lecture 35 - EBIO 1220 General Biology Lecture 35 Ecosystem...

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EBIO 1220 General Biology Lecture 35 Ecosystem Ecology 1 Ecosystem Ecology I. Introduction II. Energy Flow III.Biogeochemical Cycling Chapter 54 I. Introduction Organismal ecology coping Population ecology limiting factors Community ecology interspecific interactions and diversity Ecosystem ecology energy flow and chemical cycling Landscape ecology spatial patterns in ecological systems and how those systems function Global ecology Ecosystem Ecology • All organisms in a community and abiotic factors with which they interact ¸ Scale depends on question ¸ Most inclusive - earth aquarium forest I. Introduction Ecosystem Dynamics Energy flow – Cannot be recycled – Starts from sun --> chemical energy through food web --> exits as heat Fig. 54.2 Chemical cycling – Cycles through ecosystem – Trophic levels connected by decomposition Primary Producers Sun Primary Consumers Secondary Consumers Tertiary Consumers Detritus I. Introduction Laws of physics and chemistry • 1st Law of Thermodynamics – Energy is conserved, but cannot be created or destroyed, only transformed • Construct energy budgets! • 2nd Law of Thermodynamics – Energy transmission is not efficient; some lost in any conversion process • Measure efficiency of ecological energy conversions I. Introduction Chemical Cycling • Elements are not lost, but move through trophic levels and ecosystems • Can measure the cycles of chemical elements in ecosystems, including the biosphere I. Introduction
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EBIO 1220 General Biology Lecture 35 Ecosystem Ecology 2 II. Limitations on Primary Production • Primary Production (PP) – Amount of light energy converted to chemical energy (organic compounds) – Ecosystem’s energy budget depends on PP – 1% of visible light reaching photosynthetic organisms converted to chemical energy • Gross Primary Production (GPP) – Total PP • Net Primary Production (NPP) – NPP = GPP - R (R = plant cellular respiration)
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This note was uploaded on 05/25/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.

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lecture 35 - EBIO 1220 General Biology Lecture 35 Ecosystem...

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