McGILL BIRD OBSERVATORY

WINTER POPULATION MONITORING

Week 1:  October 31 - November 6, 2010

Welcome to the McGill Bird Observatory weekly report.  Click here for a complete listing of our archives.
Comments or questions are welcome at "mbo AT migrationresearch.org".

PICTURE OF THE WEEK:




Amid the many House Finches banded this week was this one noticeable
interloper, an after-hatch-year male Purple Finch.
(
Photo by Simon Duval)


MBO gratefully acknowledges the in-kind support provided for winter 2010-2011 by CCFA (Centre de Conservation de la Faune Ailée) in Montreal, in the form of bird seed to keep the MBO feeders stocked throughout the season.

 

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THIS WEEK

THIS WINTER

2010 TOTAL

SITE TOTAL

# birds (and species) banded

235 (14)

235 (14)

7917 (81)

31426 (106)

# birds (and species) repeat

17 (6)

17 (6)

1115 (52)

5456 (68)

# birds (and species) return

6 (3)

6 (3)

182 (33)

802 (37)

# species observed

33

33

161

202

# net hours

50.2

50.2

9650.9

49558.1

# birds banded / 100 net hours

468.0

468.0

82.0

63.4

Note: table does not include nocturnal banding (owls)

Banders-in-charge:  Simon Duval, Gay Gruner, Kristen Keyes
Assistants:
 Bob Barnhurst, Megan Chan, Jean Demers, Leah Den Besten, Amélie Drolet, Karine Duffy, Marie-Line Gentes, Diana Kirkwood, Betsy McFarlane, France Millette, Marissa Nolan, Melissa Scerbo, Jane Sorensen, Clémence Soulard, Bonnie Soutar, Rodger Titman

Notes:  Last year at this time we left the fall nets up for an extra week to see whether we were missing the tail end of migration for sparrows and other late-moving species, and ended up with just a trickle of birds (28 individuals) in 157 net hours.  This year we returned to our traditional approach of shutting down the fall nets after 13 weeks and switching to the winter nets, and the count was almost tenfold greater, although our effort in terms of net hours was less than one third of our 2009 total.  Of course in large part the birds we are catching now (and through the rest of winter) are being attracted to the feeders that are back in place and well-stocked, again thanks to the generous donation of seeds from the Centre de Conservation de la Faune Ailée. 

Owling also continued this week, with the end of our official six-week season coming on Friday night, although it was somewhat anticlimactic, as it and the night before were both rained out.  However, earlier in the week results were decent, with 11 more saw-whets banded, including an impressive late-season total of 6 on November 3.  The total count for the past six weeks now stands at 109 saw-whets and 1 screech owl banded, plus two foreign recaptures.  However, since the last night prior to the rain was so productive, we are going to continue on a part-time basis for at least one more week to see whether we can determine when the saw-whet migration is really over.  Any further results will be noted in the monthly report for November.

This week’s top 10   [last week's rank in brackets]

# individuals banded

mean # individuals observed daily

1.  Slate-coloured Junco (98) [3]

1.  Canada Goose (387) [3]

2.  American Goldfinch (54) [5]

2.  American Crow (113) [5]

3.  House Finch (42) [10]

3.  European Starling (97) [10]

4.  American Tree Sparrow (17) [4]

4.  Slate-colored Junco (67) [3]

5.  Black-capped Chickadee (6) [2]

5.  House Finch (38) [-]

5.  White-throated Sparrow (6) [5]

6.  American Goldfinch (32) [6]

7.  Fox Sparrow (4) [5]

7.  Black-capped Chickadee (21) [7]

8.  Northern Cardinal (2) [-]

8.  Mallard (16) [8]

 

9.  Ring-billed Gull (13) [-]

 

10.  American Tree Sparrow (11) [-]

Clearly this year's strong junco migration is continuing into November, with nearly 100 more banded this week, on top of the record total of 509 banded earlier this fall.  On the other hand, despite the lure of the feeders, we banded very few chickadees this week, suggesting that the strong migration which continued through most of the final week of fall ended abruptly. It is less surprising that last week's most banded bird, American Robin, was not banded at all this week, since it is unlikely to be attracted to the feeders (although we did catch a couple in the winter nets last year, probably attracted to the fruit remaining on the hawthorns there).  Like last year, large numbers of American Goldfinches and House Finches arrived soon after the feeders went up, as reflected by the large numbers banded this week.  Not listed in the table are the six species tied for ninth place with one individual banded each, including our first Common Redpoll of the year. 

The list of species observed changed quite substantially from last week, most notably with the top two species (Red-winged Blackbird and American Robin) falling completely out of the top ten.  leaving room for Canada Goose and American Crow to be the top two this week, as is typical for November.  While the disappearance of the blackbirds and robins supports our policy of cutting off fall migration monitoring at the end of October, the juncos were this week clearly still migrating in large numbers. The highest new entry on the list this week was House Finch, no doubt linked to the recent reinstallation of the feeders.  

In all, the 33 species observed this week were somewhat fewer than last year's 39 during the same period, but still a good number considering that our five-year average for November as a whole is only 34 species.  For the remainder of the season we will return to posting one update per month, then will resume with weekly reports when the spring season begins at the end of March.


Sparrows accounted for nearly half the species banded at MBO this week, with this late-lingering White-crowned Sparrow the most surprising of the six species.

(Photo by Simon Duval)


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