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Harbor seals have been listed as a species likely to benefit from new Marine Protected Areas (MPAs) in California as part of the Marine Life Protection Act. Whereas seals may experience direct and indirect effects from these MPAs as a whole, the impacts of individual MPAs remains unclear. To support the analysis of the impacts of one new MPA located in South Humboldt Bay (SHB), California, I conducted two studies to measure the site fidelity of individual harbor seals within SHB and to describe the changes in distribution and abundance of hauled-out seals inside and outside the new MPA there. From June 2011 through May 2012, I used radio telemetry to assess site fidelity of 28 individually tagged seals. Most seals had high fidelity (>75%) for SHB haul-outs, indicating that these seals are present enough to potentially benefit from added protection. However, the use of radio telemetry proved difficult and costly for long-term data collection. Therefore, weekly visual surveys were implemented beginning in July 2012 to track the habitat use of all seals hauled-out in SHB. There were significant seasonal differences in seal abundance (ANOVA, F5 = 4.047, p
Coastal ecosystems are under intense pressure from anthropogenic and environmental factors in California. Human development, pollution and climate change continue to degrade coastal habitats. Marine predators such as marine mammals that depend on nearshore ecosystems are at risk from these anthropogenic and environmental factors. The Pacific harbor seal (Phoca vitulina richardsi) is one of the most common marine mammals along the coast of northern California and likely to be heavily impacted by changes in the coastal environment, yet little is known about their foraging behavior or habitat use. To accurately predict the response of local marine predators to changes in the coastal environment an understanding of their foraging behavior is required.