Please can somebody help me?

I am currently working on my dissertation,
but I need some help in figuring out which statistical test is best to use.

I have been looking into wildflower biodiversity found in churchyards.
I surveyed 18 churches over the summer.

I have been given species data on haymeadows from the wildlife trust, 15 sites in total -which I plan to use as control data

Unfortunately the data they have given me is just presence/absence data.
But the field method I used was quadrant sampling, so I have abundance data.

Here lies my problem, and would anyone be able to help me in how to progress with statistical testing?


Fortran must die
You need to define which method you are using and what presence/absence data is (or for that matter abundance data).