Manitoba Chimney Swift Initiative: Bulletin 3 -- May 2014
The switch was thrown and the now
above-average daily temperatures resulted in a fast hatch of mosquitoes
and other insects. The 30+ C temperatures also spawned thunderstorms in
the Dauphin and Brandon regions. However, our dedicated monitors
prevailed and we have some excellent reports from May 29th, the third of the nationally-coordinated monitoring nights...
In
Winnipeg, two exciting developments took place. First, there was a
sensational roost at Site no. 6 = 175 Winston Rd; Assiniboine School.
Adolf, David, and Peter had 66 swifts roosting for the night! Last
year's count peaked at 8 chimney swifts. For this year's national blitz
nights, David summarized that: "May 21 was pretty quiet. May 25 more
birds (20) roosted than at any other time over our years of observing.
May 29 unbelievable - 66 birds roosted at Assiniboine School Site #6."
Momentum seems to be building for the roosting mass at this location.
Second,
the Old Grace Hospital site, which was saved from demolition by the
hard work of Nicole Firlotte and the Wolseley community, has come
on-line this year. Three swifts were seen entering the chimney mid-way
through the roosting hour.
In
St. Adolphe, there were fewer birds about but they were committing to
nest sites - 12 swifts roosted and 1 was unaccounted for by the end of
the roosting hour (compared to 15 swifts in town on May 25 with only 5
roosting). Significantly, all the nest sites are now claimed. Rob had a
wild ride with numerous entries/exits over at Club Amical. After sorting
through the data, it was apparent that a pair used the SE Club Amical
chimney, although only 1 roosted for the night, and 2 swifts roosted in
the NE Club chimney. Jacquie noted that 3 swifts roosted at Brodeur
Bros.; Roberta had 2 swifts roosting at the Church; and I had 3 in the
Main St. site. We were able to view Brodeur Bros. for about 25 minutes
before the roosting hour (I like to think of this as a "robust roosting"
session); a pair entered and then left the chimney after a few
minutes which indicated that nest building was underway. Sometimes a
helper is on-site at nest sites, so we will watch for activity patterns
during the day which indicate three birds. Otherwise, the St. Adolphe
swifts have a habit of sharing lodging until incubation is well
established i.e., the "third" bird from one site in the evening is
actually using another site during the daytime with it's partner. These
are the gems that get figured out with multi-site simultaneous
monitoring!
Fewer
chimney swifts also were reported by Ken in Dauphin - 28 roosted
compared to 48 which roosted on May 25. We can't be sure that the peak
roosting number has occurred as there was thunderstorm activity during Thursday evening which may have influenced the bird's behavior.
In
Selkirk, all four sites were covered by Ruby's volunteers. Roosting
totals were: Merchant Hotel = 0; Red Chimney = 7 (10 entries and 3
exits); Yellow Chimney = 0; and Tall Chimney = 49 (up from 36 on May
25). So, the Tall Chimney numbers are still climbing.
Over
in La Broquerie, David's pair came in for the night before sunset. Many
other monitors indicated that their chimney swifts also roosted in the
first half of the session, some even close to the very start of the
roosting hour. Perhaps with the high availability of insects in the air
column, the chimney swifts had full stomachs and lots of energy reserves
to hang up their feathers early...
Our fourth, and final, national monitoring night is Monday, June 2nd.
It may be a very informative evening overall. At the nest sites, if you
can muster an extra 15 - 20 minutes, look for entries/exits before the
roosting hour. Such "daytime" use is the best indication of nest
building in progress. At roost sites, we can compare data between nights
to determine when the abundance of chimney swifts peaked. We should all
be vigilant for those late fliers who defy the training manual and
cruise about after curfew (teenagers perhaps?).
Thanks
as usual to the monitors who are developing their neck muscles and
exercising their patience while staring at the chimney rims! I look
forward to hearing from you after Monday evening.
Happy birding, Barb Stewart