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Thread subject: Not what I would have expected
||09/23/11 01:44 pm
||For those of us on Facebook, this is a neat page
For those of us not, it tells the tale of an adult male osprey who nests in the Grand Tetons ever year on the Idaho/Wyoming border nad has beenwearing a radio tracker for the last two years. Even though he could literally fly due south and go right down to the Gulf of California and Mexico, it is obvious he is male and can't stop for directions. His route goes Nebraska, Kansas, Oklahoma, Arkansas, Louisiana, Mississippi, possible clipping the very SW corner of Georgia, Florida and then finally coming to rest in Cuba!
||09/23/11 04:34 pm
||That does seem very strange but I guess it saves him flying over the Rocky Mountain range ??
||09/24/11 07:04 am
||The Rockies may be a factor, but I would guess that going south to Mexico does not offer the abundance of inland fishing which the east coast does down through Florida, plus the Bahamas, Cuba, and so forth. Check out the various birds migration routes for 2011 here:
Since ospreys live almost exclusively on fish, the routes shown above have, in some sense, been chosen by many thousands of years of osprey finding fish and passing along their genetic fishing habits to their young. Some may have tried to go south to Mexico, but IMO they may have died trying and thus did not reproduce much if at all.
Going south to Mexico would also require passing over a big desert area at some point I think. Although not high like the Rockies (a physical barrier), the dry, dusty and mostly fish-less desert would be a similar barrier to migration.
Does anyone know of any sites which track migration on the west coast? Are there osprey in Alaska who head south?
Have a good weekend.
||09/24/11 11:44 am
||This map does show a route further to the west than the link at the top of this thread, but no routes over the worst deserts in the Southwest USA:
There are plenty of references in articles and books to osprey living in Alaska, but I have not yet found any migration maps for them.
||09/24/11 01:20 pm
||I have been searching for migration maps too for Ospreys in western Canada and Alaska, without success. The only map I found was on Rob Bierregaard's site and it is not detailed:
I am wondering if that font of all knowledge, Tiger, would be able to help us?
||09/24/11 02:57 pm
||Thanks Pam, I never noticed that map on Rob's site before, so thanks for pointing it out. I have written him in hopes of finding more information about west coast osprey migration patterns.
I did find some osprey pictures on a Rogue River OR site, and the captions suggest that the birds nest there (not just travel through) so that seems interesting to me.
A search for "Rogue River osprey" turns up other interesting sites.
BTW, I would prefer to post live URL links, but don't know how to do this. Does one have to be an administrator to do this, or can you tell me how? Thanks.
||09/24/11 04:23 pm
||Seems to me the birds just take the quickest, easiest route to their wintering grounds and from the east side of the rockies that would be south-westerly. From Alaska and BC, Alberta, Washington, that would be straight down Puget Sound and the coast of Oregon, California, etc.avoiding the Olympic Mountains area.
For the quick links Peter, download the following:
||09/24/11 05:49 pm
||I found a couple of short things on the topic.
A very short bit, with a lot of info.
I know our local osprey winter here locally for the most part. When I first was introduced to osprey, thru the cam on this website, I soon discovered locally a pair was nesting for the first time in a LONG time. We now have at least a few nesting pair in my area, and I can see a bird most weekends when I trek over to Bolsa Chica to do a birdwalk.
||09/24/11 06:08 pm
||Oops... not sure what happened to my above second link, but it works!
||09/25/11 07:03 am
||Thanks Pam and Trishrg. I am working on getting a full PDF of Mark Martell's article which you posted above, and which was apparently the source of Rob Bierregaard's map linked by Pam yesterday afternoon, he informs me.
I guess I will also need to know how to insert a PDF here, if you would be so kind. Thanks.
||09/25/11 07:13 am
||OK here you go:
Mark Martell paper
||09/25/11 08:05 am
||Interesting map on p. 1231 here, from 2007 with birds from the Pacific NW etc.:
Elliot paper 2007
||09/25/11 10:43 am
||Peter- Thanks for kickin down the $12 to view the Martell paper. Interesting that the midwest birds take 3 routes for migration, though MN was the only source in the study it seems.
Other article map is good too, though the stats on DDT are still sad.
||09/25/11 03:55 pm
||I wonder what path the osprey that I saw in north/west Montana, take?
||09/27/11 11:31 am
||Here is an excellent brochure written by Charles Henny who I met once when he was taking an egg from an nest near my office on the Duwamish River in Seattle. He was studying effects of pollution on osprey eggs. It says osprey from Washington have been radio tracked to Mexico and Central America and shows migration maps
||09/27/11 03:21 pm
||Cool -- thanks cathy.
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