WorldCat Identities

Yang, Sylvia

Works: 12 works in 16 publications in 1 language and 251 library holdings
Genres: Educational films  Short films  History  Academic theses 
Roles: Author
Classifications: QK495.Z7,
Publication Timeline
Most widely held works by Sylvia Yang
The biggest investor in the U.S. is ... the U.S.( Visual )

1 edition published in 2017 in English and held by 118 WorldCat member libraries worldwide

Oct. 16 -- How did the U.S. government pull itself out of the financial crisis of 2008? By investing in itself. Jon Ferro of Bloomberg News explains how government bonds played an integral role in getting markets back on track. (video by Michael Byhoff and Sylvia Yang)
Bonds are more than 500 years old and bigger than ever( Visual )

1 edition published in 2017 in English and held by 118 WorldCat member libraries worldwide

Oct. 02 -- Did you know that the price of bonds can affect everything from how much mortgage interest you pay to how much money is in your retirement fund? Bloomberg's Jon Ferro explains how bonds make the world's economy turn. (video by Michael Byhoff and Sylvia Yang)
Effects of Zostera marina roots and leaf detritus on the concentration and distribution of pore-water sulfide in marine sediments by Alexandra G Simpson( Book )

2 editions published in 2016 in English and held by 2 WorldCat member libraries worldwide

Sulfide toxicity is implicated in seagrass declines worldwide. Studies examining the relationship between seagrass presence and sulfide concentrations have yielded conflicting results. Interpretation of the seagrass-sulfide relationship is complicated due to the opposing effects of the root system which can increase sulfide oxidation and the burial of organic matter from the plant itself which can increase sulfide production. To quantify the impact of eelgrass leaf detritus and the Zostera marina rhizosphere on pore-water sulfide concentrations, field samples of pore-water sulfide were collected in areas with and without eelgrass. To decouple the effects of live versus dead eelgrass tissue, laboratory studies were conducted over 4 weeks using 10 aquaria with or without eelgrass shoots and 0-8 pieces of Z. marina detritus located at 4 cm and 11 cm depth. Diffusive Gradients in Thin-Films (DGTs) were used to obtain 2D visualizations of sulfide concentrations within the sediment in relation to location of eelgrass detritus and the rhizosphere. In the field study, the presence of leaf detritus accounted for higher than average sulfide concentrations in the sediment. In the laboratory study, the presence of live eelgrass shoots resulted in higher overall sulfide concentrations compared to aquaria without eelgrass. Sulfide concentrations increased with higher mass of added detritus compared to locations where no detritus was added. Sediment within the rhizosphere exhibited reduced sulfide concentrations compared sediment outside the rhizosphere. It is likely that seagrasses are simultaneously increasing and decreasing sulfide concentrations depending on the location analyzed relative to the rhizosphere or buried eelgrass detritus
Ecosystem engineering by eelgrass (Zostera marina) leads to population feedbacks in certain environmental contexts by Sylvia Yang( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

Effects of hypoxia and sulfide intrusion on eelgrass (Zostera marina) by Melissa Ciesielski( Book )

2 editions published in 2015 in English and held by 2 WorldCat member libraries worldwide

Eelgrass, Zostera marina, provides critical habitat for many marine species in the Pacific Northwest. Although most eelgrass beds in the Salish Sea are stable, a few areas are experiencing decline. One region experiencing eelgrass decline is Hood Canal, a region that also has frequent hypoxic events. Hypoxia has the potential to be a stressor to eelgrass as it can lead to tissue anoxia at night. These tissues then must undergo anaerobic metabolism, which is less energetically efficient and can produce toxic byproducts. Hypoxia may also work in synergy with other stressors, such as sediment pore-water sulfide. Hypoxia can facilitate the intrusion of sulfide, a known phytotoxin, into eelgrass tissues. Pore-water sulfide has been found in elevated concentrations in the Puget Sound associated with wood waste and reductions in eelgrass density. Additionally, elevated pore-water sulfide has been found at sites in the San Juan Archipelago where eelgrass has declined. Furthermore, hypoxic events and elevated pore-water sulfide can co-occur as a result of eutrophication. In order to better understand the processes that lead to eelgrass decline across Puget Sound, this study examined the interaction between sulfide and hypoxia on the growth and photosynthetic efficiency of Zostera marina. Eelgrass shoots were collected from Padilla Bay, Washington and placed into seawater tanks in 18 oz. cups of sediment with a disk of agar at the bottom to simulate organic enrichment and to stimulate sulfide production. The growth rate and photosynthetic efficiency of the eelgrass shoots were monitored weekly for six weeks. After week three, the water columns of six of the tanks were reduced to hypoxic conditions (L-1). During week 6, the oxygen concentration was dropped further to near anoxic conditions. After week 6, eelgrass tissue samples were collected for measurement of total sulfur, carbon, and nitrogen. The results indicated that hypoxia had a significant negative effect on Z. marina shoots, which was evidenced by strong reductions in growth rates and photosynthetic efficiencies. While there was no direct effect of pore-water sulfide on the shoots, it was evident that hypoxia enhanced sulfide intrusion into the shoots. However, intrusion was limited to below-ground tissues and the total sulfur content in the below-ground tissues was not correlated with the measured pore-water sulfide concentrations. These findings indicate that hypoxia in conjunction with sediment organic enrichment harms eelgrass health and enhances the intrusion of sulfide into plant tissues, over a wide range of pore-water sulfide concentrations
A study of pore-water sulfide and eelgrass (Zostera japonica and Zostera marina) in Padilla Bay, Washington by Annie Walser( )

