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Full-Text Articles in Marine Biology
Polyunsaturated Aldehyde Production By A Temporally Varying Field Assemblage Of Diatoms In The San Juan Island Archipelago: Can Diatom Metabolites Affect Microzooplankton Grazing?, Blair M. (Blair Michael) Paul
Polyunsaturated Aldehyde Production By A Temporally Varying Field Assemblage Of Diatoms In The San Juan Island Archipelago: Can Diatom Metabolites Affect Microzooplankton Grazing?, Blair M. (Blair Michael) Paul
WWU Graduate School Collection
The success of diatoms in a wide range of global habitats, together with common observations of the post-bloom sinking of diatom biomass, indicates that this taxon has evolved a mechanism to reduce the largest loss process for phytoplankton in the ocean, microzooplankton grazing. Recent research has shown that polyunsaturated aldehydes (PUAs), lipid oxidation products generated by various species of diatoms, can reduce copepod fecundity and egg hatching success. This leads to the question of whether PUAs adversely affect the major global consumers of phytoplankton, microzooplankton. In the late spring to early fall 2007, I used the seawater dilution technique to …
The Effects Of Season And Microhabitat On The Distribution And Nutritional Contributions Of Two Algal Symbionts In The Intertidal Anemone Anthopleura Xanthogrammica, Michael R. (Michael Rory) Levine
The Effects Of Season And Microhabitat On The Distribution And Nutritional Contributions Of Two Algal Symbionts In The Intertidal Anemone Anthopleura Xanthogrammica, Michael R. (Michael Rory) Levine
WWU Graduate School Collection
The intertidal sea anemone Anthopleura xanthogrammica is distributed widely along the Pacific coast, from Baja California Mexico (~30ºN) to southern Alaska (57ºN). In much of its range, A. xanthogrammica has the ability to co-host algal symbionts from two distinct taxa known as zoochlorellae (the chlorophyte Elliptochloris marina) and zooxanthellae (brown dinophytes in the genus Symbiodinium). Laboratory studies and field distributions have demonstrated that zoochlorellae and zooxanthellae represent "cool" and "warm" symbionts respectively, based on their relative temperature tolerances and intertidal distributions. This study examined the effects of two intertidal microhabitats on the seasonal distribution, density, and mitotic index of zoochlorellae …
Alien Vs. Predator: Effects Of A Native Predator On Two Invasive Oyster Drills And Oysters In Washington State, Emily W. Grason
Alien Vs. Predator: Effects Of A Native Predator On Two Invasive Oyster Drills And Oysters In Washington State, Emily W. Grason
WWU Graduate School Collection
I investigated the consumptive (CEs) and non-consumptive effects (NCEs) of a native crab predator (the red rock crab, Cancer productus) on a system of two invasive oyster drills (the Atlantic drill, Urosalpinx cinerea, and the Japanese drill, Ocinebrina inornata), a native oyster (the Olympia oyster, Ostrea lurida), and an introduced but commercially valuable oyster (the Pacific oyster, Crassostrea gigas). In the presence of chemical effluent from crabs eating conspecifics, drills increased hiding behavior by 2 to 6 times, and reduced the number of oysters consumed by 50 to 67%. This is consistent with an adaptive behavioral response and has the …
The Behavioral Response Of Harbor Seals To Seasonal Prey Pulses Of Spawning Pacific Herring, Austen C. Thomas
The Behavioral Response Of Harbor Seals To Seasonal Prey Pulses Of Spawning Pacific Herring, Austen C. Thomas
WWU Graduate School Collection
The Pacific harbor seal (Phoca vitulina) is a noteworthy omission from the list of predators that aggregate at herring spawning sites, despite strong suggestive evidence that they are likely to respond to herring pulses. Working with the hypothesis that spawning herring aggregations are seasonally important prey for harbor seals, we tested several predictions using an analysis of harbor seal prey remains, GPS telemetry, and satellite-linked time/depth recorder data. Contrary to predictions, herring in harbor seal diet was comprised of 77% juveniles and 23% adults in the spawn season, versus 33% juveniles and 67% adults in the post-spawn season. Seal diving …
Age Determination Of The Sixgill Shark From Hard Parts Using A Series Of Traditional And Novel Approaches, S. Jeffrey (Steven Jeffrey) Campbell
Age Determination Of The Sixgill Shark From Hard Parts Using A Series Of Traditional And Novel Approaches, S. Jeffrey (Steven Jeffrey) Campbell
WWU Graduate School Collection
Necessary to the management of any species of fish is the ability to determine age in individuals. Age information is used to establish growth rates, longevity, age at maturity, and population age structure, and to predict how population demographics will change over time. For most species of fish, reliable aging techniques have been in use since the early 20th century. Most boney fish are aged by counting bands of calcium phosphate hydroxyapatite that form over time in skeletal hard parts such as otoliths, fin-spines, and scales, which can be used as proxies for age in years. Fishes in the Class …
Grazing Interactions Between Oxyrrhis Marina And Synechococcus Strains Grown In Single Nitrogen Sources, Virginia. Selz
Grazing Interactions Between Oxyrrhis Marina And Synechococcus Strains Grown In Single Nitrogen Sources, Virginia. Selz
WWU Graduate School Collection
The goal of this study was to assess the interaction between abiotic and biotic factors on diverse Synechococcus strains isolated from the coastal California Current (CC9311, CC9605, CC9902) and the oceanic Sargasso Sea (WH8102 and mutants: JMS40 and SIO7B). Previous research has demonstrated that abiotic factors, such as nutrient source or concentration, can alter cellular structure and chemistry. These cell characteristics in turn influence biotic factors such as predation by protozoan grazers. Synechococcus strains isolated from coastal and open ocean waters were grown to nitrogen (N) depletion in N-reduced medium. After reaching stationary phase, strains were transferred to media containing …