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Spatial Economic Analysis of Early Detection and Rapid Response Strategies for an Invasive Species
BRB
Available Online

Burnett, Kimberly

,

Kaiser, Brooks

2010
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. EDRR consists of search activities beyond the ports of entry, where search (and potentially removal) efforts are targeted toward areas where credible evidence suggests the presence of an invader. EDRR costs are a spatially dependent variable related to the ease or difficulty of searching an area, while damages are assumed to be a population dependent variable. A myopic strategy in which search only occurs when and where current expected net returns are positive is attractive to managers, and, we find, significantly lowers present value losses (by $270m over 30 years). We find further that in the tradeoff between search costs and damages avoided, early and aggressive measures that search some high priority areas beyond points of entry even when current costs of search exceed current damages can save the island more ($295m over 30 years). Extensive or non-targeted search is not advised however.
The state of marine resources of Helen reef in the year 2000: results of scientific and community monitoring surveys, April 24 to May 3, 2000 : final report
Biodiversity Conservation
Available Online

Birkeland Charles

2000
Helen Reef in the Southwest Islands of Palau is the one of the greatest marine assets of the Hatohobei (Tobi) People and of the Republic of Palau. Helen Reef is known as one of the most biologically diverse coral reef atolls in the Pacific and historically one of the most biologically abundant reefs in Palau,including acclaimed populations of plentiful marine resources including, trochus, turtles, sea cucumbers, seabirds, and many large reef fish. Reflected in its traditional Hatohobeian name Hotsarihie, which signifies “Reef of the Giant Clam”, Helen Reef is perhaps most famous in the region for its once ubiquitous giant clams, and unfortunately the unchecked foreign poaching that has occurred there over the past decades. The richness and abundance of the atoll’s resources are factors of its location, being remote from human populations and bordering the biodiverse marine eco-regions of Melanesia and SE Asia. The cumulative characteristics of the atoll have attracted many users over time including subsistence fishers from Hatohobei and neighboring islands, sea-faring traders, local businesses interests, and foreign commercial resource operations. The remoteness of Helen Reef which contributes to its historical levels of resource abundance is also a underlying cause for recent resource declines, as the atoll is usually uninhabited and has been notably vulnerable to poaching for the last half century by foreign fishermen from Asian countries