[TN-Bird] Re: Loggerhead Shrike (Robertson Co.)
- From: Dthomp2669@xxxxxxx
- To: tonylance@xxxxxxx, tn-bird@xxxxxxxxxxxxx
- Date: Sun, 18 Oct 2009 16:21:49 EDT
When I was a little girl growing up in the late 1930's and early 1940's, we
had a large farm just north of Maitland, Florida. We had a fantastic milk
cow, and had about 35 acres fenced for her pasture. Loggerhead shrikes
were common around our cowshed and nested in our pasture which had lots of
grass and scrubland trees and shrubs. Up here in Tennessee, I've had these
birds in Bell's Bend (Davidson County) not far from a silo on a farm and
others near Adairsville, KY in Robertson County,TN where there are cattle.
Dee Thompson
Nashville, TN
In a message dated 10/18/2009 1:08:16 P.M. Central Daylight Time,
tonylance@xxxxxxx writes:
Sorry to bombard the list with repeated posts, but some of you might be
interested in this (and others of you probably already knew it). Out of
curiosity about the possible association between shrikes and cattle I did a
quick Google search and found the abstract to an interesting paper. It appears
that at least in Austria shrikes are found most often on grazed farmland.
It says:
"In 1997 and 1998, we investigated the habitat use of Red-backed Shrikes
breeding on farmland in Carinthia, southern Austria. We devised an objective
census technique to obtain relative measures of shrike abundance and
habitat coverage along 35 1 km transect belts, 60 m in width, positioned
randomly throughout an area of 100 1 km squares. Shrike abundance was related
to
habitat variables by means of general linear models. Bivariate models
suggested that Red-backed Shrikes were positively associated with grassland
grazed by livestock, fence-lines and scattered trees and shrubs, but
negatively
associated with arable land and grassland that was not grazed. A model
constructed with the help of forward selection indicated that shrike abundance
was most strongly associated with a mixture of grazed grassland and scrub.
Shrike abundance increased with grazed grassland cover. When the cover of
grazed grassland was kept constant, shrike abundance increased with scrub
cover up to betwee
n 10 % and 15 % cover, and declined thereafter. We tested the validity of
the model using data from a further 20 transects, collected in 1998. The
number of shrikes predicted under the model was significantly positively
correlated with the number of shrikes recorded."
http://www.springerlink.com/content/9l355162537317l5/
Tony Lance
Springfield, TN
On Sunday, October 18, 2009, at 01:32PM, "Tony Lance" <tonylance@xxxxxxx>
wrote:
>It occurred to me after the previous post in which I mentioned Loggerhead
Shrikes nesting on our neighbor's dairy farm in years past that the last
two times I've seen shrikes in this area have been on or very near dairy
farms. The pair in Logan Co., Ky. were on a dairy, and the one today was
within sight of one. I imagine it's a coincidence, but I'm curious if anyone
else has noticed an association with dairies or cattle.
>
>Tony Lance
>Springfield, TN
>
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=================NOTES TO SUBSCRIBER=====================
The TN-Bird Net requires you to SIGN YOUR MESSAGE with
first and last name, CITY (TOWN) and state abbreviation.
You are also required to list the COUNTY in which the birds
you report were seen. The actual DATE OF OBSERVATION should
appear in the first paragraph.
_____________________________________________________________
To post to this mailing list, simply send email to:
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_____________________________________________________________
To unsubscribe, send email to:
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______________________________________________________________
TN-Bird Net is owned by the Tennessee Ornithological Society
Neither the society(TOS) nor its moderator(s)
endorse the views or opinions expressed
by the members of this discussion group.
Moderator: Wallace Coffey, Bristol, TN
wallace@xxxxxxxxxxxxxxxxxxx
------------------------------
Assistant Moderator Andy Jones
Cleveland, OH
-------------------------------
Assistant Moderator Dave Worley
Rosedale, VA
__________________________________________________________
Visit the Tennessee Ornithological Society
web site at http://www.tnbirds.org
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