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Most protected areas in the world are affected to some degree by invasive species. The spread of plants and animals across the world has been occurring since humans began travelling across the oceans and the continents bringing with them species they like and unknowingly transporting other species. Modern globalisation has made the spread of species easier. Controlling/eradicating invasive species is a continuous aspect of protected area management, a line item in the budget. Although the challenge of invasive species can be daunting, there are success stories on Pacific Islands. Recovery: The Miracle on Palmyra atoll tells the story of rodent eradication by the application of the rodenticide, brodifacoum, and the subsequent recovery of plants and animals.
What are invasive species?
Invasive species are introduced species that become destructive to the environment or human interests on Pacific Island terrestrial and marine protected areas. Invasive species can also include some native species that proliferate and become destructive following environmental changes caused by human activities. Native species are plants, animals and other organisms that occur naturally on an island or offshore in a marine environment, having either evolved there or arrived there without human intervention.
What's so harmful about invasive species?
Environmental harm by invasive species refers to a biologically substantial decrease in environmental quality as indicated by a variety of potential factors, including declines in native species populations or communities, degraded habitat quality or long-term habitat loss, and/or altered ecological processes. Environmental harm may be a result of direct effects of pests on native species, including preying and feeding on them; causing or vectoring diseases; preventing them from reproducing; outcompeting them for food, nutrients, light, nest sites, or other vital resources; or hybridizing with them so frequently that within a few generations, few if any truly native individuals remain. Environmental harm also can be the result of an indirect effect of pest species. For example, decreased water bird use of a wetland may result from pest plant infestations reducing the availability and/or abundance of native wetland plants that provide forage or nesting for water birds.
This document lists the essential components of a comprehensive and effective invasive species management programme. It has been compiled in consultation with Pacific island countries and territories, to support them in developing their invasive species work, and to guide regional and international agencies in providing assistance to them.
In general, invasive species control involves using methods based upon effectiveness, cost, and minimal ecological disruption, which considers minimum potential effects to non-target species and the protected area environment. Pesticides may be used where physical, cultural, and biological methods or combinations thereof are impractical or incapable of providing adequate control, eradication, or containment. If a pesticide will be needed, the most specific (selective) chemical available for the target species should be used unless considerations of persistence or other environmental and/or biotic hazards will preclude it. Pesticide usage may be further restricted in order to comply with any nation’s or territory’s environmental laws.
Throughout the life of a protected area’s management plan, most proposed pesticide uses should be evaluated for potential effects to biological resources and environmental quality. Pesticide uses with appropriate and practical best management practices for habitat management as well as facilities maintenance should be approved for use where there likely will be only minor, temporary, and localized effects to species and environmental quality based upon non- exceedance of threshold values in chemical profiles. However, pesticides may be used in a protected area where substantial effects to species and the environment are possible (exceed threshold values) in order to protect human health and safety (e.g., mosquito-borne disease).
Major invasive species initiatives are underway in the Pacific. Pay attention to information in the following networks and projects. These web sites will be greatly expanded in the near future.
Pacific Invasives Battler Resource Base - This resource is to assist Pacific island invasive species practitioners in their battle against invasive species. t includes the “Guidelines for Invasive Species Management in the Pacific” which outlines a set of themes and objectives to assist in forming a comprehensive invasive species programme. It includes the Pacific Invasive Species Battler Series on common Pacific topical issues and an option to see what new resources have been added lately. You can also search for documents, case-studies, reports and other media by selecting the appropriate “Guidelines” theme or objective, or use the general search function by selecting tags related to the resources.
Pacific Invasives Learning Network (for invasive species teams, information and much more)
The largest cause of extinction of single country endemic species in the Pacific is the impact of invasive species. Invasives also severely impact our economies, ability to trade, sustainable development, health, ecosystem services, and the resilience of our ecosystems to respond to natural disasters.
Crown of Thorns: Lime Juice and Vinegar Injections as a Cheap and Natural Alternative to Control COTS Outbreaks
A project designed to reduce the environmental, economic, and human health impacts of invasive alien species in both terrestrial and marine habitats in the Pacific region.
Global Biodiversity Outlook 4: A mid-term assessment of progress towards the implementation of the Strategic Plan for Biodiversity 2011-2020
Global threats from invasive alien species in the twenty-first century and national response capacities
Tye, A. (compiler). 2009. Guidelines for invasive species management in the Pacific: a Pacific strategy for managing pests, weeds and other invasive species. SPREP, Apia, Samoa.
This document lists the essential components of a comprehensive and effective invasive species manage- ment programme. It has been compiled in consultation with Pacific island countries and territories, to support them in developing their invasive species work, and to guide regional and international agencies in providing assistance to them.
Invasive species’ (often called pests, weeds and diseases) are plants, animals, disease agents and other organisms taken beyond their natural range by people, deliberately or unintentionally, and which become destructive to the environment or human livelihoods. Islands are particularly vulnerable to invasive species, owing to the evolution of their native animals and plants in isolation from predators and diseases, and the dependence of island peoples on imports, travel and tourism, which lead to high rates of arrival of new pests. These Guidelines are designed to assist anyone planning and programming the management of invasive species on islands, with the aim of reducing the negative impacts of invasives on islands’ rich and fragile natural heritage, communities and livelihoods.
A new 2015 publication “ Invasive alien species in aquatic environments. Practical information and management insights” is now available in English. The first volume presents the current situation concerning IAS management in French freshwater (scientific knowledge, legislation, stakeholders, management).
The second volume is a collection of management experiments carried out in France and Europe. More than 60 managers have contributed and 26 species and 52 management experiments are described (objectives, protocols, results, costs, etc.).
Marine invasive species—including marine algae, fish, invertebrates, and pathogens—are widely recognised as a major cause of marine biodiversity loss worldwide (Molnar et al. 2008). Marine invasive species are spread throughout the Pacific along a number of pathways, including commercial cargo, fishing and cruise ships, recreational boats and gear, and marine debris.
The Battler Series includes many other titles related to invasive species
Pacific Invasives Learning Network empowers effective invasive species management through a participant-driven network that meets priority needs, rapidly shares skills and resources, provides links to technical expertise, increases information exchange, and accelerates on-the-ground action. PILN serves teams of Pacific Island agencies responsible for invasives management, including agencies responsible for agriculture and natural resource management, international trade and border control, as well as environment and conservation.
An invasive species is defined by the multi-agency National Invasive Species Council1 as one that is “1) non-native (or alien) to the ecosystem under consideration and 2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.” This position statement uses invasive species as an umbrella term referring to alien, exotic, nonindigenous, and non-native species.
On February 18, 2016, the U.S. Department of the Interior released an interdepartmental frameowrk for the early detection and rapid response (EDRR) of invasive species--a coordinated set of actions to find and eradicate potential invasive species before they spread and cause harm.. The bedrock of the report is that the earlier you see the invasive and the quicker you respond then better the chances of eliminating the invasive species.
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