Jahresbericht 1999 - Biologische Station im Kreis Wesel e.V. (BSKW)
Jahresbericht 1999 - Biologische Station im Kreis Wesel e.V. (BSKW)
Jahresbericht 1999 - Biologische Station im Kreis Wesel e.V. (BSKW)
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Anzahl Rufer<br />
350<br />
300<br />
250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
12<br />
Laubfrosch-Bestand Dingdener Heide seit 1995<br />
22<br />
27<br />
1995 1996 1997 1998 <strong>1999</strong><br />
Jahr<br />
200<br />
300
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