report: state of new zealand garden birds 2017 - …...new zealand garden bird survey 2018 30 june...
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31,679gardensurveys
nationwide
THANK YOUto all our volunteerbird counters!
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
1387
1982
2737
1688
3998
2953
37913444
31473482
3088
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We have estimated how bird counts have changed since 2007 across New Zealand's regions
for 14 common garden visitors − five native and nine introduced birds.
Thanks to all our volunteer bird counters, 31,679 garden surveys have been completed nationwide
since 2007. We use specialised statistical tools to account for variation in sampling effort
between regions, towns and suburbs over time. We also account for variation in bird counts
depending on whether the surveyed gardens were in a rural or urban setting and if birds were
fed or not. We also correct for the actual number of gardens in each area.
We then classify these changes according to their direction and size (see diagram below) to
help us identify changes of potential concern or interest.
How have
bird countschanged? Drawing attention to
changes in counts thatmay be of concern or interest
RAPID MODERATE SHALLOW NO OR LITTLE SHALLOW MODERATE RAPIDDECLINE DECLINE DECLINE CHANGE INCREASE INCREASE INCREASE
50% or 25% or 10% or Over Over Overmore more more 10% 50% 100%
Counts decline Counts increase
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