An evenness index was also calculated to provide a truer idea of the vegetation found on
each hummock.

 Shannon Evenness J' = H'/H'max [9]
 where H'max = log s
 H'max = maximum Shannon diversity
 J' = evenness of species distribution
 s = number of species

 Community similarities were calculated for habitat on and off the hummocks. The
 Sorensen coefficient of community similarity (CCs) was used for comparison because of
 interest in only the presence or absence of species (Brower and others 1990).

 Sorensen Coefficient CCs = 2c/(si + s2) [10]
 c = number of species similar to both communities
 sl = number of species in community 1
 S2 = number of species in community 2


PHOTOGRAPHIC RECORD

 A photographic record has been kept of the Agrifos wetland system starting at
construction. Bi-monthly pictures were taken from permanent photo stations marked in
the wetland. A 1.5m section of PVC pipe was placed in the wetland next to the
benchmark point and at similar position between the last 9 hummocks. All photos from
within the wetland were taken from that five-foot height. Photos include images of each
group of three hummocks and from a point elevated above the wetland. Similar
photographic records were kept for the Cargill and Iluka sites.


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