Help! poisson distribution test on spatial

#1
.i'm working on my thesis about bio diversity and stat analyses include poisson distribution. there is no process showing how to compute poisson (like how to solve for mean) on other thesis i've seen. Here is my Data:

Species --- Site 1 --- Site 2 --- Site 3
1 --- 4 --- 4 - -- 1
2 ---- 9 --- 3 --- 0
3 --- 2 --- 40 - -- 0
4 --- 7 --- 9 - -- 1

this is the Expected Frequency:
0 0.559588
1 1.554413
2 2.1589
3 1.998988
4 1.388186
5 0.771214
6 0.357
7 0.141684
8 0.06997

please show me the process or step by step on getting this expected frequency.:shakehead
HELP! please i really dont know this.. immediate reply is ver much appreciated.. i owe you so much for the help.