[Tweeters] Lack of Barn Swallows
ucd880 at comcast.net
Sat Aug 18 18:15:48 PDT 2018
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
> On August 18, 2018 at 12:21 PM Bud Anderson <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.
> Tweeters mailing list
> Tweeters at u.washington.edu
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