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Multi-scale effects of land cover and urbanization on the habitat suitability of an endangered toad

November 14, 2018

Habitat degradation, entwined with land cover change, is a major driver of biodiversity loss. Effects of land cover change on species can be direct (when habitat is converted to alternative land cover types) or indirect (when land outside of the species habitat is altered). Hydrologic and ecological connections between terrestrial and aquatic systems are well understood, exemplifying how spatially disparate land cover conditions may influence aquatic habitats, but are rarely examined. We sought to quantify relative effects of land cover at two different but interacting scales on habitat suitability for the endangered arroyo toad (Anaxyrus californicus). Based on an existing distribution model for the arroyo toad and available land cover data, we estimated effects of land cover along streams and within entire watersheds on habitat suitability using structural equation modeling. Relationships between land cover and habitat suitability differed between scales, and broader, watershed-scale conditions influenced land cover along the embedded stream networks. We found anthropogenic development and forest cover at the watershed-scale negatively impacted habitat suitability, but development along stream networks was positively associated with suitability. The positive association between development along streams and habitat suitability may be attributable to increased spatial heterogeneity along urbanized streams, or related factors including policies designed to conserve riparian habitats amidst development. These findings show arroyo toad habitat is influenced by land cover across multiple scales, and can inform conservation of the species. Furthermore, our methodology can help elucidate similar dynamics with other taxa, particularly those reliant on both terrestrial and aquatic environments.

Publication Year 2018
Title Multi-scale effects of land cover and urbanization on the habitat suitability of an endangered toad
DOI 10.1016/j.biocon.2018.10.032
Authors Michael L. Treglia, Adam C Landon, Robert N. Fisher, Gerard Kyle, Lee A. Fitzgerald
Publication Type Article
Publication Subtype Journal Article
Series Title Biological Conservation
Index ID 70200903
Record Source USGS Publications Warehouse
USGS Organization Western Ecological Research Center