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Trophic level
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The trophic level of an organism is the position it occupies in a food web. A food chain is a succession of organisms that eat other organisms and may, in turn, be eaten themselves. The trophic level of an organism is the number of steps it is from the start of the chain. A food web starts at trophic level 1 with primary producers such as plants, can move to herbivores at level 2, carnivores at level 3 or higher, and typically finish with apex predators at level 4 or 5. The path along the chain can form either a one-way flow or a food "web". Ecological communities with higher biodiversity form more complex trophic paths.
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.
Ecosystem
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An ecosystem is a system that environments and their organisms form through their interaction. The biotic and abiotic components are linked together through nutrient cycles and energy flows.
Flora of Baja California desert, Cataviña region, Mexico
Flora of Baja California desert, Cataviña region, Mexico
Global oceanic and terrestrial phototroph abundance, from September 1997 to August 2000. As an estimate of autotroph biomass, it is only a rough indic
Global oceanic and terrestrial phototroph abundance, from September 1997 to August 2000. As an estimate of autotroph biomass, it is only a rough indicator of primary production potential and not an actual estimate of it.
A freshwater lake in Gran Canaria, an island of the Canary Islands. Clear boundaries make lakes convenient to study using an ecosystem approach.
A freshwater lake in Gran Canaria, an island of the Canary Islands. Clear boundaries make lakes convenient to study using an ecosystem approach.
Biological nitrogen cycling
Biological nitrogen cycling