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DNA hybridization evidence for the Australasian affinity of the American marsupial Dromiciops australis.

Abstract：

:DNA hybridization was used to compare representatives of the major groups of marsupials and a eutherian outgroup. Because of the large genetic distances separating marsupial families, trees were calculated from normalized percentages of hybridization; thermal-melting statistics, however, gave identical topologies for the well-supported clades. The most notable results were the association of the only extant microbiotheriid, Dromiciops australis, an American marsupial, with the Australasian Diprotodontia, and of both together with the Dasyuridae. Estimates of the rate of divergence among marsupial genomes suggest that the Dromiciops-Diprotodontia split occurred approximately 50 million years ago, well after the establishment of the major clades of marsupials but before deep oceanic barriers prohibited dispersal among Australia, Antarctica, and South America. Because Dromiciops is nested within an Australasian group, it seems likely that dispersal from Australia accounts for its present distribution.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Kirsch JA,Dickerman AW,Reig OA,Springer MS

doi

10.1073/pnas.88.23.10465

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

10465-9

issue

23

eissn

0027-8424

issn

1091-6490

journal_volume

88

pub_type

杂志文章

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