title: An integrated data model to estimate spatiotemporal occupancy, abundance, and colonization dynamics.
abstract: Ecological invasions and colonizations occur dynamically through space and time. Estimating the distribution and abundance of colonizing species is critical for efficient management or conservation. We describe a statistical framework for simultaneously estimating spatiotemporal occupancy and abundance dynamics of a colonizing species. Our method accounts for several issues that are common when modeling spatiotemporal ecological data including multiple levels of detection probability, multiple data sources, and computational limitations that occur when making fine-scale inference over a large spatiotemporal domain. We apply the model to estimate the colonization dynamics of sea otters (Enhydra lutris) in Glacier Bay, in southeastern Alaska.
authors.affiliation: Department of Fish, Wildlife, and Conservation Biology, Colorado Cooperative Fish and Wildlife Research Unit, Colorado State University, Fort Collins, Colorado, 80523, USA.|Department of Statistics, Colorado State University, Fort Collins, Colorado, 80523, USA.
authors.forename: Perry J
authors.initials: PJ
authors.lastname: Williams
authors.affiliation: Department of Statistics, Colorado State University, Fort Collins, Colorado, 80523, USA.|Department of Fish, Wildlife, and Conservation Biology, Colorado Cooperative Fish and Wildlife Research Unit, U.S. Geological Survey, Colorado State University, Fort Collins, Colorado, 80523, USA.
authors.forename: Mevin B
authors.initials: MB
authors.lastname: Hooten
authors.affiliation: Southeast Alaska Inventory and Monitoring Network, National Park Service, 3100 National Park Rd, Juneau, Alaska, 99801, USA.|Glacier Bay Field Station, National Park Service, 3100 National Park Rd, Juneau, Alaska, 99801, USA.
authors.forename: Jamie N
authors.initials: JN
authors.lastname: Womble
authors.affiliation: Alaska Science Center, U.S. Geological Survey, 4210 University Drive, Anchorage, Alaska, 99508, USA.
authors.forename: George G
authors.initials: GG
authors.lastname: Esslinger
authors.affiliation: Southeast Alaska Inventory and Monitoring Network, National Park Service, 3100 National Park Rd, Juneau, Alaska, 99801, USA.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Bower
authors.affiliation: Department of Statistics, Kansas State University, Manhattan, Kansas, 66506, USA.
authors.forename: Trevor J
authors.initials: TJ
authors.lastname: Hefley
mesh_terms: D000818:Animals; D004463:Ecology; D017753:Ecosystem; D008962:Models, Theoretical; D010041:Otters / Q000502:physiology*; D011157:Population Dynamics
keywords: ecological diffusion; homogenization; hurdle model; integrated population model; partial differential equation; sea otters; state-space model; zero-inflated model