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- Creators: Arizona State University
- Resource Type: Text
Description
Species distribution modeling is used to study changes in biodiversity and species range shifts, two currently well-known manifestations of climate change. The focus of this study is to explore how distributions of suitable habitat might shift under climate change for shrub communities within the Santa Monica Mountains National Recreation Area (SMMNRA), through a comparison of community level to individual species level distribution modeling. Species level modeling is more commonly utilized, in part because community level modeling requires detailed community composition data that are not always available. However, community level modeling may better detect patterns in biodiversity. To examine the projected impact on suitable habitat in the study area, I used the MaxEnt modeling algorithm to create and evaluate species distribution models with presence only data for two future climate models at community and individual species levels. I contrasted the outcomes as a method to describe uncertainty in projected models. To derive a range of sensitivity outcomes I extracted probability frequency distributions for suitable habitat from raster grids for communities modeled directly as species groups and contrasted those with communities assembled from intersected individual species models. The intersected species models were more sensitive to climate change relative to the grouped community models. Suitable habitat in SMMNRA's bounds was projected to decline from about 30-90% for the intersected models and about 20-80% for the grouped models from its current state. Models generally captured floristic distinction between community types as drought tolerance. Overall the impact on drought tolerant communities, growing in hotter, drier habitat such as Coastal Sage Scrub, was predicted to be less than on communities growing in cooler, moister more interior habitat, such as some chaparral types. Of the two future climate change models, the wetter model projected less impact for most communities. These results help define risk exposure for communities and species in this conservation area and could be used by managers to focus vegetation monitoring tasks to detect early response to climate change. Increasingly hot and dry conditions could motivate opportunistic restoration projects for Coastal Sage Scrub, a threatened vegetation type in Southern California.
ContributorsJames, Jennifer (Author) / Franklin, Janet (Thesis advisor) / Rey, Sergio (Committee member) / Wentz, Elizabeth (Committee member) / Arizona State University (Publisher)
Created2014
Description
It has been identified in the literature that there exists a link between the built environment and non-motorized transport. This study aims to contribute to existing literature on the effects of the built environment on cycling, examining the case of the whole State of California. Physical built environment features are classified into six groups as: 1) local density, 2) diversity of land use, 3) road connectivity, 4) bike route length, 5) green space, 6) job accessibility. Cycling trips in one week for all children, school children, adults and employed-adults are investigated separately. The regression analysis shows that cycling trips is significantly associated with some features of built environment when many socio-demographic factors are taken into account. Street intersections, bike route length tend to increase the use of bicycle. These effects are well-aligned with literature. Moreover, both local and regional job accessibility variables are statistically significant in two adults' models. However, residential density always has a significant negatively effect on cycling trips, which is still need further research to confirm. Also, there is a gap in literature on how green space affects cycling, but the results of this study is still too unclear to make it up. By elasticity analysis, this study concludes that street intersections is the most powerful predictor on cycling trips. From another perspective, the effects of built environment on cycling at workplace (or school) are distinguished from at home. This study implies that a wide range of measures are available for planners to control vehicle travel by improving cycling-level in California.
ContributorsWang, Kailai, M.U.E.P (Author) / Salon, Deborah (Thesis advisor) / Rey, Sergio (Committee member) / Li, Wenwen (Committee member) / Arizona State University (Publisher)
Created2015
Description
I present a new framework for qualitative assessment of the current green purchasing practices of U.S. state governments. Increasing demand from citizens for green public purchasing has prompted state governments to adopt new, and improve existing, practices. Yet there has been little assessment of public green purchasing in academic research; what has been done has not provided the conceptual support necessary to assess green purchasing practices as a single component of the procurement process. My research aims to fill that gap by developing a conceptual framework with which to assess the status of green purchasing practices and by applying this framework to determine and describe the status of green purchasing in the five most populous U.S. states. The framework looks at state purchasing practices through the lenses of policy, policy implementation, and transparency.
