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首页> 外文期刊>Ethology >Coloured and toxic nectar: feeding choices of the Madagascar giant day gecko, Phelsuma grandis.
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Coloured and toxic nectar: feeding choices of the Madagascar giant day gecko, Phelsuma grandis.

机译：有色和有毒的花蜜：马达加斯加巨型天猫壁虎（Phelsuma grandis）的觅食选择。

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摘要

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 micro M in 0.63 M sucrose) and may even prefer low nicotine concentrations to sucrose-only 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.
机译：有色花蜜是一种罕见的现象，在岛屿和岛屿的栖息地中最为人所知。岛屿也因蜥蜴授粉而闻名，其中有色花蜜可能作为吸引授粉媒介的视觉提示，为甜蜜奖励做广告。然而，花蜜也可能含有具有毒性或威慑作用的次生代谢产物。这项研究的目的是确定哪些因素对于马达加斯加巨型天壁虎（Phelsuma grandis）的海岛传粉者而言是重要的人工花蜜选择决定因素：人工花蜜色，人工花蜜色饱和度，人工花蜜显眼性和/或是否存在花蜜。生物碱尼古丁。发现彩色人造花蜜和最暗的人造花蜜色彩饱和度是壁虎的重要视觉线索，而人造花蜜与花瓣颜色之间的对比则不是。壁虎只能通过高尼古丁浓度（0.63 M蔗糖中的1000 micro M）来阻止，甚至比仅蔗糖的溶液更喜欢低尼古丁浓度。考虑到它们对糖溶液的总体喜好，马达加斯加的巨型壁虎很可能是马达加斯加植物物种的重要传粉者，它们产生足够的花蜜来吸引它们，有色花蜜和/或次生代谢产物的植物可能已经进化出这些特性来吸引壁虎。特定。

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