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Lake George, New York, an oligotrophic lake
Lake George, New York, an oligotrophic lake
Kurtkowiec Lake, an oligotrophic lake in the Tatra Mountains of southern Poland
Kurtkowiec Lake, an oligotrophic lake in the Tatra Mountains of southern Poland
Algal bloom in a village river in the mountains near Chengdu, Sichuan, China
Algal bloom in a village river in the mountains near Chengdu, Sichuan, China
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First trophic level. The plants in this image, and the algae and phytoplankton in the lake, are primary producers. They take nutrients from the soil o
First trophic level. The plants in this image, and the algae and phytoplankton in the lake, are primary producers. They take nutrients from the soil or the water, and manufacture their own food by photosynthesis, using energy from the sun.
Second trophic level Rabbits eat plants at the first trophic level, so they are primary consumers.
Second trophic level Rabbits eat plants at the first trophic level, so they are primary consumers.
Third trophic level Foxes eat rabbits at the second trophic level, so they are secondary consumers.
Third trophic level Foxes eat rabbits at the second trophic level, so they are secondary consumers.
Fourth trophic level Golden eagles eat foxes at the third trophic level, so they are tertiary consumers.
Fourth trophic level Golden eagles eat foxes at the third trophic level, so they are tertiary consumers.