monarch butterflyspecies status assessment update › savethemonarch › pdfs ›...
TRANSCRIPT
MonarchButterfly SpeciesStatusAssessmentUpdate
1
Inthiswebinar,IwillfocusontheregulatoryprocessthatismovingforwardandparalleltootherServiceprogramsthatareworkingcloselywithourpartnerstoimplementconservationactivitiesonthegroundformonarchbutterflies.
• Wewillbeprovidingaquickmonarchbiology101,• thenmoveintodiscussingthespeciesstatusassessment,• includingsomeofthemodelsandassumptionsweareusinginthemodels,• finishingwithaquestionandanswersession.
2
JustaquickMonarchBiology101
Monarchsundergocompletemetamorphosis,including4lifestages.
1) Eggs arelaidonmilkweedplantsandthenhatchinto2) thecaterpillarorlarvalstagewheretheyonlyconsumemilkweed.3) Fromtheretheygothrough5instarsandeventuallyenterthepupaorchrysalisstage.
Theyareinthisstageforapproximately10-14daysbefore…4) eclosing intoanadult.Unlikethecaterpillar,adultsneedavarietyoffloweringplants
tonectaron.
Theentireprocessfromeggtoeclosing asabutterflytakesaboutamonth.
3
Here’samapoftherangewithinNorthAmerica.Thereare3populations:1)thewesternand2)easternpopulationsaremigratory,and3)theFloridapopulationisnon-migratory.
MonarchsoverwintereitheronthewestcoastoftheUnitedStatesorinMexico,dependingonthepopulationtheyarefrom.
Asmonarchsmovenorthoreastduringthebreedingseason,thislifecyclewejustdiscussedisrepeated4-5times,creating4-5generations.So,themonarchsthateventuallymovebacktoMexicoarethegreatgreatgrandchildrenofthemonarchsthatleftMexicoandstartedthecyclethatyear.
Interestingnotehereisthat,inMexico,acertainnumberofoverwinteringbutterfliesareneededtocreateamicroclimatethatallowsthemtosurvivethroughthewinterthentheymoveintotheeast– therefore,populationnumbersseemtobeanimportantaspect,giventhemicroclimateneeds,atleastintheeastandlikelyinthewestaswell.
4
Asyoucansee,withintheeasternpopulationwehaveseen20yearsofdecline.
5
Similarly– thewesternpopulationhasalsodeclined.Althoughthegraphmaylooklikeastablepopulation,thetotalsurveymonitoringefforthasincreasedfrom2009-present,whilemonarchabundancestayedrelativelythesame– whichgenerallyindicatesalowerabundance.
6
Here’saquickrecapofwhatImentionedearlier.
Duetothesepopulationdeclines,theServicewaspetitionedtolistthemonarchbutterflyundertheEndangeredSpeciesActinthesummerof2014.
Wecompleteda90-dayfindinginDecemberof2014anddeterminedthattherewassubstantiveinformationandweshouldcompletea12-monthfindingaswell.
However,duetoworkloadwedidnotcompletea12-monthfindingbythesummerof2015.WereceivedanoticeofintenttosueinJanuary2016.
WesettledwiththeCenterforBiologicalDiversityandtheCenterforFoodSafetyforfailingtomeetourstatutorydeadline;asettlementagreementoutlinedaduedateofJune,30,2019.
WeplantoworkonastatusreviewinthecomingyearswhichwillfollowtheService’sSpeciesStatusAssessmentframework.
Withthesettlementofthelawsuit,wenowhaveadeadlineofJune30,2019tohaveadraft12-monthfindingtotheFederalRegister.
7
Importantnote:thepetitionandultimatelythelistingdecision,wasforthesubspecies–whichrangesthroughoutawidearea,notjustNorthAmerica.
8
Importanttonoteonthetimeline:wedividedtheSSAintoprototype1(focusingjustonNorthAmerica)andprototype2(incorporatingtherestoftherange).
