>Recent work on pollen quality

Also: Pollen amino acids and flower specialisation in solitary bees, 

Christiane Weiner,et.al, Apidologie 41(2010) 476-487

The study includes a break out for plant species and total concentrations
of free and protein-bound amino acids along with the % of essential amino acids. 

"Most plant species investigated contained the full spectrum of essential
amino acides, albeit some in extremely small quantities."....

"Adaptation to a certain pollen source may be associated with a cost: a 
decreased capability to digest other pollen types." Such costs are known
to occur in host-specific herbivores (Strauss and Zangerl, 2002) and were 
recently hypothesised for bees as well"

Kathy Kellison

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