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  Fruit bats (pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars

Amitai, O., Holtze, S., Barkan, S., Amichai, E., Korine, C., Pinshow, B., et al. (2010). Fruit bats (pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars. The Journal of Experimental Biology, 213(15), 2693-2699. doi:10.1242/jeb.043505.

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Genre: Zeitschriftenartikel

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https://doi.org/10.1242/jeb.043505 (Verlagsversion)
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 Urheber:
Amitai, O.1, Autor
Holtze, Susanne2, Autor           
Barkan, S.3, Autor
Amichai, E.3, Autor
Korine, C.4, 5, Autor
Pinshow, B.1, 4, Autor
Voigt, C. C.6, Autor
Affiliations:
1Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel, ou_persistent22              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
3Department of Zoology, Tel-Aviv University, Israel, ou_persistent22              
4Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, Israel, ou_persistent22              
5Ramon Science Center, Mitzpe Ramon, Israel , ou_persistent22              
6Evolutionary Ecology Research Group, Leibniz Institute for Zoo and Wildlife Research, Germany, ou_persistent22              

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Schlagwörter: Chiroptera; Flight; Metabolic rate; Stable isotopes
 Zusammenfassung: Previous studies reported that fed bats and birds mostly use recently acquired exogenous nutrients as fuel for flight, rather than endogenous fuels, such as lipids or glycogen. However, this pattern of fuel use may be a simple size-related phenomenon because, to date, only small birds and bats have been studied with respect to the origin of metabolized fuel, and because small animals carry relatively small energy reserves, considering their high mass-specific metabolic rate. We hypothesized that -150g Egyptian fruit bats (Rousettus aegyptiacus Pteropodidae), which are more than an order of magnitude heavier than previously studied bats, also catabolize dietary sugars directly and exclusively to fuel both rest and flight metabolism. We based our expectation on the observation that these animals rapidly transport ingested dietary sugars, which are absorbed via passive paracellular pathways in the intestine, to organs of high energy demand. We used the stable carbon isotope ratio in exhaled CO2 (δ13Cbreath) to assess the origin of metabolized substrates in 16 Egyptian fruit bats that were maintained on a diet of C3 plants before experiments. First, we predicted that in resting bats δ13Cbreath remains constant when bats ingest C3 sucrose, but increases and converges on the dietary isotopic signature when C4 sucrose and C4 glucose are ingested. Second, if flying fruit bats use exogenous nutrients exclusively to fuel flight, we predicted that S13C breath of flying bats would converge on the isotopic signature of the C4 sucrose they were fed. Both resting and flying Egyptian fruit bats, indeed, directly fuelled their metabolism with freshly ingested exogenous substrates. The rate at which the fruit bats oxidized dietary sugars was as fast as in 1Og nectar-feeding bats and 5g hummingbirds. Our results support the notion that flying bats, irrespective of their size, catabolize dietary sugars directly, and possibly exclusively, to fuel flight. © 2010. Published by The Company of Biologists Ltd.

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 Datum: 2010-05-042010
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000279978500026
DOI: 10.1242/jeb.043505
PMID: 20639431
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Förderorganisation : Blaustein Center for Scientific Cooperation
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Förderorganisation : Ben-Gurion University of the Negev
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Förderorganisation : The Open University of Israel
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Förderorganisation : Tel Aviv University Department of Zoology
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Förderorganisation : he Hebrew University Department of Evolution, Systematics and Ecology
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Förderorganisation : Haifa University Department of Biology Teaching at Oranim
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Förderorganisation : Zoological Society of Israel
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Förderorganisation : Dryland Research-Specific Action

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Titel: The Journal of Experimental Biology
Genre der Quelle: Zeitschrift
 Urheber:
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Ort, Verlag, Ausgabe: London : Published for the Company of Biologists Ltd. by the Cambridge University Press
Seiten: - Band / Heft: 213 (15) Artikelnummer: - Start- / Endseite: 2693 - 2699 Identifikator: ISSN: 0022-0949
CoNE: https://pure.mpg.de/cone/journals/resource/110992357319088_1