Corridor cutoff width

[Colin Guilfoyle]

Hi all,

I am running Linkage Mapper for multiple species in a landscape and one thing I'm uncertain about is the cost weighted truncation distance (how wide corridors will be). Is there any good advice on determining this value for different species? I understand it may not be an exact science but perhaps there is an iterative process to determine the most appropriate value? I have a similar question about the CWD cutoff in Pinchpoint Mapper also and whether this should be the same value as used for corridors ? 

Appreciate any advice on this topic. 

Thanks,

Colin Guilfoyle

[John Gallo]

Hi Colin,

This is the way I do it:

I suggest that you base minimum corridor width for your target species on local expert knowledge and/or the literature.  Once you have that distance, say, 2 km then do the following:

Run LM  once with the default and then if the corridors are not wide enough, run again with larger truncation value.  If they are too wide, look at the most narrow one and then query the values that are at the appropriate width (e.g. 1 km perpendicular from the least cost path). Note that value, say 150,000.  Then run LM again using that cwd threshold.

Yes, to date, I always use the same cwd truncation threshold for linkage pafthways tool and pinchointmapper tool.

Good luck!

-John

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John A. Gallo, Ph.D.

Project Director

LinkageMapper.org

and

Senior Conservation Scientist

Conservation Biology Institute

[Colin Guilfoyle]

Hi John, 

Thanks for the response and helpful suggestions! The issue for me (and maybe others) is the lack of literature on appropriate corridor widths for species - the 2km rule of thumb may be the best option here! I'll give this a go and see how I get on. 

All the best,

Colin