Lecture36_HumanEcology

Lecture36_HumanEcology - Human ecology I. Human impacts on...

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Human ecology I. Human impacts on the nitrogen cycle A. What is the nitrogen cycle? B. Analyzing the nitrogen cycle 1) Nitrogen atoms cycle through ecosystems, primarily via action of 2) Humans are 3) What are the consequences of this Nitrate pollution in Hood Canal • ammonia and nitrate from “septic systems” • predict: bacteria and archaea in the canal that use nitrate as an electron donor or as a nutrient • these cells die in late summer and early fall; • decomposers use O 2 as an electron acceptor: N 2 (atmosphere) amino groups (organic compounds with –NH 2 ) NH 3 NO 2 - (nitrite) NO 3 - (nitrate) plants, animals
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II. Human impacts on the carbon cycle A. What is the carbon cycle? 1) In terrestrial ecosystems What is a carbon sink? • wood locks up C for peat forms in cold and/or wet environments; • coal forms when peat is compressed and heated B. In marine ecosystems Where are carbon sinks in marine environments? • organic matter in benthos
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Lecture36_HumanEcology - Human ecology I. Human impacts on...

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