[R-sig-eco] Diversity on standardised densities in R

[Paris]

Hello all,

I want to calculate classic diversity indexes from my zooplankton samples.
The problem is that the number of individuals is not the same in all cases
(some samples were semi-empty) and that is the case for the amount of sample
I analysed. In order to standardise for effort, I want to do the following:
a) randomly sample e.g. 50 individuals from each of my sample, so that I
standardise for effort (that's the difficult part)
b) then calculate on this newly created matrix all the typical indexes
(that's the easy part)
I ll give an example of a dataset in R, where samples are rows and species
are columns:

0	0	0	0	0	2	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	85	0	0
0	0	0	0	0	45	5	57	0	0
0	0	0	0	0	13	0	3	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	7	0	0
0	3	0	0	12	8	0	57	0	0
0	0	0	0	0	0	0	1	0	0
0	0	0	0	0	59	0	0	0	0
0	0	0	0	4	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	105	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0
0	0	0	0	1	0	0	100	0	0
0	35	0	55	0	0	0	0	0	0
1	4	0	0	0	0	0	0	0	0
0	0	0	0	0	34	21	0	0	0
0	0	0	0	0	9	17	0	0	0
0	54	0	0	0	27	5	0	0	0
0	1	0	0	0	1	0	0	0	0
0	17	0	0	0	54	3	0	0	0
1	0	0	1	0	6	10	0	0	0
1	18	0	0	0	1	2	0	6	2
0	5	0	0	0	35	57	0	0	0
0	3	0	0	0	4	3	0	0	0
0	0	0	0	0	6	5	0	0	0
0	0	0	0	0	5	4	0	0	0
10	5	8	10	0	25	19	0	0	0
0	2	7	0	0	6	11	0	0	0
15	0	0	0	0	8	7	0	0	0
13	2	0	0	0	20	11	0	0	0
13	0	0	0	0	0	11	0	0	0
8	0	0	0	0	15	10	0	0	0
0	1	0	32	1	13	12	0	0	0

Anybody any ideas how to do this in R?



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