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Lecture 6

EESC04H3 Lecture 6: Biodiversity Through Geological Time
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Department
Environmental Science
Course
EESC04H3
Professor
Sandy Smith
Semester
fall

Description
longer tine for speciation to occun n'tropi ca Aome spp. thot have ever exksted in polewaid ecosyatens (e.g pnesent day Arctic) still remain foda reater extinchion closen to the poles due to xtreme climate variabllity o eotoqicol time despife over 200yrs Atudying the latitudina gradient, still no Consenic why this patteh ocCun v. handto dis all potential explanati ons nern hypothesea, ov!tweak of old hypothase, Continue to p yapt, applied inpTi cahond of thisfattern eq.qiding Conaervotion (a Infornu σ ur understand i on biodliy enengy, femp., time A Apace explarationa or control inal divensity radient Oct 3 h tine issueA surrounating biodiversity of ten viewed aA a contemporary env )tal-issue,ん/cwv1 90aa documentin spp distribuction ng human impacts on cther spp biodivensity ia kay aapect differentiating evas Eanth i y in eótogical time current human impactson bi ooliveusity aua a ning feature 'in Eatth's 4.5 bilfon yr history human wipacts aie unprecedentedl in recent geological history things that have happened b e nappening time period ned lby buman mpacts on Eath's qeclo the last 40-So urs... thoukand of years i. alterathon ii. blodiveusity/spp nteractio r symptoms ae th we've changed ove几 t wavally tate ten nutrient cycea rte ol human-cauAe appre ciated w thinkinq alot. brodiv. through geolaical history (i.e illion yr) on bi odives ed on one declinen/extinction八ated to those occurring over lonq timé penoda on the othen, can appreciate how current biodiy. A a long-term reAudfof eveln over million』ge yrs , we can compare human -cauA 5 major extinchord ane we in the 6th one now? b/c 01 m? often wsed to piunpont As biologi cal story from $40-485 mya (lasted ss y) the Cambnan exploionof biodiv, but all ihe still und wate t in marine enviro eanly plants& aquatic ofe evotvea remember linaages pe of crustacean many 'are v Anall awre ttha envivo 0g UA longer tine for speciation to occun n'tropi ca Aome spp. thot have ever exksted in polewaid ecosyatens (e.g pnesent day Arctic) still remain foda reater extinchion closen to the poles due to xtreme climate variabllity o eotoqicol time despife over 200yrs Atudying the latitudina gradient, still no Consenic why this patteh ocCun v. handto dis all potential explanati ons nern hypothesea, ov!tweak of old hypothase, Continue to p yapt , applied inpTi cahond of thisfattern eq.qiding Conaervotion (a Infornu σ ur understand i on biodliy enengy, femp., time A Apace explarationa or control inal divensity radient Oct 3 h tine issueA surrounating biodiversity of ten viewed aA a contemporary env ) tal - issue , ん / cwv1 90aa documentin spp distribuction ng human impacts on cther spp biodivensity ia kay aapect differentiating evas Eanth i y in eótogical time current human impactson bi ooliveusity aua a ning feature 'in Eatth's 4.5 bilfon yr history human wipacts aie unprecedentedl in recent geological history things that have happened b e nappening time period ned lby buman mpacts on Eath's qeclo the last 40-So urs... thoukand of years i. alterathon ii. blodiveusity/spp nteractio r symptoms ae th we 've changed ove 几 t wavally tate ten nutrient cycea rte ol human-cauAe appre ciated w thinkinq alot. brodiv. through geolaical history (i.e illion yr) on bi odives ed on one declinen / extinction 八 ated to those occurring over lonq timé penoda on the othen, can appreciate how current biodiy. A a long - term reAudfof eveln over million 』 ge yrs , we can compare human -cauA 5 major extinchord ane we in the 6th one now ? b / c 01 m ? often wsed to piunpont As biologi cal story from $40-485 mya (lasted ss y) the Cambnan exploionof biodiv, but all ihe still und wate t in marine enviro eanly plants& aquatic ofe evotvea remember linaages pe of crustacean many 'are v Anall awre ttha envivo 0g UAfrom 490-440 mya (4S million yrs long wann climate nu, high atmospheric 01sture Content hallow wates can heot up to be v. warm first verte bratea; dominated by narine invertebra hrst plants appecn or era biodiversification in Earth history) up to 86% of -dea ertinchon event (3rl tangest Oirclivi Cian Extincticn wiped out due to climate Δ r-houndly, an ice age sea evel dlropped, 4 a cean chamistd in altered from 440-6 ya (24 million yr long) Coral 꼲 other invertebrated dominate land plants nsects first appear first evidence o on land aamp) water vascularr plarts ctart to evolve mation of Earth's cnut Atarts to or en owttainous areas Atart to forw As in elevati on more weatheri Devonian -from 416-360 mya/56 million yerlor Devonian seaA divelop eaun tetrapodi (first four-lin^ped vente brate) appear colonigation (and, buct o this pt.,the ane no organic solla only rock) モ Devonian --dea Δ develop a/Tund . (and mated . real vascular plants develop elan tr m GL ental A, likely owing to expand(n or or heductiond natmaspheric [Co] orた In nutrient to rivende.ectrophication) due to de caying organism reductond in02 masor exfinCtion ewent -from 360-300 mya (60 million yeans lona tropical & humid climate throughout rth fernd evergreen for eats vast expands amphibians insects divercify Llying iniects they're terrestrial or ac ation off
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