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(ecology) A particular position occupied by a group of organisms in a food chain.

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.

(ecology) A particular position occupied by a group of organisms in a food chain.

An energy pyramid illustrates how much energy is needed as it flows upward to support the next trophic level. Only about 10% of the energy transferred between each trophic level is converted to biomass.

(ecology) A particular position occupied by a group of organisms in a food chain.

Killer whales (orca) are apex predators but they are divided into separate populations that hunt specific prey, such as tuna, small sharks, and seals.