poster print size: microclimate affects mosquito body size...
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QuesBonHowdoesvariaBoninmicroclimateacrosslanduseaffectbodysizeinwildcaughtAedesalbopictus?
Hypothesis: temperatures inurbansitesarewarmer, leading tosmaller bodied wild caught mosquitoes from urban sites thanwildcaughtmosquitoesfromruralandsuburbansites Fig4.RuralsiteshavesmallerAe.albopictusmosquitoesthansuburbanandurbansites.Wetested
forsignificantdifferencesinmeanwinglengthacrosslanduseusingamixedeffectsmodelwithsiteasarandomeffect(p<0.001).
MicroclimateaffectsmosquitobodysizeNicoleSolano1;MichelleEvans2;CourtneyMurdock,PhD23
1AgnesScomCollege,Decatur,GA2OdumSchoolofEcology,UniversityofGeorgia,Athens,GA3DepartmentofInfecAousDisease,UniversityofGeorgia,Athens,GA
The Asian Tiger mosquito, Aedes albopictus, is an invasivemosquitovectorthatcantransmitupto27differentarboviruses.Since mosquitoes are small ectotherms, variaAons intemperature largely impact their physiology and potenAal totransmithumanpathogens.1Small changesdue tomicroclimateimpactmosquito lifehistory traits relevant for transmission (i.e.bodysize).Bodysize isan indicatorof fecundityandpopulaAongrowth; thereforeunderstanding the effect ofmicroclimate caninformsmall-scalevariaAonindiseasetransmission.
IntroducBon
• Rural,urban,andsuburbansiteswerechosenbasedonpercentageofimpervioussurface
• PlacedoneBG-SenAneltrappersite• Trappedmosquitoesweeklyfortwotrapnightsforatotalof90trapnights
• FrozemosquitoesandidenAfiedthem.IffemaleAe.albopictus,wingwasmountedandmeasured
• CollectedtemperatureandrelaAvehumiditydataofeachsite’smicroclimate
Methods
• Microclimatediffersacrosslandusewithurbansitesbeingwarmer
• Winglengthdiffersacrosslandusewithruralsitesbeingsmaller
• Contrarytothesemi-fieldstudyfrom2015,wefoundthatwinglengthincreaseswithtemperature
• Suggestsotherfactors(e.g.larvalhabitatquality,larvalcompeAAon)mayhaveastrongereffectonbodysize
Conclusion
• PairadultsurveydatawithlarvalsurveydatatotestforarelaAonshipbetweenhabitatavailabilityandadultabundance
• ExploreeffectsoflanduseandmicroclimateonAedesalbopictusabundanceandcommunitydominance
• Testwatersamplesfromlarvalhabitat
Results
Fig3.Ruralsitesaresignificantlycoolerthansuburbanandurbansites.Wetestedforsignificantdifferencesinmeantemperatureacrosslanduseusingamixedeffectsmodelwithsiteasa
randomeffect(p<0.001).
9sites
x 3
x 3
x 3 Fig2.Measuredwinglength
Acknowledgements
FutureWork
This material is based upon work supported by the NaAonal ScienceFoundaAonunderGrantNo.1156707.Wewould liketothankDianaDiazforallofherhelpinthefieldandthelab;KerriMiazgowiczandAshutoshPathakforalloftheirhumorandadvice;andPhyllisMcCannonforherhardwork inthe insectary and providing us with larvae. Thank you to everyone in theMurdockandBrindleylab!
Temperature across land use
Fig5.Urbansitesaresignificantlywarmerthanruralandsuburbansites.WetestedforarelaAonshipbetweenwinglengthandtemperatureusingamixedeffectsmodelwithsiteasarandomeffect
(p<0.001). SolidblacklineLinearrelaAonshipfoundbythemixedeffectsmodel.
Winglengthacrosslanduse
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Lastsummer,astudywasconductedto test the relaAonship betweenmicroclimateandbodysizeinasemi-field system. They found thatmosquitoes in urban sites weresignificantly smaller than those inruralsites;mostlikelyduetowarmertemperatures in urban sites.2 Tovalidate these findings in the field,weconductedfieldmosquitosurveysand quanAfied Ae. albopictus winglengthacrosslanduse.
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Average Temperature (C)
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Averagetemperatureandwinglength
y=0.041x+1.46
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References1. Murdock,etal.inprep.
2.Cator,L.J.,S.Thomas,K.P.Paaijmans,S.Ravishankaran,J.A.JusAn,M.T.Mathai,A.F.Read,M.B.Thomas,andA.Eapen.2013.Characterizingmicroclimateinurbanmalariatransmissionsexngs:acasestudyfromChennai,India.MalariaJournal12:1–1.
3.Angilleta,M.J.,T.D.Steury,andM.W.Sears.2004.Temperature,growthrate,andbodysizeinectotherms:fixngpiecesofalife-historypuzzle.IntegraAveandComparaAveBiology44:498–509.
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Fig1.UrbansiteshavesmallerAe.albopictusmosquitoesthanruralandsuburbansites(p<0.001).(Murdocketal.inprep)
Wingsizein2015semifieldexperiment
Wingsizein2015semi-fieldexperiment