Ecological Release of the Anna’s Hummingbird during a Northern Range Expansion

  title={Ecological Release of the Anna’s Hummingbird during a Northern Range Expansion},
  author={Christopher J. Battey},
  journal={The American Naturalist},
  pages={306 - 315}
  • C. J. Battey
  • Published 24 July 2019
  • Environmental Science
  • The American Naturalist
During range expansions, species can experience rapid population growth if changes in climate or interspecific interactions remove limits on growth rates in novel habitats. Here I document a century of range expansion in the Anna’s hummingbird (Calypte anna) and investigate the causes of its recent abundance through a combination of demographic, climatic, and phenological analyses. Christmas Bird Count records indicate that populations have been growing in California since the early twentieth… 
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