A Threatened Bird Index for Queensland
Date: 27, Nov, 2018
Publisher: TSR Hub
Here, the national Threatened Bird Index (TBX) is drilled down to display information relating to trends for threatened birds in Queensland (Figure 1A). In its first iteration, this index incorporates data on 14 threatened bird species, subspecies or distinct populations (Vulnerable, Endangered or Critically Endangered under the EPBC Act and/or as assessed by BirdLife Australia - see Table 1). More data will be added as they become available each year allowing the index to grow.
The index shows the estimated yearly change in relative abundance of threatened bird species in relation to a baseline year, for which 1985 was chosen, where the index is set to 1.0. However, later baseline years are also available to support the specific needs of conservation managers and can be selected via the web-app. Changes in the index are proportional—a value of 0.5 indicates the multi-species relative abundance is 50% below the baseline value; a value of 1.5 indicates 50% above the baseline.
In 2015, the Qld TBX value using data currently available is 0.26. This suggests that the relative abundance of threatened birds for which we have suitable data has decreased by 74% between 1985 and 2015. While the overall index value in 2015 is 0.26, individual species have TBX values between 0.10 (a 90% decrease) and 0.57 (a 43% decrease). In comparison, the national TBX shows a decrease of 52% in the data compiled about threatened birds Australia-wide.