Biological Invasions

, Volume 16, Issue 4, pp 859–873

Ash (Fraxinus spp.) mortality, regeneration, and seed bank dynamics in mixed hardwood forests following invasion by emerald ash borer (Agrilus planipennis)

Authors

    • Department of Horticulture and Crop Science, Ohio Agricultural Research and Development CenterThe Ohio State University
  • Daniel A. Herms
    • Department of Entomology, Ohio Agricultural Research and Development CenterThe Ohio State University
  • Kathleen S. Knight
    • Forestry Sciences Laboratory, Northern Research StationUSDA Forest Service
  • Catherine P. Herms
    • Department of Horticulture and Crop Science, Ohio Agricultural Research and Development CenterThe Ohio State University
  • Deborah G. McCullough
    • Departments of Entomology and ForestryMichigan State University
  • Annemarie Smith
    • Department of Entomology, Ohio Agricultural Research and Development CenterThe Ohio State University
  • Kamal J. K. Gandhi
    • Department of Entomology, Ohio Agricultural Research and Development CenterThe Ohio State University
    • Daniel B. Warnell School of Forestry and Natural ResourcesThe University of Georgia
  • John Cardina
    • Department of Horticulture and Crop Science, Ohio Agricultural Research and Development CenterThe Ohio State University
Original Paper

DOI: 10.1007/s10530-013-0543-7

Cite this article as:
Klooster, W.S., Herms, D.A., Knight, K.S. et al. Biol Invasions (2014) 16: 859. doi:10.1007/s10530-013-0543-7

Abstract

Emerald ash borer (EAB; Agrilus planipennis) has killed millions of ash trees and threatens ash throughout North America, and long-term persistence of ash will depend on the potential for regeneration. We quantified ash demography, including mortality and regeneration, of Fraxinus americana (white ash), Fraxinus pennsylvanica (green ash), and Fraxinus nigra (black ash) in mixed hardwood forests near the epicenter of the EAB invasion in southeastern Michigan and throughout Ohio. Plots were established across a gradient of ash densities. Ash was the most important species in hydric sites, and ranked second among all species in mesic and xeric sites. In sites nearest the epicenter in Michigan, ash mortality exceeded 99 % by 2009, and few or no newly germinated ash seedlings were observed, leaving only an “orphaned cohort” of established ash seedlings and saplings. As ash mortality increased, the number of viable ash seeds in soil samples decreased sharply, and no viable seeds were collected in 2007 or 2008. In Ohio sites farther from the epicenter, densities of new ash seedlings were much higher in plots with healthy ash trees compared to plots where trees had died. EAB was still present in low densities in Michigan and Ohio stands in 2012 where average mortality of ash was nearly 100 %. The future of ash at these sites will depend on the outcome of the dynamic interaction between the orphaned cohort of previously established ash seedlings and saplings and low density EAB populations.

Keywords

Ash regenerationDemographyInvasive forest pestSeedlings

Copyright information

© Springer Science+Business Media Dordrecht 2013