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ESTIMATING AND APPLYING BIOLOGICAL PARAMETERS TO ENHANCE MANAGEMENT OF RAUVOLFIA VOMITORIA AN INVASIVE TREE IN NORTH KOHALA, HAWAIʻI

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Title: ESTIMATING AND APPLYING BIOLOGICAL PARAMETERS TO ENHANCE MANAGEMENT OF RAUVOLFIA VOMITORIA AN INVASIVE TREE IN NORTH KOHALA, HAWAIʻI
Authors: Sullivan, Timothy Olson
Advisor: Price, Jonathan
Keywords: Conservation biology
Ecology
Hawaii
Invasive containment
Invasive management
show 3 moreInvasive species
Invasive trees
Rauvolfia vomitoria

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Issue Date: Jun 2017
Abstract: Introduced tree species can cause environmental harm through invasive traits like fast growth rates, long-term seed longevity, and long-distance seed dispersal. I estimated these rates for Rauvolfia vomitoria, a tree native to tropical Africa, which was introduced to Hawaii Island in the 1950’s. I then compared these rates to other local trees species, both native and invasive, in order to understand R. vomitoria’s relative invasive risk. It appears to be slow growing at ~1.4mm DBH growth annually, but its seeds can survive over 3 years and can be dispersed up to 1km. Managers have concluded R. vomitoria warrants control, and have decided to contain the invasion. Based on my estimates for growth and dispersal, I calculated the cost for a number of containment scenarios, which ranged from $36,000-$88,000 annually. Given that average annual funding for R. vomitoria control is ~$35,000, managers may need to request more funding or change management-tactics.
Pages/Duration: 73 pages
URI/DOI: http://hdl.handle.net/10790/3232
Appears in Collections:Tropical Conservation Biology and Environmental Science



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