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Wednesday, April 11 • 11:00am - 11:15am
RARITY, BIODIVERSITY AND SPECIES DISTRIBUTION: A Decision Support Tool for Metapopulation Management in Dynamic Landscapes

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AUTHORS: William Fields*, Jinelle Sperry, Todd Swannack, Wade Wall – U.S. Army Corps of Engineers

ABSTRACT: Prioritizing management actions to protect endangered species presents a significant challenge because the manner in which demographic and dispersal processes scale up from habitat patches to whole landscapes is complex. This study created a spatially explicit population model of a listed species that is being considered for delisting, the black-capped vireo (Vireo atricapilla), to better understand how variation in demographic rates and habitat dynamics affect the relative importance of habitat patches for the persistence of this species. This species utilizes early successional habitat that does not persist indefinitely in the landscape, and its reproductive success is negatively impacted by predation and brood parasitism. To assess the contribution of habitat patches to black-capped vireo population dynamics, we constructed a stage-structured population model from field data on survival and movement of individuals. We incorporated patch dynamics to a landscape model to simulate habitat succession, and we tracked the number of individuals produced within habitat patches as well as the number of individuals that dispersed to other patches. Our model shows that population growth is can be limited by both predation and brood parasitism. Continued efforts to reduce brood parasitism should improve the prospects for this species persisting at levels that do not require relisting. Results also indicate areas that are more likely to contribute more individuals to the surrounding landscape and regions within the landscape that are likely to interact more strongly with one another. This information can guide continued efforts to protect this species as its listing status changes.

Wednesday April 11, 2018 11:00am - 11:15am CDT
LaSalle 2 (7th Floor)