Why do some, but not all, tropical birds migrate? A comparative study of diet breadth and fruit preference

@article{Boyle2010WhyDS,
  title={Why do some, but not all, tropical birds migrate? A comparative study of diet breadth and fruit preference},
  author={W. Alice Boyle and Courtney J. Conway and Judith L. Bronstein},
  journal={Evolutionary Ecology},
  year={2010},
  volume={25},
  pages={219-236}
}
Annual migrations of birds profoundly influence terrestrial communities. However, few empirical studies examine why birds migrate, in part due to the difficulty of testing causal hypotheses in long-distance migration systems. Short-distance altitudinal migrations provide relatively tractable systems in which to test explanations for migration. Many past studies explain tropical altitudinal migration as a response to spatial and temporal variation in fruit availability. Yet this hypothesis fails… 
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