2 editions published in 2014 in English and held by 2 WorldCat member libraries worldwide

Two species of eelgrass can be found in Padilla Bay, Washington (Zostera japonica and Zostera marina) and act as a bioindicators of ecosystem health. Many factors can contribute to the status of an eelgrass bed, including light, temperature, salinity, and nutrients. However, following several cases of seagrass die-off events worldwide, another factor is suspected to contribute to eelgrass health: pore-water sulfide. This study examined the relationships between Z. japonica, Z. marina, and pore-water sulfide in Padilla Bay and the effects of elevated pore-water sulfide concentrations on eelgrass. Forty sites were surveyed for eelgrass shoots and sulfide concentration profiles were measured at depths of 0 to 12 cm. A correlation was expected between eelgrass and the inventory of sulfide during August and September due to increased temperature and increased bacterial respiration as a result of higher quantities of organic matter accumulation. While the data hinted at patterns between eelgrass density and sulfide, there were no significant correlations found between Z. japonica and Z. marina and the inventory of sulfide from June 2013 through September 2013. This is perhaps due to relatively low concentrations of sulfide at the study sites and documented eelgrass tolerance to the concentration range, as well as the overall health of eelgrass in this location. To further examine the relationship between eelgrass and sulfide, Zostera japonica and Zostera marina were grown in sediment amended with sulfide in an outdoor laboratory tank to study growth response and photosynthetic yield. Eelgrass shoots were grown for four weeks under different sulfide manipulations and shoot growth was recorded weekly. Quantum efficiency of PSII in eelgrass shoots was measured by PAM fluorometry at the conclusion of the experiment. The growth rates of Z. japonica and Z. marina were significantly reduced in treatments with elevated sulfide concentrations. Manipulated concentrations of pore-water sulfide resulted in significantly lower growth rates among Z. japonica shoots treated with moderate and high levels of sulfide. The decrease in growth in both species suggests that elevated levels of pore-water sulfide have an impact on eelgrass in Padilla Bay. The average photosynthetic yield of the shoots for Z. japonica and Z. marina was lower in shoots treated with sulfide, although this difference was not statistically significant, suggesting the drop in growth was not due to chloroplast damage
Seagrasses (Zostera marina) and (Zostera japonica) display a differential photosynthetic response to TCO₂ : implications for acidification mitigation by Cale A Miller( )

2 editions published in 2016 in English and held by 2 WorldCat member libraries worldwide

