I am new to this and am hoping that someone might be able to help.
I am using Distance Sampling to estimate the density and population size of western ringtail possums in urban parks and remnant bush patches. Distance has been used before with this species; however, only in much larger areas of bush.
I have my transects spaced at 40m apart, so each has an effective strip width of 20m. However, some of my parks are so small that I can only fit a few transects in.
My questions are
1) if my transect runs along a boundry is is OK to only search for animals on one side of the transect? Therefore the transect is unilateral instead of bilateral. It has been suggested to me that maybe in my analysis in Distance I could half the length of the unilateral transects to deal with this. Is this correct?
2) if I want to fit a final transect in at one end can it have a smaller effective strip width than the other transects? For example if the boundary is approxiamtely 40m from the last transect, can I put a final transect at 30m and have an effective strip width of 10m on either side for only that transect. Or do all transects in the same patch that I am determining abundance need to have the same effective strip width.
Thankyou very much for your help! It is much appreciated
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