Data from: Predictive mapping to identify refuges for plant communities threatened by earthworm invasion

We developed species distribution models (SDMs) using in-situ field surveys and remotely sensed data to (1) identify factors limiting the occurrence of non-native Lumbricus earthworms in imperiled coastal Douglas-fir (Pseudotsuga menziesii) forest and Garry oak (Quercus garryana) and maritime meadow ecosystems endemic to glacial refugia of the Pacific Northwest of North America to (2) evaluate their influence on plant species diversity and identify abiotic factors capable of preventing their dispersal or persistence at a site. 3.

As predicted, shallow, drier soils, and steeper terrain limited earthworm occurrence and abundance in our highly heterogeneous study area, and earthworm presence appeared to reduce plant species richness. Our results indicated that HCVCs endemic to shallow-soil (<12 ± 3 cm) sites that experience regular summer drought appear to act as refuges from invasion by non-native earthworms. Our results also elevate concerns for the conservation of deep-soil habitats not isolated from earthworm invasions by shallow soil, saltwater, or other barriers to earthworm dispersal. 4.

The SDMs developed here offer guidance to the identification of potential refuges for the conservation of imperiled native species and communities from the detrimental effects non-native earthworms in glacial refugia of western North America, and should thereby facilitate proactive planning by conservation practitioners.

Methods

Data was collected via satellite aquisition and field surveys. Detailed methods can be found in the manuscript.

Usage notes

Data was originally analysized using R. v3.5.1.