This blog is meant to report on small experimental trials, testing various facets of trapping bees and pollinators attracted to color based traps....bowl, pan, vane, moericke, etc. It is also a place where observations and thoughts regarding their effectiveness or ineffectiveness can be posted. Comments are encouraged.

Tuesday, April 6, 2010

4 April 2010 - Bowl Size and Position

Location: Hardesty, MD
Conditions:  Sunny, 70's
Start: 9:00 a.m. April 4
End: 6:00 p.m. April 4
Habitat:Mature mixed woodlands with Spring Beauty understory
Bees: Andrena, Osmia, Lasioglossum, Ceratina, Nomada
Experiment: 3.25 ounce white solo cups  were alternated with a completely filled 16 ounce Walmart store plastic drink cup that was red on the outside and white on the inside and the same Walmart Drinking cup buried so that it stood up about the same distance as the 3.25 ounce solo cup, and then another Walmart drinking cup that was cut down to the same height (it was about the same diameter) as the 3.25 ounce solor.  Bowls were spaced 5 m apart and filled with soapy water (dawn dishwashing detergent and tap water). 


1 2 3 4 5 6 7 8 9 10 Mean
16 oz. Buried 0 1 0 1 5 2 9 2 0 4 2.40
3.25 Oz. 7 0 1 2 2 5 n 7 6 4 3.78
Cut 16 oz. 1 1 2 0 0 8 6 5 2 0 2.50
16 oz. 1 1 1 3 2 2 10 0 4 1 2.50

Note that all the Walmart bowls had essentially the same average catch, but the solo bowl bowls was higher by a bit over a bee per bowl....

That said, a one-way ANOVA indicated that such a difference wasn't significantly different from the other means (f=0.5401, P=0.6819), a square root transformation for count data didn't improve anything.

Its possible that the red on the outside had a slight impact, but then again, most bees cannot see red and this was a bright red.

So, not a lot of evidence for an effect of cup size or height above the ground, but perhaps a difference between bowls types...though the evidence is weak.

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With Natural History there is no need to go to the moon or Madagascar; there is more to find in your woodlot than in our entire solar system.