[Biomonitoring as an attempt to comprehensive pollutant registration: heavy metals content of feather samples of the sedentary bird species magpie (Pica pica L.) and goshawk (Accipiter gentilis L.) of the eastern Hamburg area affected by air pollution]

acid rain akkumulation animal indicateur animales indicadores birds bosques cd cu forests habicht hambourg hamburg hamburgo heavy metals indicator animals metales pesados oiseau pb pluie acide vogel