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Biological Invasions

, Volume 17, Issue 12, pp 3591–3607 | Cite as

Broad and local-scale patterns of exotic earthworm functional groups in forests of National Wildlife Refuges of the Upper Midwest, USA

  • Lindsey M. ShartellEmail author
  • R. Gregory CoraceIII
  • Andrew J. Storer
  • Daniel M. Kashian
Original Paper

Abstract

The National Wildlife Refuge System is the world’s largest network of lands set aside specifically for wildlife conservation. For refuge planners and managers tasked with maintaining ecological integrity and wildlife habitat, many uncertainties exist. In forests in the Upper Midwest, for instance, exotic earthworms are impacting ecosystem structure and function, but their community composition and effects on refuges is unknown. We examined the association of earthworm functional group abundance and community composition within upland forests of refuges with broad scale patterns of anthropogenic land use and local scale differences in forest characteristics. Patterns of anthropogenic land cover, including proportion of the land, mean patch area, and largest patch index, were strongly correlated with the biomass of epi-endogeic earthworms. Earthworm community diversity, however, was inversely related to patterns of dominating anthropogenic land cover, and increased under high ratios of natural to anthropogenic lands in the surrounding ecoregion. Within forests, earthworm community composition could be partially explained by variables representing both dispersal opportunities and habitat suitability. In general, heavily-invaded forests had low conifer dominance, high silt content, high basal area, greater amounts of anthropogenic cover within 500 m, and were closer to roads and farther from agriculture. However, the relationship between local forest characteristics and biomass differed greatly among earthworm functional groups and between refuges dominated by natural lands and those dominated by anthropogenic lands. For refuges with high earthworm loads and well developed earthworm communities, managers may be confounded in restoring historic conditions and may need to look at multiple tools, including artificial regeneration, to mitigate for current earthworm effects. In refuges seemingly in earlier stages of earthworm invasion, future planning and management should be tempered by potential effects observed in those refuges in more anthropogenic landscapes.

Keywords

Invasive species Great Lakes Region Anthropogenic land cover Forest management 

Notes

Acknowledgments

Funding was provided by the U.S. Fish and Wildlife Service Midwest Region, the refuges of study, Seney Natural History Association, Michigan Technological University, and Wayne State University. Forest structure and composition data were provided by Holly Petrillo, University of Wisconsin-Steven’s Point. The authors appreciate the support of colleagues in the NWRS, particularly Patricia Heglund (Regional Biologist), Mark Vaniman and Laurie Tansy (Seney NWR), Ron Huffman (Ottawa NWR), Michelle Vander Haar (Shiawassee NWR), Michelle McDowell (Rice Lake NWR), Wayne Brininger (Tamarac NWR), and Wendy Woyczik (Horicon NWR). We would also like to thank those who assisted: Ashlee Baker, Alina Neel, Dakota Hunter, Joe May, Max Henschell, Adam Komar, John Otterbein, Erin Marchand, and other NWRS staff and volunteers. The authors thank the anonymous reviewer for their helpful comments and suggestions that improved this manuscript. The findings and conclusions in this article are those of the authors and do not necessarily represent the views of the U.S. Fish and Wildlife Service.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Lindsey M. Shartell
    • 1
    • 4
    Email author
  • R. Gregory CoraceIII
    • 2
  • Andrew J. Storer
    • 1
  • Daniel M. Kashian
    • 3
  1. 1.School of Forest Resources and Environmental ScienceMichigan Technological UniversityHoughtonUSA
  2. 2.Seney National Wildlife RefugeU.S. Fish and Wildlife ServiceSeneyUSA
  3. 3.Department of Biological SciencesWayne State UniversityDetroitUSA
  4. 4.Division of Fish and WildlifeMinnesota Department of Natural ResourcesGrand RapidsUSA

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