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Activity Number: 368
Type: Invited
Date/Time: Wednesday, August 6, 2008 : 8:30 AM to 10:20 AM
Sponsor: Section on Statistics and the Environment
Abstract - #301048
Title: Hierarchical Models for the Estimation of Manatee Abundance from Aerial Surveys
Author(s): Robert M. Dorazio*+
Companies: U.S. Geological Survey/University of Florida
Address: Department of Statistics, Gainesville, FL, 32611-0339,
Keywords: Abundance ; Aerial survey ; Double-observer sampling ; Habitat ; Manatee ; Removal sampling
Abstract:

Predictions of manatee abundance as a function of habitat characteristics are needed for making conservation decisions for this threatened species. The spatial distribution of manatees in southwest Florida varies seasonally in response to changes in salinity, water temperature, food availability, and other factors related to habitat. Consequently, aerial surveys were developed to estimate abundance of manatees in spatially referenced sample units using a combination of sampling protocols. Groups of manatees were detected using double-observers, and the number of manatees in each group were detected by repeated circling to yield a sequence of "removal" counts. Thus, both kinds of counts (i.e., those of groups and those of manatees within groups) were spatially referenced.

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Revised September, 2008