ContributorsSharma, Lucky (Author) / Melnick, Rob (Thesis advisor) / Dooley, Kevin (Thesis advisor) / Basile, George (Committee member) / Arizona State University (Publisher)
Created2012
Description
The vast research in advertising discourse has extensively explored commercials on traditional media such as TV and printed magazines. However, less is known about the advertising discourse on social media platforms, especially across these platforms internationally. The social contemporary phenomenon of advertising via social media platforms is increasing rapidly because of their popularity among millions of users in Saudi Arabia. This dissertation represents a first attempt to cover the existing gap in previous research in terms of media platforms and international scope. It examines advertising discourse by three Saudi female social media influencers on Snapchat. The study uses mixed methods in data collection and analysis. The data include a survey identifying three outstanding media influencers in terms of their popularity and self-presentation as well as a total of 33 advertisements. The analytical framework employs Critical Discourse Analysis following Fairclough’s three-dimensional framework. It also draws upon multimodality analysis and identity construction analysis. Findings reveal noteworthy similarities and differences among the influencers’ advertisements including linguistic features, visual aspects, and identity representation. The influencers all construct a powerful relationship with their audiences which is reflected in their informal spoken and written texts through the frequent use of Arabic pronouns (e.g., we, you, and yours) and address terms like “girls”. The results further show that the influencers display power through using different discursive strategies to persuade the audience of the value of advertised products. This dissertation’s new insights contribute in important ways to the field of advertising discourse. The researcher claims that these new findings demonstrate the value of research associated with advertising through different social media platforms in their global context. Thus, future studies should examine commercials on online media by individuals regardless of their nationality with access to the media and the skills needed to create a product line and an audience moved by their promotion styles.
ContributorsBanjar, Halah (Author) / Adams, Karen L. (Thesis advisor) / James, Mark A. (Committee member) / Ali, Souad T. (Committee member) / Arizona State University (Publisher)
Created2023
Description
For this thesis, I analyzed the discourse and content of Proposition 22, a California law which defined all workers utilizing gig-based apps to sell services as independent contractors meaning they were not legally entitled to certain protections such as minimum wage. The law was overturned in court in 2020, however, the advertisements in favor of and discourse behind the law has had a continued impact on all workers. Because of this it is important to examine and conceptualize the ideologies behind the law in order to understand how it was able to pass in a state which tends to vote in favor of increasing employee rights and regulation of industries. To do so, I utilized two methods of analysis, a discourse analysis of legal documents and a content analysis of advertisements. The former revolves around analyzing the discourse and ideologies around two versions of the legislation which were shown to the public, while the latter analysis categorizes and examines the implications of various advertisements utilized by companies to support the proposition. Ultimately, gig companies created an effective campaign that was able to repackage neoliberal deregulation for the general public while actively misrepresenting information around the law leading to long lasting effects that continue to harm workers while lining the pockets of investors despite its overturning.
ContributorsRodriguez, Anthony (Author) / Broberg, Gregory (Thesis director) / Martin, Nathan (Committee member) / Barrett, The Honors College (Contributor) / School of Social Transformation (Contributor) / Historical, Philosophical & Religious Studies, Sch (Contributor)
Created2022-05
Description
This dissertation investigates a subtle yet complex contemporary issue of colorism in India that traces its ideological roots back in the British colonial period or even prior to that. It focuses on the issue of skin-color discrimination in urban Indian men, which is significantly under-researched. This project aims at investigating the issue of skin-color discrimination through analyzing a small corpus of thirteen YouTube commercials dating from 2005 to 2017 for men’s skin-lightening products of a popular skin-care brand called “Fair and Handsome” from a multimodal critical discourse analytic perspective. This study further aims to understand how the discourse of colorism is operating in these Indian commercials for men’s skin-lightening products, what kinds of semiotic and socio-cultural (discourse) elements are naturalizing the notion of “fairness,” and finally, how the construction of male gender is facilitated. Although the project’s main theoretical arc is critical discourse analysis (CDA), the methodological needs necessarily require drawing upon theoretical tools from advertisement analysis, multimodal analysis, gender studies, social psychology, history, cultural anthropology, race theory, and other related fields of study. After successfully facilitating an exhaustive analytical undertaking, this dissertation contributes to the understanding of colorism as more than intra-group racism in India and situates this perpetuating issue as a contemporary research target in the socio-cultural contexts of globalization and urbanization.
ContributorsMukherjee, Sayantan (Author) / Adams, Karen L. (Thesis advisor) / Gelderen, Elly van (Committee member) / James, Mark A. (Committee member) / Arizona State University (Publisher)
Created2019