06-Otter-Chap06.qxd 25/9/06 9:45 AM Page 77 CHAPTER 6 Phylogeography of chestnut-backed chickadees in western North America
North American chickadees and titmice are believed to be descendents of Eurasian lineages that crossed the Bering land bridge in the late Pliocene 3.5 to 4 million years ago (Gill et al. 2005;
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Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.324.292 http://classes.uleth.ca/200701/biol4500a/burg2.pdf |
Summary: | North American chickadees and titmice are believed to be descendents of Eurasian lineages that crossed the Bering land bridge in the late Pliocene 3.5 to 4 million years ago (Gill et al. 2005; |
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