Station
densites were significantly different in 2005
(F=3.57, P=0.035), but not in 2006 (F=2.08,
P=0.134). Mean densities of virile crayfish in
quadrats in 2005 (10.9/m2) and 2006 (9.6/m2)
were not significantly different (Wilcoxon ranksum
test, F=0.142, P>0.5).