Traps as sites

[Wijid]

Thanks Murray for that.

I have now downloaded density 4.4 and will work my way through a couple of examples. Given my concerns about closure would you still recommend I try my data in your program?

You may be able to fit a more finely subdivided model by fitting detection parameters common to multiple 'sessions', thus pooling information.

Does this mean if I sample three times a week for six weeks (18 sessions) and I pool over each week I get 6 sessions? Sorry just trying to unconfuse myself

Thank you Murray for your continued replies, I appreciate the time you have taken to answer my questions!!

Wendy

[darryl]

Wendy,
How many animals did you capture per trapping session and how captures?

[Wijid]

Murray,
At one site (Majura) we caught between 0 and 9 animals per session average was 1.12
At the other (Woden) we caught between 0 and 58 average 8.47

Not sure what the rest of the question was but this is my summary for up to summer 2008 (we had one more session in 2009 I haven't summarised yet)
MAJURA:
Season Summer 2006 Spring 2006 Summer 2007 Spring 2007 Summer 2008
Total captures 14 14 17 32 7
Total No unique individuals within season 11 7 4 8 4
Total No new individuals 11 6 3 6 3
Highest No of captures for one individual 2 6 12 8 3
Average No of times an individual is captured 1.27r 2 4.25 4 1.75
Total No individuals from previous seasons - 1 1 2 1

WODEN
Site Summer 2006 Spring 2006 Summer 2007 Spring 2007 Summer 2008
Total No unique individuals within season 208 75 28 11 32*
Total No new individuals 208 40 16 4 28
Highest No of captures for one individual 10 9 12 7 9
Average No of times an individual is captured 2.08 2.28 4.93 2.36 3.28
Total No individuals from previous seasons - 35 12 7 2**

I read somewhere that you recommended recaptures >10 which was clearly not the case for my data

Cheers
Wendy

[murray.efford]

That was Darryl's question, so I expect he'll chip in, but it looks like you have enough data for SECR - certainly many more than 10 recaptures in total (see FAQ). From your between-season recaptures these seem to be fairly long-lived animals, so closure over 6 weeks doesn't seem improbable.
Murray

[Wijid]

Sorry Murray about - I thought I was still replying to you

I clearly read the FAQ wrong, I thought it meant on average 10 per animal as a minimum (I thought that was very high). They only live for about a year on average with a few living 2-3 years (although as you may have noticed between season recaptures reduced as time went on (Survival declined)).

Thank you again.

Wendy