Extreme Intraclutch Egg-Size Dimorphism in Eudyptes Penguins, an Evolutionary Response to Clutch-Size Maladaptation

@article{Stein2013ExtremeIE,
  title={Extreme Intraclutch Egg-Size Dimorphism in Eudyptes Penguins, an Evolutionary Response to Clutch-Size Maladaptation},
  author={R. W. Stein and T. Williams},
  journal={The American Naturalist},
  year={2013},
  volume={182},
  pages={260 - 270}
}
  • R. W. Stein, T. Williams
  • Published 2013
  • Biology, Medicine
  • The American Naturalist
  • Eudyptes penguins (six species) are uniquely characterized by a two-egg clutch with extreme intraclutch egg-size dimorphism (ESD): the first-laid A-egg is 17.5%–56.9% smaller than the B-egg. Although A-eggs are viable, they almost never produce fledged chicks (genus average <1%). Using classical life-history theory and phylogenetic comparative methods, we demonstrate a marked slowdown in the life history of Eudyptes: age of first reproduction is 52% later and annual fecundity 48% lower compared… CONTINUE READING
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