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Food Habits Of Harbor Seals (Phoca Vitulina Richardii) In San Francisco Bay, California, Corinne Michele Gibble
Food Habits Of Harbor Seals (Phoca Vitulina Richardii) In San Francisco Bay, California, Corinne Michele Gibble
Master's Theses
The diet of harbor seals (Phoca vitulina richardii) in San Francisco Bay (SFB) in California was examined from July 2007 to July 2008 via scat analysis. Scats were collected from five major haul-out sites; 22 species of fish and one species of crustacean were identified from 422 scats. The reliance of a non-native invasive species, Yellowfin Goby (Acanthogobius flavimanus), increased in importance in the diet. Additionally, another non-native invasive fish species, Chameleon Goby (Tridentiger trigonocephalus), was found for the first time in the diet of harbor seals in SFB. Harbor seal diet was compared between seasons, locations, and years using …
Life History Characteristics Of The Starry Skate, Raja Stellulata, From California Waters, Kelsey James
Life History Characteristics Of The Starry Skate, Raja Stellulata, From California Waters, Kelsey James
Master's Theses
The order Rajiformes, or skates, is a morphologically conservative group that exhibits a wide range of life history characteristics. This inter-species variability warrants species-specific research. This study investigates the age, growth, reproduction, and habitat of the Starry Skate, Raja stellulata, which is endemic to the U.S. West Coast. Age and growth parameters were determined using two preparation techniques: gross sectioning and histological sectioning. The assumption that gross sections deposit one band pair a year was indirectly validated with centrum edge analysis and marginal increment ratio. It was not indirectly validated with histological sections. Age estimates from gross sections ranged from …