Pollination of Campanula rapunculus L. (Campanulaceae): How much pollen flows into pollination and into reproduction of oligolectic pollinators?

By C. Schlindwein, Dieter Wittmann, C. Martins, A. Hamm, J. A. Siqueira, D. Schiffler, Inês Machado. Plant Systematics and Evolution, 2005

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Closely related pollen generalist bees differ in their ability to develop on the same pollen diet: evidence for physiological adaptations to digest pollen (2011, background): “…portioned pollen release over an extended period of time does not only increase the probability of successful pollination by enforcing repeated pollinator visits (Harder & Wilson 1994; Schlindwein et al. 2005), but is expected to limit pollen loss to bees as well (Castellanos et al. 2006).”
Gauging the Effect of Honey Bee Pollen Collection on Native Bee Communities (2017, background): “Although this assumption has not been directly addressed, three available studies using different oligolectic bees and their floral hosts reported that 97– 99% of available pollen was removed daily by native bees alone (Schlindwein et al. 2005; Larsson 2006; Larsson & Franzen 2007).”
Pollen and nectar quality drive the major and minor floral choices of bumble bees (2014, background): “Bee-pollinated plant species usually show nectar and pollen of high quality (i.e., nutritional value) and/or in large amounts (but see Ayasse et al. 2011; Juillet and Scopece 2010), though these represent energy costs (Proctor et al. 1996; Schlindwein et al. 2005).”