Dear colleagues, Is anyone aware of a theoretical model predicting under which conditions or circumstances a pollen rewarding species should evolve nectar or any other flower resource?
Dear André I can't answer your question. Forgive me. Can auxilar in other possible future issues. Att. Nara.
Have you contacted Dr Graham Pyke? He does modeling with nectar regarding optimal foraging by the primary pollinators. Please consider writing Graham Pyke
Current phylogenetic treatment of orchids in the Tribe Diurideae strongly suggests that some genera that secrete nectar were derived from ancestors with mimetic flowers that made no nectar at all. Please see Chapter 5 (or 6?) by P. Weston, James Indsto and Marc Clements in "Darwin's Orchids; Then and Now *2014) University of Chicago Press. A second option would be to read the chapter on Neotropical epidendroids (Catasinteae) by David Roubik who looked at changes in tropical orchid lineages from nectar, to food mimicry, to the production of essential oils collected excslsively by male euglossine bees. That's Chapter 8 in the same book, I think.
Also, you may want to consider Chapter 5 in "The Biology of Anthers" (Cambridge U. Press; D'Arcy and Keating editors, 1996?) regarding Anther evolution in animal-pollinated plants.
Thank you so much Dr. Bernhardt, I wrote to Dr. Pyke and will check out the publications suggested. Cheers from Brazil!
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