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Comparison of Bowl Traps With and Without Baffles

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  • Sam Droege
    All, we are wrapping up a number of student tests from last year....here is the result of one small study... You can see the results of these another test at
    Message 1 of 1 , Mar 4, 2011

      All, we are wrapping up a number of student tests from last year....here is the result of one small study...

      You can see the results of these another test at the blogspot:
      http://glycolbee.blogspot.com/



      Test =  Paired comparisons of large 1 liter white soapy water traps with and without a clear Lucite baffle that projected above the traps by approximately 20cm

      Date =Summer and Fall of 2010

      Locations = Fields and Lawns in Prince George's County Maryland

      Number of Tests = 22

      Definition of Test = Paired traps (with and without baffles) spaced 5m apart

      Summary = Don't put baffles in your bowl traps

       

      Results

       

       

                 With Baffle       Without Baffle

      Mean:      0.86                 1.91

      Median:   0.5                   2.0

       

      SIGN TEST

      r:          12        p(same):           0.03516

       

      WILCOXON TEST

      W:       94

      z:         1.954   p(same):           0.050742

      Monte Carlo    p(same):           0.05453

       

      Interpretation of Results:  While numbers of bees in each traps was rather low (mid-summer is traditionally a low bee capture time here) the results clearly demonstrate that putting in a baffle decreases the overall catch of bees by about half.

      Interestingly, we ran this experiment thinking the opposite...that baffles would increase the catch as bees as bees that passed low over the traps to investigate would run into the clear panels.  However, it may be the case that these panels, as they sat in the sun, were obvious to bees and they steered clear of them.  This does point out that bees are impacted by the architecture of a trap's design.

      sam


                                                     
      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
      Http://www.pwrc.usgs.gov

      The Early Morning

      The moon on the one hand, the dawn on the other:
      The moon is my sister, the dawn is my brother.
      The moon on my left hand and the dawn on my right.
      My brother, good morning: my sister good night.


                - Hilaire Belloc.




      P Bees are not optional.
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