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First published online January 18, 2008
Journal of Experimental Biology 211, 310-316 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.012252
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Dietary sugar as a direct fuel for flight in the nectarivorous bat Glossophaga soricina

Kenneth C. Welch, Jr1,*, L. Gerardo Herrera M.2 and Raul K. Suarez1

1 Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106-9610, USA
2 Estación de Biología de Chamela, Instituto de Biología, Universidad Nacional Autónoma de México, Apartado Postal 21, 48980, San Patricio, Jalisco, México


Figure 1
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  		Fig. 1. Respiratory quotient (RQ=Formula 3CO2/Formula 3O2) (A) and {delta}13C value of expired breath ({delta}13Cbreath, {per thousand} VPDB) (B) versus time since first feeding following a fasting period (in min) for Anna's hummingbirds (C. anna; N=2) and rufous hummingbirds (S. rufus; N=10) as well as Pallas' long-tongued nectar bat (G. soricina; N=7). Data are averaged for each species.

 

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  		Fig. 2. Relationship between respiratory quotient (RQ=Formula 3CO2/Formula 3O2) and {delta}13C value of expired breath ({delta}13Cbreath, {per thousand} VPDB) during the same hover-feeding event in Anna's hummingbirds (C. anna; N=2) and rufous hummingbirds (S. rufus; N=10) as well as Pallas' long-tongued nectar bats (G. soricina; N=7). Data are pooled for each species. Pairwise comparisons reveal a significant correlation between these variables for each species (C. anna: r22=0.9767, P<0.0001; S. rufus: r81=0.9185, P<0.0001; G. soricina: r91=0.9374, P<0.0001).

 

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  		Fig. 3. Percentage of hovering (ergometer exercise in humans) metabolism supported by oxidation of exogenous sugar (fexo) during a period beginning 30 min after initial sugar solution ingestion. Values are means ± s.e.m. *(Jentjens et al., 2004bGo).

 

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© The Company of Biologists Ltd 2008