University of Hawaii

This paper develops a model of invasive species control when the species’ population size is unknown. In the face of an uncertain

The botany of four small, relatively undisturbed tuff cone islands off the east coast of Upolu, Western Samoa, is examined. During a series of visits to the islands, the vegetation was studied in nine sample plots, and a checklist of the 260 species comprising the flora was compiled. Six types of native vegetation are recognized, one of which (Diospyros coastal forest) appears to be unique to tuff cone islands. Casual observations were made on the avifauna and turtle

The giant African snail, Achatina fulica Bowdich, one of the most destructive molluscan pests of many tropical areas of the world, became established in Hawaii November 30, 1936. To control this pest predaceous snails, Gonaxis quadrilateralis (Preston), G. kibweziensis (E. A. Smith), and Euglandina rosea (Ferussac) were introduced. According the Davis, the population of A. Fulica has declined markedly in recent years and numerous empty shells have been observed in many areas of Oahu.

Economic impacts from invasive species, conveyed as expected damages to assets from invasion and expected costs of successful prevention and/or removal, may vary significantly across spatially differentiated landscapes. We develop a spatial-dynamic model for optimal early detection and rapid-response (EDRR) policies, commonly exploited in the management of potential invaders around the world, and apply it to the case of the Brown treesnake in Oahu, Hawaii.