Mesozoic terrestrial ecosystems is here proposed in which
Europe and “Gondwanan” territories possessed a common Eurogondwanan
fauna during the earliest Cretaceous. Subsequently, following the
Hauterivian, the European territories severed from Africa and then
connected to Asiamerica resulting in a faunal interchange. This model
explains the presence of Gondwanan taxa in Laurasia and the absence of
Laurasian forms in the southern territories during the Cretaceous. In
order to test this new palaeobiogeographical model, tree
reconciliation analyses (TRAs) were performed based on biogeographical
signals provided by a supertree of late Mesozoic archosaurs. The TRAs
found significant evidence for the presence of an earliest Cretaceous
Eurogondwanan fauna followed by a relatively short-term
Gondwana–Laurasia dichotomy. The analysis recovered evidence for a
biogeographical reconnection of the European territories with Africa
and South America–Antarctica during the Campanian to Maastrichtian
time-slice. This biogeographical scenario appears to continue through
the early Tertiary and sheds light on the trans-Atlantic disjunct
distributions of several extant plant and animal groups.

The cover image is related to the article and shows a phorusrhacoid bird

http://sysbio.oxfordjournals.org/content/61/4.cover-expansion