Now showing items 21-30 of 111
The distribution of particulate organic carbon and sediment in the Elwha River dispersal system during the dam removal process
The delivery and deposition of particulate organic carbon (POC) into the marine environment via rivers impacts local biological and geological processes as well as the global carbon cycle. This is especially the case in small mountainous rivers, such as the Elwha River, Washington, which delivers a significant fraction of ...
Using 7Be and textual characteristics to trace the source of sediment in the Elwha Delta
The removal of the two dams on the Elwha River provides a large-scale backdrop for sediment transport research. The demolition will stimulate sediment-laden flows downstream, directly impacting the Elwha delta and the marine environment. This study uses two different tracers to track sediment movement along the Elwha River ...
Migration and feeding in intertidal whelks, N. ostrina and N. lamellosa
Our study seeks to gain more information on the migration and feeding patterns of two common intertidal carnivorous snails, Nucella lamellosa and Nucella ostrina. These whelks are native to the western coast of the United States ranging from California to Alaska and feed primarily on barnacles. The information from our ...
Effects of water source and mixing on phytoplankton dynamics within a tidally influenced system
Phytoplankters are primary producers and an important energy source within pelagic nearshore habitats. The growth of these organisms is affected by riverine-oceanic interactions. A measurable interaction over 24 hours is the density difference between these water sources, where less-dense riverine water is warmer and has lower ...
FA signatures of the diatom Skeletonema cf. marinoi: just how natural is culturing anyway?
Spatial subsidies including particulate organic matter (POM) play an important role in near-shore food web ecology. Fatty acid (FA) analysis has proven an effective tool for constructing these food webs, although the FA profiles of many marine autotrophs and the validity of culturing is still unknown. We cultured the diatom ...
Longshore Transport of Sediment in Freshwater Bay, West of Port Angeles
Using digital photographs, this study investigates sediment movement eastwards by the dominant northwest swell in Freshwater Bay, WA. Twenty samples were taken at five locations and analyzed with the Cobble cam analysis package. It was found that sand and smaller pebbles were more prevalent on the western updrift shore ...
Feeding responses of the mysid Archaeomysis grebnitzkii to fresh and aged blended Nereocystis luetkeana
The mysid Archaeomysis grebnitzkii is a small detrivorous crustacean that is prey to many low level consumers. In vitro, we fed A. grebnitzkii fresh and aged blended Nereocystis luetkeana as well as a blend of phytoplankton and measured preference and differential growth between these diets. We were unable to detect feeding ...
Differences in gonad somatic indices with depth in Pacific Northwest invertebrates
Drift algal material exported from kelp beds plays a significant role in nearby ecosystems. Phenotypic traits such as gonad index and jaw diameter can be indicators of diet consistency and nutrient uptake and thus can be used to assess the possible role of exported kelp. In this study, individuals of an herbivorous ...
Bacteria Abundance in Response to Increasingly Acidic Conditions
The objective of this mesocosm experiment is to determine differences in bacteria abundance in normal (600μatm), medium (1000μatm), and high (1300μatm) CO2 concentrations. Mesocosms serve as an intermediate for lab and field studies; mesocosms provide insight about changes to food webs, communities, and ecosystems.
Vertical migration patterns of two marine snails: Nucella lamellosa and Nucella ostrina
Nucella ostrina and Nucella lamellosa are two species of predatory marine intertidal snail. They are common along the coast from California to Alaska, US and prey upon barnacles. We studied vertical migration and feeding patterns of each species and the best method for tagging them. We found that there was not much fluctuation ...