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Relationship Between Winter Downwelling Conditions and Summer Hypoxia Severity Along the Oregon Coast

Creator:

Walters, Helen Marie

Abstract:

Hypoxia is a naturally occurring phenomenon that happens seasonally off the Oregon coast. As a consequence, there has been a great deal of research focused around analyzing the strength and duration of the hypoxic event during the summer season. This paper, however, takes an innovative approach by looking at the...

Resource Type:

Undergraduate Thesis and Presentation
Phosphorus control of nitrogen fixation

Creator:

Watkins-Brandt, Katie S.

Abstract:

Under conditions of fixed N-limitation, as with most oligotrophic systems, the process of biological N₂ fixation (diazotrophy) is favored, provided the necessary trace elements and vitamins are sufficient. Despite the well understood contributions of N₂ fixation in oligotrophic regions, the nutritional and ecological controls of marine diazotrophs have not been...

Resource Type:

Masters Thesis
Phosphorus physiology and environmental forcing of oceanic cyanobacteria, primarily Trichodesmium spp.

Creator:

White, Angelicque E.

Abstract:

The biological transformation of dinitrogen gas (N2) into combined forms(termed N2 fixation) by certain genera of oceanic cyanobacteria represents the largest incoming flux of nitrogen to the global ocean. As such, biological nitrogen fixation plays a significant role in the regulation of oceanic productivity and the export of carbon and...

Resource Type:

Dissertation