Transcript Priority Species Indicator

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
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
Number of Species
Current Priority Species Indicator – BIYP 2012
Unknown
Decreasing
Stable
Increasing
Earliest available
assessment
Most recent
assessment
What do we know about the status of threatened species?
~2900 Priority Species
(S41, S42, SBL, NIBL)
Quantitative
Data
Abundance data
(Tier 1)
Distribution data
(Tier 2)
Species Indicator?
Qualitative data
(Tier 3)
Species Abundance Data – Tier 1
• Data availability
• Approach
– Combine species indices
using a geometric mean
similar to current biodiversity
indicators
• Technical issues to overcome
– Variable time periods
– How to estimate variance
3500
Number of species
– around 5% of threatened
data
– Covering a large proportion
of threatened birds,
mammals, butterflies &
moths
Plants & Fungi
Invertebrates
Vertebrates
3000
2500
2000
1500
1000
500
0
Priority List
Abundance
Data
Qualitative Assessments – Tier 3
– Rare and range restricted
– Challenging to survey
– Lack of attention
Plants & Fungi
Invertebrates
Vertebrates
3500
Number of species
• 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
3000
2500
2000
1500
1000
500
0
Priority List
Red List
Assessments
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?
Distribution
Abundance
Qualitative Assessment
1.6
1.4
1.2
?
1
0.8
0.6
0.4
0.2
0
1
2
3
4
The Conchological Society
of Great Britain and
Ireland