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Testing hypotheses on distribution shifts and changes in phenology of imperfectly detectable species

AuthorsChambert, Thierry; Kendall, William Louis; Hines, James E.; Nichols, James D.; Pedrini, Paolo; Waddle, J. Hardin; Tavecchia, Giacomo ; Walls, Susan C.; Tenan, Simone
KeywordsClosure assumption
Occupancy modelling
Species distribution models
Species phenology
Staggered-entry model
Issue Date28-Mar-2015
PublisherJohn Wiley & Sons
CitationMethods in Ecology and Evolution 6(6): 638-647 (2015)
Abstract© 2015 British Ecological Society. With ongoing climate change, many species are expected to shift their spatial and temporal distributions. To document changes in species distribution and phenology, detection/non-detection data have proven very useful. Occupancy models provide a robust way to analyse such data, but inference is usually focused on species spatial distribution, not phenology. We present a multi-season extension of the staggered-entry occupancy model of Kendall et al. (2013, Ecology, 94, 610), which permits inference about the within-season patterns of species arrival and departure at sampling sites. The new model presented here allows investigation of species phenology and spatial distribution across years, as well as site extinction/colonization dynamics. We illustrate the model with two data sets on European migratory passerines and one data set on North American treefrogs. We show how to derive several additional phenological parameters, such as annual mean arrival and departure dates, from estimated arrival and departure probabilities. Given the extent of detection/non-detection data that are available, we believe that this modelling approach will prove very useful to further understand and predict species responses to climate change.
Publisher version (URL)http://dx.doi.org/10.1111/2041-210X.12362
Identifiersdoi: 10.1111/2041-210X.12362
issn: 2041-210X
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