Linkage between diet humidity,metabolic water production and heat dissipation in the larvae of Galleria mellonella |
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| Affiliation: | 1. Comer Children''s Hospital, University of Chicago Medicine, Chicago, IL, USA;2. Texas Children''s Hospital, Houston, TX, USA;3. Seattle Children''s Hospital, Seattle, WA, USA;4. Children''s Hospital of Pittsburgh, Pittsburgh, PA, USA;5. Children''s Hospital of Philadelphia, Philadelphia, PA, USA;1. Section of Urology, Department of Surgery, University of Chicago Pritzker School of Medicine, Chicago, Illinois;2. Section of General Surgery, Department of Surgery, University of Chicago Pritzker School of Medicine, Chicago, Illinois;1. Yerkes National Primate Research Center, Emory University, Atlanta, GA, United States;2. Department of Psychology, Emory University, Atlanta, GA, United States;3. University of Texas at San Antonio, Biology Department, One UTSA Circle, San Antonio, TX 78249, United States |
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| Abstract: | Last instar Galleria larvae respond to a decrease of dietary water content from 12 to 1% by reducing their energetic net growth efficiency from 42.5 to 36.3%. This reduction is linked to increased production of metabolic water, the proportion of which in total water requirement increases from 57 to 97%. Fluctuations in metabolic water output are controlled by changes in oxidative catabolism of the same type of substrates (respiratory quotient is identical under different water regimes). Elevated generation of metabolic water is associated with increased metabolic flow and with enhanced uncoupling of mitochondrial respiration from oxidative phosphorylation. The uncoupling allows for large and variable production of metabolic water in insects adapted to dry environments: the relative degree of uncoupling is 43.3% in Cydia larvae, which live in excess water, but 52.3% in the larvae of Ephestia, which live on a dry substrate; fluctuations between 54.4 and 59.6% in the larvae of Galleria depend on dietary moisture and larval age. |
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