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

Table 1 Analysis of variance of survival data of E. americanus: Effect of site and experimental plot on percentage survival (arcsine transformed data) of clams

Source of variation	df	MS	F-ratio	P value
Site (HSS vs. LSS)	1	66.84	0.949	0.344
Plot type (+net, −net)	1	452.21	6.421	0.022
Site × plot type	1	312.48	4.437	0.051
Error	16	70.43
Total	20

At both sites (HSS and LSS) five plots with and without net were established. To each plot (0.64 m²) 20–25 clams were added. The experiment was established in late September and finished in early December
df Degrees of freedom, MS mean square

ISSN: 1438-3888