Digital Commons Network^™

Population And Trophic Dynamics Of Striped Bass And Blueback Herring In The Connecticut River, Justin P. Davis

Doctoral Dissertations

Case studies of the ramifications of predator management for prey population dynamics can play a valuable role in developing ecosystem fisheries management. My dissertation focuses on the predator-prey interaction between Striped Bass (Morone saxatilis), an abundant predatory finfish, and an imperiled prey population of anadromous Blueback Herring (Alosa aestivalis). Annual returns of Blueback Herring to the Holyoke Dam on the Connecticut River in southern New England collapsed during the 1980-2000s, coincident with Striped Bass recovery. I studied the abundance and demography of both species in the Connecticut River during 2005-08, measured predation levels, and surveyed the …

Everyday Ecologies In The Writings Of Georgia Authors Tina Mcelroy Ansa, Melissa Fay Greene, Mary Hood, And Janisse Ray, Rachel G. Wall

English Dissertations

Four Georgia women authors focus on different but equally important components of life: the natural environment of Janisse Ray, relationships in Mary Hood, culture in Tina McElroy Ansa, and sociological history in Melissa Fay Greene. While the focus of the writings by these authors overlap, their various approaches examined together reveal the essential areas where contemporary society has lost its way. All four argue how not to live by pointing out examples of negative actions and the consequences of human carelessness. Through compelling stories, these four authors show us how to preserve and improve our environment, our relationships, our culture, …

Sleep As An Evolved Behavior: Ecological Opportunity Costs And Sleep Optimization, Gandhi Yetish

Anthropology ETDs

Sleep problems afflict millions world-over. Treating this has been difficult because there is no consensus definition for “normal” sleep. People can vary in their personal sleep need, but the determinants of variation in sleep duration are largely unknown, as is the criteria to determine how much variation is normal. Given that most diurnal mammals (including primates) appear to sleep from sunset to sunrise, the leading explanation for sleep pathology in the post-industrial world has been that electronics, especially light illuminating devices, substantially reduce sleep duration. This assertion has heretofore only been tested experimentally. This research aims to resolve this issue …

Hybrid Taguchi-Objective Function Optimization Approach For Automatic Cave Bird Detection From Terrestrial Laser Scanning Intensity Image, Mohammed O. Idrees, Biswajeet Pradhan

International Journal of Speleology

This paper proposes an optimized Taguchi-objective function segmentation-based image analysis to detect bird nests in a cave from high resolution terrestrial laser scanning intensity images. First, the Taguchi orthogonal array was used to design 25 experiments with three segmentation parameters: scale, shape, and compactness, each having five variable factor levels. Then, a plateau objective function was computed for each experiment using their respective level combinations. A merger of the factor level combination in the orthogonal array and the computed plateau objective function values was used to generate main effects and interaction plots for signal-to-noise ratios, which provided a measure of …

Becoming Sonic: Ambient Poetics And The Ecology Of Listening In Four Militant Sound Investigations, David C. Jackson

Electronic Thesis and Dissertation Repository

This dissertation Becoming Sonic: Ambient Poetics and the Ecology of the Ear in Four Militant Sound Investigations offers a critical and historical analysis of acoustic ecology and soundscape recording —the sounds, noises, and silences that make up our ambient sonic environment and are found and recorded “in the field” by artists to create recordings and performances are then experienced by listeners. Field recording captures the diverse and often unwanted or inconsequential sounds of a space, which can then be used to bring attention to the often unheard and unconscious processes that stratify space. By stratification I am referring to the …

Population Characteristics Of Human-Commensal Rodents Present In Households From Mérida, Yucatán, México, Jesús Alonso Panti-May, Silvia F. Hernández-Betancourt, Marco A. Torres-Castro, Carlos Machaín-Williams, Nohemi Cigarroa-Toledo, Lorenzo Sodá, Gabriela López-Manzanero, Josué R. Meza-Sulú, Victor M. Vidal-Martínez

