Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Cryptic Barriers to Dispersal within a Lake Allow Genetic Differentiation of Eurasian Perch

S. Bergek and M. Björklund
Evolution
Vol. 61, No. 8 (Aug., 2007), pp. 2035-2041
Stable URL: http://www.jstor.org/stable/4627018
Page Count: 7
  • Read Online (Free)
  • Download ($4.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cryptic Barriers to Dispersal within a Lake Allow Genetic Differentiation of Eurasian Perch
Preview not available

Abstract

Gene flow between coexisting or nearby populations normally prevents genetic divergence and local adaptation. Despite this, there are an increasing number of reports of sympatric sister taxa, indicating potential divergence and speciation in the face of gene flow. A large number of such reported cases involve lake-dwelling fish, which are expected to run into few physical barriers to dispersal within their aquatic habitat. However, such cases may not necessarily reflect sympatric speciation if cryptic dispersal barriers are common in lakes and other aquatic systems. In this study, we examined genetic differentiation in perch (Perca fluviatilis L.) from nine locations in a single, small lake (24 km²), using microsatellites. We detected significant genetic differentiation in all but two pairwise comparisons. These patterns were not consistent with divergence by distance or the existence of kin groups. Instead, they suggest that cryptic barriers to dispersal exist within the lake, allowing small-scale genetic divergence. Such an observation suggests that allopatric (or parapatric) divergence may be possible, even in small, apparently homogenous environments such as lakes. This has important consequences for how we currently view evidence from nature for sympatric speciation.

Page Thumbnails

  • Thumbnail: Page 
2035
    2035
  • Thumbnail: Page 
2036
    2036
  • Thumbnail: Page 
2037
    2037
  • Thumbnail: Page 
2038
    2038
  • Thumbnail: Page 
2039
    2039
  • Thumbnail: Page 
2040
    2040
  • Thumbnail: Page 
2041
    2041