Home About National indicators Partners Resources

Trends in the numbers of invasive alien species introduction events

Key indicator facts

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2014

Coverage

Global

Availability

Not freely available

Partners

Issg logo

IUCN Invasive Species Specalist Group

Contact point

Indicator description

This indicator measures the trends of invasive alien species introduction events (IAS) of 21 countries, which were selected for having at least 30 records of species with known invasion date. Species were designated as invasive according to standard evidence-based criteria. The indicator was based on 3914 IAS and 4903 species-country records. While all taxonomic groups were considered, the majority of the records are plants, invertebrates, fish, mammals and birds.

Related Aichi Targets

Primary target

9

Target 9:

By 2020, invasive alien species and pathways are identified and prioritized, priority species are controlled or eradicated, and measures are in place to manage pathways to prevent their introduction and establishment.

Primary target

9

Target 9:

By 2020, invasive alien species and pathways are identified and prioritized, priority species are controlled or eradicated, and measures are in place to manage pathways to prevent their introduction and establishment.

9

Related SDGs

E sdg goals icons individual rgb 15

GOAL 15 - Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss.

Target 15.8| Relevant indicator

By 2020, introduce measures to prevent the introduction and significantly reduce the impact of invasive alien species on land and water ecosystems and control or eradicate the priority species.

E sdg goals icons individual rgb 15

GOAL 15 - Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss.

E sdg goals icons individual rgb 15

Other related MEAs and processes

Cms logo blue4c

CMS

Target 7| Relevant indicator

Multiple anthropogenic pressures have been brought to levels that are not detrimental to the conservation of migratory species or to the functioning, integrity, ecological connectivity and resilience of their habitats.

Indicator icon

IPBES Global Assessment Chapters

Chapter 2| Official indicator

Status and trends; indirect and direct drivers of change

Chapter 3| Official indicator

Progress towards meeting major international objectives related to biodiversity and ecosystem services

Indicator icon

IPBES Regional Assessment Chapters

Chapter 4| Official indicator

Direct and indirect drivers of change in the context of different perspectives of quality of life

Ramsar.logo

Ramsar

Target 4| Relevant indicator

Invasive alien species and pathways of introduction and expansion are identified and prioritized, priority invasive alien species are controlled or eradicated, and management responses are prepared and implemented to prevent their introduction and establishment.

Cms logo blue4c

CMS

Indicator icon

IPBES Global Assessment Chapters

Indicator icon

IPBES Regional Assessment Chapters

Ramsar.logo

Ramsar

Cms logo blue4c
Indicator icon
Indicator icon
Ramsar.logo

Themes

Bip species

Partners

Issg logo

Key indicator facts

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2014

Coverage

Global

Availability

Not freely available

Indicator description

This indicator measures the trends of invasive alien species introduction events (IAS) of 21 countries, which were selected for having at least 30 records of species with known invasion date. Species were designated as invasive according to standard evidence-based criteria. The indicator was based on 3914 IAS and 4903 species-country records. While all taxonomic groups were considered, the majority of the records are plants, invertebrates, fish, mammals and birds.

Contact point

Graphs / Diagrams

Aliens2

Figure 1. Number of invasive alien species with known invasion date in 21 selected countries.

Pic2

Figure 2. Trend indicator showing the mean index of the cumulative number of invasive alien species across 21 countries.

Current storyline

Invasive alien species (IAS) are plants, animals or micro-organisms outside of their natural geographic range whose introduction and or spread threatens biodiversity, food security, human health, trade, transport and or economic development. They pose the second biggest threat to biodiversity globally, and in certain ecosystems notably islands, the greatest threat to biodiversity. IAS have reached all corners of the globe and impact biodiversity in many ways. The cost of damage caused by invasive species is estimated as US$ 1.4 trillion per annum – close to 5% of global GDP.

Invasive species indicators and alien species trends allow assessment of the efficacy of biosecurity policies. Trends in policy responses, legislation and management plans to control and prevent spread of invasive alien species demonstrates the commitment of nations and institutions to addressing this threat.

Results show that countries hosted in 2012 on average 1.7 times more invasive alien species (IAS) than they did in 1970. The included islands showed a threefold increase of introduced species since 1900, while the countries at continents showed a sevenfold increase. This pattern might be explained by the fact that islands have been exposed to large numbers of alien species introductions already before 1900, and thus increases in alien species accumulation have more recently been less pronounced than in continental countries.

Data and methodology

Possible disaggregations: Regional level, National level.

Metadata used: This indicator measures the trends of invasive alien species (IAS) of 21 countries, which were selected for having at least 30 records of species with known invasion date. Species were designated as invasive according to standard evidence-based criteria. The indicator was based on 3914 IAS and 4903 species-country records. While all taxonomic groups were considered, the majority of the records are plants, invertebrates, fish, mammals and birds. The trends were calculated as the geometric mean of the cumulative number of IAS across all 21 countries, the year 1970 was set as index value 1.

National use of indicator

At a regional scale indicators have been produced for Europe through the Streamlining European 2010 Biodiversity Indicators project (http://www.eea.europa.eu/highlights/publications/progress-towards-the-european-2010-biodiversity-target/).

At the national level this indicator is useful to measure the trends in the presence/occurrence of alien and potentially invasive species and inform decisions to do with prevention of alien species introduction and the management and control of invasive species causing impacts on biodiversity and ecosystems.

The greater the number of documented Invasive Alien Species (IAS) the greater the threat to biodiversity from IAS. The number of Alien Species (AS) is the best proxy of number of IAS, and can be used to assess trends of invasions (See Genovesi et al 2013 for an explanation).

Dis-aggregated national datasets were used in the assessment of the State of Conservation in Oceania in 2014 (22 Pacific Island Countries and Territories). This is as yet, in draft form.

Further resources

Key indicator facts

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

Pressure

Applicable for national use

Yes

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2014

Coverage

Global

Availability

Not freely available

Partners

Issg logo

IUCN Invasive Species Specalist Group

Contact point