95Re: [beemonitoring] Recently Introduced Bees - A Potentially Large and Unstudied Problem
- May 17, 2007Sam 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:
> 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 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
> 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
Dept. of Biology
Bryn Mawr College
Bryn Mawr, PA 19010
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