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Science 1 June 2001: Vol. 292. no. 5522, pp. 1707 - 1710 DOI: 10.1126/science.1060102
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Reports
Climate-Driven Range Expansion and Morphological Evolution in a Marine Gastropod
Michael E. Hellberg,1*
Deborah P. Balch,2
Kaustuv Roy2*
Little is known about the phenotypic consequences of global climate
change, despite the excellent Pleistocene fossil record of many taxa.
We used morphological measurements from extant and Pleistocene
populations of a marine gastropod (Acanthinucella spirata)
in conjunction with mitochondrial DNA sequence variation from living
populations to determine how populations responded phenotypically to
Pleistocene climatic changes. Northern populations show little sequence
variation as compared to southern populations, a pattern consistent
with a recent northward range expansion. These recently recolonized
northern populations also contain shell morphologies that are absent in
extant southern populations and throughout the Pleistocene fossil
record. Thus, contrary to traditional expectations that morphological
evolution should occur largely within Pleistocene refugia, our data
show that geographical range shifts in response to climatic change can
lead to significant morphological evolution.
1 Department of Biological Sciences, 508 Life
Sciences Building, Louisiana State University, Baton Rouge, LA 70803, USA.
2 Section of Ecology, Behavior and Evolution,
Division of Biology, University of California, San Diego, 9500 Gilman
Drive, La Jolla, CA 92093-0116, USA.
*
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail:
kroy{at}biomail.ucsd.edu
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