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BIO 101 Week 3 Individual Assignment Evolution Lab

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Running head: EVOLUTION LAB 1 Evolution Lab BIO/101 Universit o! hoeni# Evolution Lab The e#$eri%ent &as tested over a $eriod o! one hundred to three hundred ears' In the e#$eri%ent the !in(hes on )ar&in and *alla(e Island de%onstrated the a!!e(t o! $re(i$itation levels to the bea+ si,e' *ithin the e#$eri%ent levels o! rain!alls a!!e(ted the !in(hes- bea+ si,e. as &ell as the $o$ulation over ti%e' The level o! rain!all (ontrols the t$es o! seeds the birds eat' /ore rain!all (r
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  Running head: EVOLUTION LAB1Evolution LabBIO/101Universit o! hoeni#  Evolution Lab The e#$eri%ent &as tested over a $eriod o! one hundred to three hundred ears' In the e#$eri%ent the !in(hes on )ar&in and *alla(e Island de%onstrated the a!!e(t o! $re(i$itation levels to the bea+ si,e' *ithin the e#$eri%ent levels o! rain!alls a!!e(ted the !in(hes- bea+ si,e. as &ell as the $o$ulation over ti%e' The level o! rain!all (ontrols the t$es o! seeds the birds eat' ore rain!all (reates s%aller. so!ter seeds' Less rain!all (reates harder. larger seeds' The e#$eri%ents sho&ed over ti%e. the birds on the island &ith the least a%ount o!  $re(i$itation had larger bea+s' The birds- bea+s &ere larger be(ause the ada$ted to the ne& t$eo! !ood sour(e o! larger. harder seeds' The $o$ulation o! the !in(hes on )ar&in Island &as (onsiderabl larger !or the !irst t&o hundred ears' The $o$ulations &ere al%ost identi(al even though the bea+ si,es &ere dra%ati(all di!!erent' This e#$eri%ent $rovided data that $roved the  $re(i$itation levels a!!e(ted the bea+ si,es and the $o$ulation o! !in(hes' The variables (hosen to %ani$ulate !or the !irst run &as the $re(i$itation levels' That &as the onl $ara%eter (hanged and re%ained (onstant !or three hundred ears' The e#$eri%ent in(reased $re(i$itation level on )ar&in Island to 0'0 (% !ro% 0'0 (%' The $re(i$itation level on *alla(e Island &as redu(ed !ro% 0'0 (% to 10'0 (%' The e#$eri%ent &as (ondu(ted over a three hundred ear s$an to %easure the a!!e(ts to bea+ si,e' 2e(ond e#$eri%ent $ara%eters (hanged the island si,e and $re(i$itation levels to %easure ho& the (o%bination o! variables a!!e(ted bea+ si,e and $o$ulation' The si,e o! *alla(eIsland &as in(reased !ro% 0'3 +% to 1'0 +%' and no (hange to the $re(i$itation level' )ar&in Island si,e re%ained the sa%e at 0'3 +% but the level o! $re(i$itation &as in(reased !ro% 0'0 (% to 30'0 (%' The e#$eri%ent &as (ondu(ted over a three hundred ear s$an &ith the sa%e  $ara%eters to %easure the a!!e(ts to bea+ si,e over ti%e'  The last e#$eri%ent $ara%eter (hanges &ere also to the island si,e and $re(i$itation levels' )ar&in and *alla(e Island si,e &ere in(reased !ro% 0'3 +% to 1'0 +%' 4o&ever. the  $re(i$itation levels &ere (hanged to 0'0 (% !ro% 0'0 (% on )ar&in Island and redu(ed on *alla(e Island !ro% 0'0 (% to 10'0 (%' This e#$eri%ent $rovided the %ost drasti( results in  bea+ si,e over a three hundred ear s$an' The $o$ulations o! the birds &ere al%ost the sa%e nu%ber a!ter t&o hundred ears' But. the bea+ si,es &ere %ar+edl dissi%ilar' A((ording to the data. in the ear 10. the $o$ulation o! both islands had a di!!eren(e o! onl 15 birds' 4o&ever. the bea+ si,e !or the )ar&in Island !in(hes &as 15'56 %% and the *alla(e Island !in(hes had  bea+ si,es o! '5 %%The data su$$orted the theor that less rain!all !a(ilitated the gro&th o! the !in(hes-  bea+s' This ada$tation to the bea+ si,e is re7uired !or survival o! the birds' The lo&er levels o!  $re(i$itation (reate harder. larger seeds' The birds- bea+s %ust be(o%e larger and stronger to eat the seeds' The $o$ulation o! the birds on *alla(e Island is %u(h lo&er than )ar&in Island in the !irst 18 ears in the !irst run' It ta+es the birds that long to ada$t to their ne& environ%ent' Then. in the ear 13. there is onl 80 bird-s di!!eren(e bet&een the island $o$ulations' The results o! the e#$eri%ents de%onstrate the e!!e(t o! rain!all levels has on bea+ si,es o! birds' The data su$$orts the h$otheses that over ti%e the birds (an ada$t to less or %ore levels o! $re(i$itation in their environ%ent' The $o$ulation is adversel a!!e(ted until the birds  be(o%e ada$ted' A!ter %an ears o! evolving. the birds are able to in(rease their $o$ulation under the sa%e (onditions that !irst i%$a(ted the $o$ulation' The %ost stri+ing !a(t dis(overed &as that the greater the rain!all level. the s%aller the bea+ si,e' 4o&ever. the bea+ si,e does in(rease !or both island $o$ulations over ti%e'  The e#$eri%ents ran &ere interesting and !un to %ani$ulate' 9onsidering the !a(t &ith less $re(i$itation. the *alla(e Island !in(hes &ere not onl able to survive but also in(reased their $o$ulation under the sa%e (onditions' The )ar&in Island !in(hes had %ore rain!all that hadlittle or no i%$a(t on $o$ulation or bea+ si,e over ti%e' Ea(h island $o$ulation o! birds. ada$ted to their (hanging environ%ents over a $eriod o! 600 ears to in(rease their bea+ si,es and  $o$ulations under these (onditions' In (on(lusion. the !inal results &ere the lo&er levels o! $re(i$itation the bea+s o! these !in(hes &ill evolve and be able to eat the harder. larger seeds' There!ore. the ada$ted. survived and !lourished in their ne& environ%ent'aterials used to (ondu(t this e#$eri%ent &ere a (o%$uter. and a((ess to the Evolution Lab on the Universit o! hoeni# &ebsite' Unable to i%$ort data !or variables ran in e#$eri%ents;

Chn Notes

Jul 23, 2017
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