Matching Items (170)
Grasshoppers Regulate N: P Stoichiometric Homeostasis by Changing Phosphorus Contents in Their Frass
Description
Nitrogen (N) and phosphorus (P) are important limiting nutrients for plant production and consumer performance in a variety of ecosystems. As a result, the N:P stoichiometry of herbivores has received increased attention in ecology. However, the mechanisms by which herbivores maintain N:P stoichiometric homeostasis are poorly understood. Here, using a field manipulation experiment we show that the grasshopper Oedaleus asiaticus maintains strong N:P stoichiometric homeostasis regardless of whether grasshoppers were reared at low or high density. Grasshoppers maintained homeostasis by increasing P excretion when eating plants with higher P contents. However, while grasshoppers also maintained constant body N contents, we found no changes in N excretion in response to changing plant N content over the range measured. These results suggest that O. asiaticus maintains P homeostasis primarily by changing P absorption and excretion rates, but that other mechanisms may be more important for regulating N homeostasis. Our findings improve our understanding of consumer-driven P recycling and may help in understanding the factors affecting plant-herbivore interactions and ecosystem processes in grasslands.
ContributorsZhang, Zijia (Author) / Elser, James (Author) / Cease, Arianne (Author) / Zhang, Ximei (Author) / Yu, Qiang (Author) / Han, Xingguo (Author) / Zhang, Guangming (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2014-08-04
Description
A large fraction of the world grasslands and savannas are undergoing a rapid shift from herbaceous to woody-plant dominance. This land-cover change is expected to lead to a loss in livestock production (LP), but the impacts of woody-plant encroachment on this crucial ecosystem service have not been assessed. We evaluate how tree cover (TC) has affected LP at large spatial scales in rangelands of contrasting social–economic characteristics in the United States and Argentina. Our models indicate that in areas of high productivity, a 1% increase in TC results in a reduction in LP ranging from 0.6 to 1.6 reproductive cows (Rc) per km[superscript 2]. Mean LP in the United States is 27 Rc per km[superscript 2], so a 1% increase in TC results in a 2.5% decrease in mean LP. This effect is large considering that woody-plant cover has been described as increasing at 0.5% to 2% per y. On the contrary, in areas of low productivity, increased TC had a positive effect on LP. Our results also show that ecological factors account for a larger fraction of LP variability in Argentinean than in US rangelands. Differences in the relative importance of ecological versus nonecological drivers of LP in Argentina and the United States suggest that the valuation of ecosystem services between these two rangelands might be different. Current management strategies in Argentina are likely designed to maximize LP for various reasons we are unable to explore in this effort, whereas land managers in the United States may be optimizing multiple ecosystem services, including conservation or recreation, alongside LP.
ContributorsAnadon, Jose Daniel (Author) / Sala, Osvaldo (Author) / Turner II, B. L. (Author) / Bennett, Elena M. (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor) / School of Geographical Sciences and Urban Planning (Contributor)
Created2014-09-02
Description
We studied the microbial community structure of pilot two-stage membrane biofilm reactors (MBfRs) designed to reduce nitrate (NO[subscript 3]–) and perchlorate (ClO[subscript 4]–) in contaminated groundwater. The groundwater also contained oxygen (O[subscript 2]) and sulfate (SO[2 over 4]–), which became important electron sinks that affected the NO[subscript 3]– and ClO[subscript 4]– removal rates. Using pyrosequencing, we elucidated how important phylotypes of each “primary” microbial group, i.e., denitrifying bacteria (DB), perchlorate-reducing bacteria (PRB), and sulfate-reducing bacteria (SRB), responded to changes in electron-acceptor loading. UniFrac, principal coordinate analysis (PCoA), and diversity analyses documented that the microbial community of biofilms sampled when the MBfRs had a high acceptor loading were phylogenetically distant from and less diverse than the microbial community of biofilm samples with lower acceptor loadings. Diminished acceptor loading led to SO[2 over 4]– reduction in the lag MBfR, which allowed Desulfovibrionales (an SRB) and Thiothrichales (sulfur-oxidizers) to thrive through S cycling. As a result of this cooperative relationship, they competed effectively with DB/PRB phylotypes such as Xanthomonadales and Rhodobacterales. Thus, pyrosequencing illustrated that while DB, PRB, and SRB responded predictably to changes in acceptor loading, a decrease in total acceptor loading led to important shifts within the “primary” groups, the onset of other members (e.g., Thiothrichales), and overall greater diversity.
