[Basta-users] post-fledging survival - Julian day or capture days for input format?

[Diederik Strubbe]

Dear all,

Apologies but it has been brought to my attention that one sentence in
my previous e-mail is not complete. I mean to write "I assume the most
conservative manner to treat this is to set all ‘deaths’ [i.e.
independence of juveniles = end of tracking period] to 0 - i.e. death
unknown, as we don't have hard evidence that these birds have actually
deceased".

Cheers,

Diederik

On 8/3/2015 12:45 PM, Diederik Strubbe wrote:
> Dear all,
>
> Apologies but it has been brought to my attention that one sentence in
> my previous e-mail is not complete. I mean to write "I assume the most
> conservative manner to treat this is to set all ‘deaths’ [i.e.
> independence of juveniles = end of tracking period] to 0 - i.e. death
> unknown, as we don't have hard evidence that these birds have actually
> deceased".
>
> Cheers,
>
> Diederik
>
>
> On 8/3/2015 11:39 AM, Diederik Strubbe wrote:
>>
>> Dear BaSTA community,
>>
>>  
>>
>> I am involved in a radio-tracking study on survival rates of tropical
>> birds after fledging. Birds were followed from fledging until
>> independence (about two months for each bird). My main question is
>> about how to organize a data frame for input. As not all birds fledge
>> at the same moment, when using Julian days as input, after 60 days of
>> tracking, birds are assigned a 0 value – because we stopped looking
>> for that bird.  So, for example, on Julian day 312 a 0 can indicate
>> either that we did not find the bird on that day, or that we had
>> stopped searching for it.
>>
>>  
>>
>> Can I arrange that data so that ‘birth’ (here: day of fledging) =1
>> for all birds, and all following days are numbered from 2 to 61. So,
>> for example, in this arrangement, day 15 [the 15^th day of tracking]
>> refers to November 17^th for birds that fledged on November 2^nd ,
>> but to November 29^th for birds that fledged on November 14^th .
>>
>>  
>>
>> I should also note that although about half of the birds have only
>> been seed at fledging (on day 1, but no observations in the following
>> 60 days), we did not find any dead birds either. I assume the most
>> conservative manner to treat this is to set all ‘deaths’ [i.e.
>> independence of juvelines = end of tracking period]?
>>
>>  
>>
>> Many thanks in advance for any comments or suggestions.
>>
>>  
>>
>> Best wishes,
>>
>>  
>>
>> Diederik
>>
>> -- 
>> Dr.Diederik Strubbe
>> Evolutionary Ecology Group
>> Department of Biology
>> University of Antwerp
>> Middelheimcampus GV310
>> Groenenborgerlaan 171
>> 2020 Antwerpen, Belgium
>> office: +32 3 265 34 69
>> mobile phone: +32 477445568
>> skype user name: lakrinn
>
>
> -- 
> Dr.Diederik Strubbe
> Terrestrial Ecology Unit	
> Department of Biology
> Ghent University
> K. L. Ledeganckstraat 35
> B-9000 Ghent
> Belgium 
> mobile phone: +32 477445568
> skype user name: lakrinn

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