Accidental experiments: ecological and evolutionary insights and opportunities derived from global change( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Abstract Humans are the dominant ecological and evolutionary force on the planet today, transforming habitats, polluting environments, changing climates, introducing new species, and causing other species to decline in number or go extinct. These worrying anthropogenic impacts, collectively termed global change, are often viewed as a confounding factor to minimize in basic studies and a problem to resolve or quantify in applied studies. However, these 'accidental experiments' also represent opportunities to gain fundamental insight into ecological and evolutionary processes, especially when they result in perturbations that are large or long in duration and difficult or unethical to impose experimentally. We demonstrate this by describing important fundamental insights already gained from studies which utilize global change factors as accidental experiments. In doing so, we highlight why accidental experiments are sometimes more likely to yield insights than traditional approaches. Next, we argue that emerging environmental problems can provide even more opportunities for scientific discovery in the future, and provide both examples and guidelines for moving forward. We recommend 1) a greater flow of information between basic and applied subfields of ecology and evolution to identify emerging opportunities; 2) considering the advantages of the 'accidental experiment' approach relative to more traditional approaches; and 3) planning for the challenges inherent to uncontrolled accidental experiments. We emphasize that we do not view the accidental experiments provided by global change as replacements for scientific studies quantifying the magnitude of anthropogenic impacts or outlining strategies for mitigating impacts. Instead, we believe that accidental experiments are uniquely situated to provide insights into evolutionary and ecological processes that ultimately allow us to better predict and manage change on our human-dominated planet. Synthesis Humans have an increasingly large impact on the planet. In response, ecologists and evolutionary biologists are dedicating increasing scientific attention to global change, largely with studies documenting biological effects and testing strategies to avoid or reverse negative impacts. In this article, we analyze global change from a different perspective, and suggest that human impacts on the environment also serve as valuable 'accidental experiments' that can provide fundamental scientific insight. We highlight and synthesize examples of studies taking this approach, and give guidance for gaining future insights from these unfortunate 'accidental experiments'
Under what conditions could eelgrass measurably drawdown carbon? : Relating carbon drawdown to pCO2, irradiance, and leaf area index of Zostera marina / by Tyler Tran by Tyler T Tran( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Seagrass meadows, common to coastal habitats, have been identified as potential short-term refugia for calcifying organisms from ocean acidification (OA).In nearshore, soft-sediment habitats of the Salish Sea, eelgrass (Zostera marina L.) is the dominant seagrass species, and several studies have found that eelgrass is effective at taking up inorganic carbon and maybe carbon-limited, potentially increasing uptake potential in the future. However, irradiance levels vary throughout a day and can therefore influence rates of carbon uptake and release through the relative rates of photosynthesis and respiration. Eelgrass meadows vary in terms of meadow size, shoot density and morphology, and water residence time which could affect rates of carbon uptake of eelgrass meadows and their influence on localized water chemistry.We conducted a series of mesocosm experiments manipulating pCO2, irradiance, and leaf area index (LAI)to assess how these factors interact and contribute to OA variability in the nearshore environment
Ghost of invasion past: legacy effects on community disassembly following eradication of an invasive ecosystem engineer( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: By changing ecosystem processes and altering the physical landscape, invasive ecosystem engineers can have substantial impacts on ecosystem functions and human economies and may facilitate other non‐native species. Eradication programs in terrestrial and aquatic systems aim to reverse the impacts of invasive species and return the system to its pre‐invasion conditions. Despite an extensive focus on the impacts of both native and non‐native ecosystem engineers, the consequences of removing invasive ecosystem engineers, particularly in coastal ecosystems, are largely unknown. In this study, we quantified changes in a benthic community following the eradication of the invasive ecosystem engineer, hybrid cordgrass Spartina, in San Francisco Bay, California. We used field experimental manipulations to test for persistent effects of both aboveground and belowground structural modifications of the invasive plant on the benthic community. We found significant effects of the invasive plant more than four years following eradication. Experimental modification of the above‐ vs. belowground structure of this ecosystem engineer revealed taxonomic specific effects resulting in hysteresis in the recovery of the benthic food webs. We found that these "legacy effects" resulted from two specific mechanisms: (1) delayed breakdown of belowground structures (stems, roots) and (2) persistence of other invasive species whose invasion was facilitated by the ecosystem engineer. Both of these mechanisms are likely to occur in similar systems where belowground structures breakdown more slowly or where other associated long‐lived invaders persist. Our work is among the first to quantify the slow rate of change in food web and community processes and the persistent legacy effects of an invasive ecosystem engineer in a coastal ecosystem. We suggest that this delayed transition to pre‐invasion conditions could resemble an alternate state that would be misidentified without a sufficient monitoring interval or recovery duration, with consequences for future management and restoration activity planning
Summary of the activities of the ERNCIP applied biometrics for security of CI thematic group( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

Biometric identity technology, such as fingerprint, iris or face recognition, is foreseen to become more and more common for access control to critical infrastructure and for travel documents. Test and evaluation presents challenges of scale because the required correct identification rates are often high and the acceptable false alarm rate low, so very many test data records must be run to determine the performance
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English (16)