Graduate Thesis Or Dissertation
 

Management Applications of Remotely Sensed Dynamic Seascapes: Two Case Studies

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3x816t71w

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  • Dynamic seascapes, which are classified using a combination of remotely sensed data and model output, represent a potential tool for dynamic ecosystem-based management in marine systems. This work explores the utility of seascape classification in the context of marine resource management by examining two case studies: one involving biological relationships of species abundances and distributions to seascape classes in the California Current and another using seascapes to relate environmental variability to socioeconomic vulnerability in the Gulf of Alaska. In the first chapter, eight distinct seascape classes across a range of spatial and temporal scales are related to forage species assemblages on the continental shelf of California. Species and assemblage level associations with specific seascapes emerge. Despite a high number of ubiquitous species, seascapes are shown to have unique assemblages. Assemblage distinctness was strongest within the dominant seascape within 25km of trawl locations at a monthly temporal resolution. Occupancy likelihood within seascapes varied at the individual species level, resulting in positive and negative associations between key forage species like Northern Anchovy (Engraulis mordax), Pacific Sardine (Sardinops sagax), and juvenile rockfish (Sebastes spp.) and distinct seascape classes. The second chapter evaluates the ability of dynamic seascapes to represent the impact of multiple potential environmental stressors on the growth of early life stages of Pacific Cod (Gadus macrocephalus) and on the socioeconomic vulnerability of coupled human-natural systems in the Gulf of Alaska. Stress-scapes represent the dynamic footprint of Pacific Cod growth responses to changing partial pressure of carbon dioxide (pCO2) and sea-surface temperature (SST). Changing spatial extent of stress-scapes were associated with marine heatwave events and influenced the vulnerability of the social-ecological system of the GOA, resulting in changes to measured hazard and vulnerability for Alaskan communities at the Census Area level. Together these results show how dynamic seascapes can visualize and quantify the effects of environmental variability on living marine resources and how dynamic shifts in ocean habitat can translate to vulnerability across a diverse human socio-economic landscape. Future work can build on these methods and results to integrate dynamic seascape classification into existing and future ecosystem-based management and dynamic ocean management frameworks.
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  • Pending Publication
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  • 2020-11-24 to 2021-06-24

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