Using five-minute bird counts to study magpie (Gyfnnorhina tibicen) impacts on other birds in New Zealand

摘要

We 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 remove from five c. 900-ha study blocks, one in each of Northland, Waikato, Bay of Plenty, Wellington and Sout an . 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 equa time m paired treatment and non-treatment blocks, and (3) counted all blocks at the same time of year and on y in goo 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 kerera and tul) 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 tor our objectives, but that more research to examine their relationship to absolute densities is needed.