Honors College Thesis
 

Evaluating white shark presence in Oregon’s coastal waters

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  • TEST WORK FOR ADA CONFORMING ALTERNATE VERSIONS. Copy of production work https://ir.library.oregonstate.edu/concern/honors_college_theses/2j62sd78d
  • Observations of white sharks (Carcharodon carcharias) are rare in Oregon waters, however, historical evidence indicates predictable seasonal presence. The time, location, and nature of white shark occurrences (where an occurrence is the spatial evidence of white shark presence from different data streams), especially when complemented by associated environmental characteristics, provide valuable information regarding species presence. By curating these available data and visualizing the relationships between occurrences and environmental variables, researchers can better interpret the limited observations to inform research efforts and gain insights into the roles this species plays in Oregon’s marine ecosystems and economies. Here, I developed a comprehensive summary of the available evidence of species presence in Oregon from white shark-human interactions, white shark-related marine mammal strandings, and acoustic detections of white sharks, as well as associated factors of habitat suitability. With all the data combined, I found that white sharks are more prevalent off the Oregon coast in the fall, between September and December, with species relative occurrence highest in October and lowest in May. This study has advanced our understanding of the broader datasets of white shark presence in Oregon and can inform future directed studies.
  • Keywords: White shark, acoustic tagging, stranding, human-shark interactions, Geographic Information Systems (GIS)
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