Chapter 42 - 42 ECOSYSTEMS ChapterOutline IMPACTS,ISSUES:BYEBYE,BLUEBAYOU 42. Overview oftheParticipants 42.2THENATUREOFFOOD WEBS How Many

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42 ECOSYSTEMS Chapter Outline IMPACTS, ISSUES: BYE-BYE, BLUE BAYOU 42.1 THE NATURE OF ECOSYSTEMS Overview  of the Participants Structure of Ecosystems 42.2 THE NATURE OF FOOD WEBS How Many Transfers? 42.3 BIOLOGICAL MAGNIFICATION IN  FOOD WEBS 42.4 STUDYING ENERGY FLOW THROUGH  ECOSYSTEMS What Is Primary Productivity? Ecological Pyramids Ecological Efficiency 42.5 BIOGEOCHEMICAL CYCLES 42.6 THE WATER CYCLE How and Where Water Moves A Global Water Crisis 42.7 CARBON CYCLE 42.8 GREENHOUSE GASES, GLOBAL  WARMING 42.9 NITROGEN CYCLE Impacts into Ecosystems Natural Losses from Ecosystems Disruptions by Human Activities 42.10 PHOSPHORUS CYCLE SUMMARY SELF-QUIZ CRITICAL THINKING Objectives 1. Understand  how  materials and  energy enter, pass through, and  exit an ecosystem.  2. Understand  how  ecosystems are organized  and  the various trophic roles and  levels. 3. Describe the movement  of materials through  the biogeochemical cycles. Key Terms ammonification aquifer atmospheric cycle biogeochemical cycles biological magnification biomass pyramid   carbon cycle carbon-oxygen cycle carnivores condensation consumers decomposers denitrification desalinization detrital food web detritivores ecosystem energy pyramid eutrophication evaporation food chain food web fungicides global warming grazing food web greenhouse  effect groundwater herbicides herbivores hydrologic cycle insecticides net ecosystem   production nitrification nitrogen  cycle nitrogen  fixation omnivores parasites phosphorus  cycle precipitation primary  producers primary  productivity runoff salinization sedimentary  cycle transpiration trophic levels watershed Ecosystems 133
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Lecture Outline Impacts, Issues: Bye-Bye, Blue Bayou A. Louisiana is losing its wetlands. 1. Ocean levels are rising, and  sediments are being held back by dams and  levees rather  than  flowing into the sea to replace those washed  away. 2. The shellfish, fish, and  migratory birds are losing habitat each year. B. Warmer temperatures will also have effects on Louisiana. 1. Algal blooms will cause fish kills; bacteria will make animals sick.  2. Mosquitoes will thrive and  transmits diseases, like West Nile virus. 3. Weather patterns may be affected; floods will alternate with drought. 42.1 The Nature  of Ecosystems A. Overview  of the Participants 1. All ecosystems share some fundamental  aspects of their structure  and  function.  Ecosystems are defined  by the array of organisms that exist in the physical environment,  interacting through  a one-way flow of energy and  a cycling of nutrients. 2.
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This note was uploaded on 03/07/2011 for the course BIOL 1409 taught by Professor Staff during the Spring '11 term at Dallas Colleges.

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Chapter 42 - 42 ECOSYSTEMS ChapterOutline IMPACTS,ISSUES:BYEBYE,BLUEBAYOU 42. Overview oftheParticipants 42.2THENATUREOFFOOD WEBS How Many

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