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Thread subject: More Sad News From Rob Bierregaard
||11/02/10 07:18 am
||As I expected, we lost Neale over the Caribbean. This was a
particularly brutal season and gave us a real feel for the risks of
migration to South America in hurricane season.
I've updated the Migration 10 page as well as maps for the two birds
that are moving now--North Fork Bob and, despite my sage predictions
that he was done with migration, our DE youngster Thatch is in Cuba
now--aiming straight for what may be Hurricane Tomas!
Our other survivors have settled down, at least for the time being.
Sanford in the Bahamas, Sr. Bones in the mountains of Colombia, Belle
on the shores of Lake Maracaibo only a few miles north of our
youngster from last year, Buck. Buck is on the countdown for his
first trip north sometime next winter.
See Tracked Ospreys
There will be a lot of missing ospreys come the spring. Those tardy birds may not be so stupid after all.
||11/02/10 07:19 am
||Belle made it from Martha's Vineyard to South America in seven days. That must be some kind of record.
So that is incredible news.
||11/02/10 09:02 pm
||It certainly is Tiger, awesome speed, and so good to hear positive news amongst the bad.
Well done Belle and good luck Thatch. Fingers crossed he makes it through Hurricane Tomas.
||11/04/10 04:43 am
||Considering all the obstacles of migration, it's always wonderful news to hear of any survivals, which brings to mind wondering about "Lady". Who can forget the drama of her nest this past season! I was doing some "refresher" googling, and though we know that the chances of an osprey chick surviving their first migration are not that high, once they do make it a young osprey has a 60% chance of survival from one year to the next, and adults are 80-90% chance of survival. (Poole, Bierregaard, and Martell, 2002)
I am wondering, however, what Bierregaard statistics are since '02.
||11/04/10 04:50 am
||Yes Celeste the one thing we can always be sure of is that ospreys bring us drama in abundance.
As for the statistics. Anyone with a mind to can work them out as the data is all there :)
||11/04/10 12:00 pm
||Rob seems to have suffered a lot of losses over the last few years :( Particularly bad this year. I wondered about birds stopping off in Haiti - would contaminated water (cholera) have any effect on them? I think Rob's just putting the losses down to bad weather which I suppose is more likely. Can't help but wonder though.
||11/04/10 01:30 pm
||One of the disturbing things I noticed about A Murder of Crows (recent thread here) was that they put transmitters on a total of eight chicks and wound up with only one to trace for the experiment. That seems a really high rate of loss, and I could only wonder what it might have been without the transmitters.
||11/04/10 02:32 pm
||That's a huge rate of loss Marty. I'm wondering what happened to those seven. I suppose crows live a very different life from ospreys - no migration to contend with but maybe other difficulties like traffic and cats. I'd guess a transmitter might be much more of an incumbrance for them.
Is your arm all mended now?
||11/04/10 03:27 pm
||Hi, AnneUK1, yes, the arm is fine, and I am much better now. Thanks for asking. I will need treatments on my spine again real soon, but at least I know what that means and how much it helps, so no problem there.
The experimenters with the crows gave a very low chance of crows reaching adulthood, so perhaps that helps to explain why they have evolved to have such tight families. I didn't get any why answers from their discussion on that, though. I'm sure it goes back further than the problems crows have had with man since the introduction of agriculture, but then look at the effect on wolves after the introduction of live-stock ranching. Could be people, after all.
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