Sugar preferences of avian nectarivores are correlated with intestinal sucrase activity

dc.contributor.authorNapier, Kathryn R.
dc.contributor.authorMcWhorter, Todd J.
dc.contributor.authorNicolson, Sue W.
dc.contributor.authorFleming, Patricia A.
dc.date.accessioned2013-09-26T08:25:13Z
dc.date.available2013-09-26T08:25:13Z
dc.date.issued2013
dc.description.abstractNectar-feeding birds generally demonstrate preference for hexose solutions at low sugar concentrations, switching to sucrose/no preference at higher concentrations. Species vary in the concentration at which the switch from hexose preference occurs; this could reflect physiological constraints that would also influence nectar selection when foraging. We recorded concentration-dependent sugar type preferences in three opportunistic/generalist Australian nectarivorous species: Dicaeum hirundinaceum, Zosterops lateralis and Lichenostomus virescens. All three preferred hexoses up to sugar concentrations of 0.25 mol·L-1 and switched to sucrose/no preference for higher concentrations. Using these and literature records, we investigated physiological mechanisms that may explain the concentration-dependence of sugar type preferences and compared diet preference data with foraging records. We measured sucrase activity in Z. lateralis and L. virescens as well as three specialized nectarivorous species (Anthochaera carunculata, Phylidonyris novaehollandiae and Trichoglossus haematodus) for comparison with published concentration-dependent sugar preference data. Sucrase activity varied between these species (P=0.003). The minimum diet concentration at which birds show no sugar preference was significantly correlated with sucrase activity for the eleven species analyzed (P=0.005). Birds with the lowest sucrase activity showed hexose preference at higher diet concentrations and birds with the greatest sucrase activity either showed no hexose preference or hexose preference on only the most dilute diets. Foraging data compiled from the literature also support the laboratory analyses, e.g. T. haematodus (preference for hexose over a wide range of diet concentrations, low sucrase activity) also feed primarily on hexose nectars in the wild. Intestinal sucrase activity is likely to contribute to diet selectivity in nectarivorous bird species.en
dc.description.librarianhb2013en
dc.description.librarianab2013
dc.description.sponsorshipKRN was supported by the Holsworth Wildlife Research Endowment, the Stuart Leslie Bird Research Award (Birdlife Australia, formerly Birds Australia), and Australian Research Council (ARC DP0665730).en
dc.description.urihttp://www.jstor.orgen
dc.identifier.citationNapier, KR, McWhorter, TJ, Nicolson, SW & Fleming, PA 2013, 'Sugar preferences of avian nectarivores are correlated with intestinal sucrase activity', Physiological and Biochemical Zoology, vol. 86, no. 5, pp. 499-514.en
dc.identifier.issn1522-2152 (print)
dc.identifier.issn1537-5293 (online)
dc.identifier.other10.1086/672013
dc.identifier.urihttp://hdl.handle.net/2263/31821
dc.language.isoenen
dc.publisherUniversity of Chicago Pressen
dc.rights© 2013 by The University of Chicago. All rights reserved.en
dc.subjectFructoseen
dc.subjectGlucoseen
dc.subjectHexosesen
dc.subjectHoneyeateren
dc.subjectHummingbirden
dc.subjectIntestinal enzymesen
dc.subjectMaltaseen
dc.subjectSucroseen
dc.subjectSunbirden
dc.subject.lcshNectarivoresen
dc.subject.lcshNectaren
dc.subject.lcshBirdsen
dc.subject.lcshHexose phosphatesen
dc.titleSugar preferences of avian nectarivores are correlated with intestinal sucrase activityen
dc.typePostprint Articleen

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