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A Two-Species Occupancy Model with a Continuous-Time Detection Process Reveals Spatial and Temporal Interactions

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Abstract

Detection/non-detection data are increasingly collected in continuous time, e.g., via camera traps or acoustic sensors. Application of occupancy modeling approaches to these datasets typically requires discretizing the dataset to detections over individual days or weeks, which precludes analysis of temporal interactions between species or covariate relationships that change over fine temporal scales. To address this limitation, we developed a two-species occupancy model that assumes a temporal point process detection model. This model permits simultaneous analysis of species interactions in space (i.e., site occupancy) and time (i.e., activity patterns). The model is also capable of estimating the amount of time animals are available for detection, i.e., availability. We applied the model to detections of white-tailed deer (Odocoileus virginianus) and coyote (Canis latrans) collected via camera trapping. We found evidence of both temporal and spatial interactions between deer and coyote. Detection intensity of deer was greater and proportionally more diurnal where coyotes were present. At hunted sites, coyotes were more likely to occur at sites where deer were also present (and vice versa). These results highlight how two-species occupancy models with a continuous-time detection process can be used to infer temporal interactions between species. Our approach broadens the set of questions ecologists can ask regarding both spatial and temporal interactions between species, as well as fine-scale temporal covariates (e.g., weather). Our model should be increasingly applicable given the increasing availability of ecological data collected in continuous time. Supplementary materials accompanying this paper appear on-line

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Funding

This research is supported by West Virginia University Davis College of Agriculture, Natural Resources, and Design, University of Missouri, National Science Foundation Grant Nos. 1232442, 1319293, VWR Foundation, U.S. Forest Service, North Carolina Museum of Natural Sciences, Smithsonian Institution and National Institute of Food and Agriculture, US Department of Agriculture, McIntire Stennis Project Grant No. WVA00124

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Author notes

  1. Kenneth F. Kellner

    Present address: Camp Fire Program in Wildlife Conservation, SUNY College of Environmental Science and Forestry, Syracuse, NY, UK

Authors and Affiliations

  1. Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV, USA

    Kenneth F. Kellner & Christopher T. Rota

  2. North Carolina Museum of Natural Sciences, Raleigh, NC, USA

    Arielle W. Parsons & Roland Kays

  3. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, USA

    Arielle W. Parsons & Roland Kays

  4. W.A. Franke College of Forestry and Conservation, Wildlife Biology Program, University of Montana, Missoula, USA

    Joshua J. Millspaugh

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  1. Kenneth F. Kellner
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Correspondence to Kenneth F. Kellner.

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Kellner, K.F., Parsons, A.W., Kays, R. et al. A Two-Species Occupancy Model with a Continuous-Time Detection Process Reveals Spatial and Temporal Interactions. JABES 27, 321–338 (2022). https://doi.org/10.1007/s13253-021-00482-y

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