Matching Items (4)
Filtering by
- Creators: Minteer, Ben
Description
Amphibians have been experiencing a worldwide decline that is in part caused by an infectious disease, chytridiomycosis, specific to frogs and salamanders. Globally many species have declined or gone extinct because of the pathogenic fungus Batrachochytrium dendrobatidis, also known as the amphibian chytrid or Bd. By the time Bd was discovered it was too late to stop the spread and it has now been found on almost every continent. The trade of captive amphibians, used as pets, bait, and educational animals provides an opportunity to spread Bd. Because some amphibians can carry Bd without experiencing symptoms, it is possible for even healthy looking amphibians to spread the amphibian chytrid if they are moved from one location to another. Recently, a new species Batrachochytrium salamandrivorans (Bsal) was found on salamanders. Bsal was identified before it reached the United States, prompting concern regarding its spread and a call for regulation regarding the trade of captive amphibians. There are some regulations in place controlling the trade of amphibians, but they are insufficient to stop the spread of amphibian chytrid in captive populations. A 2016 law prohibits the importation of 201 salamander species. However, there is no central organization to sample or certify if amphibians are free from Bd or Bsal. Although some stores say they test for these pathogens the tests are unregulated and not reported to any central body. If the captive amphibian trade is to go disease free, there would need to be a significant push to coordinate testing efforts. To estimate Bd's prevalence in Arizona captive amphibian populations, I contacted pet stores, bait stores, and sanctuary or educational organizations to ask if I could sample their amphibian collections. My research built on the 2008 work of Angela Picco, who sampled for the amphibian chytrid in Arizona bait shops. I found that amphibian owners were often hesitant and unwilling to participate in this research opportunity. There are multiple reasons for this hesitancy including a fear of increased regulation, the potential for reporting to a government agency (USDA), or the eventual cessation of amphibian trade. The lack of willing participants suggests there may be difficulties in coordinating future sampling efforts for Bd and Bsal.
ContributorsFadlovich, Rachel Maurine (Author) / Collins, James (Thesis director) / Minteer, Ben (Committee member) / Brus, Evan (Committee member) / School of Life Sciences (Contributor) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Batrachochytrium dendrobatidis (Bd), the amphibian chytrid fungus causing chytridiomycosis, is the cause of massive amphibian die-offs. As with any host-pathogen relationship, it is paramount to understand the growth and reproduction of the pathogen that causes an infectious disease outbreak. The life-cycle of the pathogen, Bd, is strongly influenced by temperature; however, previous research has focused on Bd isolated from limited geographic ranges, and may not be representative of Bd on a global scale. My research examines the relationship between Bd and temperature on the global level to determine the actual thermal maximum of Bd. Six isolates of Bd, from three continents, were incubated at a temperature within the thermal range (21°C) and a temperature higher than the optimal thermal range (27°C). Temperature affected the growth and zoosporangium size of all six isolates of Bd. All six isolates had proliferative growth at 21°C, but at 27°C the amount and quality of growth varied per isolate. My results demonstrate that each Bd isolate has a different response to temperature, and the thermal maximum for growth varies with each isolate. Further understanding of the difference in isolate response to temperature can lead to a better understanding of Bd pathogen dynamics, as well as allow us the ability to identify susceptible hosts and environments before an outbreak.
