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Genetic diversity and differentiation in populations of invasive Eurasian (Myriophyllum spicatum) and hybrid (Myriophyllum spicatum × Myriophyllum sibiricum) watermilfoil

Published online by Cambridge University Press:  17 April 2020

Ryan A. Thum Open the ORCID record for Ryan A. Thum [Opens in a new window] ,
Gregory M. Chorak ,
Raymond M. Newman ,
Jasmine A. Eltawely ,
Jo Latimore ,
Erick Elgin  and
Syndell Parks
Ryan A. Thum*
Affiliation:
Assistant Professor, Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT, USA
Gregory M. Chorak
Affiliation:
Ph.D Student, Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT, USA
Raymond M. Newman
Affiliation:
Professor, Fisheries, Wildlife, and Conservation Biology, University of Minnesota, St Paul, MN, USA
Jasmine A. Eltawely
Affiliation:
Graduate Student, Water Resources Science, University of Minnesota, St Paul, MN, USA
Jo Latimore
Affiliation:
Senior Academic Specialist, Michigan State University, East Lansing, MI, USA
Erick Elgin
Affiliation:
Water Resources Educator, Michigan State University Extension, East Lansing, MI, USA
Syndell Parks
Affiliation:
Research Technician, Grand Valley State University Robert B. Annis Water Resources Institute, Muskegon, MI, USA
*
Author for correspondence: Ryan A. Thum, Department of Plant Sciences and Plant Pathology, Montana State University, 313 Plant BioSciences Building, Bozeman, MT59717. (Email: ryan.thum@montana.edu)
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Abstract

Population genetic studies of within- and among-population genetic variability are still lacking for managed submerged aquatic plant species, and such studies could provide important information for managers. For example, the extent of within-population genetic variation may influence the potential for managed populations to locally adapt to environmental conditions and control tactics. Similarly, among-population variation may influence whether specific control tactics work equally effectively in different locations. In the case of invasive Eurasian watermilfoil (Myriophyllum spicatum L.), including interspecific hybrids with native northern watermilfoil (Myriophyllum sibiricum Kom.), managers recognize that there is genetic variation for growth and herbicide response. However, it is unclear how much overall genetic variation there is, and how it is structured within and among populations. Here, we studied patterns of within- and among-lake genetic variation in 41 lakes in Michigan and 62 lakes in Minnesota using microsatellite markers. We found that within-lake genetic diversity was generally low, and among-lake genetic diversity was relatively high. However, some lakes were genetically diverse, and some genotypes were shared across multiple lakes. For genetically diverse lakes, managers should explicitly recognize the potential for genotypes to differ in control response and should account for this in monitoring and efficacy evaluation and using pretreatment herbicide screens to predict efficacy. Similarly, managers should consider differences in genetic composition among lakes as a source of variation in the growth and herbicide response of lakes with similar control tactics. Finally, laboratory or field information on control efficacy from one lake may be applied to other lakes where genotypes are shared among lakes.

Keywords

AMOVAfluridoneherbicide resistanceinvasive speciespopulation genetics
Type
Research Article
Information
Invasive Plant Science and Management , Volume 13 , Issue 2 , June 2020 , pp. 59 - 67
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Marie Jasieniuk, University of California, Davis

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