Poleward shifts in winter ranges of North American birds.

@article{Sorte2007PolewardSI,
  title={Poleward shifts in winter ranges of North American birds.},
  author={Frank A La Sorte and Frank R. Thompson},
  journal={Ecology},
  year={2007},
  volume={88 7},
  pages={1803-12}
}
Climate change is thought to promote the poleward movement of geographic ranges; however, the spatial dynamics, mechanisms, and regional anthropogenic drivers associated with these trends have not been fully explored. We estimated changes in latitude of northern range boundaries, center of occurrence, and center of abundance for 254 species of winter avifauna in North America from 1975 to 2004. After accounting for the effect of range size and the location of the northern boundary, positive… CONTINUE READING

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