Hello,
I would like to post a message, but I was wondering if I had to subscribe first?
Here is my message:
II performed over the seanson a census of butterflies on 8 sites . I have for each date un number of individuals and of species. I would like to know which function I could use to test if species number is correlated to individual number.
Here is a view of my data: 
Number of individuals

P1I P2I P3I P4I P5I P8I 
[1,] 9.0 4.0 2.0 5.0 8 5.0 
[2,] 2.0 7.0 2.0 11.0 7 3.0 
[3,] 8.0 6.0 4.0 9.0 8 4.0 
[4,] 3.0 7.0 6.0 8.0 6 2.0 
[5,] 8.0 5.0 2.0 7.0 11 3.0 
[6,] 3.5 4.5 1.0 3.0 7 1.0 
[7,] 8.0 3.0 4.0 5.0 3 0.0 
[8,] 3.0 3.5 3.0 3.5 4 1.0 
[9,] 4.0 4.5 2.0 4.0 4 0.5 
[10,] 3.0 7.0 1.0 3.0 3 0.0 
[11,] 3.0 4.0 3.0 7.0 4 1.5 
[12,] 4.0 8.0 7.5 7.0 7 2.0 
[13,] 9.0 6.5 6.0 7.5 5 1.5 
[14,] 7.0 9.0 7.0 14.0 14 6.0 
[15,] 14.0 14.0 14.5 17.5 10 3.0 
[16,] 18.0 18.0 10.0 26.0 21 11.0 
[17,] 23.0 20.0 20.0 32.0 37 9.0 
 
number of species: 

P1S P2S P3S P4S P5S P8S 
[1,] 3.0 3.0 2.0 3.0 2.0 2.0 
[2,] 3.0 4.0 2.0 4.0 4.0 2.0 
[3,] 4.0 4.0 4.0 4.0 3.0 4.0 
[4,] 3.0 4.0 3.0 5.0 2.0 2.0 
[5,] 3.0 4.0 3.0 4.0 5.0 2.0 
[6,] 4.0 3.5 1.5 2.5 4.5 1.5 
[7,] 4.0 3.0 2.0 2.0 3.0 0.0 
[8,] 3.0 3.0 1.5 2.5 4.0 1.0 
[9,] 3.0 3.5 1.5 2.0 3.0 1.0 
[10,] 4.0 4.0 1.0 2.0 3.0 0.0 
[11,] 3.5 4.0 2.0 3.5 2.5 1.0 
[12,] 3.5 3.5 2.5 4.5 3.5 0.5 
[13,] 4.5 3.5 2.5 4.5 4.0 1.0 
[14,] 3.0 3.0 2.0 5.0 5.0 2.0 
[15,] 6.0 4.0 3.5 5.0 6.0 2.0 
[16,] 3.0 4.0 2.0 6.0 5.0 2.0 
[17,] 5.0 5.0 4.0 4.0 6.0 2.0 

I used cor.test, but  am not sure that it is the right way to do it 
I would greatly appreciate any comment. Thank you

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