ContributorsOntiveros-Valencia, Aura (Author) / Tang, Youneng (Author) / Zhao, Heping (Author) / Friese, David (Author) / Overstreet, Ryan (Author) / Smith, Jennifer (Author) / Evans, Patrick (Author) / Rittmann, Bruce (Author) / Krajmalnik-Brown, Rosa (Author) / Biodesign Institute (Contributor) / Swette Center for Environmental Biotechnology (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2014-07-01
Description
The business of residential real estate is booming; over 5 million homes were sold in the United States in 2017 alone, according to the National Association of REALTORS® (“Quick Real Estate Statistics,” 2018). With the recovery of the housing market after the 2008 crash, more home buyers and sellers seek out real estate agents to assist with their transactions. Despite the majority of home buyers and sellers still using agents to conduct transactions, obstacles for fostering positive relationships come in the form of poor agent ethical reputations (Pacelle, 1994), agent empathy (Snyder et al, 2011), and even agent attractiveness (S.P. Salter et al, 2012). These reasons make it all the more critical that agents stand out from competitors, raising the question of how agents can differentiate themselves from other agents. To answer this question, this thesis seeks to discover what clients and agents value the most in their relationship with each other. In this study, three real estate agents and a client or client-couple from each were interviewed about the agent’s personality, brand promise, and actions taken to convey the promise. The most important factors in developing relationships, as well as a theoretical framework for the different relationships that can be formed within the agent-client context, were derived from the interview data collected. Commercial friendship develops from the overlap of all three relationship factors identified in the study, and as previously found, correlates with client loyalty and relationship quality (Lou, Zhou & Zheng, 2011). By shaping service around such factors, agents may be able to form better relationships with their clients. An agent with a stronger relationship with their clients may be more likely to receive referrals, earn customer loyalty, and even capture the attention of a first-time home buyer without the use of referral.
ContributorsVolpe, Kaylie Ann (Author) / Gray, Nancy (Thesis director) / Eaton, Kate (Committee member) / Herberger Institute for Design and the Arts (Contributor) / Department of Marketing (Contributor) / Barrett, The Honors College (Contributor)
Created2018-12
Description
Gendered products are prevalent in the modern consumer products market. This paper provides historical context for the change in the consumer products market which started as a genderless product market and shifted to a female consumer-centric market reflecting the economic needs of the United States through World War I and II. This female consumer-centric market results from the rise of consumer research and many household products are created to satisfy female consumer preferences. But as the consumer demographics change with more women entering the labor force, the types of products being sold change to appeal to the increasing number of male consumers who begin shopping for themselves. This increase in male products is what leads to the booming men's personal care products market that we see today. With an increase in gendered products, there has also been an increase in the number of backlash companies face for creating specific gendered products. This paper outlines the history of gendered products and the potential future of products in the United States.
ContributorsLavergne, Lisa (Author) / Foster, William (Thesis director) / Goegan, Brian (Committee member) / Economics Program in CLAS (Contributor) / The Design School (Contributor) / Herberger Institute for Design and the Arts (Contributor) / Department of Psychology (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
The advertising agency, in its variety of forms, is one of the most powerful forces in the modern world. Its products are seen globally through various multimedia outlets and they strongly impact culture and economy. Since its conception in 1843 by Volney Palmer, the advertising agency has evolved into the recognizable—and unrecognizable—firms scattered around the world today. In the United States alone, there are roughly 13.4 thousand agencies, many of which also have branches in other countries. The evolution of the modern advertising agency coincided with, and even preceded, some of the major inflection points in history. Understanding how and why changes in advertising agencies affected these inflection points provides a glimpse of understanding into the relationship between advertising, business, and societal values.
In the pages ahead we will explore the future of the advertising industry. We will analyze our research to uncover the underlying trends pointing towards what is to come and work to apply those explanations to our understanding of advertising in the future.
In the pages ahead we will explore the future of the advertising industry. We will analyze our research to uncover the underlying trends pointing towards what is to come and work to apply those explanations to our understanding of advertising in the future.
