The effect of fruit abundance, conspicuousness and sugar concentration on fruit colour choice by captive silvereyes
作者： S. Giles , A. Lill
DOI: 10.1080/08927014.1999.9522825
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摘要: Wild-caught, captive silvereyes (Zosterops lateralis, Zosteropidae) were given choice tests to determine how some traits of fleshy fruits interact influence fruit selection by this facultative frugivore. When a between red and white the polymorphic Fragrant saltbush (Rhagodia parabolica, Chenopodiaceae), silvereyes' preference for was enhanced when they twice as abundant, but reversed only half fruits. Given artificial fruits, showed 2.3-fold latter both equally conspicuous; significantly relatively more conspicuous (greater contrast with background colour), eliminated cryptic (less colour). A third experiment that sugar concentration influenced birds' colour preference, enhancing ...
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