Estimation of Species Area Abundance from Point Abundance Data, Using Effective Detection Areas from Camera Traps

Abstract

See, stats, and : https : / / www. researchgate . net / publication / 322315505 Estimation Point , Using Detection Article DOI : 10 . 4172 / 2332 - 2543 . 1000200 CITATION 1 READS 58 3 , including : Some : Mammalian Herpetological (emerging) View project Johanna - Margono Chester 27 SEE Martijn . A . Weterings Wageningen 12 SEE All . A . Weterings . The .AbstractEstimationsofspeciesabundanceareacommongoalofwildlifemonitoringsurveys,butdebateremainsastowhichmethodsaretheoreticallyandpracticallymostuseful.Abundance-inducedheterogeneity(AIH)modelsdevelopedintheearly2000sallowedestimationofpointabundancefromrepeatedpresence-absencedata(e.g.occupancymodels),andadvancedestimationofpointabundancesofunmarkedspecies.AIHmodels,however,donotprovideanestimateoftheeffectivedetectionareasampled.Thereforetheabsolutenumberofindividualsinasurveyareacannotbeestimateddirectly.Recently,methodshavebecomeavailabletodeterminetheeffectivedetectionareasampledbycameratraps.Ourobjectivewastopresentanovelmethodtoestimatetheabsolutenumberofindividualsofaspeciesinanareafrompointabundancedatausingeffectivedetectionareasfromcameratraps.ThiswouldmakeAIHmodelsavailableforpopulationestimates.WeappliedthisnewlydevelopedSpeciesAreaAbundance(SAA)modeltoa3-monthcameratrappingdatasetofBaweanwartypigs(Susblouchi)fromIndonesia,andcomparedtheresulttoanindependentRandomEncounterModel(REM)estimatefromthesamedata.PopulationsizesanduncertaintiesestimatedbytheSAAandtheREMmodelwerecomparable.DifferencesindensityestimationsbetweentheREMandSAAmodelwerenotsignificantwhenmeangroupsizewasincludedintheREM.ThelessrestrictiveassumptionsregardingcameratrapplacementoftheSAAmodelcomparedtotheREMmightmakeitmorepracticaltostudycrypticandunmarkedanimalpopulations.FurtherstudiesareneededtodeterminetheaccuracyandpracticalityoftheSAAmodelusingarangeofdifferrentsamplingdesignsandfocusspecies.