數學系演講公告
主 講 人：黃文瀚 教授 
 (中興大學 統計學研究所) 
講    題：Estimating Abundance from Presence-Absence Maps
日    期：100年03月01日（星期二）下午2:30 – 3:20
地    點：數學系(科學館S433室)

摘    要：

An important question in macroecology is: Can we estimate a species' abundance 
from its occurrence on landscape? Answers to this question are useful for 
estimating population size from more easily acquired distribution data and for 
understanding the macroecological occupancy-abundance relationship. Several 
methods have recently been developed to address this question, but no method is 
general enough to provide a common solution to all species due to the wide 
variation in spatial distribution of species. In this study we developed a 
mixed Gamma-Poisson model that generalizes the negative binomial model and can 
characterize spatial dependence in the abundance distribution across cells. 
Under this framework, without any extra information, the clumping parameter and 
species abundance can be estimated using a map aggregation technique. This 
model was tested using a set of empirical census data consisting of 299 tree 
species from a 50 ha stem-mapped plot of Panama.



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