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dc.contributor.authorFitzpatrick, Matthew
dc.contributor.authorPreisser, Evan
dc.contributor.authorEllison, Aaron
dc.contributor.authorElkinton, Joseph
dc.date.accessioned2009-06-29T18:14:10Z
dc.date.issued2009
dc.identifier.citationFitzpatrick, Matthew C., Evan L. Preisser, Aaron M. Ellison, and Joseph S. Elkinton. Forthcoming. Observer bias and the detection of low-density populations. Ecological Applications 19.en
dc.identifier.issn1051-0761en
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3123278
dc.description.abstractMonitoring programs increasingly are used to document the spread of invasive species in the hope of detecting and eradicating low-density infestations before they become established. However, interobserver variation in the detection and correct identification of low-density populations of invasive species remains largely unexplored. In this study, we compare the abilities of volunteer and experienced individuals to detect low-density populations of an actively spreading invasive species and we explore how interobserver variation can bias estimates of the proportion of sites infested derived from occupancy models that allow for both false negative and false positive (misclassification) errors. We found that experienced individuals detected small infestations at sites where volunteers failed to find infestations. However, occupancy models erroneously suggested that experienced observers had a higher probability of falsely detecting the species as present than did volunteers. This unexpected finding is an artifact of the modeling framework and results from a failure of volunteers to detect low-density infestations rather than from false positive errors by experienced observers. Our findings reveal a potential issue with site occupancy models that can arise when volunteer and experienced observers are used together in surveys.en
dc.description.sponsorshipOther Research Uniten
dc.language.isoen_USen
dc.publisherEcological Society of Americaen
dc.relation.isversionofhttp://esapubs.org/esapubs/journals/applications.htmen
dash.licenseLAA
dc.subjectvolunteeren
dc.subjectsurveyen
dc.subjectsite occupancy modelsen
dc.subjectoccurence probabilityen
dc.subjectmonitoringen
dc.subjectinvasive speciesen
dc.subjecthemlock wooly adelgiden
dc.subjectcitizen scienceen
dc.titleObserver Bias and the Detection of Low-Density Populationsen
dc.relation.journalEcological Applicationsen
dash.depositing.authorEllison, Aaron
dc.identifier.doi10.1890/09-0265.1
dash.contributor.affiliatedFitzpatrick, Matthew
dash.contributor.affiliatedEllison, Aaron
dc.identifier.orcid0000-0003-4151-6081


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