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Science for Saving Species Research Findings Factsheet Project 3.1

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Science for Saving Species Research Findings Factsheet Project 3.1 Science for Saving Species Research findings factsheet Project 3.1 Factsheet: A Threatened Mammal Index for South Australia Research in brief How can the index be used? This project is developing a For the first time in Australia, an for threatened plants are currently Threatened Species Index (TSX) for index has been developed that being assembled. Australia which can assist policy- can provide reliable and rigorous These indices will allow Australian makers, conservation managers measures of trends across Australia’s governments, non-government and the public to understand how threatened species, or at least organisations, stakeholders and the some of the population trends a subset of them. In addition to community to better understand across Australia’s threatened communicating overall trends, the and report on which groups of species are changing over time. It indices can be interrogated and the threatened species are in decline will inform policy and investment data downloaded via a web-app to by bringing together monitoring data. decisions, and enable coherent allow trends for different taxonomic It will potentially enable us to better and transparent reporting on groups or regions to be explored understand the performance of relative changes in threatened and compared. So far, the index has high-level strategies and the return species numbers at national, state been populated with data for some on investment in threatened species and regional levels. Australia’s threatened and near-threatened birds recovery, and inform our priorities TSX is based on the Living Planet and mammals, and monitoring data for investment. Index (www.livingplanetindex.org), a method developed by World Wildlife Fund and the Zoological A Threatened Species Index for mammals in South Australia Society of London. The TSX has been designed to be a dynamic Different taxonomic groups can decision about the currently tool to which new monitoring data be explored individually in the listed taxa. are added and examined annually. Threatened Species Index. And we Data on these mammal taxa come can also look at trends produced from fixed sites where they have been for Australian states and territories. repeatedly monitored in a systematic Here, we present a report from the and standardised way. For some of national Threatened Mammal Index the terrestrial sites, the data custodians (TMX) on trends for threatened provided information on whether they and near-threatened mammals for have been intensively managed and South Australia (Figure 1A). In its first how. This information allowed us to iteration, this index incorporates look at the trend across all monitored data from 12 threatened and near- sites which is the overall Threatened threatened mammal taxa (Near Mammal Index (Figure 1) but also to Threatened, Vulnerable, Endangered drill down to look at the trends for: or Critically Endangered under the EPBC Act and/or IUCN – see Table 1). 1. Sites subject to any management We used information from the (e.g., introduced predator- Australian Species Profile and Threats free havens/islands and other Database and the international IUCN dedicated conservation Red List as of July 2019 to make a management) (Figure 2), A Threatened Species Index for mammals in South Australia (continued) 2. Sites without introduced predators as stable or increasing while in fact value; a value of 1.5 indicates 50% (islands and fenced exclosures) the extant population outside of the above baseline. (Figure 3), and predator-free safe havens continues For the index on all sites in South to decline, and thus needs to be 3. Sites with no (known) targeted Australia where threatened and examined carefully. management (Figure 4). near-threatened mammals were The index shows the estimated monitored, the TMX value in 2016 The division of sites/populations has yearly change in relative abundance based on the current data is 2.12. been made solely on information of threatened and near-threatened This suggests that the relative provided by the custodians. This mammal taxa in relation to a baseline abundance of threatened and near- separation into subindices based on year, for which 1995 was chosen, threatened mammals for which we the type of intensive management where the index is set to 1.0. This have information has increased by is important especially for mammals baseline year was chosen because 112% between 2000 and 2016. While monitored after being reintroduced very few of the ongoing monitoring the overall index value in 2016 is into fenced or predator-free island programs originated before 1995. 