时文拓展阅读50鲨鱼的未来生存还是灭亡.docx
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1、时文阅读I鲨鱼的未来一一生存还是灭亡众所周知,鲨鱼是海洋世界的霸主,对维持海洋的生态平衡起着至关重要的作用。而一项新的研究发现,大白鲨和鲸鲨将在下个世纪成为濒临灭绝的鲨鱼物种。这再次提醒我们,物种灭绝速度加快的背后,人类活动该怎样加以节制,才能在最大程度上减少对自然的干预阅读短文并回答问题Greatwhitesandwha1esharksareamongthespeciesatriskofextinctionoverthenextcentury,anewstudyhasfound.Pimientoisthe1eadauthorofastudypub1ishedinScienceAdvances
2、that1ooksathowtheextinctionof1argemarine(海洋的)specieswou1dimpacttheeco1ogica1ro1esofoceanecosystems.Theextinctioncrisischa11engesscientiststobettermeasurebiodiversity:howwi11thetota1varietyof1ifeonEarthbeaffectedashumanactivities1eadtothe1ossesofmoreandmorespecies?”theysaid.Intheoceans,thebiggestanim
3、a1sarethoughttop1aycrucia1eco1ogica1ro1es,andarea1sofacinghigh1eve1softhreatfromhumanactivitiessuchasfisheriesandc1imatechange.Theteamwas1ookingtomovebeyondtraditiona1speciesextinctions,tofindoutmoreaboutthefunctiona1diversity,therangeofro1esthatthesespeciesperform,andhowbiodiversitymightrespondunde
4、rdifferentextinctionscenarios(预测).Theyrantwodifferentextinctionscenarios.Inone,researchers1ookedatextinctionprobabi1itybasedontheircurrentIUCN(Internationa1UnionforConservationofNature)status.Inthesecond,theyassumeda11species1istedasthreatened,around40percent,hadgoneextinct.Sharkswerefoundtobeoneoft
5、heworstaffectedgroups.Wea1readyknewthatsharksareoneofthemostthreatenedgroupsintheocean,theysaid.Theyarea1soveryvu1nerab1eduetotheir1argesizeand1owreproductiverate.Ourresu1tsshowthatfutureextinctionswou1dbese1ectiveagainstthemostfunctiona11yuniqueandspecia1izedsharkspecies,resu1tingingreaterprojected
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