South Africa’s first National Status Report on Biological...
Transcript of South Africa’s first National Status Report on Biological...
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South Africa’s first National Status Report on Biological Invasions
BIM & FBIP 15 August 2017
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This is a team effort…….
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Drafting team
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Bob Scholes WITS
David Richardson C I B
Christo Marais DEA
Mapula Tshangela DEA
Guy Preston DEA
Peter Lukey DEA
Wadzi Mandivenyi DEA
Bob Scholes WITS
David Richardson C I B
Christo Marais DEA
Mapula Tshangela DEA
Guy Preston DEA
Peter Lukey DEA
Wadzi Mandivenyi DEA
Reference and Advisory committee
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Why a status report?
Information from research
and monitoring
Assess the status
Inform policy and
management
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Legal requirement
The Institute [i.e. SANBI] …….. must ….. submit a report on the status of listed invasive species ……. within three years……………, and every three years thereafter
The report …. must contain a summary and assessment of:
• the status of listed invasive species; and
• the effectiveness of these regulations and control measures
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Our report goes beyond the legal requirement to consider:
The status of pathways of introduction and spread
The status of alien species
The status of invaded areas
The effectiveness of control measures
The effectiveness of regulations
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Appointment of SANBI/ C•I•B team
Review and collate available information
Arrange scientific symposium
Develop suite of indicators
Assign values to indicators
First full draft status report
First draft chapters
Review by stakeholders and contributing authors
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Review by experts and reference committee
Final status report
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34 papers presented at the symposium 23 papers submitted for publication 19 papers published 76 co-authors
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Developing indicators for the status report
• Based on emerging international schemes
• 21 indicators for:
– Pathways
– Species
– Areas
– Control effectiveness
• 4 high-level indicators
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Blackburn et al. 2011 TREE; Wilson et al. 2014 Biological Invasions
Species Alien Status—A Unified Framework
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Blackburn et al. 2014 PloS Biology; Hawkins et al. 2015 DDI
Alien Species Impact—the Environmental Impact Classification of Alien Taxa (EICAT) Scheme
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Wilson et al. in prep. 13
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Indicators for pathways
Indicator Description
Number of pathways
The number of discrete pathways along which species can be introduced and dispersed
Prominence of pathways
The relative size of each pathways – minimal, moderate, major or massive
Introduction rates Number of species introduced per pathway per decade
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Pathway of introduction
Pathways and their relative importance
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Scorecard: Pathway indicators
Indicator Value Level of confidence
Introduction pathway prominence
Minimal: 6 pathways Moderate: 10 pathways Major: 2 pathways Massive: 8 pathways Uncertain: 3 pathways
Moderate
Rate of introduction per pathway
0 species: 10 pathways < 50 species: 27 pathways > 50 species: 7 pathways
Low
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Indicators for alien species
Indicator Categories
Number and status of alien species
-Present but not naturalised -Naturalised but not invasive -Invasive
Extent of alien species Species range
Abundance of alien species Rare, occasional, frequent, common, abundant
Impact of alien species -Species with minimal, minor, moderate, major and massive impacts
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2102 alien species regulated (559), or recorded in the wild, in South Africa
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Best available data from SAPIA
• Increase between 2000 and 2016 by 172, from 601 to 773 species
• Marked increases in distribution of nine species
• Spread of species under biological control has slowed down or stopped
• No detectable impact of control on other species
Source: Henderson & Wilson 2017. Changes in the composition and distribution of alien plants in South Africa: An update from the Southern African Plant Invaders Atlas Bothalia
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Mapped extent of occurrence (but not abundance)
Common myna
Smallmouth bass
Mesquite
Black wattle
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Number of species that currently have major impacts in South Africa
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Alien species with massive impacts
Pines in fynbos
Prosopis in arid areas
Smallmouth bass in freshwater ecosystems
Wattles In mesic areas
Mediterranean mussel on rocky shores
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Scorecard: Alien species indicators Indicator Value Level of confidence
Number and status of alien species
• 119 present but not naturalised • 307 naturalised but not invasive • 720 invasive
High for plants, birds Low for the rest
Extent of alien species
Plants: • 600 species in < 10 QDS • 100 species in > 100 QDS
High for plants, birds Low for the rest
Abundance of alien species
• Not estimated yet Low?
