next message in archive
no next message in thread
previous message in archive
Index of Subjects
--Boundary_(ID_RrA5h5MSv+NvjjaNr6ip+g)
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Hi Bob and Angela,
The diurnal cycle certainly triggers the start of northward migration in
many neotropical migrants. However temperature thermoclines play a role
in how fast the northern advancement takes place for a number of
species. They undoubtedly also play a role in how far south
non-neotropical species go in the fall/winter as well.
Such a small sample size of observations (4) over such a short time
frame (2009-2010) can not really be used to indicate what is going on
though. Using data from Journey North and from NS Birds, a different
view exists. In 2000 there was a sighting reported to Journey North
April 18 but it wasn't until May 6 that any more sightings were sent in
(15 sightings were reported between May 6-8). The ones reported to NSBS
in that year were in a similar range, most showing up the start of the
second week in May. In 2004 the majority of sightings for Journey North
and NS Birds come from the first week in May range. Using the majority
of sightings for 2000 or 2004 as a base, sightings are much earlier last
year than then.
Is this apparent migration shift an example of a historical cycle that
has been repeating for hundreds of years, is it a long-term trend
indicating a change from what is to be expected or is it simply
randomness? For myself I feel that climate change has an effect on
birds and their migration. If someone has the time, going back through
NS Birds past issues for hummingbird sightings for the last 40 years
might prove insightful.
As Hans has pointed out, this year's warm weather appears to have
allowed Ruby-throated Hummingbirds to appear much further north than
this time last year. However, the weather has gotten colder again and
this may delay their appearance in NS to a point where they may show up
in the same range of dates that they did last year.
I'm looking forward to hearing when the majority of hummers are reported
this year.
All the best,
Lance
====================
Lance Laviolette
Glen Robertson, Ont.
====================
________________________________
From: naturens-owner@chebucto.ns.ca
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Bob McDonald
Sent: Friday, April 09, 2010 2:01 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] earliest hummingbird
If you look carefully at the maps for 2009 and for 2010, so far, there
is not really a significant difference as far as Canada is concerned.
Last year at this time, there had been 2 reports in Canada (s. Ontario),
while this year there have been 4 reports. Is this significant? I
don't think so. As far as NS is concerned, there are no reports yet for
2010 while in 2009 the first reports came on April 20, 22, 22, 23.
April 20 is only 11 days away.
Most migrating birds time their migration according to the diurnal cycle
(the length of the day) so just because we are experiencing late
spring-like weather here does not necessarily mean birds will arrive
here early. Those outliers which do arrive "early", like the
Ruby-crowned Kinglet that Suzanne and I saw and heard last Tuesday, may
be more readily noticed since it was singing in the warm sunshine.
Overall, I am sceptical that our unseasonably warm weather here has any
effect on the arrival timing of migrating birds.
Cheers,
Bob McDonald
Halifax
----- Original Message -----
From: Hans Toom <mailto:Htoom@hfx.eastlink.ca>
To: naturens@chebucto.ns.ca
Sent: Friday, April 09, 2010 12:22 PM
Subject: Re: [NatureNS] earliest hummingbird
Hi all,
The Ruby-throated Hummingbirds are about 1400 kilometres further
north this year than last year. Last year they were crossing the North
Carolina border in early April while this year they are probably in
Maine already.
Hans
----- Original Message -----
From: Angela Joudrey* <mailto:aljoudrey@eastlink.ca>
To: naturens@chebucto.ns.ca
Sent: Friday, April 09, 2010 11:54 AM
Subject: [NatureNS] earliest hummingbird
Hello all.
I was wondering what the earliest date was that you
first noticed a hummingbird ( from last spring ).
Unless I read the map wrong on hummingbird.net, it looks
like they are later this year? ( I was showing a student the web page
and it is totally possible that I didn't see it correctly )
Angela
Grade 4/5
Falmouth District School
--Boundary_(ID_RrA5h5MSv+NvjjaNr6ip+g)
Content-type: text/html; charset=US-ASCII
Content-transfer-encoding: 7BIT
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=us-ascii" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.18904">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV dir=ltr align=left><SPAN class=102235918-09042010><FONT color=#0000ff
size=2 face=Arial>Hi Bob and Angela,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=102235918-09042010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=102235918-09042010><FONT color=#0000ff
size=2 face=Arial>The diurnal cycle certainly triggers the start of
northward migration in many neotropical migrants. However temperature
thermoclines play a role in how fast the northern advancement takes place for a
number of species. They undoubtedly also play a role in how far south
non-neotropical species go in the fall/winter as well. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=102235918-09042010></SPAN> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>S</SPAN><SPAN class=102235918-09042010>uch a small
sample size of observations (4) over such a short time frame
(2009-2010) can not really be used to indicate what is going on
though. Using data from Journey North and from NS Birds, a different view
exists. In 2000 there was a sighting reported to Journey North April 18 but
it wasn't until May 6 that any more sightings were sent in (15 sightings were
reported between May 6-8). The ones reported to NSBS in that year were in a
similar range, most showing up the start of the second week in May. In 2004 the
majority of sightings for Journey North and NS Birds come from the first
week in May range. Using the majority of sightings for 2000 or 2004 as
a base, sightings are much earlier last year than then.
