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Chapter 3

Bio Ch30 (got 96%)

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Department
Biological Sciences
Course
BIOL 1001
Professor
All Professors
Semester
Winter

Description
Chapter30ConservationofBiodiversityConservationbiologyisdedicatedunderstandingandpreservingearthsbiologicaldiversityBiodiversitytheamazingvarietyoflivingorganismsthatinhabitEarth710millionspeciesareestimatedtoexist15millionarenamedMostarenamedspeciesareanimalsbutmostoftheorganismsareprobablynotanimalsEcosystemServicesFig301EcotourismValueofecosystemservicesIn1997aninternationalteamcalculatedthatecosystemservicesprovide33trillioninbenefitstohumanityyearlytwicetheworldsgrossnationalproductThe2005anotherteamconcludedthat60ofallearthsecosystemservicesarebeingdegradedandusedinanunsustainablefashionEcologicaleconomicsisusedingovernmentplanningNewYorkCitywatersupplyfromtheCatskillsMountainsButitwasbeingpollutedbysewageandagriculturalrunoffCityofficialsdeterminedthatitwouldcostlesstoprotectthemountainecosystemthantobuildawaterpurificationplantThecitypurchasedlargetractsoflandkeepingtheminareasonablynaturalstateMostbiologistsbelievethathumanactivitiesarenowcausingasixthmassextinctionThecurrentextinctionrateis100to1000timesthebackgroundratepredictedintheabsenceofhumansintheabsenceofhumansThereareatleast17000threatenedanimalspeciesnowaccordingtotheIUCNInternationalUnionforConservingNature12ofallbirds21ofallmammalsFig30531ofallamphibians5ofreptilesThehumanecologicalfootprintestimatestheareaofEarthssurfaceneededfortheresourcesweuseandtoabsorbthewastesthatwegenerateBiocapacitythecapacityoftheEarthtoprovideresourcesandabsorbwastesIn2005theEarthhadabout52acresforeachofthe65billionpeoplebuttheaveragehumanfootprintwas67acres
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