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Improving biodiversity monitoring by modeling relative abundance from "presence only" data

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  • Jingwa A, Brian

Abstract

One of the greatest concerns of this age is finding definitive ways to curb the loss of biodiversity. Although there have been growing calls on biodiversity protection and conservation by governments and institutions, the challenge lies on fitting models that best explain the trends of target species over space and time. The objective of this project was to determine the probability of detection of four species and how it changes with time during the season. Also, the occupancy of each species and its relationship with abundance was obtained. Siteoccupancy models were fitted to the data, with each model having four components; occupancy, colonization, extinction and detection probability. Model selection was done on the basis of the AIC criterion. The results show different trends for each species over time. The occupancies of each species do reflect the abundances in the various stages of their life cycles. The colonization, extinction and detection probability estimates were also obtained at each time point.

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Bibliographic Info

Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 35232.

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Date of creation: 12 Sep 2011
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Handle: RePEc:pra:mprapa:35232

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Keywords: Presence-only data; data modelling; site occupancy; colonization; extinction; detection probability; species abundance;

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