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95Re: [beemonitoring] Recently Introduced Bees - A Potentially Large and Unstudied Problem

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  • Neal Williams
    May 17, 2007
      Sam et al.

      I believe that we are seeing them here in Philadelphia region too. I
      have two reports from people of large number of bees in rafter area of
      barns-They are OSmia for sure, but I need to key the specimens.
      Certainly they are horned.

      Neal Williams --Bryn Mawr College

      Sam Droege wrote:
      > All:
      > I am having some trepidations about 3 species of recently introduced
      > bees whose populations appear to be skyrocketing.
      > Osmia cornifrons
      > Osmia taurus
      > Anthophora plumipes
      > The epicenters for these 3 species appear to be the D.C area with O.
      > cornifrons, O. taurus having spread widely throughout VA, WV at least
      > and A. plumipes still appearing largely circumscribed to the D.C. area.
      > All 3 are now abundant enough that I get numerous emails and calls
      > about their presence and I find them abundant, at times, in our trapping.
      > Here are some conservation issues.
      > The Osmia species both seem to have very similar habits to the native
      > O. lignaria, size is similar and come from the same subgenus. There
      > are now so common as I can't believe there isn't some competition
      > going on, for hole sites, pollen, etc. Additionally, a recently
      > discovered parasite of these species has been found in the region and
      > may also adversely affect native Osmians. Orchardists now spread O.
      > cornifrons and perhaps the look alike O. taurus around, but wild
      > populations appear to far outnumber managed trap nests.
      > This group is very easy to study as all 3 readily take to trap nests.
      > Thus it would be easy to look at survivorship, fecundity, parasitism
      > rates over large regions, where they are established, becoming
      > established, and where they have yet to arrive.
      > A. plumipes is a different bird and may or may not compete with native
      > species, but it is becoming very common in the D.C. are and it would
      > be very interesting to run parallel studies of the movement,
      > fecundity, etc. of this spring species compared to that of the Osmians.
      > I won't have time to pursue this, but wanted to get the idea out in
      > the ether. Given that 7 or so species of exotic bees have been
      > discovered this decade already, compared to an average of 1 per decade
      > previously, I am afraid introduced species are going to become more of
      > an issue in the future.
      > sam
      > Sam Droege Sam_Droege@...
      > 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
      > Ozymandias
      > I met a traveller from an antique land
      > Who said: Two vast and trunkless legs of stone
      > Stand in the desert ... Near them, on the sand,a
      > Half sunk, a shattered visage lies, whose frown,
      > And wrinkled lip, and sneer of cold command,
      > Tell that its sculptor well those passions read
      > Which yet survive, stamped on these lifeless things,
      > The hand that mocked them, and the heart that fed:
      > And on the pedestal these words appear:
      > "My name is Ozymandias, king of kings:
      > Look on my works ye mighty and despair!"
      > Nothing beside remains. Round the decay
      > Of that colossal wreck, boundless and bare
      > The lone and level sands stretch far away.
      > -- Percy Bysshe Shelley

      Neal Williams
      Dept. of Biology
      Bryn Mawr College
      Bryn Mawr, PA 19010

      Tel: 610-526-5091
      Fax: 610-526-5086
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