Question about Intertegular Spans and Foraging Distance
- Dear Nicole Freeman and everyone else,I am starting my Ph.D. sampling here in Brazil and I am also facing the same problem. I would like very much to know if IT spam is really a good surrogate to fly capacity and if there is any place where I can obtain the species (or genera) average IT spam measurements...Nicole, I don't know if it is to ask to much of you, but could you please indicate me the latest papers you have read that argue that IT spam is a good surrogate for bees' flight capacity?Thank you very much!Best regards,
Daniel de Paiva Silva
Graduate Program in Ecology & Evolution
Theoretical Ecology and Synthesis Lab - LETS
Biological Sciences Institute - ICB - UFG
Goiânia - Goiás - Brazil
+55 62 3086.6405 - Home
+55 62 8140.8800 - Cell Phone
+55 62 3521.1373 - Lab
- USDA ID the morphometric measurements used to differentiate Africanized and European honey bees does use wing length as a quick and dirty field measurement. That will work for extremes of both types, but more intermediate sizes require a 23 (can't remember exactly) point measurement. This includes other wing lengths and angles, as well as wax mirror length and width, and number of hamuli on the wings.anita
Yes, I am using wing length as a measure in Vespidae. I have never looked into how this precisely relates to other body measurements such as weight, size of thorax etc. However, the scope of my work has been purely taxonomic, so I have not been interested in fitness parameters, foraging ranges or that sort of thing. It simply serves me as an approximate indicator of body size.
MatthiasOn Fri, Apr 29, 2011 at 9:44 AM, Sam Droege <sdroege@...> wrote:
I believe Matthias Buck often uses wing length in his vespid work as a measure of size.... I would assume that the regression people have looked at this with bees....?
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
There's a certain Slant of light,
That oppresses, like the Heft
Of Cathedral Tunes—
Heavenly Hurt, it gives us—
We can find no scar,
But internal difference,
Where the Meanings, are—
None may teach it—Any—
'Tis the Seal Despair—
An imperial affliction
Sent us of the Air—
When it comes, the Landscape listens—
Shadows—hold their breath—
When it goes, 'tis like the Distance
On the look of Death—
P Bees are not optional.
From: Jack Neff <jlnatctmi@...> To: Sam Droege <sdroege@...>, firstname.lastname@example.org Cc: Nicole Freeman <ndfreeman@...> Date: 04/29/2011 11:05 AM Subject: Re: [beemonitoring] Question about Intertegular Spans and Foraging Distance
All: The best way to measure size is to actually weigh the bees, but that's a bit messy with pinned specimens. Transtegular span works as well as any single morphological measurement when comparing things which vary greatly in size. Its utility decreases when dealing with things of roughly similar size (at least in one dimension) since it assumes everything is essentially the same shape, something that doesn't work well when comparing things like a Chelostoma and an Exomalopsis or anything with any form of allometry. One should also be aware that the folks who have concocted regression analyses leading to the formulas predicting mass from transtegular widths have all come up with slightly different equations based on the different datasets they analyzed.
John L. Neff
Central Texas Melittological Institute
7307 Running Rope
Austin,TX 78731 USA
From: Sam Droege <sdroege@...>
Cc: Nicole Freeman <ndfreeman@...>
Sent: Thu, April 28, 2011 8:26:57 PM
Subject: [beemonitoring] Question about Intertegular Spans and Foraging Distance
Nicole Freeman asked me to past the question below. You can either reply to her directly (Nicole Freeman <ndfreeman@...>) or to the group. I think the topic is of general enough interest that it would be nice to see what the group thinks about using size as a surrogate for territory/foraging range from a trapping location as well as the notion that Intertegular Spans are the best way to measure size of a bee from dried specimens. ... in addition to Nicole's question about whether there is any sort of compilation of such measurements.
My name is Nicole Freeman and I am a Master's student working on a bee
project in Little Rock Arkansas. A point of interest in my study are
possible sources for the bees that I collected last summer in the
Little Rock area.
I plan to identify these by mapping my study sites and placing a
buffer (basically a circle) around each site that would be the
foraging distance for each taxa collected. I have found several
references that indicate that you can estimate foraging distance using
bee size. They also indicate that intertegular spans (ITs) are the
best way to calculate bee size without damaging specimens.
I was wondering if anyone had a quick reference guide to genera IT spans.
Apidae ITs are usual X mm....Megachlidae ITs are usually Y mm and so
on. Thank you so much for your time.
Dr. Matthias Buck
Royal Alberta Museum
Canada, T5N 0M6
Phone: (780) 453-9122