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Microclimate Refugia: Comparing Modeled to Empirical Near-Surface Temperatures on Rangeland

Author

Listed:
  • Robert B. Srygley

    (Pest Management Research Unit, Agricultural Research Service, 1500 N. Central Ave., Sidney, MT 59270, USA)

  • Jacob I. Dixon

    (Pest Management Research Unit, Agricultural Research Service, 1500 N. Central Ave., Sidney, MT 59270, USA
    Department of Ecology and Evolutionary Biology, Tulane University, 6823 St. Charles Ave., New Orleans, LA 70118, USA)

  • Patrick D. Lorch

    (Southern Sierra Research Station, 7872 Fay Ranch Road, Weldon, CA 93283, USA)

Abstract

Microhabitats can provide thermal niches that affect geographic range shifts of species as the climate changes and provide refuges for pest and beneficial insect populations in agricultural regions. The spatial distribution of microhabitats is influenced by topography that can influence local extinction and recolonization by animal populations. Scaling local temperature-dependent processes to a regional scale of population expansion, and contraction requires the validation of biophysical models of near surface temperatures. We measured temperature at 2.5 cm above and below ground at 25 sites in each of the two regions: southern and northern Utah, USA. Using NichMapR version 3.2.0, we modeled the temperature at these same sites with local slopes and aspects for four years for the former and eight years for the latter region. Empirical and modeled air temperatures differed by 7.4 °C, on average, and soil temperatures differed less (4.4 °C, on average). Site-specific additions of hill shading at 25 m distance or soil parameters did not improve the agreement of the empirical and modeled temperatures. A hybrid model for air temperature that incorporated soil temperature at 0 cm depth when snow depth exceeded 3 cm resulted in an average improvement of 8% that was as great as 31%. Understanding biological processes at the regional scale and in projected future climates will continue to require biophysical modeling. To achieve the widest applications possible, biophysical models such as NichMapR need to be validated with empirical data from as wide a variety of altitudes, latitudes, soil types, and topographies wherein organisms currently inhabit and where their ranges might expand to in the future.

Suggested Citation

  • Robert B. Srygley & Jacob I. Dixon & Patrick D. Lorch, 2023. "Microclimate Refugia: Comparing Modeled to Empirical Near-Surface Temperatures on Rangeland," Geographies, MDPI, vol. 3(2), pages 1-15, May.
  • Handle: RePEc:gam:jgeogr:v:3:y:2023:i:2:p:18-358:d:1144377
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    References listed on IDEAS

    as
    1. Bennie, Jonathan & Huntley, Brian & Wiltshire, Andrew & Hill, Mark O. & Baxter, Robert, 2008. "Slope, aspect and climate: Spatially explicit and implicit models of topographic microclimate in chalk grassland," Ecological Modelling, Elsevier, vol. 216(1), pages 47-59.
    2. M. D. Petrie & J. B. Bradford & W. K. Lauenroth & D. R. Schlaepfer & C. M. Andrews & D. M. Bell, 2020. "Non-analog increases to air, surface, and belowground temperature extreme events due to climate change," Climatic Change, Springer, vol. 163(4), pages 2233-2256, December.
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