Details:

Journal Title:
Ecology and Evolution
Personal Author:
Grant, Evan H. Campbell ; Brand, Adrianne B. ; De Wekker, Stephan F. J. ; Lee, Temple R. ; Wofford, John E. B.
Grant, Evan H. Campbell ; Brand, Adrianne B. ; De Wekker, Stephan F. J. ; Lee, Temple R. ; Wofford, John E. B. Less -
NOAA Program & Office:
NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies)
NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) Less -
Description:
A frequent assumption in ecology is that biotic interactions are more important than abiotic factors in determining lower elevational range limits (i.e., the “warm edge” of a species distribution). However, for species with narrow environmental tolerances, theory suggests the presence of a strong environmental gradient can lead to persistence, even in the presence of competition. The relative importance of biotic and abiotic factors is rarely considered together, although understanding when one exerts a dominant influence on controlling range limits may be crucial to predicting extinction risk under future climate conditions. We sampled multiple transects spanning the elevational range limit of Plethodon shenandoah and site and climate covariates were recorded. A two‐species conditional occupancy model, accommodating heterogeneity in detection probability, was used to relate variation in occupancy with environmental and habitat conditions. Regional climate data were combined with datalogger observations to estimate the cloud base heights and to project future climate change impacts on cloud elevations across the survey area. By simultaneously accounting for species’ interactions and habitat variables, we find that elevation, not competition, is strongly correlated with the lower elevation range boundary, which had been presumed to be restricted mainly as a result of competitive interactions with a congener. Because the lower elevational range limit is sensitive to climate variables, projected climate change across its high‐elevation habitats will directly affect the species’ distribution. Testing assumptions of factors that set species range limits should use models which accommodate detection biases.
Keywords:
[+]
Ecology
Lungless Salamanders

Source:
Ecology and Evolution (2018) 8(15): 7553-7562.
DOI:
https://doi.org/10.1002/ece3.4198
Document Type:
Journal Article
Place as Subject:
Virginia
Rights Information:
CC BY
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:19c36523a6b60385ed210d37dae4abc16962ebbc49e3a50f4508b8c696de5160
File Type:

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