Sampling period | Elbe | Helgoland | Outer Eider | Spiekeroog | Inner Eider |
---|---|---|---|---|---|
Sep 1995 | 30 | 9 | 30 | – | – |
Apr 1996 | 30 | 14 | 30 | – | – |
Oct 1996 | 30 | 30 | 30 | – | – |
Apr 1997 | 30 | 30 | 28 | 30 | – |
Sep 1997 | 30 | 30 | 30 | 30 | – |
Apr 1999 | 20 | 20 | 19 | 9 | 15 |
Sep 1999 | 20 | 20 | 21 | 20 | 0 |
Apr 2000 | 20 | 20 | 20 | 9 | 18 |
Sep 2000 | 20 | 20 | 20 | 20 | 0 |