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Osprey Q & A

Sue C
17/07/2010 00:24

This thread is a total experiment! I thought of it because a few nights ago, a lot of of useful information about ospreys was being posted in the LG Diary comments, but because of the blog format, it will be out of sight once a new blog is posted, and easily forgotten.       

The idea for this thread:

·         To provide a place for people to ask questions about ospreys at Loch Garten, or ospreys in general, which members of the Forum will answer to the best of their ability. NB Questions directed to the team at Loch Garten, should still be posted in the Comments area of the Loch Garten Osprey Diary.

·         To preserve the answers for future reference

Asking Questions

For clarity, please only ask one question at a time.

Replying to Questions

Try to be specific, giving links to the relevant information where possible, or quote your sources. If you are giving your own opinions, recollections or theories, please make that clear.

If the question you are answering is not the last post in the thread, please use the Quote facility to include the question in your answer.     

General

To make it easier to search for the topic in the future, use the Tags field. For example, if your question is “Is Odin really Scandinavian?” enter “Odin” in Tags.

  • 04/07/2012 01:05 in reply to Tiger

    I think it's 17 returns from 37 fledged at Rutland between 2004 & 2010 & obviously still time this year for more returns. I think the nests from 2007 have been the only blank year.

  • 04/07/2012 01:14 in reply to Vespa Crabro

    Unknown said:

    I think it's 17 returns from 37 fledged at Rutland between 2004 & 2010 & obviously still time this year for more returns. I think the nests from 2007 have been the only blank year.

     

    In 2003 there were 6 ospreys fledged in England and as far as I know none were ever seen again.

    In 2004 there were three ospreys fledged in England and every one of them survived at least three years. There was a fourth fledged in Wales and some people believe that he is good old Monty the male in residence at Dyfi. Sadly the Welsh chick could not been ringed so we will probably never know.

    Now those figures are truly dramatic. They do suggest that there some factor which varies from year to year. I think that the most likely candidate is weather.

    Tiger Signature

  • 04/07/2012 01:29 in reply to Vespa Crabro

    Unknown said:
    I think it's 17 returns from 37 fledged at Rutland between 2004 & 2010

    Hi Vespa

    I evidently have one missing from my notes: I can account for

    • 9 offspring of 03(97) [5R, 5N, 30(05), 32(05), AW, Nora, 00(09), 01(09) & 28(10)]
    • 6 grandchildren of 03(97) [03(09), 11(10), 12(10), 24(10), 25(10) & 30(10)]
    • 1 other [06(09), from site O]

    Can you remind me who the other is/ was? And am I right in thinking that the identity of the site O male in 2009 has never been stated? Other than evidently not one of 03's progeny.

  • 04/07/2012 02:13 in reply to Rachel

    Rachel

    I think your missing one is Nora's brother 05(08) who returned to RW in 2010 as a 2yo, but not subsequently.  

    Can't help about Site O I'm afraid. AW's biography, first published in 2011, says he started breeding at Site O "last year" i.e. 2010,  but at least 2 chicks hatched there in 2009 including 06(09) who you mention above. 

    Was it you that was planning to have a go at compiling a Rutland Water family tree? Good Luck!!

  • 04/07/2012 02:17 in reply to Sue C

    Sue - it's more or less done. Layout is the difficult bit - ospreys are more prolific (and usually have more partners) than human families :-D

    Just waiting for this year's chicks to be ringed (plus any info we can prise out of them about the other nests...) & then I'll send Tiger a copy for the website or anything else he wants to do with it.

     

    EDIT - looks like I had a mistake in my notes, then: I had the 2008 site B chicks as 01, 02 & 03... Now sorted. Thanks!

  • 04/07/2012 02:36 in reply to Rachel

    Rachel R said:

    ...& then I'll send Tiger a copy for the website or anything else he wants to do with it.

    Hi Rachel, it is me who inputs the website stuff so look forward to seeing a copy myself. What software have you used to compile it?

    ChloeB & Tiger's Osprey Data

  • 04/07/2012 02:43 in reply to ChloeB

    Hi Chloe. Will do. So far it is just manuscript - I haven't tried to put ospreys into my family history software (yet...) Now that you've put the idea into my head, who knows?! Might be a suitable project to test the new software with...?

    For website purposes, scanned & emailed/ posted on FB might well be easier anyway.

  • 04/07/2012 02:45 in reply to Tiger

    Hazel b said:

    It is thought to be about 80%  but for some reason the ospreys born at Rutland seem to do rather better than that.

     

    Thanks for that info - and for all the stats and recordings provided by others.

    I do find the topic very interesting.

    "The road of excess leads to the palace of wisdom" - Wlliam Blake

  • 04/07/2012 02:56 in reply to Rachel

    Sounds great Rachel. Good luck with whatever you decide on, and thanks :)

    ChloeB & Tiger's Osprey Data

  • 04/07/2012 02:59 in reply to ClaireM

    Some stats from a study of Canadian ospreys:

    "According to the most recent estimates, about half of young Ospreys die in the first year; the mortality rate in subsequent years is between 16 and 19 percent. Available banding data (20 000 individuals have been banded in the last 60 years), indicates that Ospreys can live for 15 to 20 years; however, some individuals have lived much longer. The longevity record for the species is held by a banded bird that died, probably from a bullet, at age 35. Unfortunately, we don’t know whether this individual had bred every year up to its death. The greatest recorded number of breeding seasons for a single bird is 23. "