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--_000_D828AF18F9CABA4AADDA9D0F9808ED76BAD0732F2Fbsc2008bsceoc_
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Hi Dave,
The pattern differs slightly from roost to roost but, yes, we generally see=
a spring peak near the end of May and a decline in numbers at central roos=
ts until late July, when there is a second peak. This reflects the fact tha=
t many pairs spread out from a central roost to find and nest in smaller ne=
sting chimneys in June and July. At some roost sites the spring peak is hi=
gher than the fall peak, and at others, the opposite occurs. I suppose it d=
epends on where the particular roost site is located along the birds' trave=
l route in spring and late summer. We don't have a lot of data about age co=
mposition of roosting birds over the season, but would expect a trickle of =
birds as some pairs return from failed nesting attempts, as well as an infl=
ux of young, just-fledged birds in late summer. Interestingly, some major r=
oost chimneys in southern Ontario experience two "mini peaks" in late summe=
r, comprising local breeders and fledged young, followed by those swifts pa=
ssing through southward on their way from breeding sites further north. Las=
tly, at many roosts, there remain a number of non-breeding swifts between =
the two peaks.
Hope that answers it but Jim, or other long-time observers, may have more t=
o add on this subject.
All the best,
Ally
From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca] =
On Behalf Of David & Alison Webster
Sent: Tuesday, May 29, 2012 4:04 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] chimney swifts summary for 2012 to date
Hi Jim & All, May 29, 2012
In the course of a typical season, does total daily traffic at these co=
mmunal roosts, decline to a minimum during the breeding season and then ris=
e to a second higher maximum ?
Yt, Dave Webster, Kentville
----- Original Message -----
From: James W. Wolford<mailto:jimwolford@eastlink.ca>
To: NatureNS<mailto:naturens@chebucto.ns.ca>
Cc: Chris Field<mailto:field@mathstat.dal.ca>
Sent: Tuesday, May 29, 2012 12:06 PM
Subject: [NatureNS] chimney swifts summary for 2012 to date
This is a work in progress, and I invite corrections or additions. Please =
help.
2012 CHIMNEY SWIFTS SUMMARY (N.S.)
--_000_D828AF18F9CABA4AADDA9D0F9808ED76BAD0732F2Fbsc2008bsceoc_
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</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite lang=3DEN-US=
link=3Dblue vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>=
<span style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1=
F497D'>Hi Dave,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'fo=
nt-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> =
;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font=
-family:"Calibri","sans-serif";color:#1F497D'>The pattern differs slightly =
from roost to roost but, yes, we generally see a spring peak near the end o=
f May and a decline in numbers at central roosts until late July, when ther=
e is a second peak. This reflects the fact that many pairs spread out from =
a central roost to find and nest in smaller nesting chimneys in June and Ju=
ly. At some roost sites the spring peak is higher than the fall peak,=
and at others, the opposite occurs. I suppose it depends on where the part=
icular roost site is located along the birds’ travel route in spring =
and late summer. We don’t have a lot of data about age composition of=
roosting birds over the season, but would expect a trickle of birds as som=
e pairs return from failed nesting attempts, as well as an influx of young,=
just-fledged birds in late summer. Interestingly, some major roost chimney=
s in southern Ontario experience two “mini peaks” in late summe=
r, comprising local breeders and fledged young, followed by those swifts pa=
ssing through southward on their way from breeding sites further north. Las=
tly, at many roosts, there remain a number of non-breeding swifts bet=
ween the two peaks.<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p=
> </o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0p=
t;font-family:"Calibri","sans-serif";color:#1F497D'>Hope that answers it bu=
t Jim, or other long-time observers, may have more to add on this subject.<=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;f=
ont-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></=
p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri=
","sans-serif";color:#1F497D'>All the best,<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'=
>Ally<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11=
.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></s=
pan></p><div><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;paddi=
ng:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'font-size:10.0=
pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style=3D'font-s=
ize:10.0pt;font-family:"Tahoma","sans-serif"'> naturens-owner@chebucto.ns.c=
a [mailto:naturens-owner@chebucto.ns.ca] <b>On Behalf Of </b>David & Al=
ison Webster<br><b>Sent:</b> Tuesday, May 29, 2012 4:04 PM<br><b>To:</b> na=
turens@chebucto.ns.ca<br><b>Subject:</b> Re: [NatureNS] chimney swifts summ=
ary for 2012 to date<o:p></o:p></span></p></div></div><p class=3DMsoNormal>=
<o:p> </o:p></p><div><p class=3DMsoNormal><span style=3D'font-size:10.=
0pt'>Hi Jim & All, &nb=
sp; May 29, 2012</span><o:p></o:p></p></div><div><p clas=
s=3DMsoNormal><span style=3D'font-size:10.0pt'> In the co=
urse of a typical season, does total daily traffic at these communal roosts=
, decline to a minimum during the breeding season and then rise to a second=
higher maximum ? </span><o:p></o:p></p></div><div><p class=3DMsoNormal><sp=
an style=3D'font-size:10.0pt'>Yt, Dave Webster, Kentville</span><o:p></o:p>=
</p></div><blockquote style=3D'border:none;border-left:solid black 1.5pt;pa=
dding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0i=
n;margin-bottom:5.0pt'><div><p class=3DMsoNormal><span style=3D'font-size:1=
0.0pt;font-family:"Arial","sans-serif"'>----- Original Message ----- <o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal style=3D'background:#E4E4E4=
'><b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>From=
:</span></b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif=
"'> <a href=3D"mailto:jimwolford@eastlink.ca" title=3D"jimwolford@eastlink.=
ca">James W. Wolford</a> <o:p></o:p></span></p></div><div><p class=3DMsoNor=
mal><b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>To=
:</span></b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif=
"'> <a href=3D"mailto:naturens@chebucto.ns.ca" title=3D"naturens@chebucto.n=
s.ca">NatureNS</a> <o:p></o:p></span></p></div><div><p class=3DMsoNormal><b=
><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Cc:</spa=
n></b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> <a=
href=3D"mailto:field@mathstat.dal.ca" title=3D"field@mathstat.dal.ca">Chri=
s Field</a> <o:p></o:p></span></p></div><div><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Sent:</span></b=
><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> Tuesday=
, May 29, 2012 12:06 PM<o:p></o:p></span></p></div><div><p class=3DMsoNorma=
l><b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Subj=
ect:</span></b><span style=3D'font-size:10.0pt;font-family:"Arial","sans-se=
rif"'> [NatureNS] chimney swifts summary for 2012 to date<o:p></o:p></span>=
</p></div><div><p class=3DMsoNormal><o:p> </o:p></p></div><p class=3DM=
soNormal>This is a work in progress, and I invite corrections or additions.=
Please help. <o:p></o:p></p><div><p class=3DMsoNormal><o:p>&n=
bsp;</o:p></p></div><div><p class=3DMsoNormal align=3Dcenter style=3D'text-=
align:center'><b><span style=3D'font-size:9.0pt;font-family:"Helvetica","sa=
ns-serif"'>2012 CHIMNEY SWIFTS SUMMARY (N.S.)</span></b><o:p></o:p></p><p c=
lass=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span style=3D'=
font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></sp=
an></p><p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>&nbs=
p;<o:p></o:p></p></div></blockquote></div></body></html>=
--_000_D828AF18F9CABA4AADDA9D0F9808ED76BAD0732F2Fbsc2008bsceoc_--
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