Impact of alien species
• 107 species with major or massive impact
Low
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Indicators for invaded areas
Indicator Description
Alien species richness Number of invasive alien species in a particular area
Relative alien species richness
Number of invasive alien species in a particular area as a proportion of all species (native + alien)
Relative alien species abundance
Abundance (cover, biomass or population size) of alien species as a proportion of total abundance (native + alien)
Combined impact of alien species
Impacts on key ecosystem services
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Alien plant species richness at a national scale
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Alien species richness in invaded areas
Median richness for provinces (based on quarter degree grid cells)
Total richness for biomes
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Alien plant species abundance in invaded areas
Versfeld et al. (1998) confirmed what is generally accepted: • Western Cape is the most invaded province (28% of area
invaded to some degree) • Mpumalanga (16%) • Northern Cape (14%) • KwaZulu-Natal (9%) These estimates, besides being crude, are more than 20 years out of date, and both the extent of invasions, and the relative dominance of species, have changed considerably since then, but there is no effective monitoring of this.
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Example of area impact – reduction in mean annual runoff
Source: Le Maitre et al. 2016. Water SA
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Scorecard: Invaded areas indicators
Indicator Value Level of confidence
Alien species richness South Africa: 2102 species Breakdowns per biome
High for vertebrates and plants Low elsewhere
Relative alien species richness
Example 300/7000 for fynbos biome Moderate
Relative alien species abundance
No data n/a
Combined impact of alien species
Surface water runoff: 1500 – 2500 million m3/yr Livestock carrying capacity: 117 000 large livestock units Biodiversity intactness: 3%
Low
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Indicators for effectiveness of control measures
Type of indicator
Description
Inputs Money spent Planning coverage
Outputs Number of pathways, species or areas that are actively managed, as a proportion of all pathways, species or areas requiring management
Outcomes Estimated effectiveness (for each pathway, species or area) in categories (effective, partially effective, ineffective)
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Pathway management Only one entry point monitored by DEA at present
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Indicators of effectiveness of control measures: Pathways
• Separate measures by DAFF for agricultural pests could also reduce the rate of arrival of new environmental problems.
• Insufficient data to link the impact of these measures to the outcomes.
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How many species do we manage? (number listed, number managed)
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What proportion of the population of managed species do we get to?
34 Data supplied by Andrew Wannenburgh: DEA
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Indicators of effectiveness of control measures: Species
• 9 historical eradication programs – three succeeded (cats on Marion Island, two terrestrial
invertebrates) – six failed – More eradications expected over the coming decade.
• Biological control a major success - 15 species under
complete control, 19 species under substantial control.
• Management programmes have been developed for a small number of established invasive alien species, but none have been implemented. Their effectiveness therefore cannot be assessed.
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• Inputs – ~ R1.5 billion/yr
• Outputs – 2.8 million ha cleared, 8 million
ha followed up (over 20 years)
• Outcomes – Localised successes
– But continued growth in populations of most species at a national scale
Area control measures
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Contributing factors to success
• Ongoing direction from a diverse project steering committee
• Rapid response team
• Focus on areas of low infestation
• Very flexible management approach
• Regular monitoring
In addition “the team was only paid following completion of a contract and after a thorough inspection of the quality of the work by the Project Manager”.
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Effectiveness of regulations
• 100s of permits issued, risk assessments completed, notices served • Low levels of compliance with requirements to submit
notifications, control plans, research information • Huge capacity constraints • Too early to gauge effectiveness
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Scorecard: Intervention effectiveness indicators
Indicator Value Level of confidence
Input: Money spent Input: Planning coverage
~ R2 billion/yr 4%
Moderate (underestimate) Low
Output: Proportion managed 77% of pathways 24% of species 0.36% of land
Moderate Moderate Moderate
Outcome: Management effectiveness
8% effective 58% partially effective 34% ineffective
Low Low Low
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Scorecard: High-level indicators
Indicator Value Trend Level of confidence
Rate of introduction of new species per decade
70 Low
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Scorecard: High-level indicators
Indicator Value Trend Level of confidence
Rate of introduction of new species per decade
70 Low
Number of species with major impacts
107 Low
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Scorecard: High-level indicators
Indicator Value Trend Level of confidence
Rate of introduction of new species per decade
70 Low
Number of species with major impacts
107 Low
Percent of area experiencing major impacts
5% Low
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Scorecard: High-level indicators
Indicator Value Trend Level of confidence
Rate of introduction of new species per decade
70 Low
Number of species with major impacts
107 Low
Percent of area experiencing major impacts
5% Low
Effectiveness of control measures (%)
5.56% Low
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Thank you
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https://abcjournal.org/index.php/ABC/issue/view/113
https://www.sanbi.org/news/sanbi-invites-comments-national-status-report-biological-invasions-sa