Weisser Schwan

Pflanzen und Tiere

Algen und Pflanzen

Algen und Pflanzen sind die Basis des Nahrungsnetzes und Stoffkreislaufs. Mit Sonnenlicht als Energiequelle bauen sie aus Mineralsalzen, Wasser und Kohlendioxid organische Materie auf. Deshalb leben sie am Ufer (Wasser- und Uferpflanzen) und in den oberen Wasserschichten (Phytoplankton).


Das Zooplankton, Kleintiere, Fische, Amphibien und Reptilien sowie Vögel ernähren sich entweder von Algen und Pflanzen oder von anderen Tieren.

Bakterien, Pilze, Würmer

Bakterien, Pilze und Würmer schliessen den Stoffkreislauf und zerlegen abgestorbene Pflanzen und Tiere wieder in ihre mineralischen und gasförmigen Bestandteile. Sie leben bis in tiefe lichtlose Seeschichten (Zehrschicht).

Plankton aus dem Vierwaldstättersee


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