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The Brownian bridge synoptic model of habitat selection and space use for animals using GPS telemetry data

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  • Wells, Adam G.
  • Blair, Colby C.
  • Garton, Edward O.
  • Rice, Clifford G.
  • Horne, Jon S.
  • Rachlow, Janet L.
  • Wallin, David O.

Abstract

The growing application of GPS telemetry in wildlife studies created need for analytical methods to meet both practical and theoretical concerns when conducting analyses of habitat or resource selection. We devised a new analysis approach of individual-based movement models for estimation of resource selection based on probability of use. We merged the Brownian bridge model of space use with the synoptic model of habitat selection to describe and estimate patterns of habitat selection from GPS telemetry data. In doing so, our approach implicitly defines availability based on movement data when conducting analysis of GPS telemetry data. To do so, we employed a step-by-step approach, based on sequential triplets of observations of the animals’ movements. Availability was portrayed as a circular normal distribution at every middle GPS location, based on the existing Brownian bridge model of space use. This middle observation within the sequential triplet also reflected habitat selection, estimated by maximum likelihoods, based on the deviation from otherwise random movement between the first and third observations. This approach allowed each triplet across time to be treated as independent, identically distributed observations when estimating habitat selection. To demonstrate the utility of the model, we analyzed GPS location data collected from free-ranging mountain goats (Oreamnos americanus) in the Cascade Mountains of the western United States to evaluate patterns of habitat selection while foraging during late spring and early summer. Slope of the terrain was the primary factor influencing resource selection by mountain goats in our study, with females selecting steeper areas closer to escape terrain than males. Finally, we derived a resource selection function applicable over a broad geographic extent to evaluate sites for potential release of mountain goats to augment the population in Washington, which has declined over the last 50 years.

Suggested Citation

  • Wells, Adam G. & Blair, Colby C. & Garton, Edward O. & Rice, Clifford G. & Horne, Jon S. & Rachlow, Janet L. & Wallin, David O., 2014. "The Brownian bridge synoptic model of habitat selection and space use for animals using GPS telemetry data," Ecological Modelling, Elsevier, vol. 273(C), pages 242-250.
    • Handle: RePEc:eee:ecomod:v:273:y:2014:i:c:p:242-250
    DOI: 10.1016/j.ecolmodel.2013.11.008
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    References listed on IDEAS

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    1. Devin S. Johnson & Dana L. Thomas & Jay M. Ver Hoef & Aaron Christ, 2008. "A General Framework for the Analysis of Animal Resource Selection from Telemetry Data," Biometrics, The International Biometric Society, vol. 64(3), pages 968-976, September.
    2. Horne, Jon S. & Garton, Edward O. & Rachlow, Janet L., 2008. "A synoptic model of animal space use: Simultaneous estimation of home range, habitat selection, and inter/intra-specific relationships," Ecological Modelling, Elsevier, vol. 214(2), pages 338-348.
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    Cited by:

    1. Wallentin, Gudrun, 2017. "Spatial simulation: A spatial perspective on individual-based ecology—a review," Ecological Modelling, Elsevier, vol. 350(C), pages 30-41.

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