IMPACTS OF WEIGHTING SCHEMES AND TRANSFORMED ENVIRONMENTAL VARIABLES ON BIODIVERSITY MODELING WITH PRESENCE-ONLY DATA

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dc.contributor.advisorFitzpatrick, Matthew Cen_US
dc.contributor.authorPradhan, Kavyaen_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2018-01-23T06:38:00Z
dc.date.available2018-01-23T06:38:00Z
dc.date.issued2017en_US
dc.description.abstractBiodiversity modeling techniques at the community- and species-level can be used to address questions in ecology, management, and conservation. I addressed aspects of community-level and specie-level models using virtual and inventoried species in North and South America. Firstly, I assessed the effectiveness of two weighting schemes in reducing impacts (if any) of five sampling routines (simulating unrepresentative sampling in presence-only data) on the model performance of Generalized dissimilarity model (GDM). Unrepresentative sampling lowers model performance, but weighting species can reduce this negative impact to a certain extent. However, PO data severely impacts GDM’s ability to detect the relative contribution of environmental gradients. Secondly, I examined the potential of (GDM) transformed environmental variables in improving the performance of Maxent models (presence-only) along with the influence of range size, sample size, and species dependence type. Transformed environmental variables improved model performance, especially when used with small-ranged species and/or low sample sizes.en_US
dc.identifierhttps://doi.org/10.13016/M2PG1HQ2N
dc.identifier.urihttp://hdl.handle.net/1903/20328
dc.language.isoenen_US
dc.subject.pqcontrolledEcologyen_US
dc.subject.pquncontrolledbiodiversityen_US
dc.subject.pquncontrolledclimate changeen_US
dc.subject.pquncontrolledforest inventory analysisen_US
dc.subject.pquncontrolledgeneralized dissimilarity modelingen_US
dc.subject.pquncontrolledspecies distribution modelingen_US
dc.subject.pquncontrolledvirtual speciesen_US
dc.titleIMPACTS OF WEIGHTING SCHEMES AND TRANSFORMED ENVIRONMENTAL VARIABLES ON BIODIVERSITY MODELING WITH PRESENCE-ONLY DATAen_US
dc.typeThesisen_US

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