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  • Collection Biodiversity Conservation
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  • Publication Year 2011
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GEF PAS Project Document - Prevention, Control and management of Invasive Alien Species in the Pacific Islands.
Biodiversity Conservation, BRB
Available Online
2011
Invasive Alien Species (IAS) are a major threat to marine, freshwater and terrestrial biodiversity of the Pacific islands and to the people there that depend on biodiversity for their livelihoods. Invasive species are implicated in the decline of hundreds of species in the region. Participating Pacific states and the executing agency SPREP (Secretariat of the Pacific Regional Environment Programme) recognised the need to implement the regional IAS strategy, “Guidelines for Invasive Species Management in the Pacific. A Pacific strategy for managing pests, weeds and other invasive species” (hereafter, the Guidelines) and develop and implement national IAS plans and strategies. The Guidelines were originally identified as a product under this project, but were completed in 2009 prior to writing this proposal. As envisaged during the PIF process the proposed project contributes to the implementation of the Guidelines, each country’s National Biodiversity Strategy and Action Plan and helps each to meet its responsibilities under Article 8 (h) of the CBD and several other international agreements addressing IAS. The three main components (not including components related to project management) of the proposed project are designed to capture outcomes and outputs described in the Project Identification Form but they have been reorganized to follow the structure of the Guidelines.
Hurricane disturbance accelerates invasion by alien tree Pittosporum undulatum in Jamaican montane rain forests
Biodiversity Conservation, BRB
Available Online

Bellingham, Peter J.

,

Excurra, E.

,

Healey, John R.

,

Tanner, Edmund V. J.

2005
Questions: Do past disturbance, soil nutrients, or species diversity predict the invasion success of the alien tree Pittosporum undulatum in an island montane rain forest? What are the consequences of its invasion for forest composition and species diversity? Location: Blue Mountains, Jamaica. Methods: Censuses of trees ? 3 cm DBH in permanent plots in four sites within ca. 7 ha; 1974–2004 (intensive sites) and in 16 plots within 250 ha; 1990–2004 (extensive plots). Results: Pittosporum was unrecorded in the intensive sites before a severe hurricane in 1988: by 2004 all four sites were invaded. Pittosporum had invaded 25% of the extensive plots in 1990 and 69% in 2004, where its basal area increased from 0.5 ± 0.4 (SEM) m2.ha?1 in 1990 to 2.8 ± 1.3 m2.ha?1 in 2004. It had zero stem mortality and diameter growth rate exceeded that of native species fourfold. Pittosporum's basal area in the extensive plots in 2004 was positively related to the stand basal area damaged in the 1988 hurricane and negatively related to soil N concentrations. Pittosporum invasion was unrelated to stand-level tree species diversity in the extensive plots but as its basal area increased over time the basal area of native species and stand-level diversity declined. Conclusions: There are no obvious functional attributes of Pittosporum unrepresented in the native tree flora although it has high photosynthetic efficiency compared with native trees. More widespread invasion of these forests by Pittosporum seems inevitable since hurricanes, which accelerated the invasion, affect these forests frequently.