Hi,

I need help with a problem since I can't find an exact answer by
reading/searching the internet.

I have a dataset with 58 landscapes where  7 species in total may co-occur.
However, some sites have different sampling efforts. I would like to
calculate a diversity index value for each landscape so I can sort out
landscapes with high diversity/poor diversity. The next step is to try to
explain these diversity differences with e.g. degree of forest
fragmentation in each landscape.

So my question is:
1. Which diversity index would be most appropriate when having only 7
species to consider?
2. How do I account for variable sampling effort in my count data when
calculating a diversity index such as Simson's diversity index in the vegan
package?

/Magnus
PhD-student in Umeå, Sweden

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