While I didn't feel this was complete enough to share, the electrons zipping around in cyberspace have aliened thus giving me the impetus...
There are three graphs [blue, yellow, white] with % reflectance on the Y-axis and wavelength on the X-axis.
Notes on the types of bowls tested.
1 Year old bowls - 45+ days in full sun. Made by Sam's technicians a few years ago using special paint on White Plastic Solo cups.
New translucent Plastic Solo cups with Krylon "fusion" white paint, Krylon Florescent Yellow and Krylon Florescent Blue. % Reflectance was taken on new bowls with soapy water and dry.
The green lines on the graphs represent the " max
values at 348nm (ultraviolet receptor), 436nm (blue receptor)
572nm (green receptor)" for Osmia rufa by Menzel et.al
Lines and points on the graphs are as follows:
Red:New bowls filled with soapy water
Blue:New bowls left dry
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On Fri, Apr 2, 2010 at 9:45 AM, Sam Droege <sdroege@...>
We have continued to test out long-term traps using glycol
and one possibility was to use Styrofoam cups (Cheap, environmentally a
bit greener). Well after noticing that catch seemed subpar we tested
cups vs our small bowls and the small bowls clearly caught more....we also
tested for a glycol/ soapy water effect and found none. My first
thought was that the height of the cup was the problem, however, we just
finished a test today with some surprising results (to me). We sliced
the Styrofoam cups down to the same size (Thanks for the idea Alex Surcica)
and put them into the experiment below....results are very clear, but the
interpretation is a bit fuzzy. Bottomline...don't use Styrofoam.
Location: Beltsville, MD
Start: Noon April 1
End: 9:30 a.m. April 2
Habitat: Bottomland Mixed forest with many spring beauties (Claytonia)
Bees: Osmia, Andrena, Nomada
Experiment: 21 bowls each of 3.25 ounce white solo brand bowls and
similar sized cut down Styrofoam cups, the two types were alternated in
a transect through the woods and placed 5 m apart.
Results below are Styrofoam in the left column and solo in the right column.
They are presented as pairs, but in reality they are simply adjacent to
one another (5m apart) in the transect. Numbers are total number of bees.
Helping on the this experiment were Molly Passacantando and Lisa Guide
Results are extremely clear. Styrofoam captures are much less. Totals are
much lower and in adjacent bowls capture in Styrofoam is always lower.
Not sure why, both are bright white....possibly bees can climb out of Styrofoam
more easily, but no sign of soggy bees on or near the cups.
Sam Droege sdroege@...
w 301-497-5840 h 301-390-7759 fax 301-497-5624
USGS Patuxent Wildlife Research Center
BARC-EAST, BLDG 308, RM 124 10300 Balt. Ave., Beltsville, MD 20705
Some Glad Morning
One day, something very old
happened again. The green
came back to the branches,
settling like leafy birds
on the highest twigs;
the ground broke open
as dark as coffee beans.
The clouds took up their
positions in the deep stadium
of the sky, gloving the
bright orb of the sun
before they pitched it
over the horizon.
It was as good as ever:
the air was filled
with the scent of lilac
s and cherry blossoms
sounded their long
whistle down the track
It was some glad morning.
- Joyce Sutphen
Bees are not optional.