Herearesomecriticaldatestohighlightfromthetimelineabove.
• Webinars –• FirstweekNov.2016- Service• WeekofNov.7with the states and tribes
• March2017– Check-inmeetingwiththestates• Spring2017– ContinuewithPrototype2,includingreviewingthestatusintherest of
therangeandexpertelicitation.• Earlyspring2018– PeerreviewoftheDraftSSAReport• Earlysummer2018– Collectinformationfromstatesonformalconservationefforts–
likelythroughaconservationeffortsdatabase• June2019– listingdecisiondue
9
Thisframeworkprovidesawaytopiecetogetherthepuzzlethatreflectsthespecies’biologicalstatusthroughaniterative,ratherthanastrictlystep-by-step,analyticalprocess.
EssentiallytheSSAisananalyticalapproachforassessingaspecies’biologicalstatus.
1. Firstthingwearedoingisidentifyingspecies’needs.Inotherwords,compileinformationonthemonarch’slifehistoryandecologicalrelationships.
1. Evaluatethecurrentconditionofthespecies,identifyingthreats/stressors/influencesthatareactingonthespecies’needs.
1. Thenwewillprojectfutureconditions,byidentifyingthedifferencesbetweenwhatthespecieshasandwhatthespeciesneeds,andwhatthismeanstothespecies.
Thisleadstoanassessmentoftheoverallviabilityofthespecies.Viabilityistheabilitytosustainpopulationsinthewildovertime.
10
1. Toassessviabilityovertime,wearedeconstructingthequestionintothe3ConservationBiologyprinciplesofResiliency,RepresentationandRedundancy.
Briefly,1. Resiliencyistheabilityofthespeciestowithstandenvironmentalvariationand
stochasticevents.
1. Representationistheabilityofthespeciestowithstandphysicalandbiologicalchangesinitsenvironment,i.e.,adaptivecapacityofaspecies.
1. Redundancyistheabilityofthespeciestowithstandcatastrophicevents.
AsIdiscussedearlier,weareconductingtheSSAinphases.Thefirstphaseisaprototype.Weareworkingoutthemethodologies;indoingso,wearefocusingonNorthAmericanmonarchsandevaluating1futurescenario.We’lldiscussthismoreinthenextcoupleofslides.
Thesecondphase,prototype2,willbeamorecomprehensiveandrobustanalysis.Itwillexpandtorangewide,includeadditionalscenarios,andexpertinput.
11
Hereiswhatwehavedonethusfar….
ForRepresentation,• Wehavesearchedformonarch-specificinformationonsourcesofadaptivediversity,
lookingspecificallyforwhatecological,biologicaltraitsmightbesourcesofadaptivediversity.
12
Here’swhatwehavecomeupwithsofar...
AsInotedalready,thereare3populationsofmonarchswithinNorthAmerica;withinthesepopulations,we’veidentifiedvariationinadaptivetraits,allowingustodelineate6areas:
1. Floridaindividualsmayprovideuniqueadaptivediversityduetogeneticvariation.
2. Thewesternandeasternunitsmayprovideuniqueadaptivediversityprimarilyduetodifferencesinmigratorybehavior.
3and4.WithintheEasternunit,thenorthernportionmayprovideuniquenessduetotheperformancetraitsassociatedwithlong-distancemigration.
Andfinally,5and6,theover-winteringunitsinMexicoandCaliforniaduetodifferencesinwinterhabitatniches.
Ouranalysis,thusfar,indicatesthattheindividualmonarchsinthese6areasmayprovideuniqueadaptivepotential.Ouranalyseswilllookatlikelihoodofmaintainingmonarchswithinthe3populationsthatareseparatedintothese6areasovertime.
WearegoingtodothisbyevaluatingthespeciesResiliencyandRedundancy,givenvariousfuturescenarios.
