Manitoba Peregrines > Radisson Peregrines
Radisson - 2010 / Ivy & Princess
The Peregrine Chick:
--- Quote from: des on April 03, 2010, 23:26 ---Treys dad's mate overwintered!!!!actually stayed here????
How could this be?
--- End quote ---
Madame was from Cedar Rapids, Iowa and she was a mix of peregrine subspecies, including 1 or 2 European non-migratory subspecies - Scots and Spanish I believe. And she overwintered from the time we first spotted her in November/December 1990 (she hatched in 1989) until I last saw her in 2005, a year after she was forced off the Radisson territory by Princess. She was the mate of all four of our resident Radisson males - Pop, T-Rex, Simba and Trey. She is/was also Trey's Mom.
--- Quote from: Stormy on April 03, 2010, 19:44 ---Something that I've been thinking about and hoping you can answer. Do Peregrine's go through menopause, so to speak. Is there an age where the reproduction instinct fades away because of dwindling hormones and don't have the instinct to return to mate?
--- End quote ---
--- Quote from: The Peregrine Chick on April 03, 2010, 21:49 ---I'm afraid I don't know Stormy, if there is, could be that menopausal females my just decide to turn left instead of right on their way home, releasing the territory to whomever is there to take over. I'd be surprised if that was the case though, since they generally don't live that long <10 years I suspect that their wiring to reproduce doesn't have an offswitch though the biology may not be as fecund as time goes along ...
--- End quote ---
--- Quote from: des on April 03, 2010, 23:11 ---So "they " just refers to females? I did think there was a posting about living to 15 years - or was that just males or my faulty memory?
--- End quote ---
Sorry, should have been clearer - the key word in the sentence is "generally". Most peregrine don't live into their teens, heck half don't make it to their first year. Most that do make it to year 2 don't make it past 10 years old. That applies for males and females. Oldest bird in the wild is I believe a male who made it to 19 years plus some months I believe. Survivorship for Falcon peregrinus anatum is about 80% per year after second year. That means that at year 10, 11% of all the birds hatched that same year are still alive, at year 20, only 1% are still alive. Median age is 4.5 years for both genders. Most of our breeding birds last a wee bit longer than that.
All of our Manitoba-hatched birds breeding outside the province are female. Our Manitoba-hatched males have only been found nesting in Manitoba, none outside the province. We have had some captive-bred males released from Manitoba that have gone on to nest elsewhere, but not males hatched in Manitoba, or none that we have had reported to us.
des:
--- Quote from: The Peregrine Chick on April 03, 2010, 21:49 ---
--- Quote from: Stormy on April 03, 2010, 19:44 ---I also wondered if maybe Princess knows/senses that Trey won't be back?
--- End quote ---
Couldn't tell you, have no idea if they travel to the same area or even if they travel via the same route. Last year they were back together but that was an anomaly I haven't seen elsewhere in our history, usually they come in separately. Trey's dad came back at the end of Feb one year, way before anyone else did/has - his mate overwintered so she was there waiting but they didn't nest any earlier that year ...
--- End quote ---
Treys dad's mate overwintered!!!!actually stayed here????
How could this be?
des:
--- Quote from: The Peregrine Chick on April 03, 2010, 21:49 ---
--- Quote from: Stormy on April 03, 2010, 19:44 ---Something that I've been thinking about and hoping you can answer. Do Peregrine's go through menopause, so to speak. Is there an age where the reproduction instinct fades away because of dwindling hormones and don't have the instinct to return to mate?
--- End quote ---
I'm afraid I don't know Stormy, if there is, could be that menopausal females my just decide to turn left instead of right on their way home, releasing the territory to whomever is there to take over. I'd be surprised if that was the case though, since they generally don't live that long <10 years I suspect that their wiring to reproduce doesn't have an offswitch though the biology may not be as fecund as time goes along ...
--- End quote ---
So "they " just refers to females? I did think there was a posting about living to 15 years - or was that just males or my faulty memory?
Ellie:
Thank you Tracy. I knew I had seen it before but guess I forgot where to look for it Nothing unusual for me! :-*
The Peregrine Chick:
--- Quote from: Stormy on April 03, 2010, 19:44 ---Something that I've been thinking about and hoping you can answer. Do Peregrine's go through menopause, so to speak. Is there an age where the reproduction instinct fades away because of dwindling hormones and don't have the instinct to return to mate?
--- End quote ---
I'm afraid I don't know Stormy, if there is, could be that menopausal females my just decide to turn left instead of right on their way home, releasing the territory to whomever is there to take over. I'd be surprised if that was the case though, since they generally don't live that long <10 years I suspect that their wiring to reproduce doesn't have an offswitch though the biology may not be as fecund as time goes along ...
--- Quote from: Stormy on April 03, 2010, 19:44 ---I also wondered if maybe Princess knows/senses that Trey won't be back?
--- End quote ---
Couldn't tell you, have no idea if they travel to the same area or even if they travel via the same route. Last year they were back together but that was an anomaly I haven't seen elsewhere in our history, usually they come in separately. Trey's dad came back at the end of Feb one year, way before anyone else did/has - his mate overwintered so she was there waiting but they didn't nest any earlier that year ...
--- Quote from: Ellie on April 03, 2010, 20:48 ---Tracy I have just perused all of the March Observations as I thought there was a family tree of sorts but found that it was a "who nested with who etc". I wanted to find out how old Trey is .........seven sticks in my head for some reason but when I find that Ivy is 5 years old that really doesn't make any sense. So to keep me from overworking my brain could you please let me know how old he is. Thanks. ??? ;D
--- End quote ---
Trey, if he returns this year will be 14 years old. Princess is 8 years of age.
And if you want to look at the first of the family trees - http://www.species-at-risk.mb.ca/pefa/p-trees.html
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