Morphological constraint on egg size: a challenge to optimal egg size theory?

  title={Morphological constraint on egg size: a challenge to optimal egg size theory?},
  author={Justin D. Congdon and J Whit®eld Gibbons},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={84 12},
Some freshwater turtles appear unable to produce eggs large enough to achieve the balance between size and number of eggs predicted by optimal egg size theory. We present evidence that pelvic girdle structure constrains egg size and thus offspring size in females of smaller-bodied species (Chrysemys picta and Deirochelys reticularia). The constraint is demonstrated by the correspondence of slopes of the increase of the pelvic aperture and egg width with increasing body size. This constraint… CONTINUE READING
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