13
WeareevaluatingResiliencybylookingatthepopulation(N)overtime:historically,currentlyandintothefuture- ineachofthe3populations
• Welookedatvariousexistingpopulationmodelsandhadhopedtouseoneofthepublishedmodels.
• However,thoughtheyallgiveaprojectionofpopulationnumber(N)basedoncurrentconditions,noneanswerthequestionofwhathappenstothepopulation(N)givenreasonablefutureconditions(i.e.,stressorandconservationscenarios).
• Oberhauseretal.,2016attemptsthisbygenerically increasingordecreasingthepopulationgrowthrate(λ)byapercentage,butforthelistingassessmentweneedtodevelopplausiblefuturescenarios.
• So,weareusingastochasticgeometricgrowthmodelthatisverysimilartotheSemmensetal.,2016,withtheadditionofincorporatingtheeffectoffuturescenarios.
• Themodellooksatpopabundancenextyearasitisdeterminedbypopulation(N)thisyearmultipliedbypopgrowthrate.
• Popgrowthrate,(λ)ismodifiedbytheeffectofstochasticity(epsilon)andchangeinapopulationgrowthrate(λ)givenafuturescenario.
• WeareusingtheeffectofstochasticitythatSemmensetal.used• andthenderivingthechangeinpopgrowthratefromexpertinput.
• ForFuturescenarioswewillprojectthosefactors(thestressorsorthreats)thatareprimarilydrivingmonarchnumbers.
14
Thechangeinpopulationgrowthrateisbeingevaluatedin3futurescenarios:businessasusual,bettercaseandworsecase.
ForPrototype1,wejustdevelopedthe“businessasusual”scenario– ultimatelyweintendtodevelopatleast3futurescenarios.
BasedonliteratureandpreviousServiceefforts,weidentifiedtheprimarydrivers(orthreats)foreachpopulation.
Fortheeasternpopulation:• Changeinmilkweedandnectarabundance(positiveandnegative),insecticideexposure,
andchangesinoverwinteringhabitat;• Changesinmilkweedandnectarhabitat,wearelookingatfutureglyphosateuse,
conservationefforts,andclimatechange.Conservationefforts=changesinConservationReserveProgramenrollmentandcompatiblemanagementinrights-of-waysandprotectedgrasslands;and
• Changeinoverwinteringhabitatduetoclimatechangeandillegallogging.
Similarly,inthewesternpopulationwearelookingat:• Changeinmilkweedandnectarresources,insecticides,andlossofoverwinteringsites;• Changeinmilkweedandnectarresourcesduetolandcoverchanges- butlacking
sufficientdatatomodelclimatechangeandconservationefforts;and• Lossofoverwinteringsitesduetotreesenescence(treesdyingofoldage)andstorm
15
events.
Inthenon-migratorypopulation- evenfewerdataavailableforthispopulation:• Modelingchangeinmilkweedandnectarduetolandcoverchangesandinsecticide
exposure;and• Wehopetogetdataonclimatechangeandconservationefforts;however,ifwecannot,
wewilldevelop“reasonable”scenarios.
15
Redundancyistheextinctionriskovertimeduetothefrequencyofcatastrophicevents.
Eastern– stormeventsinMexicoWestern– catastrophicfireincoreoverwinteringsitesFlorida– massinsecticideevent
16
Thisseemstobeoneofthemostwell-studiedspecies,yetwelackspecificinformationonareasthatarenecessaryforarobustSSA:
• cause-effectrelationshipsbetweenparticularstressors(threats)andpopulationoutcomesorvitalratesarenotwellestablished;
• limitingfactorsarenotclearacrossallportionsoftherange;and• landscapeconservationdesignisachallengebecausewelackdataonconnectivityand
habitatconfigurationneeds.
17
18
MultipleFWSregionalrepresentativesleadtheeffort,inclosecoordinationwithstates.Wehave2staterepresentatives,KarenKinkeadandEdBoggessonthecoreteam.
19
20
21