. Bulletin - Southern California Academy of Sciences. Science. 40 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 2. Division of the dorsal fin into three segments of equal height: a) top, b) center, and c) bottom. A Xenobalanus specimen is visible on the top segment of the fin. day). A total of 189 sightings were included in the analysis ( of total dolphin sightings, n = 221). Barnacle prevalence and position on dorsal fin.—Prevalence of Xenobalanus for each sighting was determined by dividing the number of photo-identified dolphins carrying one or more barnacles by the total number of dol
. Bulletin - Southern California Academy of Sciences. Science. 40 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 2. Division of the dorsal fin into three segments of equal height: a) top, b) center, and c) bottom. A Xenobalanus specimen is visible on the top segment of the fin. day). A total of 189 sightings were included in the analysis ( of total dolphin sightings, n = 221). Barnacle prevalence and position on dorsal fin.—Prevalence of Xenobalanus for each sighting was determined by dividing the number of photo-identified dolphins carrying one or more barnacles by the total number of dolphins photo-identified in that sighting (Kane et al, 2008). To determine imposition of barnacles on dorsal fins, the fin was divided into three segments of equal height (Fig. 2). The lower margin of the dorsal fin was defined as the straight line where the plane of the dorsal fin changes to that of the body. Data analyses.—Data analyses were performed using Statview , Microsoft Excel 2007; data on species distribution were plotted with ArcGIS Nonparametric statistics tests were performed due to non-normal distributions of data. Statistical significance was set at P < and two-tailed P values were calculated. Kruskal-Wallis test was used both to determine whether barnacle presence varied significantly over the years and between the seasons. Dunn's comparison test was used as a post-hoc analysis to determine differences between years. To determine whether there was a significant difference between barnacle presence on coastal and offshore bottlenose dolphins, nonparametric Mann-Whitney U test was used. Chi-square (% ) test of independence was used to determine if there was a relationship between barnacle presence and survey type (coastal/offshore). Results Field effort Barnacle occurrence was analyzed on a dataset of 204 coastal and 221 offshore surveys conducted in the years 1997-2002 and 2005-2007 (Bearzi et al 2009). A total of 823 h were spent searching for
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