Original Paper

Biological Invasions

, Volume 11, Issue 6, pp 1393-1401

First online:

Dominance of an invasive earthworm in native and non-native grassland ecosystems

  • Yaniria Sánchez-de LeónAffiliated withDepartment of Plant, Soil and Entomological Sciences, University of IdahoDepartment of Biological Sciences (M/C 066), University of Illinois at Chicago Email author 
  • , Jodi Johnson-MaynardAffiliated withDepartment of Plant, Soil and Entomological Sciences, University of Idaho

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More attention is currently being focused on earthworm invasions; however, in many ecosystems the relative abundance of native and invasive earthworm species is unknown. We characterized earthworm populations of two grassland types within the Palouse region: native prairie remnants and Conservation Reserve Program (CRP) set asides planted with exotic grasses. The earthworm community in both grassland types was completely dominated by the exotic-invasive Aporrectodea trapezoides. Only one individual of a native species, Driloleirus americanus (the giant Palouse earthworm), was found in a prairie remnant. No differences were found between prairie remnants and CRP sites for mean earthworm density (24–106 individuals m−2) or fresh weight (12–45 g m−2). Our results suggest that the combined effects of land-use change, habitat fragmentation and competitive interactions have resulted in the decimation of native earthworm populations and dominance of invasive earthworms in native and non-native grasslands of the Palouse region.


Invasive earthworms Grasslands Palouse prairie Conservation Reserve Program