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Allometric change accompanies opercular shape evolution in Alaskan threespine sticklebacks
 

Summary: Allometric change accompanies opercular shape
evolution in Alaskan threespine sticklebacks
Charles B. Kimmel1,4)
, Windsor E. Aguirre2)
, Bonnie Ullmann1)
,
Mark Currey3)
& William A. Cresko3)
(1 Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA; 2 Department
of Ecology and Evolution, State University of New York, Stony Brook, NY 11794, USA;
3 Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403,
USA)
(Accepted: 27 December 2007)
Summary
How does development evolve to produce a skeletal element with a new shape? We extend
our previous study of morphological evolution and development of the opercle, a large facial
bone with favorable attributes for both comparative and development analyses. The opercle
becomes prominently reshaped when Alaskan anadromous stickleback fish evolve into res-
ident freshwater lacustrine forms. We use geometric morphometrics to examine the opercle
shape change which includes a prominent dilation of the bone along one axis, coupled with

  

Source: Aguirre, Windsor E. - Department of Ecology and Evolution, SUNY at Stony Brook

 

Collections: Biology and Medicine