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dc.contributor.authorStevenson, Claire D.en
dc.contributor.authorWatts, Kevinen
dc.contributor.authorBellamy, Chloeen
dc.contributor.authorNevin, Owen T.en
dc.contributor.authorRamsey, Andrewen
dc.date.accessioned2015-12-21T11:10:41Zen
dc.date.available2015-12-21T11:10:41Zen
dc.date.issued2014-11en
dc.identifier.citationStevenson-Holt CD, Watts K, Bellamy CC, Nevin OT, Ramsey AD (2014) Defining Landscape Resistance Values in Least-Cost Connectivity Models for the Invasive Grey Squirrel: A Comparison of Approaches Using Expert-Opinion and Habitat Suitability Modelling. PLoS ONE 9(11): e112119. doi:10.1371/journal.pone.0112119en
dc.identifier.doi10.1371/journal.pone.0112119en
dc.identifier.urihttp://hdl.handle.net/10545/584271en
dc.description.abstractLeast-cost models are widely used to study the functional connectivity of habitat within a varied landscape matrix. A critical step in the process is identifying resistance values for each land cover based upon the facilitating or impeding impact on species movement. Ideally resistance values would be parameterised with empirical data, but due to a shortage of such information, expert-opinion is often used. However, the use of expert-opinion is seen as subjective, human-centric and unreliable. This study derived resistance values from grey squirrel habitat suitability models (HSM) in order to compare the utility and validity of this approach with more traditional, expert-led methods. Models were built and tested with MaxEnt, using squirrel presence records and a categorical land cover map for Cumbria, UK. Predictions on the likelihood of squirrel occurrence within each land cover type were inverted, providing resistance values which were used to parameterise a leastcost model. The resulting habitat networks were measured and compared to those derived from a least-cost model built with previously collated information from experts. The expert-derived and HSM-inferred least-cost networks differ in precision. The HSM-informed networks were smaller and more fragmented because of the higher resistance values attributed to most habitats. These results are discussed in relation to the applicability of both approaches for conservation and management objectives, providing guidance to researchers and practitioners attempting to apply and interpret a leastcost approach to mapping ecological networks.
dc.description.sponsorshipThis project was funded by the Forestry Commission GB and the National School of Forestry at the University of Cumbria. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.en
dc.language.isoenen
dc.publisherPLOSen
dc.relation.urlhttp://journals.plos.org/plosone/article?id=10.1371/journal.pone.0112119en
dc.relation.urlhttp://rsne.org.uk/sightingsen
dc.relation.urlhttp://www.cbdc.org.uk/en
dc.subjectLeast cost modellingen
dc.subjectGrey squirrelen
dc.subjectExpert opinionen
dc.subjectHabitat suitability modellingen
dc.titleDefining Landscape Resistance Values in Least-Cost Connectivity Models for the Invasive Grey Squirrel: A Comparison of Approaches Using Expert-Opinion and Habitat Suitability Modellingen
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.identifier.journalPLoS ONEen
refterms.dateFOA2019-02-28T14:04:47Z
html.description.abstractLeast-cost models are widely used to study the functional connectivity of habitat within a varied landscape matrix. A critical step in the process is identifying resistance values for each land cover based upon the facilitating or impeding impact on species movement. Ideally resistance values would be parameterised with empirical data, but due to a shortage of such information, expert-opinion is often used. However, the use of expert-opinion is seen as subjective, human-centric and unreliable. This study derived resistance values from grey squirrel habitat suitability models (HSM) in order to compare the utility and validity of this approach with more traditional, expert-led methods. Models were built and tested with MaxEnt, using squirrel presence records and a categorical land cover map for Cumbria, UK. Predictions on the likelihood of squirrel occurrence within each land cover type were inverted, providing resistance values which were used to parameterise a leastcost model. The resulting habitat networks were measured and compared to those derived from a least-cost model built with previously collated information from experts. The expert-derived and HSM-inferred least-cost networks differ in precision. The HSM-informed networks were smaller and more fragmented because of the higher resistance values attributed to most habitats. These results are discussed in relation to the applicability of both approaches for conservation and management objectives, providing guidance to researchers and practitioners attempting to apply and interpret a leastcost approach to mapping ecological networks.


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