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Lecture 10 - Lecture 10 Jan 28 Discussion Activity...

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1 Lecture 10: Jan. 28 Ecosystem Ecology: Flow of Energy & Cycling of Matter Flow of energy through ecosystems - Law of Thermodynamics - 1 0 & 2 0 productivity - trophic structure - trophic efficiency Cycling of nutrients through ecosystems - Carbon cycle - Nitrogen cycle - human impacts on cycling Discussion Activity This Week ‘Huntington Disease’ article - read article before you come to discussion (week 5 folder) Exam 1: Wed. Jan 30 6 to 8 pm; Rooms on CTools Jan. 30 lecture - exam review Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Reading: Ch. 54 :1243-1258 Ecosystem: the communities that exist in an area together with their abiotic environment Ecosystem Ecology How are organisms and the physical and chemical environment linked? First law of thermodynamics: • Energy is neither created nor destroyed • Energy can be transferred from one body to another • Energy can be transformed from one form to another Chemical energy e.g., the chemical (potential) energy in food will be converted to the kinetic energy of the cheetah’s movement. Ecosystems are energy transformers Energy FLOWS Through Ecosystems Energy flow links the components of ecosystems: primary producers, consumers, decomposers and the abiotic environment Why We Care
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2 Energy budgets depend on primary production Gross primary production (GPP) = total amount of chemical energy produced by autotrophs through the chemical reactions of photosynthesis in an area during a given time interval Producers:
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