The introduced clam Ensis americanus in the Wadden Sea: field experiment on impact of bird predation and tidal level on survival and growth

Table 3 Analysis of variance of body mass index [weight/(length)³] of E. americanus: Effect of site and plot-type on BMI

Source of variation	df	MS	F-ratio	P value
Site (HSS vs. LSS)	1	0.004	0.491	0.485
Plot type (+net, −net)	1	0.070	8.521	0.004
Site × plot type	1	0.073	8.936	0.004
Error	88	0.008
Total	92

A balanced data matrix was prepared by removing cases at random to equalize the number in each group to 23 specimens
df Degrees of freedom, MS mean square

ISSN: 1438-3888