Flower Choice and Learning in Foraging Bumblebees: Effects of Variation in Nectar Volume and Concentration

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Explaining Evolutionary Shifts between Bee and Hummingbird Pollination: Convergence, Divergence, and Directionality (2008, background): “For example, bumblebees strongly prefer smaller volumes of more concentrated nectar to energetically equivalent, larger volumes of more dilute nectar (Cnaani et al. 2006).”
Yeasts in floral nectar of some South African plants: Quantification and associations with pollinator type and sugar concentration (2009, background): “On the basis of choice experiments, several authors have stated that insects (Waller, 1972; Pivnick and McNeil, 1985; Cnaani et al., 2006; Whitney et al., 2008) and birds (Stiles, 1976; Roberts, 1996) prefer nectar rewards with higher sugar concentration than dilute solutions.”