Pollen and nectar quality drive the major and minor floral choices of bumble bees

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Pollination reservoirs for wild bee habitat enhancement in cropping systems: a review (2017, background): “Somme et al. (2015) analyzed the quality and quantity of floral rewards to bumble bees inmajor foraging resources in Belgian peatland.”
Pollen nutrients better explain bumblebee colony development than pollen diversity (2017, background): “Although different studies have shown that bumblebees tend to forage on resources with high amino acid content (Leonhardt & Bl€uthgen, 2012; Somme et al., 2015; Kriesell et al., 2016), the main foraged resource in the Upper Ardennes (i.e. V. uliginosum) belongs to Ericaceae (Mayer et al., 2012),…”
Assessment of pollen rewards by foraging bees (2017, background): “Many are correlational, relating bees’ foraging preferences in the field to the levels of a particular nutrient(s) found in the pollen provided by different plant species (Robertson et al. 1999; Hanley et al. 2008; Leonhardt & Bl€ uthgen 2012; Somme et al. 2015).”
Food in a row: urban trees offer valuable floral resources to pollinating insects (2016, background): “Furthermore, because urban trees provide pollen with a balanced amino acid content, they are likely to be attractive to pollen-collecting insects (Hanley et al. 2008; Weiner et al. 2010; Somme et al. 2015).”