Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/680
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dc.contributor.authorJohnson, CNen
dc.contributor.authorVernes, KAen
dc.contributor.authorPayne, Aen
dc.date.accessioned2008-07-30T10:05:00Z
dc.date.issued2005en
dc.identifier.citationOecologia, 143(1), p. 70-76en
dc.identifier.issn0029-8549en
dc.identifier.urihttps://hdl.handle.net/1959.11/680en
dc.description.abstractWe compared demography of populations along gradients of population density in two medium-sized herbivorous marsupials, the common brushtail possum Trichosurus vulpecula and the rufous bettong Aepyprymnus rufescens, to test for net dispersal from high density populations (acting as sources) to low density populations (sinks). In both species, population density was positively related to soil fertility, and variation in soil fertility produced large differences in population density of contiguous populations. We predicted that if source–sink dynamics were operating over this density gradient, we should find higher immigration rates in low-density populations, and positive relationships of measures of individual fitness—body condition, reproductive output, juvenile growth rates and survivorship—to population density. This was predicted because under source–sink dynamics, immigration from high-density sites would hold population density above carrying capacity in low-density sites. The study included 13 populations of these two species, representing a more than 50-fold range of density for each species, but we found that individual fitness, immigration rates and population turnover were similar in all populations. We conclude that net dispersal from high to low density populations had little influence on population dynamics in these species; rather, all populations appeared to be independently regulated at carrying capacity, with a balanced exchange of dispersers among populations. These two species have suffered recent reductions in range, and they are ecologically similar to other species that have declined to extinction in inland Australia. It has been argued that part of the cause of the vulnerability of species like these is that they exhibit source–sink dynamics, and disturbance to source habitats can therefore cause large-scale population collapses. The results of our study argue against this interpretation.en
dc.languageenen
dc.publisherSpringeren
dc.relation.ispartofOecologiaen
dc.titleDemography in relation to population density in two herbivorous marsupials: Testing for source - Sink dynamics versus independent regulation of population sizeen
dc.typeJournal Articleen
dc.identifier.doi10.1007/s00442-004-1781-2en
dc.subject.keywordsTerrestrial Ecologyen
local.contributor.firstnameCNen
local.contributor.firstnameKAen
local.contributor.firstnameAen
local.subject.for2008060208 Terrestrial Ecologyen
local.subject.seo770703 Living resources (flora and fauna)en
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailkvernes@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:2306en
local.publisher.placeGermanyen
local.format.startpage70en
local.format.endpage76en
local.peerreviewedYesen
local.identifier.volume143en
local.identifier.issue1en
local.title.subtitleTesting for source - Sink dynamics versus independent regulation of population sizeen
local.contributor.lastnameJohnsonen
local.contributor.lastnameVernesen
local.contributor.lastnamePayneen
dc.identifier.staffune-id:kvernesen
local.profile.orcid0000-0003-1635-9950en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:692en
dc.identifier.academiclevelAcademicen
local.title.maintitleDemography in relation to population density in two herbivorous marsupialsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 102<br />Views: 107<br />Downloads: 0en
local.search.authorJohnson, CNen
local.search.authorVernes, KAen
local.search.authorPayne, Aen
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