Re: [beemonitoring] monitoring bee phenology with trap nests
Your comments got me thinking
How widespread is parsivoltinism among megachilids?
For those of us doing this kind of trap nesting, is there any easy
(non-x-ray) way to distinguish dead cocoons from parsivoltine species
(besides observing them over several seasons)?
Thanks for your thoughts!
On 9/2/08 11:36 AM, "Cane, Jim" <Jim.Cane@...> wrote:
Sam- I too rear trap nests through to adulthood, then take one of the
early-emerging males to sacrifice for the ID, leaving me with the other
males and all the females to fly. If you have Osmia, they overwinter as
adults anyway, which is handy, as you can dissect them right out of the
cocoon. For most other genera, your reward will be delayed, but they can
be simply wintered at outdoor temps. If you want them to then nest, leave
them at ambient temps to emerge naturally in their season of flight. If
all will be sacrificed, then most will have satisfied their chill
requirements by spring and can be brought indoors to emerge then. The gel
caps just help to keep everybody straight and avoid the need for
individual containment of nest straws/sticks. Also, you can write on the
gel caps with Sharpies for whatever ID code system you are using. You
could just as easily use vials, they are simply more bulky, or as I think
about it, crimped pieces of clear plastic straws.
James H. Cane
USDA-ARS Bee Biology and Systematics Lab
Utah State University, Logan, UT 84322 USA
tel: 435-797-3879 FAX: 435-797-0461
web page: www.ars.usda.gov/npa/beelab
Pollinator Outreach Coordinator
The Xerces Society
PO Box 8833 Madison, WI, 53708 USA
Tel: 608-628-4951 Fax: 503-233-6794
The Xerces Society is an international nonprofit organization that
protects wildlife through the conservation of invertebrates and their
habitat. To join the Society, make a contribution, or read about our work,
please visit www.xerces.org.