Coloured and toxic nectar : feeding choices of the Madagascar giant day gecko, Phelsuma grandis

Show simple item record Minnaar, I.A. (Ingrid Ane) Kohler, Angela Purchase, Cromwell Nicolson, Sue W. 2013-07-12T07:29:06Z 2014-05-31T00:20:08Z 2013-05
dc.description.abstract Coloured nectar is a rare phenomenon best known from islands and insular habitats. Islands are also known for lizard pollination, where coloured nectar potentially acts as a visual cue to attract pollinators, advertising the sweet reward. However, nectar may also contain secondary metabolites with toxic or deterrent effects. The aim of this study was to determine which factors are important as artificial nectar choice determinants to the Madagascar giant day gecko, Phelsuma grandis, an island pollinator: artificial nectar colour, artificial nectar colour saturation, artificial nectar conspicuousness and/or the presence of the alkaloid nicotine. Coloured artificial nectar and the darkest artificial nectar colour saturation were found to be important visual cues for the geckos, while the contrast between artificial nectar and petal colour was not. Geckos were deterred only by high nicotine concentrations (1000 lM in 0.63 M sucrose) and may even prefer low nicotine concentrations to sucroseonly solutions. Given their overall fondness for sugar solutions, Madagascar giant day geckos are likely to be important pollinators of Malagasy plant species that produce enough nectar to attract them, and plants with coloured nectar and/or secondary metabolites may have evolved those traits to attract the geckos in particular. en
dc.description.librarian hb2013 en
dc.description.librarian ab2013
dc.description.sponsorship This work was supported by the South African National Research Foundation (grant number 73671) and the University of Pretoria. en
dc.description.uri en
dc.identifier.citation Minnaar, IA, Köhler, A, Purchase C & Nicolson, SW 2013, 'Coloured and toxic nectar : feeding choices of the Madagascar giant day gecko, Phelsuma grandis', Ethology, vol. 119, no. 5, pp.417-426. en
dc.identifier.issn 0179-1613 (print)
dc.identifier.issn 1439-0310 (online)
dc.identifier.other 10.1111/eth.12079
dc.language.iso en en
dc.publisher Wiley-Blackwell en
dc.rights © 2013 Blackwell Verlag GmbH. The definite version is available at en
dc.subject Geckos en
dc.subject Madagascar en
dc.subject Phelsuma grandis en
dc.subject.lcsh Phelsuma en
dc.subject.lcsh Nectar en
dc.subject.lcsh Nectarivores en
dc.title Coloured and toxic nectar : feeding choices of the Madagascar giant day gecko, Phelsuma grandis en
dc.type Postprint Article en

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