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The nitrogen contents of reeds collected from three sites in the Fowlmere reserve are significantly different (Figure 1). (Kruskal-Wallis: H = 9.260, n1 = 5, n2 = 5, n3 = 5, P < 0.05)

Nitrogen content of reeds graph
Figure 1. Nitrogen content of reeds from three different sites within the Fowlmere reedbed: mean values with 95% confidence intervals.
(Source: Clements, DAV (2000) The ecology of stem boring mainscot moths in Phragmites australis reedbeds. PhD thesis, Anglia Polytechnic University.)