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Hi Angus & All, Jan 24, 2015
In an e-mail of Jan 7, 2002 I estimated maximum flight duration =
based on energy content of tallow and with initial conditions of 3 g =
total weight of which 2 g is tallow to be 126 hours (what I call weight =
would usually now be called mass). In scanning this quickly I noticed =
two typos but whether these introduced error I don't know.=20
At that time Richard dug out an example which showed this simple =
model to considerably underestimate actual endurance--
START OF PASTE\\\\\\\\\\\\\\\
Hi Richard, Elizabeth & All, Jan 9, 2002
<SNIP>
> -- "A typical Blackpoll Warbler at the end of its
> breeding season weighs about 11 grams, equivalent to the weight of 4
> pennies. In preparing for its transatlantic trek, it may accumulate =
enough
> fat reserves to increase its body weight to 21 grams. Given an =
in-flight fat
> consumption rate of 0.6% of its body weight per hour, the bird then =
has
> enough added fuel for approximately 90 hours of flight for a journey =
which,
> under fair conditions, requires about 80 to 90 hours.
This Warbler beats my upper limit, perhaps by being a good weather
forecaster and using rising air currents.
My k equates to a loss of 0.87% of body weight per hour compared to =
0.6%
loss in the Warbler. And when I plug 21 and 11 grams into my model, I =
get 74
hours of flight compared to 90 hours for the Warbler.
Yours truly, Dave Webster, Kentville
END OT PASTE\\\\\\\\\\\\\\\
And the link below, for the Semipalmated Warbler, has 6 days of =
non-stop flight over water (~144 hours).=20
The Albatross beats all of the above of course by staying aloft for =
years without beating a wing. Holding wings out and tilting them and =
tail as required takes energy but still it manages amazingly efficient =
flight.
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: Angus MacLean=20
To: naturens=20
Sent: Saturday, January 24, 2015 9:34 AM
Subject: RE: [NatureNS] Semipalmated Sandpiper migratory route
Can't imagine how thin that little guy was when it arrived at the =
Orinoco Delta!!
Thanks, Eric.
Angus
-------------------------------------------------------------------------=
-----
From: E.Mills@Dal.Ca
To: naturens@chebucto.ns.ca
CC: davidmary3@eastlink.ca
Subject: [NatureNS] Semipalmated Sandpiper migratory route
Date: Sat, 24 Jan 2015 01:31:03 +0000
Courtesy of BCVIBirds, here is a fascinating link about the migratory =
paths of Semipalmated Sandpipers that stage in James Bay: =
http://goo.gl/at0GMZ
I suspect that geolocators have been used with east coast migrants as =
well, but I don't have that information.
Eric
Eric L. Mills
Lower Rose Bay
Lunenburg Co., NS
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5645 / Virus Database: 4273/8984 - Release Date: =
01/23/15
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<DIV><FONT face=3DArial>Hi Angus & All, =
=20
=
=20
Jan 24, 2015</FONT></DIV>
<DIV><FONT face=3DArial> In an e-mail of Jan 7, 2002 I =
estimated=20
maximum flight duration based on energy content of tallow and with =
initial=20
conditions of 3 g total weight of which 2 g is tallow to be 126 hours =
(what I=20
call weight would usually now be called mass). In scanning this =
quickly I=20
noticed two typos but whether these introduced error I don't know. =
</FONT></DIV>
<DIV><FONT face=3DArial> At that time Richard dug out =
an example=20
which showed this simple model to considerably underestimate actual=20
endurance--</FONT></DIV>
<DIV><FONT face=3DArial>START OF PASTE\\\\\\\\\\\\\\\</FONT></DIV>
<DIV>Hi Richard, Elizabeth &=20
All, &nb=
sp; =20
Jan 9, 2002<BR> <FONT=20
face=3DArial><SNIP></FONT><BR>> -- "A typical Blackpoll =
Warbler at=20
the end of its<BR>> breeding season weighs about 11 grams, equivalent =
to the=20
weight of 4<BR>> pennies. In preparing for its transatlantic trek, it =
may=20
accumulate enough<BR>> fat reserves to increase its body weight to 21 =
grams.=20
Given an in-flight fat<BR>> consumption rate of 0.6% of its body =
weight per=20
hour, the bird then has<BR>> enough added fuel for approximately 90 =
hours of=20
flight for a journey which,<BR>> under fair conditions, requires =
about 80 to=20
90 hours.<BR><BR> This Warbler beats my upper limit, =
perhaps=20
by being a good weather<BR>forecaster and using rising air=20
currents.<BR> My k equates to a loss of 0.87% of body =
weight=20
per hour compared to 0.6%<BR>loss in the Warbler. And when I plug 21 and =
11=20
grams into my model, I get 74<BR>hours of flight compared to 90 hours =
for the=20
Warbler.<BR><BR>Yours truly, Dave Webster, Kentville<BR><FONT =
face=3DArial>END OT=20
PASTE\\\\\\\\\\\\\\\</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> And the link below, for the=20
Semipalmated Warbler, has 6 days of non-stop flight over water (~144 =
hours).=20
</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> The Albatross beats all of =
the above of=20
course by staying aloft for years without beating a wing. Holding wings =
out and=20
tilting them and tail as required takes energy but still it manages =
amazingly=20
efficient fl