Discrimination and preferences for pollen-based cues by foraging honeybees, Apis mellifera L.

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Ranking pollen from bee plants according to their protein contribution to honey bees (2015, background): “Pernal and Currie (2002) concluded through a highly controlled indoor environment testing, that the bees are incapable of discriminating differences in protein content.”
Assessment of pollen rewards by foraging bees (2017, background): “Bees in controlled choice experiments have been found to be guided by the presence of previously experienced pollen odours (Hohmann 1970; Pernal & Currie 2002; Konzmann & Lunau 2014; Beekman, Preece & Schaerf 2016), preferring pollencontaining samples that are rich in odour over odour-poor…”
Working Towards a Holistic View on Flower Traits— How Floral Scents Mediate Plant-Animal Interactions in Concert with Other Floral Characters (2015, background): “Bumblebees can discriminate between low and high quality pollen in the field(138) and honeybees exhibit distinct preferences for pollen types in the lab.(139) However, pollen protein content seems more driven by phylogeny than pollinator preferences(140,141) and pollen–stigma interactions are likely”
Drought Stress Effect on Crop Pollination, Seed Set, Yield and Quality (2011, background): “Drought stressed flowers may have different food-based cues which decrease foraging made by honeybees (Pernal and Currie 2002).”