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3.3 Threats to Biodiversity (Pages100-109)

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Page 1: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

3.3ThreatstoBiodiversity(Pages100-109)

Page 2: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

LearningGoals

•Icanexplainhowbiodiversityisthreatenedbyhabitatloss,alienspecies,overexploitation,disruptingconnectivityacrossecosystemsandextinction.•Icanexplainhowbiodiversityisbeneficialtohumans.•Icansuggestwaystopreservebiodiversity.

Page 3: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

KeyConcepts•Threatstobiodiversityincludehabitatloss,theintroductionofalienspecies,overexploitation,andbreakingtheconnectivityamongecosystems.•Deforestationanddrainingwetlandscanresultinhabitatloss.•VIDEO:ZebraMussels

Page 4: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

KeyConcepts

•ExtinctionisanaturaleventthathasoccurredthroughoutEarth’shistory.•Currentextinctionratesmaybeacceleratedduetohumanactivities.

Page 5: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

HabitatLoss

•HABITATLOSS:thedestructionofhabitats,whichusuallyresultsfromhumanactivities•Examples•Deforestation•DrainingWetlands

Page 6: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Deforestation•DEFORESTATION:thepracticeofclearingforestsforloggingorotherhumanuses,andneverreplantingthem

Page 7: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

DrainingWetlands

•Wetlands:areasoflandthatarecoveredbywaterforpartoralloftheyear• Importantecosystemformanydifferentspecies•Coverabout14%ofCanada'stotallandarea

Page 8: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

ImportanceofWetlands

Page 9: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

AlienSpecies

•ALIENSPECIES:aspeciesthatisaccidentallyordeliberatelyintroducedintoanewlocation• INVASIVESPECIES:aspeciesthatcantakeoverthehabitat ofnativespecies•AliensHaveLandedI•AliensHaveLandedII

Page 10: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

ZebraMussels:AnInvasiveSpecies

Zebramusselswereeatingmostoftheshrimp-likecrustaceanswhichareafoodsourceformanyfish,includingwhitefishandsmelt.Asthenumberofthesecrustaceanshasdeclined,sohavethenumbersofthesefish.Nativeclamsandmusselshaveexperiencedasignificantdeclineinnumbers,aszebramusselshaveoutcompetedwiththemforfood.

Page 11: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Practice

•Page109#1-8•Answerthefollowingquestions:

1. Whatisoverexploitation?2. Howcandisruptinganorganismthatexistsin

multipleecosystemseffectconnectivity?3. Whatisextinction?Whataresomecausesof

extinction?•Read“TheZebraMussel”handout• Socrative3.3miniquiz

Page 12: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Overexploitation•OVEREXPLOITATION: theuseorextractionofaresourceuntilitisdepleted•ThereducedcatchofAtlanticcodreflectsadecreaseinpopulationasaresultofoverexploitation

Page 13: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

DisruptingConnectivityAcrossEcosystems

• Somespeciesareresponsibleforsustainingmultipleecosystems

Page 14: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Extinction

•EXTINCTION: thedeathofalltheindividualsofaspecies

•Backgroundextinctionà slow,steady,minorchanges•Massextinctionà sudden,rapid,majorchanges•Biodiversitycrisis:thecurrentacceleratedrateofextinctions

Page 15: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Somecausesofextinctionare:• Overhunting• Climatechange• Largemeteorimpacts• Disease• Invasivespecies• Urbansprawlandlossofhabitat

Page 16: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Thepassengerpigeon isanextinctNorthAmericanbird.ItwasoncethemostabundantbirdinNorthAmerica,andpossiblytheworld. ItaccountedformorethanaquarterofallbirdsinNorthAmerica.Thespecieslivedinenormousmigratoryflocksuntiltheearly20thcentury,whenhuntingandhabitatdestructionledtoitsdemise.

Oneflockin1866insouthernOntariowasdescribedasbeing1.5 kmwideand500 kmlong,took14hourstopass,andheldinexcessof3.5billionbirds.

Potentialde-extinctionSomehavesuggestedcloningthepassengerpigeoninthefuture.De-extinction effortsarenowunderwaytorevivethespeciesbyextractingDNAfragmentsfrompreservedspecimens,andlater,usingband-tailedpigeonsassurrogateparents.[

Page 17: 3.3 Threats to Biodiversity - Weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/3.3...3.3 Threats to Biodiversity (Pages100-109) Learning Goals •I can explain how biodiversity

Practice

•Page109#1-8• Socrative3.3miniquiz• ProjectDUETHURSDAY(model),FRIDAY(writtenpiece)!


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