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Response of early life stage bivalves to diurnal changes in carbon dioxide and dissolved oxygen concentrations

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dc.contributor.advisor Gobler, Christopher J en_US
dc.contributor.author Clark, Hannah Rose en_US
dc.contributor.other Department of Marine and Atmospheric Science en_US
dc.date.accessioned 2017-09-20T16:53:35Z
dc.date.available 2017-09-20T16:53:35Z
dc.date.issued 2015-12-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/77792 en_US
dc.description 70 pgs en_US
dc.description.abstract Highly productive and shallow coastal systems often experience metabolically-driven, diurnal variations in pH and dissolved oxygen (DO) concentrations. It has been suggested that worsening acidification and eutrophication-driven hypoxia will intensify the magnitude of diurnal changes by decreasing baseline pH and DO levels. Few studies, however, have investigated the concurrent effects of low pH and low DO on ecologically and socioeconomically important marine organisms inhabiting coastal ecosystems. My thesis was designed to assess the effects of diurnal patterns in acidification and hypoxia on the survival, growth, and development of the early life stages of three bivalves indigenous to the East Coast of North America: bay scallops (Argopecten irradians), hard clams (Mercenaria mercenaria), and eastern oysters (Crassostrea virginica). Bivalves were exposed to both continuous and diurnal fluctuations in low levels of pH and DO. Continuously acidified conditions reduced survival of juvenile bay scallops as well as larvae of all three species studied, slowed growth of larval bay scallops and eastern oysters, and delayed the development of bay scallop larvae, while continuously hypoxic conditions reduced the survival, growth, and development of larval bay scallops and development of larval hard clams. Though simultaneous exposure to both factors had significantly more negative effects than each factor independently, the effects on survival of bay scallop and hard clam larvae, hard clam development, and eastern oyster growth were antagonistic. The effects of diurnal exposure to acidified and hypoxic conditions were more complex. In some cases, diurnally acidified conditions eliminated or mitigated the negative effects of survival for larval bivalves. These benefits were sometimes lost when both pH and DO varied diurnally suggesting the fluctuations in both factors at the same time were too energetically costly and/or occurred too rapidly for the bivalves to physiologically compensate without experiencing adverse effects. Collectively, this study provides a more accurate representation of the responses of early life stage bivalves to future acidification and hypoxia in shallow, coastal systems and demonstrates that diurnal fluctuations in pH and DO represent a significant threat to the North Atlantic bivalve populations. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Biology en_US
dc.subject.other Bivalves, Diurnal, Hypoxia, Ocean acidification, Shellfish en_US
dc.title Response of early life stage bivalves to diurnal changes in carbon dioxide and dissolved oxygen concentrations en_US
dc.type Thesis en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Levinton, Jeffrey en_US
dc.contributor.committeemember Lopez, Glenn en_US

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