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Table 2 Results of significant differences (Mann–Whitney U test) between oyster densities on mussel beds between the islands of Amrum and Föhr (Amrum Deep), based on the comparison of annual summer (June–August) data

From: High mortality of Pacific oysters in a cold winter in the North-Frisian Wadden Sea

  NA01 NA02 NA03
2005–2006 0.10 0.07 0.78
2006–2007 0.39 0.43 0.35
2007–2008 0.046 0.20 0.78
2008–2009 0.18 0.19 0.86
2009–2010 0.01 0.89 0.58
  1. Significant differences (P < 0.05) are indicated in bold text. For positive or negative changes in oyster densities compare with Fig. 4