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dc.contributor.authorHui, C.
dc.contributor.authorBoonzaaier, C.
dc.contributor.authorBoyero, L.
dc.date.accessioned2013-01-28T09:55:21Z
dc.date.available2013-01-28T09:55:21Z
dc.date.issued2012
dc.identifier.citationHui, C., Boonzaaier, C. & Boyero, L. (2012) Estimating changes in species abundance from occupancy and aggregation. Basic and Applied Ecology, 13: 169-177.en
dc.identifier.issn1439-1791en
dc.identifier.urihttp://hdl.handle.net/123456789/1173
dc.description.abstractPredicting the change in abundance is pivotal for evaluating species’ current conservation status and population viability. Empirical works have suggested that species with an increasing abundance have a more aggregated distribution than those with a declining abundance (namely, the change-aggregation hypothesis, CAH). Here we introduced an improved negative binomial distribution model of the occupancy-abundance relationship (OAR) to estimate the change in abundance from changes in occupancy or aggregation. Analysis of the model suggests that (i) in general the change in abundance is synchronized with the change in occupancy when the level of environmental heterogeneity remains constant, and (ii) there could exist a threshold of the population density above which the CAH is no longer valid. Tests using data of epigaeic ants in Fynbos of South Africa collected from different seasons and macro-invertebrates from different localities in streams of central Spain verified these model propositions and thus support the use of this model as a monitoring method for assessing species persistence. Results suggest that the change in abundance can be estimated from the change in occupancy often obtained from cost-efficient presence-absence records, and a revision of the traditional CAH is necessary to capture the threshold phenomenon in the change-aggregation relationship. This work thus signifies the use of the three distinct but related concepts of population structure (i.e. occupancy, abundance and aggregation) in conservation biology.en
dc.description.sponsorshipWe are grateful to the comments and logistic help from M.A. McGeoch, S. Harrison, B. Laniewski, C.L. Parr, D.M. Mager, K. Gross and B. Beckage. This work was supported by the NRF Blue Sky Programme and the DST-NRF Centre of Excellence for Invasion Biology.en
dc.format.extent523372 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.subjectOccupancy-abundance relationshipen
dc.subjectChange-aggregation hypothesisen
dc.titleEstimating changes in species abundance from occupancy and aggregationen
dc.typeJournalArticlesen
dc.cibjournalBasic and Applied Ecologyen
dc.cibprojectSpatial concordance in diversity and its temporal changeen


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