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http://dx.doi.org/10.5657/kfas.2007.40.4.201

Abundance Estimation of the Finless Porpoise, Neophocaena phocaenoides, Using Models of the Detection Function in a Line Transect  

Park, Kyum-Joon (Cetacean Research Institute)
Kim, Zang-Geun (Cetacean Research Institute)
Zhang, Chang-Ik (Department of Marine Production Management, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.40, no.4, 2007 , pp. 201-209 More about this Journal
Abstract
Line transect sampling in a sighting survey is one of most widely used methods for assessing animal abundance. This study applied distance data, collected from three sighting surveys using line transects for finless porpoise that were conducted in 2004 and 2005 off the west coast of Korea, to four models (hazard-rate, uniform, half-normal and exponential) that can use a variety of detection functions, g (x). The hazard-rate model, a derived model for the detection function, should have a shoulder condition chosen using the AIC (Akaike Information Criterion), as the most suitable model. However, it did not describe a shoulder shape for the value of g(x) near the track tine and underestimated g (x), just as the exponential model did. The hazard-rate model showed a bias toward overestimating the densities of finless porpoises with a higher coefficient of variation (CV) than the other models did. The uniform model underestimated the densities of finless porpoise but had the lowest CV. The half-normal model described a detection function with a shape similar to that of the uniform model. The half-normal model was robust for finless porpoise data and should be able to avoid density underestimation. The estimated abundance of finless porpoise was 3,602 individuals (95% CI=1,251-10,371) inshore in 2005 and 33,045 individuals (95% CI=24,274-44,985) offshore in 2004.
Keywords
Line transect; Hazard-rate model; Uniform model; Half-normal model; Exponential model; Finless porpoise;
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