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Using Ocean Circulation Models to Explore Factors Influencing Variability in Hatchling Sea Turtle Dispersal
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Using Ocean Circulation Models to Explore Factors Influencing Variability in Hatchling Sea Turtle Dispersal

Morgan Jaime DuBois
University of West Florida Libraries
Master of Science (MS), University of West Florida
2020

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Abstract

When sea turtles hatch, they journey offshore to the open ocean. Currents are one of the factors that influence the success of this journey. The spatial ecology influencing hatchling turtles must be evaluated to protect them most effectively. Here, I examine how spatial, temporal, and climatological factors impact the dispersal of turtle hatchlings via ocean currents. I use the HYCOM global model combined with the Ichthyop particle simulator to measure the current driven dispersal of sea turtles. In a global analysis, spatial traits are a key factor driving dispersal. Annual variability in ocean currents also impact how far turtles can go. The differences in dispersal distance expand across sites and years the longer the turtles are in the water. I also evaluated the spatiotemporal variability in dispersal distance for the Gulf of Mexico endemic Kemp's Ridley sea turtle (Lepidochelys kempii) and related that variability to the frequency and severity of hurricanes. There are important spatiotemporal differences in dispersal that suggest varying levels of hatchling dispersal for each rookery. Further, increased frequency and intensity of hurricanes decreases the dispersal of hatchlings in the Gulf of Mexico. These findings can assist in model building and conservation planning for sea turtles worldwide.
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