MANTER: Journal of Parasite Biodiversity

Anthropocommensal rodents live in close proximity to humans in many habitats around the world. They are a threat to public health because of the pathogens they carry. Recent studies in Mérida, Yucatán, México, have shown that commensal rodents harbor potential zoonotic pathogens such as bacteria, helminths, and viruses. In this study, we describe reproductive and demographic parameters of house mice and black rats present in households from Mérida, Yucatán, México, a municipality located in a tropical region in southern México. Rodents were trapped in 142 households within the municipality of Mérida from 2011 to 2014. A total of 832 rodents …

An Inquiry Into The Pedagogical Implications Of Dewey’S Ecological Thinking, Simon Jorgenson

Occasional Paper Series

My primary purpose is to (re)examine Dewey in the context of contemporary conceptions of ecology and environmental education. With this in mind, I will focus primarily on what Dewey has to say about the natural world, beginning with his general philosophy and moving through several of his educational works.

Microhabitat Use Affects Brain Size And Structure In Intertidal Gobies, Gemma E. White, Culum Brown

Culum Brown, PhD

The ecological cognition hypothesis poses that the brains and behaviours of individuals are largely shaped by the environments in which they live and the associated challenges they must overcome during their lives. Here we examine the effect of environmental complexity on relative brain size in 4 species of intertidal gobies from differing habitats. Two species were rock pool specialists that lived on spatially complex rocky shores, while the remainder lived on dynamic, but structurally simple, sandy shores. We found that rock pool-dwelling species had relatively larger brains and telencephalons in particular, while sand-dwelling species had a larger optic tectum and …

Individual Variation In Plant Traits Drives Species Interactions, Ecosystem Functioning, And Responses To Global Change, Quentin Daniel Read

Doctoral Dissertations

Ecologists have long sought to understand the processes that lead to the riotous diversity in communities of organisms that inhabit disparate climates and landscapes. Such a diversity of traits leads to a diversity of interactions among species in natural communities, which in turn generates a diversity of potential responses to ongoing global change. In this dissertation, I do three things: I explore the forces that structure plant communities and the ecosystem functions that they mediate, I describe patterns of variation among communities, species, and individual organisms across environmental contexts, and I disentangle the direct effects of global change from the …

The Planet, 2016, Spring, Jesse Nichols, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Chemical Investigation Of Antarctic Marine Organisms & Their Role In Modern Drug Discovery, Jacqueline Lee Fries

USF Tampa Graduate Theses and Dissertations

The chemicals produced by biological systems, whether proteins, peptides, or terpenes, will always provide an intriguing topic for researchers. Invisibly controlling every aspect of nature, these molecules are responsible for life, evolution, and death. Specifically, here is described the secondary metabolites produced by Antarctic marine organisms as well as others, and how they are used to defend or attract other animals while potentially providing health benefits to mankind. This is done through collection, extraction, and separation of individual specimens. The respective mixtures of compounds after isolation are then analyzed via spectroscopic methods such as nuclear magnetic resonance spectroscopy, mass spectrometry, …

3d Tool Evaluation And Workflow For An Ecological Approach To Visualizing Ancient Socio-Environmental Landscapes: A Case Study From Copan, Honduras, Heather Richards-Rissetto, Shona Sanford-Long, Jack Kerby-Miller

Department of Anthropology: Faculty Publications

Architectural reconstructions are the centerpieces of ancient landscape visualization. When present, vegetation is relegated to the background, resulting in underutilized plant data—an integral data source for archaeological interpretation—thus limiting the capacity to take advantage of 3D visualization for studying ancient socio-environmental dynamics. Our long-term objective is to develop methods of 3D landscape visualization that have value for examining changes in land use and settlement patterns. To begin to work toward this objective, we have (1) identified 3D tools and techniques for vegetation modeling and landscape visualization, (2) evaluated the pros and cons of these tools, (3) investigated biological and ecological …

Channeled Whelk (Busycotypus Canaliculatus) Ecology In Relation To The Fishery In Vineyard And Nantucket Sounds, Massachusetts, Shelley Ann Edmundson

Doctoral Dissertations

Channeled whelks (Busycotypus canaliculatus) are predatory marine gastropods that support lucrative commercial fisheries along the east coast of the United States, with areas around Massachusetts supplying the largest landings. In the absence of a more thorough and comprehensive understanding of channeled whelk biology, it is unclear how to sustainably manage their fisheries. Within this dissertation, various aspects of whelk ecology were investigated to determine how to protect this species, while effectively managing the local fishery.

