BIOL 2060 Lecture Notes - Lecture 27: Hemoglobin, Lignin, Nitrification

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Supposed that in the amchitka island community in the 1970s, a species of crab was introduced which the resident sea otters found really tasty, so much so that they began preferentially feeding on the crabs. Increase in sea urchins, increase in kelp: decrease in sea urchins, decrease in kelp, decrease in sea urchins, increase in kelp. Increase in sea urchins, decrease in kelp: none of the above, how are nutrients exchanged among organisms and their environment, carbon, nitrogen, phosphorus. Flow vs. cycling: energy flow: makes a one-way trip through an ecosystem, nutrient cycling: is the use, transformation, movement, and reuse of nutrients in an ecosystem. What do we need c, n, p nutrients for: carbon, essential part of all organic molecules, abundant. May precipitate out as calcium carbonate and be buried in sediment (carbon sink: terrestrial environment: carbon in soil, peat, fossil fuels and carbonate rock remains there for long periods of time (carbon sink)

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