(Color online) Map of study area (image from Google Earth, ©2007 Europa Technologies, Image ©2007 New Hanover County, NC).
Environmental daytime noise level profile for the Wilmington, North Carolina ICW (June–September 2001).
Mean received sound pressure levels by hour of the day; standard error bars are shown for each data point.
Mean received sound pressure level by day of the week; standard error bars are shown for each data point.
Noise Index plot.
Mean number of boats observed averaged per daytime hour; standard error bars are shown for each data point.
Mean number of hourly boat totals observed, averaged per day of the week; standard error bars are shown for each data point.
Percent occurrence of various vessel types and maximum received sound levels of each type.
Total number of dolphins observed and expected on weekdays versus weekends (based on survey effort) in the Wilmington ICW between Masonboro Inlet and Carolina Beach Inlet from June 2001 to September 2001 (, ).
Mean RLs for daytime and nighttime, , and Tursiops truncatus auditory threshold levels (extracted from Johnson (1967) as presented in Richardson et al. (1995).
Potential factors influencing received sound pressure levels in the Wilmington ICW (, , ).
Generating the Noise Index (all values rounded): (A) Regression results and weighting calculations; (B) eigenvector chart (prime values indicate weighted principal components).
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