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Thesis - Campus Access Only
Master of Science (MS)
Moss Landing Marine Laboratories
foraging, satellite telemetry, seabirds, winds
Marine predators forage in a heterogeneous landscape where prey patches are unevenly
distributed. Predators return to larger scale areas of consistent productivity such as the
California Current, and search at finer temporal and spatial scales to locate prey patches.
One of the most abundant avian marine predators in the California Current is the sooty
shearwater. Sooty shearwaters leave southern hemisphere islands at the end of the
breeding season in the southern autumn. They arrive in the California Current after
completing a trans-hemispheric migration, in need of replenishing body condition. Sooty
shearwaters are adapted for efficient flight, and their flight is highly correlated with
winds. Shearwaters in this study appeared to use winds opportunistically, and responded
by vacating foraging hotspots following a reversal in winds, often flying more
economically in a downwind direction. Shearwaters also used headwind and tailwind
flight much more frequently than expected. This was a result of constraints of a northsouth
oriented coastline, and available winds. Sooty shearwaters travelled synchronously
while foraging in the CC and when departing on the southern migration. The cue to
depart on the southern migration was likely a combination of factors of phenology, local
enhancement and body condition.
Nakagawa, Melinda, "Sooty Shearwater (Puffinus griseus) Response to Wind Variability in the California Current" (2014). Master's Theses. 4506.