Morisita horn similarity index

moses selebatso p??e v P? 27. 11. 2015 v 03:55 +0000:

 Hello 
I am trying to analyse diet overlap (level of similarity) between two species. I have diet composition in %. I have tried to find the best tool, and thought Morisita horn will do, but I cant find the right package for. Is this the best tool?
Thank you,
Moses 
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Hi Moses,

this may be a matter of taste, but I like ordinations.
I assume you have data like this:

food.1 food.2... food.n species
2 2 ... 80 A
1 63 ... 5 A
30 20 ... 10 B
7 5 ... 70 B

Then I would run RDA - procedure rda() in the vegan package, with
something like: result<- rda(foodmatrix ~ SpeciesIdentity)
plot(result, disp=c("sp","cn"))
Interpretation of that plot is straightforward:
further the food.item is to the species.identity half, higher the
preferrence.

HTH,
Martin

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