[Tweeters] FW: Lack of Barn Swallows
cassidix2005 at gmail.com
Sat Aug 18 22:11:43 PDT 2018
I know these are numbers only for the past 2 years........wish my records went back further. These are just dates of FOY and LOY (last of year). But definitely seems like numbers are down.
For South Portage Bay:
Tree swallows: first seen 28 April 2017, last one seen 28 June 2017; in 2018, 7 May 2018 - 31 May 2018.
VG swallows: 16 March 2017 – 28 June 2017; 14 March 2018 - 11 July 2018.
Barn swallows: 8 April 2017- 5 August 2017; 13 April 2018 – 3 August 2018.
Cliff swallows: 14 June 2017 – 24 July 2017; 14 May 2018 – 4 July 2018. (nested on 520 bridge, north side only).
I think another consideration is lack of suitable snags for nesting ( a limiting resource here).
Of particular interest is to watch the Barn swallows fly low over the Montlake playfield, weaving in and around searching for insects that are “disturbed” by humans playing Frisbee. Several times when no one else is on the field and I see Barn swallows foraging low over the grass.....I walk across the field dragging my feet and this attracts the Barn swallows and they fly circles around me.
From: Tweeters [mailto:tweeters-bounces at mailman11.u.washington.edu] On Behalf Of Hal Michael
Sent: Saturday, August 18, 2018 6:16 PM
To: Bud Anderson <falconresearch at gmail.com>; tweeters <tweeters at u.washington.edu>
Subject: Re: [Tweeters] Lack of Barn Swallows
Back in 1980 we moved into a newly built house south of Olympia. From 1996-2001we had Barn Swallows nesting in our barn (if we left the door open) and right over our front door. The front door pair had at least two nests a year. Then, it stopped. They disappeared and we never saw them again.
Part of the issue, I believe, is the continued growth of vegetation. The plants reach a point where the Barn Swallows no longer use the area. It may be that foraging areas are too overgrown, etc. We saw significant changes in the avifauna at that house as the yard went from bare ground to a complex of trees and shrubs.
I don't think that we appreciate how much the habitat changes when we see it every day. I drive along I-5 here in Olympia almost every day, and have done so since 1980. Those Doug firs along the freeway have not grown one little bit in that whole time. Amazing.
Not to downgrade the lack of bugs. Here's another possibility. Quite a bit of land that was protected by levees has been restored to intertidal conditions. These formerly open areas that were upland/freshwater based are now saltwater based and produce significantly fewer insects. The insectivores have no place to go to find bugs that isn't already occupied.
Science Outreach Director, Sustainable Fisheries Foundation
ucd880 at comcast.net <mailto:ucd880 at comcast.net>
On August 18, 2018 at 12:21 PM Bud Anderson <falconresearch at gmail.com <mailto:falconresearch at gmail.com> > wrote:
I have been watching late summer swallows at Sea-Tac on an incidental basis since 2001, enjoying the large numbers of family groups that used to congregate on the west side perimeter fence each summer. I always looked forward to their pre-dispersal numbers. I estimated this annual mixed species swallow flock to be in excess of 1,200 birds.
However, over the years, this number has decreased markedly and I doubt there are now more than 100 that gather there anymore. I will make sure to count them this week.
Even here on the Samish Flats, there are far fewer swallows than normal.
Like you, I find it incredibly depressing to even think of the possibility that we could lose our swallows.
As to causes, I think one of the most logical avenues of thought would involve the famous decrease in insects that is being reported these days.
Maybe we could hear from any swallow biologists out there.
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Tweeters at u.washington.edu <mailto:Tweeters at u.washington.edu>
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