00271nam a2200109Ia 4500008004100000020001700041082001500058100002200073245002500095260003300120300000800153190710s9999    xx            000 0 und d  a0-07460474-0  a574.5 T663  aTownsend, Colin R 0aEssentils of ecology  aUSAbBlackwell Sciencec2000  a552