Priority Species Indicator Aichi Target 12: By 2020 the extinction of known threatened species has been prevented and their conservation status, particularly of those most in decline, has been improved and sustained. Fiona Burns, Mark Eaton, Richard Gregory

Earliest available assessment Most recent assessment Number of Species Unknown Decreasing Stable Increasing Current Priority Species Indicator – BIYP 2012 What have we used in the past? Species List – UK BAP Approach – Best available information or expert assessment Coverage – Most BAP species Frequency – Last updated in 2008

What do we know about the status of threatened species? ~2900 Priority Species (S41, S42, SBL, NIBL) ~2900 Priority Species (S41, S42, SBL, NIBL) Qualitative data (Tier 3) Quantitative Data Abundance data (Tier 1) Distribution data (Tier 2) Species Indicator?

Species Abundance Data – Tier 1 Data availability – around 5% of threatened data – Covering a large proportion of threatened birds, mammals, butterflies & moths Approach – Combine species indices using a geometric mean similar to current biodiversity indicators Technical issues to overcome – Variable time periods – How to estimate variance Number of species

Qualitative Assessments – Tier 3 Very important group of species, many of these species are those at greatest risk of extinction At present this group constitute a large proportion of threatened species Covers a wide range of species – Rare and range restricted – Challenging to survey – Lack of attention Number of species

Questions to think about We can produce composite indices charting changes in species abundance – How do we interpret this, does a straight line mean a smiley face? – Can we use this to make more general conclusions about the changing status of threatened species? How do we display and interpret the information generated from the three types of data? How will the data availability and analysis methods change in the coming years and how will this impact the indicator? ?

The Conchological Society of Great Britain and Ireland