Percent time at dissolved oxygen levels for tagged white sharks.

<p>Histograms of percent time at dissolved oxygen levels for the entire tracking period for tags (A) tag 18M, (B) tag 30M, (C) tag 40M and (D) tag 41F. White lines indicate days with no data. The colored bars at the bottom indicate red for time at Guadalupe Island, white for traveling and green for time in the SOFA.</p

Characteristic offshore vertical profiles indicating dive behaviors in the SOFA and while traveling.

<p>Ambient temperature-depth profiles for one week with typical vertical behavior for (A) male 40M while in the SOFA and (B) female 41F while traveling to Hawaii. Color denotes ambient temperature. Light grey denotes nighttime.</p

Day and night temperature distributions for tagged white sharks while offshore.

<p>Plot of percent time of day and night temperature distribution for tags (A) 18M, (B) 30M, (C) 40M, (D) 41F.</p

World Ocean Atlas 2005 dissolved oxygen levels in the eastern North Pacific.

<p>Mean O₂ levels in the Eastern Pacific (A) at 400 m for the month of June with the white circle representing the approximate location of the SOFA, and (B) the profile of O₂ at depth along 25.5° N latitude. Color indicates changes in mean O₂ levels.</p

Depth and inferred oxygen profiles.

<p>Vertical profile showing estimated O₂ levels experienced at depth for tag (A) 41F and (B) 18M shortly after leaving Guadalupe Island.</p

Tagging data for recovered white shark pop-up satellite tags deployed at Guadalupe Island Mexico.

a<p>Photo-ID numbers are from Domeier & Nasby-Lucas <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0008163#pone.0008163-Domeier2" target="_blank">[17]</a>.</p>b<p>DAL indicates the number of days that the tag was on the shark.</p

V_activity20 values for tagged Guadalupe Island white sharks.

<p>V_activity20 values for tagged Guadalupe Island white sharks.</p

Day and night depth distributions for tagged white sharks while offshore.

<p>Plot of percent time of day and night depth distribution for tags (A) 18M, (B) 30M, (C) 40M, (D) 41F.</p

Offshore movement patterns for tagged white sharks.

<p>Calculated tracks for (A) tag 18M, (B) tag 30M, (C) tag 40M, and (D) tag 41F. The black line indicates the 50% fixed kernel contour for previous pop-up satellite archival tag pop-up points in the SOFA (Domeier & Nasby-Lucas 2008). Colors indicate months.</p

Image_1_Basking Shark (Cetorhinus maximus) Movements in the Eastern North Pacific Determined Using Satellite Telemetry.PDF

<p>To fill data gaps on movements, behaviors and habitat use, both near- and offshore, two programs were initiated to deploy satellite tags on basking sharks off the coast of California. Basking sharks are large filter-feeding sharks that are second in size only to whale sharks. Similar to many megafauna populations, available data suggest that populations are below historic levels. In the eastern North Pacific (ENP) Ocean, the limited information on basking sharks comes from nearshore habitats where they forage. From 2010 to 2011, four sharks were tagged with pop-off satellite archival tags with deployments ranging from 9 to 240 days. The tags provided both transmitted and archived data on habitat use and geographic movement patterns. Nearshore, sharks tended to move north in the summer and prefer shelf and slope habitat around San Diego, Point Conception and Monterey Bay. The two sharks with 180 and 240 days deployments left the coast in the summer and fall. Offshore their paths diverged and by January one shark had moved to near the tip of the Baja Peninsula, Mexico and the other to the waters near Hawaii, USA. Vertical habitat use was variable both within and among individuals and changed as sharks moved offshore. Nearshore, most time was spent in the mixed layer but sharks did spend hours in cold waters below the mixed layer. Offshore vertical movements depended on location. The shark that went to Hawaii had a distinct diel pattern, with days spent at ~450–470 m and nights at ~250–300 m and almost no time in surface waters, corresponding with the diel migration of a specific portion of the deep scattering layer. The shark that moved south along the Baja Peninsula spent progressively more time in deep water but came to the surface daily. Movement patterns and shifts in vertical habitat and use are likely linked to shifts in prey availability and oceanography. Data collected indicate the potential for large-scale movements and the need for international dialogue in any recovery efforts.</p