Support for a relationship between demography and modeled habitat suitability is scale dependent for the Purple Martin, Progne subis

1. Species distribution models (SDMs) estimate habitat suitability for species in geographic space. They are extensively used in conservation under the assumption that there is a positive relationship between habitat suitability and species success and stability. 2. Given the difficulties in obtaining demographic data across a species’ range, this assumption is rarely tested. Here we provide a range-wide test of this relationship for the eastern subspecies of purple martin (Progne subis subis). 3. We build a well-supported SDM for the breeding range of the purple martin, and pair it with an unparalleled demographic dataset of nest success and local and regional abundance data for the species to test the proposed link between habitat suitability and fecundity and demography. 4. We find a positive relationship between regional abundance and habitat suitability but no relationship between local abundance or fecundity and habitat suitability. 5. Our data suggest that local succe...1. 物种分布模型（Species Distribution Models，SDMs）可估算物种在地理空间中的栖息地适宜性。该模型被广泛应用于保护生物学领域，其核心假设为栖息地适宜性与物种存续及种群稳定性呈正相关关系。 2. 由于难以获取物种分布全域的种群统计数据，该假设极少得到验证。本研究针对紫崖燕东部亚种（*Progne subis subis*）开展了该关联的全分布区检验。 3. 本研究构建了紫崖燕繁殖分布区的具有充分统计支持的物种分布模型，并将其与该物种前所未有的巢繁殖成功率、局域及区域种群丰度数据集相结合，以验证栖息地适宜性与繁殖力及种群动态之间的预设关联。 4. 研究结果显示，区域种群丰度与栖息地适宜性呈正相关关系，但局域种群丰度或繁殖力与栖息地适宜性之间无显著关联。 5. 本研究数据表明，局域存续……