From south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Tue Jun 1 14:02:13 2004 Received: from www.plaidworks.com (localhost [127.0.0.1]) by plaidworks.com (8.12.9/8.12.9) with ESMTP id i51L00iv015163 for <[[email protected]]>; Tue, 1 Jun 2004 14:00:00 -0700 (PDT) Received: from goose.mail.pas.earthlink.net (goose.mail.pas.earthlink.net [207.217.120.18]) by plaidworks.com (8.12.9/8.12.9) with ESMTP id i51KwFcu015105 for <[[email protected]]>; Tue, 1 Jun 2004 13:58:16 -0700 (PDT) Received: from user-vcauo7r.dsl.mindspring.com ([216.175.96.251] helo=pavilion.earthlink.net) by goose.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 1BVGKo-0000x8-00 for [[email protected]]; Tue, 01 Jun 2004 13:58:11 -0700 Message-Id: <[[email protected]]> X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Tue, 01 Jun 2004 14:01:54 -0700 To: [[email protected]] From: Bill Bousman <[[email protected]]> Subject: Fwd: Re: [SBB] Re: A bit geographically off topic : recovery of Bell's Vireo in S. California - hope for our county/region? Any local Black Capped Chickadee records? Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-BeenThere: [[email protected]] X-Mailman-Version: 2.1.5b1 Precedence: list List-Id: South Bay Birding List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Errors-To: south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Folks: I sent my reply just to David, however, I intended to share it with the group so here it is--sorry. Bill >Date: Tue, 01 Jun 2004 13:59:26 -0700 >To: "David Lewis, M.D." <[[email protected]]> >From: Bill Bousman <[[email protected]]> >Subject: Re: [SBB] Re: A bit geographically off topic : recovery of Bell's >Vireo in S. California - hope for our county/region? Any local Black >Capped Chickadee records? > >At 12:17 PM 6/1/04, you wrote: >>Just came back from a brief visit in Southern California where a local >>birder friend (Ron Beck) alerted me on May 30th that there was a singing >>Bell's Vireo at Sepulveda Dam (Los Angeles County). Sure enough, we saw >>it as it sang away its characteristic rising and falling >>cheedle-cheedle-chee song. To the best of our knowledge, this is a first >>for this location. About 8-10 pairs have now established themselves at >>nearby Hansen Dam, and apparently they are also now doing well in San >>Diego County at Anza Borrego as well as at Mission Dam etc.. This >>apparent recovery is occurring despite no active cowbird trapping program >>at most of these sites. So, perhaps things are looking up, and if the >>trend continues this species will start to reoccupy its former range. > >Is it that there is no cowbird control at these expanding sites or has all >cowbird control ceased? If it is the former, than the birds you are >seeing (and hearing) may be a sink population, while the source population >is in areas where cowbird control continues. > > >>My question to you all is whether Bell's Vireo was an established breeder >>in the South Bay area prior to its decline? > >The short answer is no. Grinnell and Wythe, who published a directory in >1927 of birds in the nine counties of the San Francisco Bay region, knew >of no breeding records for Bell's Vireo. Grinnell and Miller, however, in >publishing their 1944 map of the range of the Least Bell's Vireo >(_pusillus_) show it occurring in the eastern portions of Solano, Contra >Costa, and Alameda counties and, therefore, this suggests it was a regular >part of our avifauna. The difference between 1927 and 1924 was that two >instances of breeding occurred (three, actually, but I don't think >Grinnell and Miller knew of the Taylor record). One was along Llagas >Creek, near Gilroy, in 1932 when W. E. Unglish collected a set of eggs and >the same year in Corral Hollow when Gordon Bolander collected a juvenile >begging from its parents. Later, in 1937, Robert Taylor banded a nestling >somewhere near Corral Hollow. The Llagas Creek record is unequivocally a >part of the San Francisco Bay region, but the Corral Hollow records are >somewhat ambiguous and both may have occurred in San Joaquin County. > >Since Grinnell and Miller there is only one more instance of breeding and >amazingly this was also along Llagas Creek in 1997. There are extensive >rumors of additional breeding in the last 10 years, but I contend that all >of these records are misidentifications, probably of Hutton's Vireo. > >>Also in that same area at Sepulveda we saw a Black Capped Chickadee (I >>know, I know - its unbelievable - the bird looked healthy and was not >>banded). We have let Kimball Garrett and others down there know about it. >>Its hard for me to explain its occurrence at this location and at this >>time of year - does this has to be an escapee or are there records for >>the Bay Area that make a Southern California record of a vagrant at least >>plausible? > >I'm not aware of any Black-capped Chickadee records from the San Francisco >Bay area. Small (1994) states that the southern limit of dispersion is >King Salmon and Ferndale in Humboldt county. > >Bill Bousman >Santa Clara County records compiler _______________________________________________ Do not post admin requests to the list. They will be ignored. south-bay-birds mailing list ([[email protected]]) Help/Unsubscribe/Update your Subscription: http://www.plaidworks.com/mailman/options/south-bay-birds/south-bay-birds-archive%40plaidworks.com This email sent to [[email protected]]