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Food webs can support food chains that are long and complicated, or very short. For example, grass in a forest clearing produces its own food through photosynthesis . A rabbit eats the grass.
Primary consumers, mostly herbivores, exist at the next level, and secondary and tertiary consumers, omnivores and carnivores, follow. At the top of the system are the apex predators: animals who have no predators other than humans. Help your class explore food chains and webs with these resources.
Food webs consist of different organism groupings called trophic levels. In this example of a coral reef, there are producers, consumers, and decomposers. Producers make up the first trophic level .
A food web describes the many species and interactions within an ecosystem. Mapping these interactions can show us how an entire ecosystem could fall apart if it loses even one species.
Fast Fact. A Million to One. Marine food webs are usually longer than terrestrial food webs. Scientists estimate that if there are a million producers (algae, phytoplankton, and sea grass) in a food web, there may only be 10,000 herbivores.
A healthy food web has many autotrophs, many herbivores and few carnivores and omnivores. The biomass of an ecosystem depends on how balanced and connected its food web is. When one part of the food web is threatened, other parts are threatened, too. Then the ecosystem's biomass decreases.
A healthy food web has an abundance of autotrophs, many herbivores, and few carnivores and omnivores. This balance helps the ecosystem maintain and recycle biomass. In addition, smaller animals are more numerous than larger ones. Tigers and ants are both consumers in a tropical food web.
summarize the role of photosynthesis and decomposition within food chains. distinguish between different trophic levels and describe examples of food chains in major marine ecosystems. order organisms in a food chain by trophic levels. Teaching Approach: Learning-for-use.
Marine Food Webs. Watch this brief, video picture of practice that captures everyday classroom life and provides real-life examples of how students learn and think about ocean topics.
All of the interconnected and overlapping food chains in an ecosystem make up a food web. Similarly, a single organism can serve more than one role in a food web. For example, a queen conch can be both a consumer and a detritivore, or decomposer. Food webs consist of different organism groupings called trophic levels.