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Reproduction in polemonium foliosissimum competition for pollinators

Reproduction in polemonium foliosissimum competition for pollinators

Ecology (Washington D C) 61(3): 497-501

The flowering season of P. foliosissimum Gray (Polemoniaceae) can be divided into 2 distinct periods. In the 1st, the bee [Bombus bifarius and B. flavifrons]: flower ratio is relatively high and large numbers of seeds per ovary are set. No correlation exists between the pollinator visitation rate to flowers and seed-set. In the 2nd period the bee:flower ratio and seed-set are lower and a very strong correlation exists between pollinator service and seed-set. Pollinators are limiting resources during this portion of the season and those individual plants which can best attract pollinators have a strong selective advantage at this time. Intraspecific exploitation competition for pollinator service might be occurring during this portion of the flowering season.

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