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Spatially explicit estimation of occupancy, detection probability and survey effort needed to inform conservation planning

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dc.contributor.authorOlea, Pedro
dc.contributor.authorMateo Tomás, Patricia
dc.contributor.authorFrutos, Ángel de
dc.contributor.rorhttps://ror.org/02jjdwm75
dc.date.accessioned2024-07-08T13:15:43Z
dc.date.available2024-07-08T13:15:43Z
dc.date.issued2011
dc.description.abstractAim It is increasingly recognized the importance of accounting for imperfect detection in species distribution modelling and conservation planning. However,the integration of detectability into a spatially explicit frame has received little attention. We aim (1) to show how to develop distribution maps of both detection probability and survey effort required to reliably determine a species presence/absence and (2) to increase awareness of the spatial variation of detection error inherent in studies of species occurrence. Location North-western Spain. Methods We registered the presence/absence of the endangered Egyptian vulture (Neophron percnopterus) in 213 surveys performed in 40 of 104 territories once known to be occupied. We model simultaneously both detection probability and occurrence,using site occupancy modelling. With the resulting regression equations,we developed distribution maps of both detection probability and required sampling effort throughout the area. Results Of the studied territories,72.5% were detected as occupied,but after accounting for imperfect detection,the proportion of sites truly occupied was 79%. Detectability decreased in territories with higher topographical irregularity and increased with both the time of day of the survey and the progress of the season. Spatial distribution of detectability showed a mainly north-south gradient following the distribution of slope in the area. The likelihood of occupancy increased with rockier,less forested surface and less topographical irregularity within the territory. A minimum of five surveys,on average,are needed to assess,with 95% probability,the occupancy status of a site,ranging from ?3 to >24 visits/territory depending on survey- and site-specific features. Main conclusions Accounting for detectability and its sources of variation allows us to elaborate distribution maps of detectability-based survey effort. These maps are useful tools to reliably assess (e.g. with 95% probability) occupancy status throughout a landscape and provide guidance for species conservation planning. © 2011 Blackwell Publishing Ltd.
dc.description.keywordDetection probability
dc.description.keywordMonitoring programmes
dc.description.keywordNeophron percnopterus
dc.description.keywordPresence-absence
dc.description.keywordSite occupancy modelling
dc.description.keywordSpecies distribution models
dc.formatapplication/pdf
dc.identifier.citationOlea, P. P., & Mateo?Tomás, P. (2011). Spatially explicit estimation of occupancy, detection probability and survey effort needed to inform conservation planning. Diversity and Distributions, 17(4), 714-724.
dc.identifier.doihttps://doi.org/10.1111/j.1472-4642.2011.00777.x
dc.identifier.issn13669516
dc.identifier.officialurlhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-79958139942&doi=10.1111%2fj.1472-4642.2011.00777.x&partnerID=40&md5=de60842c0c32049da2a04daeffa250ab
dc.identifier.urihttps://hdl.handle.net/20.500.14417/3220
dc.issue.number4
dc.journal.titleDiversity and Distributions
dc.language.isoeng
dc.page.final724
dc.page.initial714
dc.page.total9
dc.relation.entityIE University
dc.relation.schoolIE School of Science & Technology
dc.rightsAttribution 4,0 International
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.keywordDetection probability
dc.subject.keywordMonitoring programmes
dc.subject.keywordNeophron percnopterus
dc.subject.keywordPresence-absence
dc.subject.keywordSite occupancy modelling
dc.subject.keywordSpecies distribution models
dc.subject.otherbiological survey
dc.subject.otherconservation planning
dc.subject.otherdetection method
dc.subject.otherecological modeling
dc.subject.otherendangered species
dc.subject.otherestimation method
dc.subject.otherlandscape ecology
dc.subject.otherpopulation distribution
dc.subject.otherraptor
dc.subject.otherregression analysis
dc.subject.othersampling
dc.subject.otherspatial analysis
dc.subject.otherspatial variation
dc.subject.otherspecies conservation
dc.subject.othertopography
dc.subject.otherSpain
dc.subject.otherNeophron percnopterus
dc.titleSpatially explicit estimation of occupancy, detection probability and survey effort needed to inform conservation planning
dc.typeinfo:eu-repo/semantics/article
dc.version.typeinfo:eu-repo/semantics/publishedVersion
dc.volume.number17
dspace.entity.typePublication
person.identifier.scopus-author-id7801594197
person.identifier.scopus-author-id26432828500
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