ENVIRONMENTAL AUDITING: Demonstration of Line Transect Methodologies to Estimate Urban Gray Squirrel Density

Abstract:

:/ Because studies estimating density of gray squirrels (Sciurus carolinensis) have been labor intensive and costly, I demonstrate the use of line transect surveys to estimate gray squirrel density and determine the costs of conducting surveys to achieve precise estimates. Density estimates are based on four transects that were surveyed five times from 30 June to 9 July 1994. Using the program DISTANCE, I estimated there were 4.7 (95% CI = 1.86-11.92) gray squirrels/ha on the Clemson University campus. Eleven additional surveys would have decreased the percent coefficient of variation from 30% to 20% and would have cost approximately $114. Estimating urban gray squirrel density using line transect surveys is cost effective and can provide unbiased estimates of density, provided that none of the assumptions of distance sampling theory are violated.KEY WORDS: Bias; Density; Distance sampling; Gray squirrel; Line transect; Sciurus carolinensis.

journal_name

Environ Manage

journal_title

Environmental management

authors

Hein EW

doi

10.1007/s002679900078

subject

Has Abstract

pub_date

1997-11-01 00:00:00

pages

943-7

issue

6

eissn

0364-152X

issn

1432-1009

pii

EM1815

journal_volume

21

pub_type

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