National Park Service

Pacific Island Network (PACN)

Invasive Plant Species Monitoring

Invasive ginger at Hawaiʻi Volcanoes National Park
Invasive ginger at Hawaiʻi Volcanoes National Park

Features & Briefs

Monitoring Reports

Monitoring Protocol

For more information contact: Alison Ainsworth

Description & Rationale

Video: Alien Invasion - Invasive Plant Species

Nonnative plant species invasions present a serious threat to Pacific island ecosystems by reducing native plant diversity and abundance, and by altering vegetation structure important for habitat. Ecologically disruptive species (e.g., nonnative grasses, faya trees, miconia, strawberry guava) can also lead to significant economic and cultural costs. For example, nonnative grasses fuel fires that threaten urban areas, agricultural lands, and culturally significant landscapes. Monitoring of the distribution and abundance of nonnative species is required to assess changing threats to native ecosystems, formulate appropriate control strategies (e.g., eradication, containment, exclusion, monitoring), and prioritize areas for management.

Monitoring Objectives

  1. Determine the changes in the distribution and abundance of disruptive nonnative plant species along belt transects spanning selected plant communities and natural areas of concern in PACN parks. Belt transects will consist of a mixture of legacy transects and newly generated random transects.
  2. Determine the changes in the distribution and abundance of disruptive nonnative plant species within and around major dispersal corridors in PACN parks. Major dispersal corridors consist of areas where humans (e.g., seeds on vehicles, boots, field equipment, etc.) are the primary vector for spreading invasive plant species. This objective aims to monitor established invasive plant species as well as incipient invaders.

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Last Updated: May 12, 2017 Contact Webmaster