Graduate Thesis Or Dissertation
 

Oceanographic Drivers of Northern California Current Phytoplankton Communities and their Fatty Acid Composition: Implications for Northwest Fisheries

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hq37vx314

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  • Micro-plankton are a crucial component of pelagic food webs, responding rapidly to environmental changes, and providing a first step in the acquisition and transfer of nutrients to life in the ocean. In addition to the uptake of carbon, phytoplankton provide essential fatty acids (FAs) that can limit the growth of zooplankton, juvenile and larval fishes, and as a result can impact the growth and energetic condition of upper trophic level marine organisms. Thus, trends in FA production and spatial and temporal distributions are of great interest to marine ecosystem management. To better understand the variability in food quality in the northern California Current ecosystem, we quantified FA composition and micro and nano-plankton community composition (PCC) from archived samples that were collected along with nutrient, salinity, temperature, and chlorophyll-a data as part of a long-term research and monitoring program along the Newport Hydrographic line from 2014 through 2021. PCC was assessed with an imaging flow cytobot (IFCb); this instrument provides high taxonomic resolution, precise biovolume estimates, and high potential throughput to improve accuracy, spatial coverage, and timeliness of reporting to stakeholders. Our objectives were to determine the dominant seasonal and interannual patterns and drivers for both PCC and FA composition, and what PCC indicators were most useful for predicting FAs. We found distinct temperature-associated seasonal and interannual differences in both the PCC and FA composition, with strong negative correlations to diatoms and the known diatom biomarker 20:5n-3 and 16:1n-7. In addition, we found that the diatom: total biovolume ratio was strongly correlated with several well-accepted FA biomarkers for diatom production. Thus, using imaging flow cytometry and the development of fatty acid-relevant phytoplankton indicators, we hope to understand how changing ocean physical factors reverberate through lower trophic levels to affect energy availability to commercially and ecologically important fisheries and provide a robust indicator of energy availability to inform near-real time fisheries management.
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  • Intellectual Property (patent, etc.)
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  • 2023-03-24 to 2023-10-25

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