Are mountain passes higher in the tropics? Janzen's hypothesis revisited.

@article{Ghalambor2006AreMP,
  title={Are mountain passes higher in the tropics? Janzen's hypothesis revisited.},
  author={Cameron K Ghalambor and Raymond B. Huey and Paul R Martin and Joshua J Tewksbury and George W. Wang},
  journal={Integrative and comparative biology},
  year={2006},
  volume={46 1},
  pages={
          5-17
        }
}
Synopsis In 1967 Daniel Janzen published an influential paper titled "Why Mountain Passes Are Higher in the Tropics." Janzen derived a simple climatic-physiological model predicting that tropical mountain passes would be more effective barriers to organismal dispersal than would temperate-zone passes of equivalent altitude. This prediction derived from a recognition that the annual variation in ambient temperature at any site is relatively low in the tropics. Such low variation within sites not… CONTINUE READING

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Geographical ecology

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