If I want to estimate the alfa and beta taxonomic diversity based in the sampliing of three ecosystems and I have two replicates from each, How can I manage the replicates in these calculations? what index for alfa and beta diversity are best in this case?
I would suggest the mean number of species for each ecosystem a alpha, and Whittaker's species turnover index for beta, where beta = (gamma-alpha)/alpha. Gamma equals total number of species. You have a very small sample size, so these measures are likely to be inaccurate
Please let me know if these references/sites are useful to you:
1. This article appeared in a journal published by Elsevier ... - John Bruno
johnfbruno.web.unc.edu/files/2011/11/Long-et-al-JEMBE_2012.pdfCached
by ZT Long - 2012 - Cited by 2 - Related articles
The eight replicated compositions in- ... Each predator richness treatment was replicated ... aggregation influenced alpha and beta diversity among treatments.
2. Effect of Disturbance Regime on Alpha and Beta Diversity of ... - MDPI
www.mdpi.com/1424-2818/6/1/1/pdfCached
Dec 19, 2013 - Keywords: disturbance frequency; alpha diversity; beta diversity; benthic organisms; intertidal; rock pool; nutrient .... damages among replicates [31]. Finally, these .... The effect of the factor
Dennis
Dennis Mazur
Hi Angela!
About your second question, its important to define what attribute of diversity you want to evaluate. That will define the kind of measure more appropiate for it. I suggest you to check on this papers that give another look on the classic diversity measures (both for Alpha and Beta components), taking into account the intuitive properties of diversity as a concept.
Hope this helps,
Juan Felipe
Article Partitioning Diversity Into Independent Alpha and Beta Components
Article Jost, L. Entropy and diversity. Oikos
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