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Biological Invasions

, Volume 20, Issue 7, pp 1671–1685 | Cite as

Tracking an invasion: community changes in hardwood forests following the arrival of Amynthas agrestis and Amynthas tokioensis in Wisconsin

  • Katherine M. LaushmanEmail author
  • Sara C. Hotchkiss
  • Bradley M. Herrick
Original Paper

Abstract

Because Upper Midwest temperate forests lack native earthworms, the invasions of European and Asian earthworms can significantly alter soils and understory vegetation. Earthworms’ ability to increase leaf litter decay, alter nutrient cycling by mixing the organic layer with mineral soil, and decrease plant species richness leads to concern about the Asian ‘jumping earthworm’ (Amynthas agrestis and A. tokioensis) species that were recorded in the University of Wisconsin—Madison Arboretum in 2013. In 2015, we found A. agrestis and A. tokioensis in a distinct 8-ha region of a 23-ha hardwood forest surveyed in the Arboretum; by 2016 A. agrestis and A. tokioensis had spread over an additional 7 ha. Plots also contained the European earthworm species Lumbricus terrestris, L. rubellus, and Apporectodea spp., whose distributions decreased from 2015 to 2016. While leaf litter, plant species richness, and tree and shrub seedling abundance were generally reduced in areas with European earthworms, they were typically slightly increased in areas with A. agrestis and A. tokioensis versus those without. Although our results do not show substantial impacts of A. agrestis and A. tokioensis on vegetation in the initial years of invasion, the rapid replacement of European earthworms by A. agrestis and A. tokioensis suggests continued monitoring of these new invasive species is important to better understand their potential to change the Upper Midwest’s forests.

Keywords

Megascolecidae Lumbricidae Amynthas agrestis Amynthas tokioensis Asian jumping worm Biological invasion Wisconsin 

Notes

Acknowledgements

We thank the staff of the University of Wisconsin—Madison Arboretum for assistance with this research, and Jiangxiao Qiu and Carly Ziter for assistance with research design and collaboration. We thank Nicholas Keuler for statistical expertise and guidance, Mark Wegener for GIS support and map-making, and Will Vincent for figure drafting. We also thank Bernadette Williams, of the Wisconsin Department of Natural Resources, for sharing her knowledge of earthworm history and research in the area, and two anonymous reviewers for their helpful feedback.

Supplementary material

10530_2017_1653_MOESM1_ESM.docx (2.4 mb)
Supplementary material 1 (DOCX 2444 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2017

Authors and Affiliations

  • Katherine M. Laushman
    • 1
    Email author
  • Sara C. Hotchkiss
    • 2
  • Bradley M. Herrick
    • 3
  1. 1.Nelson Institute for Environmental StudiesUniversity of Wisconsin – MadisonMadisonUSA
  2. 2.Botany DepartmentUniversity of Wisconsin – MadisonMadisonUSA
  3. 3.University of Wisconsin – Madison ArboretumMadisonUSA

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