Hi all,
I have a data with 18 sites and 36 species overall. Data set comprises of presence or absence values in binary. And the sample size differs for each site. basically it looks like as the following,
sites sp1 sp2 sp3 .....sp36
site1 (n=28) 5 3 5 .....
site 2 (n=68) 2 0 8
and so on.
Please someone help me,
1. how can i arrange the data for easy analysis in R.
2. which package can be used to measure cumulative species richness
3. to avoid bias would like to do extrapolation to get an exact number of samples through rarefaction between the sites keeping area of the site as a parameter.
It depends what you mean by 'species richness'. You can start off by calculating the number of species present at each site, but also see taxon sampling and rarefaction curves in Gotelli N.J. & Colwell R.K. 2001. Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecol. Lett. 4: 379–391.
Thanks Jacques for your reply, I have calculated the number of species present at each site as its species richness. Further, I do not have an equal sample size for each site and my results show that the number of species present at each site increases with the sample size. How could I justify my results without having the equal sample size between the sites? Please kindly help me with this query.
Dear Pradheeps, I don't know what sampling techniques were employed, but the size of the sample may have been influenced by the number of species present at each site.
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