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Spangler, G. R., C. Stepien, Ongoing. Geographic Variation
and Colonization Patterns of Ruffe, Gymnocephalus cernuus, in
the Great Lakes: Otolith Signatures and DNA Sequence Divergence,
University of Minnesota and Case Western Reserve University,
Minnesota Sea Grant College Program
Geographic Variation
and Colonization Patterns of Ruffe, Gymnocephalus cernuus, in
the Great Lakes: Otolith Signatures and DNA Sequence Divergence
Objectives/Abstract:
To determine the European origins of ruffe, Gymnocephalus cernuus,
within the Great Lakes, and its colonization patterns within the
streams and estuaries of Lake Superior.
Methodology:
Pattern recognition technology will be applied to the first year
growth increments in otoliths from young-of-the-year and adult
ruffe sampled in Thunder Bay, Ontario, Duluth-Superior estuary,
selected streams along the south shore of Lake Superior and future
colonization sites in the Great Lakes. These results will be compared
with genetic stock identification from highly variable regions
of mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) sequences
in order to identify the foci of breeding populations in the lakes
that are the source(s) of colonizing individuals involved in the
current expansion of the range of this exotic species. Trans-Atlantic
sources of founding populations will be determined and the likelihood
of multiple inoculations in North America will be ascertained.
Contact:
G. Spangler, Dept. of Fisheries and Wildlife,
200 Hodson Hall, Univ. Minnesota, St. Paul, 55108 (612) 624-9229
or Home Page or
cas20@po.CWRU.Edu
Keywords: Basic_biology,
Colonization,
Ongoing_project,
Ruffe
Product Type: Basic_biology,
Research
User Type: Resource_management
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