Engaging citizens to control the spread of invasive species
Invasive species in Amboseli, Tsavo and Nakuru NPs had covered large areas of wildlife habitat, displaced native biodiversity, reduced favorable forage, affected wildlife distribution and lessened visitor enjoyment. In each park, KWS staff worked with local people and other scientists to identify invasive species, their impact on wildlife, strategies for early detection, and mechanisms for control and eradication. Special focus was given to species that were growing fast, breeding profusely, dispersing widely and outgrowing native species. Areas of heavy infestation were mapped and divided into blocks to enable systematic control. Mechanical removal was preferred over chemical-based eradication to minimize risks to non-target species. KWS organized volunteer groups from local institutions and communities to mechanically uproot invasive plants from designated areas. In some cases local people were hired to work in difficult areas. The uprooted trash was either burnt in abandoned quarries or buried to prevent re-invasion. Plots were revisited for three growing seasons and regrowth removed.
• Many citizen groups showed willingness to participate in the eradication of invasive species
• There was plenty of local labor for mechanical control, a labor intensive method.
• A good understanding of the impact of invasive species existed at individual and community levels
• Traditional and expert knowledge was available for identifying invasive species and their impacts
• Sufficient funding was available to purchase the required implements, pay casual workers when necessary and to support logistics
• Re-invasion was observed and complete eradication was only possible after three consecutive mechanical removal sessions spanning several growing seasons.
• Herbivores were immediately able to utilize cleared areas, but large predators were disadvantaged as stalking prey was more difficult in more open areas.
• Disposal of uprooted biomass can pose a significant challenge and should be planned for in advance
• Understanding the cause and mechanism of invasion can help in the eradication or containment of invasive species
• Providing free park entry to volunteers can be an initial incentive for volunteers to participate in invasive species control
• Communicating the success and challenges of invasive species control can attract additional support from stakeholders and donors.