ContributorsWoodland, Laura Elizabeth (Author) / Collins, James (Thesis director) / Davidson, Elizabeth (Committee member) / Roberson, Robert (Committee member) / School of Politics and Global Studies (Contributor) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
Description
In “The Trouble of Wilderness,” William Cronon (1995) states the concept of wilderness, historically, is based on the romanticized ideal of the “untamed” frontier that influenced the American expansion ideals in the late 1800s and early 1900s, including the initial conservation movement. This idea of wilderness is defined by “empty” lands that needed to be utilized by the civilized Anglo-Americans, or lands that needed to be preserved from human alterations. Wilderness was separate from humans and, therefore, was also thought to be land that had been unaltered by human touch. The disappearing frontier was being turned into farmlands and civilization, so the Anglo-Americans, the ones who culturally viewed undeveloped land as a place for recreation, wished to save the ‘wilderness’ that was not yet being used. But as will be discussed it was in fact being used just not by the Anglo-Americans. This wilderness that they were trying to preserve became the national parks, such as Yellowstone and Yosemite. Under this rationale, Indigenous peoples were forced off the land to create the illusion of these places fitting this romanticized idea of wilderness. This essay examines the national parks in context of this concept of wilderness being free from humans and how national parks rationalized the removal of Indigenous people from these “wild” lands by using this concept of wilderness. Specifically, it uses the history of Yellowstone and Yosemite parks, which are some of the first parks to enter the National Park System, as sites of understanding how the idea wilderness was conceptualized by the American government during the late 1800s as places that are separate from humans. This essay argues that these ideals are based on racist and xenophobic approaches that the early United States government used in regards to relationships with Indigenous people. To discuss these ideas, this paper will examine the language used in early government documents regarding the policies of the national parks along with art and writings from this time period to show how the public and government viewed these national parks and the Indigenous people in the surrounding areas. Particularly, this paper will consider the original documents that established the national parks and the language that was used in these documents. It will then compare these policies from the origins of the national parks to the policies in place now regarding Indigenous people, such as the reparations that are trying to be made in these areas.
ContributorsSease, Emma Lynne (Author) / Richter, Jennifer (Thesis director) / Minteer, Ben (Committee member) / School of Life Sciences (Contributor) / School of International Letters and Cultures (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
Description
The national parks are often considered to be one of America’s greatest achievements. Through a rich and sometimes tumultuous history, the national parks have been shaped from unwanted swaths of land into some of the most famous landscapes in the country. There are ultimately two conflicting goals of the national parks: provide enjoyment for the American people and protect the land. In recent years, increased popularity of the parks has made achieving these dual goals particularly difficult. Crowding in the parks leads to both ecological and social problems that threaten both goals of the national parks. Crowding is a multifaceted issue that must be explored from multiple perspectives.
Using Zion as a case study, the problems of crowding are explored and evaluated. First the history of the national parks is described to determine how the parks were created and popularized. After exploring the history of the parks, crowding in the national parks will be
discussed, including an overview of some of the significant social science literature exploring
crowding and its impact on visitor experience. This analysis will conclude with an examination
of visitor management strategies and an examination of the park-specific literature about the specific problems and decisions confronting managers at Zion National Park. A personal account of a visit to Zion during the peak season will provide a personal narrative about the meaning and purpose of the park experience.
The final section of this thesis will consider a range of opposing views on the philosophy of national parks and the park experience, centering around the ideas of Abbey, to address the deeper questions surrounding the goals of park management as we likely more toward an even more crowded park future. Ultimately the paper concludes that the parks has shifted irrevocably away from the ideals of Abbey, although his voice still provides inspiration to generations of park lovers. Additionally, while hard limits must eventually be set, in an era of increasing human influence, the park experience will need to be redefined to be more expansive and inclusive of all who wish to visit and enjoy.
Using Zion as a case study, the problems of crowding are explored and evaluated. First the history of the national parks is described to determine how the parks were created and popularized. After exploring the history of the parks, crowding in the national parks will be
discussed, including an overview of some of the significant social science literature exploring
crowding and its impact on visitor experience. This analysis will conclude with an examination
of visitor management strategies and an examination of the park-specific literature about the specific problems and decisions confronting managers at Zion National Park. A personal account of a visit to Zion during the peak season will provide a personal narrative about the meaning and purpose of the park experience.
The final section of this thesis will consider a range of opposing views on the philosophy of national parks and the park experience, centering around the ideas of Abbey, to address the deeper questions surrounding the goals of park management as we likely more toward an even more crowded park future. Ultimately the paper concludes that the parks has shifted irrevocably away from the ideals of Abbey, although his voice still provides inspiration to generations of park lovers. Additionally, while hard limits must eventually be set, in an era of increasing human influence, the park experience will need to be redefined to be more expansive and inclusive of all who wish to visit and enjoy.
ContributorsKevershan, Kimberly Robin (Author) / Minteer, Ben (Thesis director) / Budruk, Megha (Committee member) / Govani, Michelle Sullivan (Committee member) / School of Molecular Sciences (Contributor) / Environmental and Resource Management (Contributor) / Division of Teacher Preparation (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05