Scale Resonance: Effects of spatial scales on the inference of drivers behind species distribution

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dc.contributor.advisorHui, Cang
dc.contributor.advisorRamanantoanina, Andriamihajaen_ZA
dc.contributor.authorAtuhaire, Fatumah
dc.contributor.otherStellenbosch University. Faculty of Science. Dept. of Mathematical Sciences.en_ZA
dc.date.accessioned2017-06-26T13:59:55Z
dc.date.accessioned2017-12-11T10:27:03Z
dc.date.available2019-07-03T03:00:06Z
dc.date.issued2017-12
dc.descriptionThesis (MSc)--Stellenbosch University, 2017.en_ZA
dc.description.abstractENGLISH ABSTRACT: The factors that determine species distributions across landscapes have for long served keen interest to conservation biology. Abiotic factors have been the major determinants of species distribution at larger scales whereas biotic factors have been considered to be at small scales. The effect of a factor at one scale cannot be extrapolated to other scales. So to understand these effects,we need to make comparisons at multiple scales. Although there has been several progressive research studies done on the effects of spatial scales on species distributions, empirical studies involving varying more than one factor have been lacking. I develop a model that uses two factors of growth rate and carrying capacity as the key drivers of species distribution in a landscape. Each factor here has its own spatial autocorrelation and species’ responses to these factors vary as the spatial scales increase from local to regional to global scales. I represent these factors as two fractal landscapes and implement an integro difference equation (IDE) on them. The results obtained tell us how the population density is dependant on the growth rate and carrying capacity. Keywords: Spatial scale; fractal landscape; spatial autocorrelation; integro difference equations; hierarchical partitioning.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Die faktore wat die verspreiding van spisies oor landskappe bepaal, was vir lank ’n belangstelling van bewaringsbiologie. Abiotiese faktore beïnvloed hierdie verspreiding op die groot skaal, terwyl biotiese faktore vir die kleiner skaal in ag geneem moet word. Die effek van ’n faktor by een skaal kan nie geëkstrapoleer word na ’n ander skaal nie, so om hierdie effekte te verstaan, moet ons hulle op verskeie skale vergelyk. Alhoewel daar ’n hele paar progressiewe navorsingstudies oor die uitwerking van ruimtelike skale op die verspreding van spesies gedoen is, ontbreek ’n empiriese studie waar meer as een faktor op ’n slag verander word. Ek ontwikkel ’n model wat die twee faktore van groeikoers en drakrag gebruik as die sleutelbestuurders van die verspreiding van spesies in ’n landskap. Elke faktor het hier sy eie outo-korrelasie en spesies se antwoorde tot hierdie faktore wissel soos die ruimtelike skale van plaaslik na streek na globaal vergroot. Ek stel hierdie faktore as twee landskappe voor en implenmenteer ’n integro versil (Eng. IDE) model op hulle. Die resultsate wat verkry word, vertel ons hoe die bevolkingsdigtheid afhanklik is van die groeitempo en drakrag. Ruimtelike skaal; fraktale landskap; ruimtelike outokorrelasie; integro verskilvergelykings; hiërargiese verdeling.af_ZA
dc.description.versionMastersen_ZA
dc.embargo.terms2019-07-03
dc.format.extentix, 67 pages : illustrationsen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/102574
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch University.en_ZA
dc.rights.holderStellenbosch University.en_ZA
dc.subjectSpatial scalesen_ZA
dc.subjectSpecies distributionen_ZA
dc.subjectScale resonanceen_ZA
dc.subjectConservation biologyen_ZA
dc.subjectSpacial analysis (Statistics)en_ZA
dc.subjectBiogeographyen_ZA
dc.subjectUCTD
dc.titleScale Resonance: Effects of spatial scales on the inference of drivers behind species distributionen_ZA
dc.typeThesisen_ZA
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