Accounting for different movement rates in CTDS

[Maik Henrich]

Dear everyone,

At the moment, I am writing a discussion on population density estimation with the REM and CTDS for red deer and roe deer. While the results are very much comparable for one species, CTDS estimates are much lower with CTDS for the other.

I was wondering about how the CTDS handles the following situation: There are two species with very similar detection probabilities and actvity estimates, but one of the species travels much longer distances during its active phase.
Assuming the same population density, trapping rates would be lower for the "slower" species.

Is this somehow considered in the CTDS estimates or could it potentially somehow be considered?

All the best,

Maik

[Stephen Buckland]

You might see fewer animals, but you should record more detections per animal for the slower animals, and estimation should not be affected (though variance may be larger for the slower animals).

 

Steve Buckland

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