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Morphological adaptations for digging and climate-impacted soil properties define pocket gopher (Thomomys spp.)
Ariel E Marcy1, Scott Fendorf, James L Patton
1Department of Biology, Stanford University, Stanford, California, United States of America. aemarcy@gmail.com
Plos One
|May 30, 2013
Summary
Pocket gophers (Thomomys spp.) distribution is linked to soil properties, especially clay content and moisture. Climate change impacts soil hardness, affecting gopher habitats and future species ranges.
Area of Science:
- Ecology
- Zoology
- Environmental Science
Background:
- Species distribution is influenced by physiology, environment, and interspecies competition.
- The allopatric distribution of five Northern Californian pocket gopher species (Thomomys spp.) suggests competitive exclusion.
- Pocket gophers are divided into two subgenera, Thomomys and Megascapheus, with distinct digging adaptations.
Purpose of the Study:
- To investigate the role of soil properties and climate in the distribution of pocket gopher species.
- To understand how soil characteristics, such as clay content and moisture, influence pocket gopher subgenera.
- To assess the impact of climate change on soil structure and its implications for vertebrate distribution.
Main Methods:
- Analysis of soil characteristics (clay percentage, bulk density, shrink-swell capacity) in pocket gopher habitats.
- Examination of historical climate data and its correlation with species replacement events.
- Assessment of the interaction between soil moisture and temperature on soil hardness.
Main Results:
- Pocket gophers inhabit soils with lower energetic costs for digging.
- Subgenera Thomomys and Megascapheus exhibit distinct soil preferences based on clay content, bulk density, and shrink-swell capacity.
- Climate change, particularly temperature and precipitation, significantly affects soil hardness by altering shrink-swell clay properties.
Conclusions:
- Soil properties, especially those influenced by moisture and climate, are critical determinants of pocket gopher distribution.
- The interaction between soil and moisture is a key, yet often overlooked, factor in vertebrate distribution.
- Current climate models need to incorporate soil hardness to accurately project species responses to climate change.
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