Spatial distribution of cold-induced death events in passive (a) and active (b) turtles.

<p>Spatial distribution of cold-induced death events in passive (a) and active (b) turtles.</p

Circular histogram of the daily swimming velocities.

<p>This histogram includes the daily swimming velocities of all active turtles found between 120°E and 140°W and north of 25°N. The color in each 10°-wide heading bin reflects the number of daily swimming velocities found in this bin. This number is normalized so that the most populated bin has an index of 100.</p

Normalized rate of food consumption <i>F</i>_<i>0</i>(<i>a</i>)as a function of age.

<p>Normalized rate of food consumption <i>F</i>_<i>0</i>(<i>a</i>)as a function of age.</p

Maps of habitat suitability index.

<p>Maps for 1- and 9-year-old leatherbacks during winter (January to March) and summer (July to September).</p

Mean value of the NPP encountered by active turtles crossing the Pacific alive.

<p>The food requirement curve <i>F</i>(<i>a</i>) is that of individuals born at the peak of the emergence period, that is on September 15 of the first simulated year. Tags with the mean longitude of the simulated turtles are inserted at various simulation times to establish the link between the position and simulation time.</p

Histogram of the North Pacific crossing times (PCT) for (a) passive and (b) active turtles.

<p>Histogram of the North Pacific crossing times (PCT) for (a) passive and (b) active turtles.</p

Schematic map of surface currents in the North Pacific.

<p>NECC: North Equatorial Countercurrent; NEC: North Equatorial Current; HE Halmahera Eddy; ME: Mindanao Eddy; KEC: Kuroshio Extension Current; NPC: North Pacific Current; NPTZ: North Pacific Transition Zone. Underlying current speeds are those of the G1 ocean reanalysis on October 1^st, 2002.</p

Simulated 18-year long trajectories of (a) passive and (b) active leatherbacks dispersing in the North Pacific.

<p>Individuals are released offshore Jamursba-Medi nesting beach (white dot on the map). The color along each track evolves with the age of the simulated turtle.</p

Thermal habitat suitability index as a function of water temperature.

<p>Thermal habitat suitability index as a function of water temperature.</p

Number of turtle days in 1°x1° boxes for (a) the passive and (b) the active dispersal simulations.

<p>Number of turtle days in 1°x1° boxes for (a) the passive and (b) the active dispersal simulations.</p