NDLI: Modeling occupancy dynamics of a rare species, Franklin’s ground squirrel, with limited data: are simple connectivity metrics adequate?

Content Provider	Springer Nature Link
Author	Duggan, Jennifer M. Schooley, Robert L. Heske, Edward J.
Copyright Year	2011
Abstract	Conservation of populations in fragmented habitats is often based on spatially realistic metapopulation theory, which predicts negative relationships between patch extinction and area and patch colonization and isolation. Cost-distance metrics have been developed to integrate habitat quality into measures of connectivity, and thus may improve predictive power of the area-isolation paradigm. Few studies use empirical data to compare predictive performance of complex cost-distance metrics to simple metrics relying on Euclidean distances. We used 3 years of presence–absence data to examine relative influence of habitat quality, habitat area, and connectivity on occupancy and extinction rates for Poliocitellus franklinii (Franklin’s ground squirrel), a rare grassland species of conservation concern. We calculated connectivity using nearest-neighbor (NN) and incidence function model (IFM) metrics based on Euclidean and cost-distances. Habitat quality, area, and connectivity were all positive predictors for occupancy, but only isolation was a positive predictor of extinction. P. franklinii does not appear to be a tallgrass prairie obligate, but the species distribution is limited by isolation of suitable grassland habitat. A simple NN metric measuring Euclidean distance between a target area and nearest occupied source outperformed IFM (Euclidean and cost-distance) in predicting occupancy and extinction for P. franklinii. Although NN metrics are criticized for considering only the contribution of the source nearest to a target, this simplicity may be acceptable when measuring connectivity for rare species with few occupied habitat patches within dispersal distance.
Starting Page	1477
Ending Page	1490
Page Count	14
File Format	PDF
ISSN	09212973
Journal	Landscape Ecology
Volume Number	26
Issue Number	10
e-ISSN	15729761
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-09-04
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Incidence function model Cost-distance modeling Metapopulation Midwestern USA Nearest neighbor Poliocitellus franklinii Spermophilus franklinii Prairie Forestry Ecology Landscape Ecology Plant Ecology Plant Sciences Forestry Management
Content Type	Text
Resource Type	Article
Subject	Geography, Planning and Development Ecology Nature and Landscape Conservation

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