How can I test the differences between species richness (table below) using means (S.obs) and standard deviation (se.obs) with vegan or any other package in R?
"Group.1" "S.obs" "se.obs"
"Cliona celata complex" 499.7143 59.32867
"Cliona viridis" 285.5000 51.68736
"Dysidea fragilis" 358.6667 61.03096
"Phorbas fictitius" 525.9167 24.66763
Thank you in advance! André
From the technical point of view, this looks very much like t-test with unequal variances. Check the formula, and plug in your data. The R function t.test() expects raw data, but if you already have means and se's, it is easy to calculate statistics by hand.
I have no idea how you obtained your numbers and therefore I cannot comment on the scientific point of view.