People in coastal cities around the world harvest seafood from local bays despite well-documented... more People in coastal cities around the world harvest seafood from local bays despite well-documented health risks. In cities such as San Diego, California, USA, much information about contaminants and human consumption patterns exists for finfish but is largely lacking for shellfish. This study sought to better understand shellfish contamination risks and human vulnerability to inform management and advisories. In summer 2018 and winter 2019, we sampled crustaceans for chemical contaminants and anthropogenic debris and throughout the year surveyed people harvesting from three public fishing piers around San Diego Bay. Of the emerging contaminants found, pyrethroids, benzylbutyl phthalate, PFOS and anthropogenic debris were in differing concentrations in the muscle and viscera of the California spiny lobster and two species of crabs. Combined with previous metal and organic contaminant data from the lobster, 22 contaminants were detected with 5 exceeding consumption thresholds and 8 lac...
Contaminant concentrations in filter-feeding shellfish may indicate the health of coastal waters ... more Contaminant concentrations in filter-feeding shellfish may indicate the health of coastal waters and consumption risks. Widespread expansion of the Pacific oyster (Crassostrea gigas) and its popularity as food make it a useful sentinel. We surveyed intertidal Pacific oysters in San Diego Bay, California for contaminants during summer 2018 and winter 2019. We compared contaminants in Pacific oyster to California mussel from California's State Mussel Watch Program (1993-2003) and human consumption thresholds. Contaminants such as neonicotinoid and chlorinated pesticides, selenium, and several metals were higher in Pacific oysters in summer, while PBDEs, benzylbutyl phthalate, and plastics were higher in winter. Contaminant levels were generally lower in Pacific oyster than mussel except for copper and zinc. Bay-wide PCB concentrations in oysters exceeded thresholds but individual samples (locations) also met or surpassed chlordane, PCB and PAH thresholds. Monitoring and risk assessments that consider species' biology, season, location, effects of multiple contaminants, and human consumption patterns will contribute to more effective consumption guidelines.
This article takes up a central theme in William H. Sewell Jr.'s Logics of History, the relat... more This article takes up a central theme in William H. Sewell Jr.'s Logics of History, the relationship between relatively durable structures or systems and the more fleeting and contingent moments of their formation, their reproduction, and occasionally their radical altering. The article seeks to highlight how this tension between generals and particulars lies at the heart of the theoretical and disciplinary divisions that Sewell's book seeks to overcome. Arguing that Sewell's partial reliance on a framework inspired by Ferdinand de Saussure is inadequate for the goals of the book, the article points out that an alternative approach derived from the writings of Charles Sanders Peirce is more in keeping with Sewell's objectives.
Journal of World-Systems Research, Vol. 20, No.2, 2014.
Includes Introduction by Ho-fung Hung, essays by David Pedersen, George Steinmetz, Bruce Cummings... more Includes Introduction by Ho-fung Hung, essays by David Pedersen, George Steinmetz, Bruce Cummings, Michael Schwartz, William H. Sewell, Jr., and Reply by Vivek Chibber.
People in coastal cities around the world harvest seafood from local bays despite well-documented... more People in coastal cities around the world harvest seafood from local bays despite well-documented health risks. In cities such as San Diego, California, USA, much information about contaminants and human consumption patterns exists for finfish but is largely lacking for shellfish. This study sought to better understand shellfish contamination risks and human vulnerability to inform management and advisories. In summer 2018 and winter 2019, we sampled crustaceans for chemical contaminants and anthropogenic debris and throughout the year surveyed people harvesting from three public fishing piers around San Diego Bay. Of the emerging contaminants found, pyrethroids, benzylbutyl phthalate, PFOS and anthropogenic debris were in differing concentrations in the muscle and viscera of the California spiny lobster and two species of crabs. Combined with previous metal and organic contaminant data from the lobster, 22 contaminants were detected with 5 exceeding consumption thresholds and 8 lac...
Contaminant concentrations in filter-feeding shellfish may indicate the health of coastal waters ... more Contaminant concentrations in filter-feeding shellfish may indicate the health of coastal waters and consumption risks. Widespread expansion of the Pacific oyster (Crassostrea gigas) and its popularity as food make it a useful sentinel. We surveyed intertidal Pacific oysters in San Diego Bay, California for contaminants during summer 2018 and winter 2019. We compared contaminants in Pacific oyster to California mussel from California's State Mussel Watch Program (1993-2003) and human consumption thresholds. Contaminants such as neonicotinoid and chlorinated pesticides, selenium, and several metals were higher in Pacific oysters in summer, while PBDEs, benzylbutyl phthalate, and plastics were higher in winter. Contaminant levels were generally lower in Pacific oyster than mussel except for copper and zinc. Bay-wide PCB concentrations in oysters exceeded thresholds but individual samples (locations) also met or surpassed chlordane, PCB and PAH thresholds. Monitoring and risk assessments that consider species' biology, season, location, effects of multiple contaminants, and human consumption patterns will contribute to more effective consumption guidelines.
This article takes up a central theme in William H. Sewell Jr.'s Logics of History, the relat... more This article takes up a central theme in William H. Sewell Jr.'s Logics of History, the relationship between relatively durable structures or systems and the more fleeting and contingent moments of their formation, their reproduction, and occasionally their radical altering. The article seeks to highlight how this tension between generals and particulars lies at the heart of the theoretical and disciplinary divisions that Sewell's book seeks to overcome. Arguing that Sewell's partial reliance on a framework inspired by Ferdinand de Saussure is inadequate for the goals of the book, the article points out that an alternative approach derived from the writings of Charles Sanders Peirce is more in keeping with Sewell's objectives.
Journal of World-Systems Research, Vol. 20, No.2, 2014.
Includes Introduction by Ho-fung Hung, essays by David Pedersen, George Steinmetz, Bruce Cummings... more Includes Introduction by Ho-fung Hung, essays by David Pedersen, George Steinmetz, Bruce Cummings, Michael Schwartz, William H. Sewell, Jr., and Reply by Vivek Chibber.
This symposium puts together five commentaries on The Specter of Capital from diverse disciplinar... more This symposium puts together five commentaries on The Specter of Capital from diverse disciplinary perspectives, together with chibber's response.
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Papers by David Pedersen