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Rowcover for assessing nesting density?

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  • Kuhn,Bernadette
    Dear Listserve- I am looking for any tips on sampling nesting density of ground nesting bees in native grasslands. I have read the methods described by Kim et
    Message 1 of 4 , Mar 31, 2013

      Dear Listserve-


      I am looking for any tips on sampling nesting density of ground nesting bees in native grasslands. I have read the methods described by Kim et al. 2006* which describe using floating rowcover. The authors covered patches of ground with rowcover at night and captured bees that emerged from nests in the morning. I am considering using similar methods, maybe paired with pan traps beneath the rowcover. Has anyone tried rowcover with or without pan traps to measure nesting density? Perhaps there are other methods I have not stumbled across?  Any input is appreciated.


      *Reference: Kim, J., N. Williams, C. Kremen. 2006. Effects of Cultivation and Proximity to Natural Habitat on Ground-Nesting Native Bees in California Sunflower Fields. Journal of the Kansas Entomological Society, 79 (4): 309-320.



      Bernadette Kuhn



      Colorado Natural Heritage Program

      259 General Services Building

      1475 Campus Delivery

      Fort Collins, CO 80523-1474

      phone (office): 970 491 1416

      phone (cell): 785 764 2948

      email: bernadette.kuhn@...




      From: beemonitoring@yahoogroups.com [mailto:beemonitoring@yahoogroups.com] On Behalf Of Anita M. Collins
      Sent: Sunday, March 31, 2013 6:59 PM
      To: lar322@...; beemonitoring@yahoogroups.com
      Subject: Re: [beemonitoring] Andrena commoda mystery



      Hi Laura,


      I've the same experience.  Sampling at Lehigh Gap Nature Center in Slatington, PA, we had 150 Lassioglossum of primarily 3 species in about 4 bowls of a 12 bowl transect, on one date.  I planned to resamples in the same area the following year, but it got upset by a major building project for the Center.  My explaination was that there were a lot of nests in that area, a rocky/gravely section of hillside.  If you want the exact species, I'll dig it out of the data set.  What a pain to pin all those tiny bees and separate them by abdominal hair distribution, expecially as I was really new at this.  But I did it. 


      Anita Collins




      If we knew what we were doing,! it wouldn't be called research.
      Albert Einstein


      On 03/28/13, Laura Russo<lar322@...> wrote:



      Dear listserve,

      I have a bit of a bee mystery that I thought someone might have insight into. 

      I sampled for bees in an agroecosystem for two summers, sampling every other week with pan traps at 30 locations (spatially separated) around the fields.  The pan traps were yellow and large.  There is one day that stands out because, in one pan at one site on June 25, 2010, we captured 54 individual specimens of Andrena commoda.  (The identification was confirmed by an expert.)

      In two years of sampling, we! only ever caught 5 other individuals of that species.

      Does any one have any intuition as to why we would catch so many in just one pan on just one day?  What caused them to commit mass suicide in the pan, and where did they all come from?  Why June 25th, and why not anywhere else, or in the other year?

      Any insights you might have would be greatly appreciated.


      PhD Candidate
      Intercollege Graduate Degree Program in Ecology
      Biology Department
      Pennsylvania State University
      University Park, PA 16802

      office: 415 Mueller Lab
      phone: 814-865-7912

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