</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT><FONT face=Arial><FONT
size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>Is this apparent migration shift an example
of a historical cycle that has been repeating for hundreds of years, is it
a long-term trend indicating a change from what is to be expected or is it
simply randomness? </SPAN></FONT></FONT></FONT><FONT face=Arial><FONT
size=2><FONT color=#0000ff><SPAN class=102235918-09042010>For myself I feel that
climate change has an effect on birds and their migration. If someone has the
time, going back through NS Birds past issues for hummingbird sightings for the
last 40 years might prove insightful.</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>As Hans has pointed out, this year's warm weather
appears to have allowed Ruby-throated Hummingbirds to appear much further north
than this time last year. However, the weather has gotten colder again and this
may delay their appearance in NS to a point where they may show up in the same
range of dates that they did last year.</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT><FONT face=Arial><FONT
size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>I'm looking forward to hearing when the majority of
hummers are reported this year.</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>All the best,</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010>Lance</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=102235918-09042010><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT size=2
face="Courier New">====================</FONT></SPAN> <BR><SPAN lang=en-us><FONT
size=2 face="Courier New">Lance Laviolette</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face="Courier New">Glen Robertson, Ont.</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2
face="Courier New">====================</FONT></SPAN>
</P></SPAN></FONT></FONT></FONT></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> naturens-owner@chebucto.ns.ca
[mailto:naturens-owner@chebucto.ns.ca] <B>On Behalf Of </B>Bob
McDonald<BR><B>Sent:</B> Friday, April 09, 2010 2:01 PM<BR><B>To:</B>
naturens@chebucto.ns.ca<BR><B>Subject:</B> Re: [NatureNS] earliest
hummingbird<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT size=2>If you look carefully at the maps for 2009 and for 2010, so
far, there is not really a significant difference as far as Canada is
concerned.</FONT></DIV>
<DIV><FONT size=2>Last year at this time, there had been 2 reports in
Canada (s. Ontario), while this year there have been 4 reports. Is this
significant? I don't think so. As far as NS is concerned, there are
no reports yet for 2010 while in 2009 the first reports came on April 20, 22,
22, 23. April 20 is only 11 days away.</FONT></DIV>
<DIV><FONT size=2>Most migrating birds time their migration according to
the diurnal cycle (the length of the day) so just because we are experiencing
late spring-like weather here does not necessarily mean birds will arrive here
early. Those outliers which do arrive "early", like the Ruby-crowned
Kinglet that Suzanne and I saw and heard last Tuesday, may be more readily
noticed since it was singing in the warm sunshine.</FONT></DIV>
<DIV><FONT size=2>Overall, I am sceptical that our unseasonably warm weather
here has any effect on the arrival timing of migrating birds.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Cheers,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Bob McDonald</FONT></DIV>
<DIV><FONT size=2>Halifax</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"
dir=ltr>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=Htoom@hfx.eastlink.ca href="mailto:Htoom@hfx.eastlink.ca">Hans
Toom</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=naturens@chebucto.ns.ca
href="mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, April 09, 2010 12:22
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NatureNS] earliest
hummingbird</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2 face=Arial>Hi all,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The <STRONG>Ruby-throated Hummingbirds</STRONG>
are about 1400 kilometres further north this year than last year. Last
year they were crossing the North Carolina border in early April while this
year they are probably in Maine already.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Hans</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=aljoudrey@eastlink.ca href="mailto:aljoudrey@eastlink.ca">Angela
Joudrey*</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=naturens@chebucto.ns.ca
href="mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, April 09, 2010 11:54
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NatureNS] earliest
hummingbird</DIV>
<DIV><BR></DIV>
<DIV style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 16px">Hello all.<BR
_moz_dirty=""><BR _moz_dirty="">I was wondering what the earliest date was
that you first noticed a hummingbird ( from last spring ). <BR
_moz_dirty=""><BR _moz_dirty="">Unless I read the map wrong on
hummingbird.net, it looks like they are later this year? ( I was showing a
student the web page and it is totally possible that I didn't see it
correctly )<BR _moz_dirty=""><BR _moz_dirty="">Angela<BR _moz_dirty="">Grade
4/5<BR _moz_dirty="">Falmouth District School<BR><BR
_moz_dirty=""></DIV><BR></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
--Boundary_(ID_RrA5h5MSv+NvjjaNr6ip+g)--
next message in archive
no next message in thread
previous message in archive
Index of Subjects