On flying insect size and Phanerozoic atmospheric oxygen

@article{Dorrington2012OnFI,
  title={On flying insect size and Phanerozoic atmospheric oxygen},
  author={Graham E. Dorrington},
  journal={Proceedings of the National Academy of Sciences},
  year={2012},
  volume={109},
  pages={E3393 - E3393}
}
  • G. Dorrington
  • Published 5 November 2012
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences
In a recent article in PNAS, Clapham and Karr (1) related the maximum wing length (MWL) of different Odonatoptera and Orthoptera species to Phanerozoic atmospheric oxygen partial pressure (pO2) as predicted by the GEOCARBSULF model (2). They argued that the MWL data assigned to 10-Myr periods is well correlated with elevated Paleozoic pO2 levels, but that the correlation weakens and is ultimately decoupled during the Mesozoic and Cenozoic. To explain the correlation, they assumed that maximum… 
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It is argued that oxygen is not an important control on insect size and that selective pressure for maneuverability and predator escape is not inversely related to body size, but the hypothesis that controls on maximum insect size shifted from environmental to biotic following the evolution of flying predators like birds is stood by.
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Interspecific differences in short-duration powered flight and takeoff ability are shown to be caused primarily by differences in flight muscle ratio, which ranges from 0.115 to 0.560 among species studied to date.
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Summary1.The rate of oxygen consumption for honeybees hovering at normal air pressure was 94.3 ml O2 g−1 h−1. The rate of oxygen consumption declined for honeybees hovering at higher air pressures,