Spatial Mark-Resight in oSCR?

[Wes Binder]

Hey gang,

Is there a way to analyze spatial mark-resight data using oSCR? More specifically, adding encounters of unmarked individuals to your EDF.

Just looking for something similar to the addSightings() function from the secr package, but since I have telemetry data to integrate, as well, I thought using the oSCR package might be the better option.

Thanks very much.

Wes

[Daniel Linden]

Hi Wes,

We don’t have that functionality in oSCR. You might want to contact Ben Augustine about his SPIM work, he could recommend an approach whether using his R package or JAGS/Nimble.

I will say that adding the unknown ID encounters is not very valuable unless your SCR data are very sparse. Depends on context though...

On May 10, 2021, at 5:32 PM, Wes Binder <bind...@gmail.com> wrote:

Hey gang,

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[Wes Binder]

Thanks for getting back to me, Dan. 

Reaching out to Ben would be a good idea, thanks for the recommendation. I know he has worked on a gSMR study before that was very similar to what I'm trying to accomplish. I just wonder how well I would be able to follow some of Ben's complex coding!

We are working with a small study area and currently have a relatively large proportion of the population 'marked' with GPS collars, so ignoring the unmarked encounters and running things through oSCR might still be worthwhile. One reason I thought incorporating unmarked detections would help our density/abundance estimates is because there is a lot of landscape heterogeneity here that influences density, and thus need our estimates (and state-space) to reflect this. I figured that incorporating the unmarked detections would be a straightforward way of addressing this, but perhaps using a SCR-RSF model in oSCR would alleviate some of these concerns. I really just need to show how some covariates like ruggedness and elevation influence density, so the RSF may be the ticket to accomplishing that.

Thanks,

Wes

[PABLO PALENCIA MAYORDOMO]

Hi,

I will be also interested in SMR functions on oSCR. Very useful when working with unmarked species in which only a few animals are tagged.

Best

Pablo