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KNOWLEDGE FOR LIFE
Identification and management toolkit for
invasive plant species in Laikipia, Kenya
Frances Williams
What are invasive alien
species?
An alien species is a species that has been introduced, as
a result of human activities, to a location (ecosystem or
area) where it does not occur naturally.
An invasive alien species (IAS) is an alien species that
causes (or has the potential to cause) harm to the
environment, economy and/or human health.
• Interfere with crop and pasture production through
competition for light, water and nutrients
• Displace crops and pasture species through the
production of toxins that inhibit the growth of other
plants
• Reduce the quality of livestock through toxicity
leading to death or retarded development, lowered
quality of animal products such as meat, milk, fleece,
or hides, or reproductive failure
• Invade water bodies affecting water quality and
quantity.
Perrings, 2005
Some impacts of invasive
plants:
Pastoralism contributes 50% to agricultural
Gross Domestic Product (GDP) in Kenya
A recent study indicated that without any management
of invasive plants there would be a 71% reduction in
grazing capacity in South Africa (van Wilgen et al.,
2008). The situation will be no different in East Africa.
Parthenium hysterophorus: Impacts on crop and
pasture production, human and animal health
(toxic), and biodiversity
82 – 95% reduction in sorghum
yields in Ethiopia
90% reduction in pasture
carrying capacities
Dermatitis and respiratory
problems in people
Toxic to livestock
Lantana camara: Impacts on crop and pasture
production, animal health (toxic) and biodiversity
Damage in India – US$924 million p.a.
Toxic to livestock
Prosopis juliflora: Impacts on crop and
pasture production, water resources,
biodiversity, and human health
Reduces water runoff by 481
million m3 p.a. in South Africa “Prosopis is a colonization
without weapons”
“For me dry trees are better than
a green killer”
Forms impenetrable thicketsDisplaces valuable pasture
species
Opuntia stricta: Impacts on pasture production,
animal health, and biodiversity
To develop toolkits for the identification and
management of IAPs to improve the ability of
those involved in conservation in Laikipia to
identify and control invasive species
Project objective
• To identify and fill gaps in existing knowledge on Invasive
Alien Plants (IAPs) presence and threats to biodiversity in
Laikipia
• To make comprehensive data on identification and
management of IAPs in Laikipia freely and widely
available, including an Identification Guide
• To increase the use of information resources by
landowners, communities, conservation organisations,
and other biodiversity stakeholders
• To contribute to the global knowledge pool on the
presence and distribution of IAS
Specific objectives
Those responsible for conservation in Laikipia will have
the information they need to manage IAPs better. This
will help to preserve ecosystems and native plants as
well as the animals which depend on them.
Key conservation outcome
Thank You

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Discovery Day Williams

  • 1. www.cabi.org KNOWLEDGE FOR LIFE Identification and management toolkit for invasive plant species in Laikipia, Kenya Frances Williams
  • 2. What are invasive alien species? An alien species is a species that has been introduced, as a result of human activities, to a location (ecosystem or area) where it does not occur naturally. An invasive alien species (IAS) is an alien species that causes (or has the potential to cause) harm to the environment, economy and/or human health.
  • 3. • Interfere with crop and pasture production through competition for light, water and nutrients • Displace crops and pasture species through the production of toxins that inhibit the growth of other plants • Reduce the quality of livestock through toxicity leading to death or retarded development, lowered quality of animal products such as meat, milk, fleece, or hides, or reproductive failure • Invade water bodies affecting water quality and quantity. Perrings, 2005 Some impacts of invasive plants:
  • 4. Pastoralism contributes 50% to agricultural Gross Domestic Product (GDP) in Kenya A recent study indicated that without any management of invasive plants there would be a 71% reduction in grazing capacity in South Africa (van Wilgen et al., 2008). The situation will be no different in East Africa.
  • 5. Parthenium hysterophorus: Impacts on crop and pasture production, human and animal health (toxic), and biodiversity 82 – 95% reduction in sorghum yields in Ethiopia 90% reduction in pasture carrying capacities Dermatitis and respiratory problems in people Toxic to livestock
  • 6. Lantana camara: Impacts on crop and pasture production, animal health (toxic) and biodiversity Damage in India – US$924 million p.a. Toxic to livestock
  • 7. Prosopis juliflora: Impacts on crop and pasture production, water resources, biodiversity, and human health Reduces water runoff by 481 million m3 p.a. in South Africa “Prosopis is a colonization without weapons” “For me dry trees are better than a green killer” Forms impenetrable thicketsDisplaces valuable pasture species
  • 8. Opuntia stricta: Impacts on pasture production, animal health, and biodiversity
  • 9. To develop toolkits for the identification and management of IAPs to improve the ability of those involved in conservation in Laikipia to identify and control invasive species Project objective
  • 10. • To identify and fill gaps in existing knowledge on Invasive Alien Plants (IAPs) presence and threats to biodiversity in Laikipia • To make comprehensive data on identification and management of IAPs in Laikipia freely and widely available, including an Identification Guide • To increase the use of information resources by landowners, communities, conservation organisations, and other biodiversity stakeholders • To contribute to the global knowledge pool on the presence and distribution of IAS Specific objectives
  • 11. Those responsible for conservation in Laikipia will have the information they need to manage IAPs better. This will help to preserve ecosystems and native plants as well as the animals which depend on them. Key conservation outcome