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. 2009 Jul 31;212(16):2604–2611. doi: 10.1242/jeb.028100

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Fig. 2. — Maximal flight capacity (minimal gas density, MGD) vs body mass (M_b) for foragers (MGD_forager; open symbols) and nurses (MGD_nurse; filled symbols). Values of MGD (kg m^–3) are inverted to reflect the increasing aerodynamic demand of flying in gas mixtures of lower density. Bees that were unable to fly in air (no flight, NF; right-hand y-axis) were plotted for descriptive purposes and were not included in the calculated MANCOVA or regressions. Model II regression: MGD_forager=0.619–0.001M_b, R²<0.01, P=0.772; MGD_nurse=0.613+0.003M_b, R²=0.18, P=0.006 (broken line). MGD_total=0.061+0.007M_b, R²=0.66, P<0.001 (solid line).