LISTSERV mailing list manager LISTSERV 16.5

Help for VTBIRD Archives


VTBIRD Archives

VTBIRD Archives


VTBIRD@LIST.UVM.EDU


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

VTBIRD Home

VTBIRD Home

VTBIRD  April 2017

VTBIRD April 2017

Subject:

Re: What's with woodcocks this year?

From:

alison wagner <[log in to unmask]>

Reply-To:

Vermont Birds <[log in to unmask]>

Date:

Tue, 18 Apr 2017 09:38:25 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (146 lines)

I know that at Avian Haven, a rehabilitation center in Freedom, Maine, there were several Woodcock "rescued" during/after the storm.  Most were diagnosed as being starving and one (that died) showed disease.  The others fully recovered, doubled their weights, and were released recently.

Ali
Huntington

----- Original Message -----
From: "Ian A. Worley" <[log in to unmask]>
To: "Vermont Birds" <[log in to unmask]>
Sent: Tuesday, April 18, 2017 9:30:37 AM
Subject: [VTBIRD] What's with woodcocks this year?

I've been asked by several folks if woodcocks in Vermont are less 
abundant this year than usual.  Were the early warm spells and then the 
return to winter cold and Nor'easter snows the cause of seemingly low 
abundances?  What can we learn from eBird data?

So I've gathered some eBird numbers from 2008 through 2017 from the 
first observation of the year through the first half of April (which 
includes the peak frequencies).  In this case frequency of encountering 
woodcocks is a better measure than the number of woodcocks found at one 
time, since the average number of birds per checklist doesn't vary much.

This overview is for the entire state, so it doesn't explore data at a 
county or backyard level.

*First reports* --- This year was the first year to have the first 
Vermont reports in February.  Among the last ten years, the latest first 
report was in 2015 in the last week of March.  With the exception of 
anomalous 2015 all the first reports from 2012 to 2016 were in the first 
week of March, whereas the first reports in 2010 and 2011 were in the 
second week of March, and those of 2009 and 2008 were in the third week 
of March.

Thus, there is clearly a trend toward earlier first reports of Woodcocks 
in recent years.

*Peak report frequencies* --- Here are the peak weekly frequencies for 
this year back to 2008. This year is one of the three lowest frequencies 
during the period.  The average frequencies for the last three years is 
5.7; for the preceding three years is 5.7; and for the remaining four 
years (2008-2011) is 7.5.  So the frequency of observations in the last 
six years is notably lower than in the preceding four years.  And this 
year is one of the lowest frequency years in the 10 year period.  But 
this might not be as significant as it appears because it only looks at 
one two-week period (see the next topic).

2017    4.9
2016    6.1
2015    6.1
2014    5.6
2013    4.0
2012    7.4
2011    5.0
2010    6.1
2009    10.9
2008    7.8

*Frequencies for first two weeks of April* --- This is the period that 
typically has the highest frequencies of observation. The average of 
these frequencies is 4.8.  So this year's peak period for woodcock 
observations actually is not low or high, but right at the long-term 
average.  Moreover it is notably higher than last year, which had the 
lowest frequency during peak observations for the 10 years.

2017    4.7
2016    3.7
2015    5.3
2014    5.4
2013    3.9
2012    4.3
2011    4.4
2010    5.1
2009    6.4
2008    4.9

*Average bird counts during peak frequencies* --- The average count of 
birds during woodcock encounters during peak frequencies is 2.0.  This 
year is right in the middle and quite typical.

2017    1.9
2016    1.8
2015    1.7
2014    1.7
2013    2.0
2012    2.0
2011    2.1
2010    2.3
2009    3.1
2008    1.8

*Peak report dates* --- Peak report dates have a different meaning than 
do first arrivals.  Here are the weeks with the highest observation 
rates.  The latest was the 3rd week of April in 2008, and the earliest 
are three scattered years with peaks in the last half of March.  All but 
one are between the 3rd week of March and the 2nd week of April, with no 
trend showing.

2017    2nd week of April
2016    4th week of March
2015    2nd week of April
2014    2nd week of April
2013    2nd week of April
2012    3rd week of March
2011    1st week of April
2010    1st week of April
2009    4th week of March
2008    3rd week of April

*Time between first reports and peak frequencies* --- Long periods 
between first reports and peak reports might indicate that weather and 
ground conditions might have been too cold, snowy, and frozen for 
survival after the first birds arrived.  Here are the lengths of time:

2017    6 weeks
2016    2 weeks
2015    2 weeks
2014    5 weeks
2013    5 weeks
2012    2 weeks
2011    3 weeks
2010    3 weeks
2009    1 week
2008    4 weeks
*
**Relationship between period of time between first arrivals and peak 
time vs. the frequency of woodcocks at peak* --- There is none 
observable.  So what happens to the very early arrivals doesn't seem to 
have much effect on the overall population.

*So what's up with woodcocks this year ??* ---- Not much. It is a pretty 
average year except for having the earliest arrivals in the eBird 
record, which helps to create the longest period of time between the 
first arrival and peak frequency.  If compared with last year, there are 
more woodcocks being reported this year than last by 27%.

Here at my location on the southern end of Snake Mountain in Cornwall, I 
do morning and evening observations for woodcocks beginning in early 
February.  After a couple of remarkably early birds in February, there 
was a long, long wait until they began to show up in late March.  For 
the past three weeks they have been continuously present as normal, 
though from my observation location it is difficult to monitor numbers.

Best spring wishes,

Ian

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
December 2003
November 2003
October 2003
September 2003
August 2003
July 2003
June 2003
May 2003
April 2003
March 2003
February 2003
January 2003
December 2002
November 2002
October 2002
September 2002
August 2002
July 2002
June 2002
May 2002
April 2002
March 2002
February 2002

ATOM RSS1 RSS2



LIST.UVM.EDU

CataList Email List Search Powered by the LISTSERV Email List Manager