2.12, individual taxa have TMX values areas. These areas are often more However, later baseline years are also between 0.47 (a 53% decrease) and intensively monitored than extant available to support the specific needs 7.01 (a 601% increase) (Figure 1A). populations, have fewer threats, and of conservation managers and can be It is expected that more data (and have the potential to significantly bias selected via the web-app. Changes in taxa) will be added as they become the population trends in the overall the index are proportional – a value of available each year, allowing the index. The reintroduced population 0.5 indicates the multi-taxon relative index to grow. trends may skew the overall result abundance is 50% below the baseline for a taxon and show the population What should we know about the South Australian data? This overall index on all monitored sites The number of sites monitored that predator-free, fenced wildlife reserve is based on 108 time series (defined met the TMX criteria (Figure 1C) has managed by the independent not-for- as sites where data on a taxon are substantially increased since around profit Arid Recovery. With a TMX value recorded using the same methodology 2000, while the number of taxa of 6.96, it shows an average increase and a consistent monitoring effort monitored increased from seven in of 596% between 2000 and 2016 though time) across these 12 taxa. 2000 to 11 in 2013 (Figure 1D). In (Figure 3). combination, this has resulted in a large Data quality was maximised by: The index corresponding to sites with increase in the time series available: 1) checking whether each dataset no (known) targeted management from 12 in 2000 to 100 in 2013. had been produced by standardised is based on 95 time series and three monitoring; and 2) by sending surveys The index containing data on sites mammal taxa. The TMX value in 2016 on 127 eligible datasets to custodians that were subject to any management is 0.49, which indicates a 51% decrease and requesting them to assess the such as introduced predator-free on average in relative mammal trends produced for their datasets. havens/islands and other dedicated abundance between 2000 and Feedback was received for 74% of conservation management (i.e., 2016 (Figure 4). the datasets. Only time series that sustained predator baiting and As more high-quality data become had been produced by standardised ecological fire management) has 13 available they can be added, making monitoring and with a minimum length time series with data on 10 mammal the index more powerful, meaningful of two years, collected between 1995 taxa. This index has a 2016 value and representative. Increasing and 2016 inclusive, were used for index of 3.65 which corresponds to an the number of taxa, regions and calculation. Sub-trends of the overall increase of 265% between 2000 functional groups monitored would trend can be calculated if data on and 2016 (Figure 2). strengthen the value of the index. at least three taxa are available. The index which includes only island Ongoing long-term monitoring The data underlying the index mostly and other predator-free sites is based programs allow for continuing derive from monitoring programs on nine time series and eight mammal capability to track changes in the in coastal South Australia and from taxa. Most of the sites included in relative abundance of threatened the arid zone (Figure 1B). this sub-trend are from the 123 km2 and near-threatened mammal taxa. Interpretational issues and constraints • This composite index only includes of representation of threatened • The proportional representation of data for threatened and near- and near-threatened mammal threatened and near-threatened threatened mammal taxa provided taxa (see Table 1). mammal taxa, and spatial coverage, by the custodians endeavouring is low in comparison to data on • There were limited appropriate to meet the TMX criteria supplied. threatened and near-threatened monitoring data for remote Inspection of these data indicate birds (Threatened Bird Index). areas available for inclusion they are biased to the coastal areas in the index to 2016. of most states and are sparse for the arid zone. The index can be • Some mammal subgroups, such useful for also identifying strategic as bats and rodents, are still monitoring opportunities to underrepresented. increase the comprehensiveness Fig 1: The Threatened A B Mammal Index (TMX) including data from all sites where threatened and near-threatened mammal taxa were monitored 12 taxa 108 time series C D Figure 1: A) The Threatened Mammal Index (TMX) for South Australia, including data from all sites where threatened and near-threatened mammal taxa were provided. The blue line shows the change in mammal abundance relative to the baseline year of 2000, where the index is set to 1.0. The grey cloud shows the range of trends for the individual taxa that make up the overall multi-taxon index. It can be seen as the variability between single-taxon trends that contribute to the composite (i.e., it is not statistical confidence). B) A map showing where threatened and near-threatened mammal data were recorded in South Australia. The red dots indicate repeatedly monitored fixed sites. C) This dot plot shows the particular years for which monitoring data were available to compile the index.
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