Table 1.
Iowa cornfields surveyed for pollinators.
Fig 1.
Bee bowl stand used to sample insect pollinators in cornfields, raised to maximum height of 2.74 m.
Image was taken in early June prior to sampling to illustrate how traps function; traps were obscured by the corn plants once sampling began.
Fig 2.
A ‘bowl-unit’ at ear height contained one bowl of each color (yellow, white, and blue) made from three hangers attached to a wall shelf bracket.
Fig 3.
Diagram depicting the location within a cornfield where bees were sampled; circles represent location of traps.
Table 2.
Abundance of pollinator by taxa and trapping method for 2012 (2013).
Table 3.
MANOVA fit statistics height, color, and farm on bee and fly abundances in bee bowls deployed in Iowa cornfields.
Table 4.
ANOVA fit statistics for the effects of height, color, and farm separately for bee and fly abundance from bee bowl deployed in Iowan cornfields.
Table 5.
Tukey Honest significant differences for varying levels of height and color for bee and fly abundance from bee bowls deployed in Iowan cornfields.
Fig 4.
Species accumulation curves generated from samples collected from bee bowls in 2012 and 2013.
Curves represent the accumulation of both bee and fly species. The black curve corresponds to traps at tassel height; the blue curve corresponds to traps at ear height; and the red curve corresponds to traps at ground height. The dashed lines about the curves represent the 95% confidence interval.
Fig 5.
Species accumulation curves generated from samples collected from bee bowls in 2012 and 2013.
Curves represent the accumulation of both bee and fly species. The black curve corresponds to samples collected from blue bowls; the medium grey curve corresponds to samples collected from yellow bowls and the light grey curve corresponds to samples collected from white bowls. The dashed lines about each curve represents the 95% confidence interval.