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Local differentiation in the defensive morphology of an invasive zooplankton species is not genetically based

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dc.contributor.advisor McAdam, Andrew G.
dc.contributor.advisor Crease, Teresa, J. Fiorino, Giuseppe E. 2016-04-22T18:59:07Z 2016-04-22T18:59:07Z 2016-04 2016-04-20 2016-04-22
dc.description.abstract Invasive species cause widespread ecological and economic damage, but to better understand how exotic species spread to become invasive, empirical studies of the mechanisms driving phenotypic differentiation between populations of invasive species are required. This study determined whether differences in distal spine length among populations of Bythotrephes longimanus in lakes with or without gape-limited fish predators could be explained by local adaptation or phenotypic plasticity. I collected Bythotrephes from six lakes and found that distal spine lengths and natural selection on distal spine length differed among populations, but were unrelated to the gape-limitation of the dominant fish predator. A common garden experiment revealed significant genetic and maternal variation for the trait, but phenotypic differences among populations were not genetically based. Phenotypic differentiation of this ecologically important trait is, therefore, a result of plasticity and not local adaptation, despite spatially variable selection on this heritable trait. en_US
dc.description.sponsorship My work was supported by an Ontario Graduate Scholarship (OGS) and by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada (NSERC) to Andrew McAdam and Teresa Crease. en_US
dc.language.iso en en_US
dc.rights Attribution-NonCommercial-NoDerivs 2.5 Canada *
dc.rights.uri *
dc.subject invasive species en_US
dc.subject Bythotrephes longimanus en_US
dc.subject common garden experiment en_US
dc.subject phenotypic plasticity en_US
dc.subject local adaptation en_US
dc.subject natural selection en_US
dc.subject quantitative genetics en_US
dc.title Local differentiation in the defensive morphology of an invasive zooplankton species is not genetically based en_US
dc.type Thesis en_US Integrative Biology en_US Master of Science en_US Department of Integrative Biology en_US
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Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada