Locations and predicted densities of harbor seals from aerial survey on 25 Aug 2005 in Disenchantment Bay, Alaska, USA.

<p>All seals are shown because pups are not distinguishable in August. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129798#pone.0129798.g002" target="_blank">Fig 2</a> for geographical references. Seal densities are on a gray scale from low (light gray) to high (black). The small black rectangles illustrate the surface coverage of geo-referenced aerial images taken during transects over the seal haul-out area when there was ≥5% ice coverage. The entire ship track is shown with the ship stopping at the northernmost point and then exiting closest to the eastern shoreline. The dotted line shows the route of the cruise ship with the stippled band representing the area within 400 m where seals are more likely to be disturbed and flush into the water (see text). The white dots mark actual locations of seals identified from the aerial images. Pupping phenology follows Jansen et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129798#pone.0129798.ref022" target="_blank">22</a>]. For graphical display, seal densities estimated at grid-cell centroids were smoothed using the kernel density tool in the spatial analyst extension of ArcMap (Version 10.0, Esri Inc., Redlands, CA)(see text).