Beaver monitoring

[stefano palmero]

Hi all,

My team is collecting camera-trapping pictures of beavers in a protected area and we can recognise individuals from tail scales for abundance count.

I was wondering if SCR models could be used for such a species, since individuals spend most of the time in their lodges located in the ponds (everything else on land should therefore be masked out) and only go on short excursions for browsing, which is when we detected them. 

My doubt concerns the modelling framework, as I can't seem to imagine spatial density estimates for species whose activity centre is known (the lodge).

Thank you very much

Stefano

[Duane Diefenbach]

Stefano,

Just a couple of thoughts on your problem. First, beaver (my experience is with Castor canadensis) sometimes have dens in river banks, which may be more difficult to detect. I don't know if your system might have a substantial portion of the population using bank dens. You could potentially treat this as a 2-level estimation problem where you first estimate the number of dens and then estimate the number beavers per den. Each level would require different data collection methods but could readily be combined into a single population estimate.

Regards,

Duane

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[Fridolin Zimmermannn]

Dear Stefano,

I suggest that you contact my friend Christof Angst (christo...@unine.ch) who is responsible for the beaver monitoring in Switzerland. You could also contact Nicolas Stettler nicolas....@students.unibe.ch https://www.cb.iee.unibe.ch/about_us/stettler_nicolas/index_eng.html 

They probably have had to think about this question.

Good luck with your study

Best wishes

Fridolin

Fridolin Zimmermann

Wildlife biologist (PhD)

Coordinator of the large carnivore monitoring in Switzerland

KORA, Talgut Zentrum 5, CH-3063 Ittigen

Tel: +41(0)319517040

Mobile: +41(0)796049482

www.kora.ch

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[stefano palmero]

Dear Fridolin,

Thank you very much for the contacts!

Best

Stefano Palmero

Faculty of Environment and Natural Resources

University of Freiburg

Tennenbacher Straße 4

79106 Freiburg

Germany

[Murray Efford]

Stefano

The question is how to think of the population (the state variable) and Duane gave you some strong leads there. If the population indeed exists only at discrete known points (lodges) then we're in new territory that I, at least, haven't thought through.

Murray

[stefano palmero]

Dear Murray,

Thank you for the prompt response.

I will probably go for abundance only.

Best

Stefano Palmero

Faculty of Environment and Natural Resources

University of Freiburg

Tennenbacher Straße 4

79106 Freiburg

Germany

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