ContributorsHarris, Chase (Co-author) / Potthoff, Zachary (Co-author) / Gray, Nancy (Thesis director) / Samper, Adriana (Committee member) / Department of Information Systems (Contributor) / Department of Marketing (Contributor) / Herberger Institute for Design and the Arts (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Streetwear is a category of fashion that has evolved from being a niche style of dress influenced by American counter cultures, into a formidable industry. Over time, Streetwear has become a culture in itself whose members are critical of inauthentic brands and commercialization. Streetwear brands have the need to be perceived as authentic, exclusive, and being connected to celebrity to survive in the industry long-term. Additionally, as the industry grows larger, the marketplace has become increasingly saturated. This can be attributed to how easy it is to create a fledgling streetwear brand due to advances in garment production technology and streetwear's roots in low-cost clothing. Streetwear brands need to differentiate themselves in an effective manner to stand out to consumers in the saturated streetwear market. Primary research conducted via a survey administered to streetwear consumers was done to learn more about the effectiveness of popular tactics and marketplace events streetwear brands use to differentiate themselves. Secondary research was done in literature on the topics of creativity and energized differentiation. Research by Gerzema and Lebar presented in their book The Brand Bubble on the topic of energized differentiation is reviewed and applied to streetwear brands. This thesis will discuss the key elements brands need to have to be successful in the streetwear industry. Along with this, it will also look at the effectiveness of specific tactics bands can execute to effectively differentiate themselves in the saturated industry and the important role creativity plays in their success.
ContributorsGriblin, Austin W. (Author) / Ostrom, Amy (Thesis director) / Samper, Adriana (Committee member) / Department of Marketing (Contributor) / Herberger Institute for Design and the Arts (Contributor) / W.P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
DescriptionTwo gender-neutral products developed and sold by IKEA were studied in order to learn about the development of such items, as well as what makes gender-neutral products appealing to consumers.
ContributorsDaryanani, Sapna Sonu (Author) / Gray, Nancy (Thesis director) / Lisjak, Monika (Committee member) / Department of Marketing (Contributor) / Herberger Institute for Design and the Arts (Contributor) / W. P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
Description
The objective of this creative project was to gain experience in digital modeling, animation, coding, shader development and implementation, model integration techniques, and application of gaming principles and design through developing a professional educational game. The team collaborated with Glendale Community College (GCC) to produce an interactive product intended to supplement educational instructions regarding nutrition. The educational game developed, "Nutribots" features the player acting as a nutrition based nanobot sent to the small intestine to help the body. Throughout the game the player will be asked nutrition based questions to test their knowledge of proteins, carbohydrates, and lipids. If the player is unable to answer the question, they must use game mechanics to progress and receive the information as a reward. The level is completed as soon as the question is answered correctly. If the player answers the questions incorrectly twenty times within the entirety of the game, the team loses faith in the player, and the player must reset from title screen. This is to limit guessing and to make sure the player retains the information through repetition once it is demonstrated that they do not know the answers. The team was split into two different groups for the development of this game. The first part of the team developed models, animations, and textures using Autodesk Maya 2016 and Marvelous Designer. The second part of the team developed code and shaders, and implemented products from the first team using Unity and Visual Studio. Once a prototype of the game was developed, it was show-cased amongst peers to gain feedback. Upon receiving feedback, the team implemented the desired changes accordingly. Development for this project began on November 2015 and ended on April 2017. Special thanks to Laura Avila Department Chair and Jennifer Nolz from Glendale Community College Technology and Consumer Sciences, Food and Nutrition Department.
ContributorsNolz, Daisy (Co-author) / Martin, Austin (Co-author) / Quinio, Santiago (Co-author) / Armstrong, Jessica (Co-author) / Kobayashi, Yoshihiro (Thesis director) / Valderrama, Jamie (Committee member) / School of Arts, Media and Engineering (Contributor) / School of Film, Dance and Theatre (Contributor) / Department of English (Contributor) / Computer Science and Engineering Program (Contributor) / Computing and Informatics Program (Contributor) / Herberger Institute for Design and the Arts (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
In this undergraduate thesis, I explore the relationship between politics and popular culture through an ethnography of Justice League Arizona, a cosplay ensemble devoted to costumed civic activism. While existing scholarship addresses cosplay ensembles and political theory, there is very little that examines how the act of cosplay can be a form of politics and what the impact of that interpretation has on both individuals and the community at large. Through both participant observation and interviews with members of the ensemble, I discovered that cosplay has the ability to intensify aspects of the self, the ability to expose new aspects of the self, and the ability to bring one closer to a particular character. I also found cosplay to be political through the sensibility and situated knowledge that proves to be in practice during cosplay, ultimately having the power to be used as a form of political resistance.
ContributorsBurrus, Ella Rene (Author) / Mack, Robert (Thesis director) / Behl, Natasha (Committee member) / School of Social and Behavioral Sciences (Contributor) / Herberger Institute for Design and the Arts (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12