Pollination services provided by bees in pumpkin fields supplemented with either Apis mellifera or Bombus impatiens or not supplemented.

PLoS One · 2013 · PMC3722171 · PMID 23894544

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an obvious trendno p-value reported

Although our sample size is low (N = 2) there was an obvious trend towards greater visitation frequency by B. impatiens in warmer years.

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