Polymorphism in developmental mode and its effect on population genetic structure of a spionid polychaete, Pygospio elegans

Integrative and Comparative Biology
Jenni E KesäniemiK Emily Knott

Abstract

Population genetic structure of sedentary marine species is expected to be shaped mainly by the dispersal ability of their larvae. Long-lived planktonic larvae can connect populations through migration and gene flow, whereas species with nondispersive benthic or direct-developing larvae are expected to have genetically differentiated populations. Poecilogonous species producing different larval types are ideal when studying the effect of developmental mode on population genetic structure and connectivity. In the spionid polychaete Pygospio elegans, different larval types have been observed between, and sometimes also within, populations. We used microsatellite markers to study population structure of European P. elegans from the Baltic Sea (BS) and North Sea (NS). We found that populations with planktonic larvae had higher genetic diversity than did populations with benthic larvae. However, this pattern may not be related to developmental mode, since in P. elegans, developmental mode may be associated with geography. Benthic larvae were more commonly seen in the brackish BS and planktonic larvae were predominant in the NS, although both larval types also are found from both areas. Significant isolation-by-distance (IBD) was fou...Continue Reading

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Citations

Apr 13, 2012·Integrative and Comparative Biology·K Emily Knott, Damhnait McHugh
Feb 3, 2015·Current Biology : CB·Thomas J Webb, Beth L Mindel
Mar 24, 2016·PloS One·Jenni E KesäniemiK Emily Knott
Sep 5, 2017·Evolution & Development·Liisa K HeikkinenK Emily Knott

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