Do watershed conditions or local climate play a larger role in determining regional stream salamander distributions?

Hydrobiologia
USFWS
By: , and 

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Abstract

Anthropogenic influences like land use and climate variability interact with natural heterogeneity to influence the persistence of stream salamanders. Using occupancy modeling in the southern Appalachian Mountains, we investigated the influence of land use, climate, and physical context (e.g., drainage area, elevation) on stream salamander occupancy, noting species, and life stage specific responses. Our results illustrate that forest loss is a better predictor of salamander occupancy than physical context (elevation) or climate. Across the gradients in this dataset, precipitation did not have a significant influence on salamander occupancy, potentially due to the observed narrow, wet gradient. Temperature had little effect on Eurycea wilderae occupancy; however, temperature negatively affected adult but not larval Desmognathus amphileucus occupancy. Spatial thermal variability in this study was larger than projected increases due to climate change, suggesting that local mechanisms (e.g., behavior or physiological plasticity) may facilitate salamander resilience to climate change. However, the negative effects of forest loss coupled with rising temperatures (e.g., increased solar radiation, warmer stream runoff) underscore the importance of riparian forests in mitigating climate stressors. Preserving forest cover is critical for maintaining stream salamander populations and may offer opportunities for maintaining resilience in the face of additional stressors like rising temperatures or drought.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Do watershed conditions or local climate play a larger role in determining regional stream salamander distributions?
Series title Hydrobiologia
DOI 10.1007/s10750-025-05848-8
Volume 852
Publication Date March 28, 2025
Year Published 2025
Language English
Publisher Springer
Contributing office(s) Western Ecological Research Center
Description 15 p.
First page 4053
Last page 4067
Country United States
State Georgia, North Carolina
Other Geospatial Upper Little Tennessee watersheds
Additional publication details