Early life history experiments revealed channeled whelk egg strings may incubate for 8 to 9 months in MA water temperatures. Incubation period decreased with increasing …

Ecological Laws And Their Promise Of Explanations, Viorel Pâslaru

Philosophy Faculty Publications

Marcel Weber (1999) argued that the principle of competitive exclusion is a law of ecology that could explain phenomena (1) by direct application, or (2) by describing default states. Since he did not offer an account of explanation by direct application of laws, I offer an interpretation of explanation by direct application of laws based on a proposal by Elgin and Sober (2002). I show that in both cases it is the descriptions of mechanisms that explain phenomena, and not the laws. Lev Ginzburg and Mark Colyvan (2004) argued Malthus’ Law of Exponential Growth is the first law of ecology, …

An Examination Of Plant Community Composition In Six Carolina Bays On The Coastal Plain Of South Carolina, Katherine L. Altman-Goff

Electronic Theses and Dissertations

Historically high rates of human impact and recent Supreme Court cases, which have affected the regulation of geographically isolated wetlands in the United States, suggest that Carolina bays may be at high risk of human impacts in the future. Conservation efforts should be established based on applied ecological data and, if regulations by state and federal agencies are unable to conserve Carolina bay wetlands, it may be important to prioritize individual bays for preservation on protected lands. I examined plant community composition, diversity, richness, and rarity and soil parameters in six Carolina bays across South Carolina, using a replicated ecological …

Bibliographia Phytosociologica Et Floristica Mongolia: Pars Iv, Werner Hilbig

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

In Ergänzung zu den bisherigen drei Teilen der Bibliographie vegetationskundlicher, vegetationsökologischer, floristischer und pflanzengeographischer Arbeiten über die Mongolei wird in dieser Arbeit Teil IV der Bibliographie vorgelegt. Er umfasst im Wesentlichen den Zeitraum 2007 bis 2014. Auch Publikationen zur Vegetationsgeschichte und zum botanischen Naturschutz werden berücksichtigt.

English summary:

In addition to the hitherto existing three parts of the bibliography of geobotanical, ecological, floristic and plant-geographical papers on Mongolia the part IV of the bibliography is given. It comprises in the main point the period from 2007 until 2014. In addition, publications on vegetation history and botanical nature protection are considered.

Seasonal Habitat Selection Of The North American Porcupine (Erethizon Dorsatum) In A Coastal Dune Forest, Cara L. Appel

Cal Poly Humboldt theses and projects

Wildlife-habitat relationship studies are important for understanding the factors that determine where species occur in space and time. Habitat selection by generalist species should be studied on fine spatial and temporal scales to avoid masking important differences between seasons, localities, or orders of selection. I conducted the first study of habitat use and general ecology of North American porcupines (Erethizon dorsatum) in a coastal dune environment. Specifically, I assessed changes in body mass, home range size, and habitat selection in relation to the potential for seasonal nutritional and survival bottlenecks as reported elsewhere. Although they are considered generalists, …

A Comparison Of Macrofaunal And Algal Communities In Oyster Aquaculture Gear, An Eelgrass Bed, Oyster Reef, And A Mudflat In Great Bay, New Hampshire, Megan Elizabeth Glenn

Master's Theses and Capstones

Oysters (Crassostrea virginica) and eelgrass (Zostera marina) are important ecosystem engineers in Great Bay, NH, however despite restoration efforts they have been in decline. In addition to loss of the resource, this degradation results in loss of associated ecosystem services such as habitat provision. It is possible that the recent increase in oyster farming in Great Bay could help mitigate habitat loss. My research objective was to quantify the biotic communities present in three natural habitats (eelgrass beds, oyster reefs and mudflats) in Great Bay NH and compare those to communities living on the type of gear (“racks and bags”) …