Tweeters,


As is often true of complex questions, there are at least two answers. Some White-crowned are sedentary and some are migratory. Quoting from Cornell Ornithology, BOL (I bolded some of the salient information):




"Of the 5 subspecies, 4 are migratory ( Z. l. leucophrys , Z. l. gambelii , Z. l. pugetensis , and Z. l. oriantha );





1 is sedentary ( Z. l. nuttalli ). Banding studies have revealed general patterns of migratory movements, especially for Z. l. leucophrys and Z. l. pugetensis , but much remains to be learned about specific migratory movements of individuals and local populations ( Cortopassi and Mewaldt 1965 ).

Migrates on a broad front ( Cortopassi and Mewaldt 1965 ), or by independent movements along several routes where weather and ground conditions permit ( DeWolfe et al. 1973 ). Eastern Z. l. leucophrys breeding from Great Lakes east to Atlantic Ocean migrate southwest to winter from central Texas to lower Ohio River Valley. Midwestern Z. l. leucophrys and Z. l. gambelii migrate due south to winter in w. Texas and Oklahoma. Most western Z. l. gambelii migrate from high latitudes in Alaska and Canada along inland routes through British Columbia, e. Washington, and e. Oregon to winter in California, Arizona, New Mexico, and w. Texas. Z. l. pugetensis migrate due south from w. Washington and sw. British Columbia, west of the Cascade Mtns., to winter in w. Oregon and w. coastal California. Z. l. oriantha breed in mountains of western states and winter in lowlands of sw. U.S. and n. Mexico ( Cortopassi and Mewaldt 1965 ).
Timing And Routes Of Migration


Breeding Ground Arrival And Departure Dates


For Z. l. leucophrys late May, mid-Sep ( Clement 1968 ); Z. l. gambelii mid-May, late Aug ( DeWolfe 1968 ); Z. l. pugetensis early Apr, late Aug ( Lewis 1975 ); Z. l. oriantha mid-May, mid-Sep ( Morton and Pereyra 1994 ).
Arrival Times During Migration (Early Fall, Early Spring)


Illinois (mid-Sep, early Apr), Iowa (late Sep, late Apr), Maine (late Sep, mid-May), Manitoba (mid-Sep, late Apr), Michigan (mid-Sep, mid-Apr), Montana (late Aug, late Mar), Nebraska (late Sep, late Mar), New York (mid-Sep, mid-Apr), N. Carolina (early Oct, mid-Mar), Nova Scotia (late Sep, early May), Ohio (late Sep, mid-Apr), Oklahoma (early Oct, early Mar), S. Dakota (mid-Sep, late Apr), Utah (mid-Sep, late Mar), Washington (mid-Aug, mid-Mar) ( Clement 1968 )."





Dan Reiff

MI



----- Original Message -----
From: "Bill Green" <bill at supposedly.org>
To: tweeters at u.washington.edu
Sent: Sunday, April 8, 2012 6:41:08 PM
Subject: Re: [Tweeters] White-crowned Sparrows Back?

The field guide I have in front of me (Peterson) has them as year-round
residents west of the Cascades and migratory in the east. Anecdotally,
they have just returned to my feeder (Vancouver, BC) this week after
being absent since last November or so.

Bill Green

On 04/07/2012 12:23 PM, Barry Ulman wrote:
> I've read a number of posts saying it's nice to have White-crowned Sparrows back. I didn't think they migrated.
>
> Barry Ulman
> Bellingham, WA._______________________________________________
> Tweeters mailing list
> Tweeters at u.washington.edu
> http://mailman1.u.washington.edu/mailman/listinfo/tweeters

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