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Lecture 37

BIOLOGY 1M03 Lecture Notes - Lecture 37: Restoration Ecology, Habitat Destruction, Holocene ExtinctionPremium


Department
Biology
Course Code
BIOLOGY 1M03
Professor
Jon Stone
Lecture
37

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BIOLOGY1M03Lecture37BiodiversityandConservationBiology(Continued)
Review:
● Biodiversityisquantifiedatthelevelofallelicdiversity,speciesdiversity,and
ecosystemdiversity
○ Geneticdiversityiswellcharacterizedwithinsomespecies
○ Researchontotalnumberofspeciesisatapreliminarystage,with
estimatesrangingfrom10to100million
● Accordingtorecentanalyses,thesixthmassextinctioninthehistoryoflifeis
occurringduetohabitatloss,overexploitation,andglobalclimatechange
○ Accordingtodataontheratesofextinctioninbirdsandother
wellstudiedgroups,itislikelythat60percentofallspecieswillbe
wipedoutwithin500years
● Humansdependonbiodiversityfortheproductsthatwildspeciesprovideand
forecosystemservicesthatprotectthequalityoftheabioticenvironment
○ Speciesdiversityisimportantformaintainingtheproductivityof
naturalecosystemsandtheirabilitytobuildandholdsoil,moderate
localclimates,retainandcyclenutrients,retainsurfacewaterand
rechargegroundwater,preventfloodingandproduceoxygen
● Solutionstothebiodiversitycrisisincludeprotectingkeyhabitats,lowering
humanpopulationgrowthandresourceuse,restoringecosystems,mitigating
climatechange,andsupportingsustainabledevelopment.
○ Majorthreatstobiodiversity
■ Habitatdestruction
■ Climatechange
● Climatechangewillnotlessenuntilhumanpopulation
stabilizesandresourceusebecomessustainable
○ Ecosystemrestorationeffortsarehavingapositiveimpacton
biodiversityaroundtheworld
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