Hi All,
I’ll just piggy-back on the great responses posted already with not much to
add. As Abbie points out, take a look at Paruk et al.’s paper on RMR—some
really good data there. A pdf is available on ResearchGate.
I agree with Abbie on NSHR being quite lithe (svelte?) through the winter
months. In March on their wintering grounds, I have handled a couple that get
into the 3 condition index (0-5; most keep good pectroralis mass) (fattest
birds were over 1 to 2 [on Kaiser scale 0-8] but with no discernable fat in the
furcular region or over belly). And this is right near vernal migration
(heading out in late March to mid April). I think it is pretty location
specific. Premigratory fattening a tad, in other words.
Piloerection? Yes, certainly. And on the roost (and while hunting when
ambient temperatures are cold) they sit on their feet/legs a lot making banded
birds difficult to identify.
Here is the citation and link for the Birds of the World account.
Paruk, J. D., T. J. Cade, E. C. Atkinson, P. Pyle, and M. A. Patten. 2020.
Northern Shrike (Lanius borealis), version 1.0. In Birds of the World (S. M.
Billerman, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.
https://doi.org/10.2173/bow.norshr4.01
Happy shriking!
Eric
Eric C. Atkinson
Associate Professor & Biology Dept. Coordinator
NWC INBRE Project Lead
WY INBRE State Steering Committee
Research Associate at Northern Rockies Conservation Cooperative
http://nrccooperative.org/
Northwest College &
231 W. 6th Street Coon’s Age Farm
Science and Mathematics 254 99 Lovers Lane
Powell, WY 82435 Belfry, MT 59008
307-754-6018 45.11697°N 108.99556°W
Eric.atkinson@xxxxxxx<mailto:Eric.atkinson@xxxxxxx>
Working to become native to where we live.
From: eloshwg-bounce@xxxxxxxxxxxxx <eloshwg-bounce@xxxxxxxxxxxxx> on behalf of
Abbie Valine <abbiegrace97@xxxxxxxxx>
Date: Thursday, February 3, 2022 at 9:09 AM
To: eloshwg@xxxxxxxxxxxxx <eloshwg@xxxxxxxxxxxxx>
Cc: Joe Riederer <riedererjt@xxxxxxxxx>
Subject: [eloshwg] Re: Northern Shrike question
Joe,
I work with Northern Shrikes. Adding to what Chris said regarding the fat
question, virtually none of the shrikes I’ve banded have had more than a trace
amount of stored body fat, no matter the temperature or time of day. Most of my
birds seem to score a 0 (none) or 1 (trace) on the fat scale whether it’s -20
or +20F.
Paruk et al (2015) have a paper on “resting metabolic rates of adult Northern
Shrikes wintering in southern Wisconsin” which might be of help to you if you
haven’t seen it already.
Abbie Valine
Duluth, MN
On Feb 3, 2022, at 09:30, Amy Chabot <achabot@xxxxxxxxxxxxxx> wrote:
Hello Joe,
Those are some very interesting questions! And I currently don't have the
answers. I've sent this message to the Loggerhead Shrike Working Group, as some
folks work with Northern Shrike. Hopefully someone can help you out.
Amy
[cid:WC20220203152834.14042A@lionsafari.com]
From: Joe Riederer <riedererjt@xxxxxxxxx>
To: achabot@xxxxxxxxxxxxxx
Date: Tue, 1 Feb 2022 16:29:11 -0600
Subject: Northern Shrike question
I'm writing a series of blog posts highlighting how different animals survive
the winter. My target audience is the middle school science classroom and
interested adults. Currently, I am working on the Northern Shrike. Last week it
was -18°F when I saw my first Northern Shrike of the season.
I understand that you work with Loggerhead Shrikes, but can you direct me to
any information about Northern Shrikes? I’m struggling to locate any
information about how they survive the cold of winter (other than their hunting
behavior). Specifically, I’m trying to answer these questions:
* Does the Northern Shirkes use piloerection to increase the insulation
value of their feather?
* Do shrikes enter nightly torpor to conserve energy?
* Do shrikes increase their body fat before the onset of cold weather?
* Do shrikes use countercurrent heat exchange to avoid losing heat to their
unfeathered feet?
The blog is already being used in a few classrooms. You can see it at
https://wildlifeinwinter.com/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwildlifeinwinter.com%2F&data=04%7C01%7Ceric.atkinson%40nwc.edu%7C59168996b076483d30ec08d9e72f7f1a%7C9764be64829e46f29cef87d913c6e344%7C0%7C0%7C637795013462120524%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=v7sR2mvKxICyKspe%2FOYV2h3z8uOzQUGD%2FzMPRJMeGiI%3D&reserved=0>.
Thanks for any help you can provide.
Joe Riederer
--
Joe Riederer Wisconsin Rapids, WI (715) 323-1362
Web Site: Big Bluestem
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