Biology 2483A Lecture Notes - Lecture 20: Steller Sea Lion, Trophic Cascade, Primary Production

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Trophic levels describe the feeding positions of groups of organisms in ecosystems. First consider the primary producers, then think of where these animals are in relation to the primary producers. All autotrophs are one group when we consider energy flow. From earlier chapter: desert is low in terms of energy but has high species diversity. Detritivores same trophic level as primary consumers. Feces adds to the detritus dead organic matter. Photic zone, 200 m, light utilized by autotrophs. Organisms photosynthesizing, when they die they go to deep waters. Detrital material is falling down, can see from submarines -> marine snow. Abyssalpelagic = allochthonous: from outside the ecosystem the energy is produced. Can last for a long time (10+ years) rich energy source to the benthos. The amount of energy transferred from one trophic level to the next depends on food quality and on consumer abundance and physiology. Looks like a system where energy is coming from outside.

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