I agree, thank you for sharing, Robert. I had wondered also. I knew that despite our great pleasure in seeing so many here, the birds might in fact be facing very stressful situations in their usual breeding areas.
It's neat to see the historical data of them in our counties.
Washington Co., PA
From: Bird discussion list for Pennsylvania <PABIRDS...> on behalf of Ann Pettigrew <rook185...>
Sent: Friday, June 23, 2017 9:46 PM
Subject: Re: [PABIRDS] Recent Dickcissel appearances
So glad you posted this as I was wondering why there have been so many dickcissel sightings this year. Really interesting stuff.
> On Jun 23, 2017, at 4:15 PM, Robert Mulvihill <robert.mulvihill...> wrote:
> The recent spate of Dickcissel sightings across PA may have to do (as it
> did during the big summer invasion of Dickcissels in 1988) with extreme
> drought in the northern plains, specifically, North and South Dakota:
> From the National Climate Report (May 2017):
> "...it was dry across much of the Dakotas during the spring, and
> precipitation deficits accumulated quickly. According to the U.S. Drought
> Monitor, drought spread rapidly across the Dakotas in May as impacts became
> more apparent. Below-normal spring temperatures delayed planting and slowed
> crop growth in this region. During the month of May, the percent of topsoil
> moisture rated short to very short increased from 7 percent to 36 percent
> in North Dakota and from 12 percent to 38 percent in South Dakota. This is
> something to watch closely as we head into summer."
> For those who may be interested in reading it, I published an article
> almost twenty years ago now about the likely relationship between
> Midwestern spring droughts and the historic and recent invasions of
> Dickcissels in Pennsylvania Birds:
> http://www.pabirds.org/PABIRDS/BackIssues/PBV02N3.pdf PENNSYLVANIA BIRDS VOLUME 2, NUMBER 3, JUL - SEP 1988<http://www.pabirds.org/PABIRDS/BackIssues/PBV02N3.pdf> www.pabirds.org
PENNSYLVANIA BIRDS VOLUME 2, NUMBER 3, JUL - SEP 1988 Table of Contents _____ Editorial 81 Letters 82 Mississippi Kite (Kwater) 8 2
> It will be interesting to see how this year's influx compares to 1988's.
> Robert S. Mulvihill
> National Aviary
> 700 Arch Street
> Pittsburgh, PA 15212
> <Robert.mulvihill...> <Robert.mulvihill...>
> *The National Aviary <http://www.aviary.org> works to inspire respect for