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Parallel clines in morphologic and genetic differentiation in a coastal zone marine invertebrate: the bryozoan Schizoporella errata

Published online by Cambridge University Press:  08 April 2016

Thomas J. M. Schopf  and
Alan R. Dutton
Thomas J. M. Schopf
Affiliation:
Schopf. Department of the Geophysical Sciences, University of Chicago; Chicago, Illinois 60637; and Marine Biological Laboratory, Woods Hole, Massachusetts 02543
Alan R. Dutton
Affiliation:
Department of the Geophysical Sciences, University of Chicago; Chicago, Illinois 60637.
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Abstract

Genetic and morphologic differentiation in the bryozoan Schizoporella errata parallel each other over a distance of 102 km along the southern shore of Cape Cod. This is seen in the allele frequencies of two marker genes and in the length of the avicularium (a type of defensive polymorph of the bryozoan colony). These changes appear to be part of the continuing evolutionary adaptation to local environmental conditions, perhaps characteristic of marine species whose dispersal ability is very limited. The length scale of significant changes in allele frequencies at the two loci is as low as 10–11 km, and for avicularium length is 13 km.

Type
Research Article
Information
Paleobiology , Volume 2 , Issue 3 , Summer 1976 , pp. 255 - 264
Copyright
Copyright © The Paleontological Society 

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