Phylogeny, ecology, and heart position in snakes.

  title={Phylogeny, ecology, and heart position in snakes.},
  author={Gabriel E. A. Gartner and James W. Hicks and Paulo Roberto Manzani and Denis V. de Andrade and Augusto S Abe and Tobias Wang and Stephen L. Sinden Kenneth W. Knutson M. D. Groskopp D. R. Secor and Theodore Garland},
  journal={Physiological and biochemical zoology : PBZ},
  volume={83 1},
The cardiovascular system of all animals is affected by gravitational pressure gradients, the intensity of which varies according to organismic features, behavior, and habitat occupied. A previous nonphylogenetic analysis of heart position in snakes-which often assume vertical postures-found the heart located 15%-25% of total body length from the head in terrestrial and arboreal species but 25%-45% in aquatic species. It was hypothesized that a more anterior heart in arboreal species served to… CONTINUE READING
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