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dc.contributor.authorInnes, John G.
dc.contributor.authorSpurr, Eric B.
dc.contributor.authorArnold, Greg
dc.contributor.authorMorgan, Dai K.J.
dc.contributor.authorWaas, Joseph R.
dc.contributor.authorWatts, Corinne
dc.date.accessioned2013-04-04T03:07:51Z
dc.date.available2013-04-04T03:07:51Z
dc.date.issued2012
dc.identifier.citationInnes, J.G., Spurr, E.B., Arnold, G., Morgan, D.K.J., Waas, J.R. & Watts, C. (2012). Using five-minute bird counts to study magpie (Gymnorhina tibicen) impacts on other birds in New Zealand. New Zealand Journal of Ecology, 36(3), 1-9.en_NZ
dc.identifier.issn0110-6465
dc.identifier.urihttps://hdl.handle.net/10289/7416
dc.description.abstractWe used five-minute bird counts to investigate whether introduced Australian magpies (Gymnorhina tibicen) influence the abundance of other birds in rural New Zealand. Over 3 years, magpies were removed from five c. 900-ha study blocks, one in each of Northland, Waikato, Bay of Plenty, Wellington and Southland. Birds were counted in both the treatment blocks and paired non-treatment blocks for the 3 years of removal and also 1 year before. To minimise problems raised elsewhere with index counts we (1) selected treatment blocks and count stations using randomisation procedures, (2) used trained observers who spent equal time in paired treatment and non-treatment blocks, and (3) counted all blocks at the same time of year and only in good weather. On average, 548 magpies were removed from each treatment block each year, with magpie counts reduced by 76% relative to non-treatment blocks. Our results suggest magpies may restrict the movements of some birds (including kererū and tūī) in rural areas, but are less important than pest mammals at limiting population abundance at a landscape scale. We submit that five-minute bird counts were appropriate for our objectives, but that more research to examine their relationship to absolute densities is needed.en_NZ
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherNew Zealand Ecological Societyen_NZ
dc.relation.urihttp://www.newzealandecology.org/nzje/contents.php?volume_issue=j36_3en_NZ
dc.rightsThis article is published in the journal: New Zealand Journal of Ecology. © 2012, New Zealand Ecological Society.en_NZ
dc.subjectabundance indicesen_NZ
dc.subjectAustralian magpieen_NZ
dc.subjectimpactsen_NZ
dc.titleUsing five-minute bird counts to study magpie (Gymnorhina tibicen) impacts on other birds in New Zealanden_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfNew Zealand Journal of Ecologyen_NZ
pubs.begin-page1en_NZ
pubs.elements-id37881
pubs.end-page9en_NZ
pubs.issue3en_NZ
pubs.volume36en_NZ


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