Data from: Declining demographic performance and dispersal limitation influence the geographic distribution of the perennial forb, Astragalus utahensis (fabaceae)

Kathryn C. Baer & John L. Maron
1. A central goal of ecology is understanding the determinants of species’ distributions. ‘Metapopulation’ models for the existence of distributional boundaries predict that species’ geographic ranges arise from the landscape-scale deterioration of habitat suitability towards the range edge (i.e. niche mechanisms), which simultaneously hinders demographic performance and limits dispersal to suitable habitat beyond the edge (i.e. dispersal limitation). However, few studies have examined both of these mechanisms for the same species by examining abundance and...
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