Digital Commons Network^™

An Ecological Assessment Of An Endangered Lichen From Central California: Sulcaria Isidiifera, The Splitting Yarn Lichen, Elijah C. Balderas

Master's Theses

Lichens are an underrepresented group of organisms when it comes to both research and conservation efforts. At the same time, lichens face increasing threats from anthropogenic sources including wildfires, climate change and urbanization. With this thesis, I seek to ascertain and publish ecological data on a critically endangered lichen to inform future conservation designations and efforts to preserve and protect the species in perpetuity.

In Chapter 1, I provide an ecological overview of the known range of Sulcaria isidiifera and assess the status of Sulcaria isidiifera via a population count. Sulcaria isidiifera occurs in maritime chaparral habitat in the Los …

Genetic Population Structure And Effective Number Of Breeders In Systems Across The Range Of The Gulf Sturgeon, Jacob Zona

Master's Theses

Gulf sturgeon (Acipenser oxyicnhus desotoi) are a large, anadromous fish belonging to an ancient lineage that diverged as early as 400 MYA. Overfishing for meat and caviar during the early 1900’s reduced their range and abundance and continued habitat destruction and mortality have limited their ability to recover, leading to their listing under the Endangered Species Act. This study uses genetic techniques to determine the effective number of breeders for multiple spawning groups of Gulf sturgeon in river systems across their range to set a baseline for tracking reproductive success of the species. Accompanying genetic information relevant to …

Relationship Between Bats And Prairie-Dog (Cynomys Ludovicianus) Colonies In Western Kansas, Mario N. Rodriguez

Master's Theses

Although it is known that prairie dog colonies can increase biodiversity in the areas surrounding them, there is extraordinarily little known about the relationship between bats and black-tailed prairie dogs (Cynomys ludovicianus). In a recent study from the Front Range of Colorado, several bat species were found to be consistently flying around prairie dog colonies, presumably foraging due to increased insect diversity and abundance. Despite the importance of prairie dogs to the ecosystem, prairie dog colonies are usually eradicated due to the perception that they adversely impact cattle grazing. If insectivorous bats are attracted to prairie dog colonies …

Conservation Genomics: Utilizing Genetic And Transcriptomic Sequencing For Effective Conservation Management Of Astragalus Osterhoutii, Christine Mowad

Master's Theses

Astragalus osterhoutii M.E. Jones (Fabaceae) is a federally listed, rare, endemic species restricted to seleniferous soils in Grand County, CO (Anderson, 1989). This research utilized both RADseq and RNAseq to generate neutral and adaptive genomic datasets. Neutral data analysis aimed to determine i) the genetic diversity of A. osterhoutii and each of its populations level, ii) how genetic structure is partitioned across the species range, and iii) the closest relative to A. osterhoutii. Analysis of adaptive, RNAseq data aimed to identify i) differentially expressed genes, ii) if patterns of expression are similar to neutral data, and iii) differences in Se …

Understanding Species Boundaries Between Penstemon Acaulis And Penstemon Yampaensis: Implications For Conservation And Management, Juliet Simpson

Master's Theses

Effective conservation management relies upon accurate taxonomic information and an understanding of the genetic health and population structure for each species. Penstemon acaulis and P. yampaensis are endemic species to Colorado, Utah, and Wyoming, and have been considered for listing under the Endangered Species Act (ESA). There is little biological data published about either and there remains taxonomic uncertainty surrounding the two. Phylogenetic analyses showed P. acaulis and P. yampaensis to be distinct, monophyletic lineages and morphological data further supported taxonomic recognition of both species, however these results did not support the previous species boundaries. Eastern populations of P. acaulis …

Development And Use Of An Environmental Dna Tool To Monitor Recovery Of The Critically Endangered Smalltooth Sawfish, Pristis Pectinata, In The Northwest Atlantic, Ryan N. Lehman

Master's Theses

The Critically Endangered Smalltooth Sawfish, Pristis pectinata, was once common in the tropical and subtropical waters of the Atlantic Ocean; however, following global declines in range and abundance over the past century, individuals were restricted to the waters of south and southwest Florida (SWFL) by about the 1980’s. Recently, public encounter reports have emerged in historically occupied habitats in United States waters, suggesting individuals are present in, or re-occupying, these areas, although the status of P. pectinata outside of SWFL is not currently well understood. Targeted environmental DNA (eDNA) surveys were chosen to assess the occurrence of P …

Behavioral Ecology And Physiological Health Of Managed Populations Of Juvenile Blanding's Turtles (Emydoidea Blandingii) In Urban Wetlands, Armand Andre' Cann

Master's Theses

Substantial threats to reptile species biodiversity have become apparent in the last few decades. This is partly caused by significant losses in grasslands and their associate prairie-wetland ecosystems. One Midwestern prairie-wetland species, Blanding's Turtles (Emydoidea blandingii), are at risk of extirpation due to habitat loss, fragmentation, and increased predator populations. Consequently, significant head-starting efforts, a form of reintroduction conservation using captive-reared and then released turtles, have been conducted to recover populations of E. blandingii in northeastern Illinois. However, the success of these programs both locally and range-wide have not been fully quantified. Unfortunately, many approaches to guaging success involve long-term …

Extended Producer Responsibility And The Environmental Policy Implementation Process In California: A Case Study Of Paintcare, Justin Ian Weiss

Master's Theses

Due to increasing volumes of certain types of waste and the cost of municipal waste management, California and local jurisdictions are pursuing legislation to engage manufacturers in the collection and disposal of the products they manufacture. These legislative frameworks take many forms, but many employ the “producer pays” principle commonly referred to as “extended producer responsibility” (EPR). These policies, which are more common in the European Union, are often contentious and difficult for U.S. governments to pursue, as targeted and influential industries resist policy implementation. The objective of this thesis was to better understand the reasons for the successful implementation …

Do Climate Shocks Affect Smallholder Farmers’ Conservation Practices? Evidence From Peru, Heleene Tambet

Master's Theses

Peruvian agriculture is estimated to be subject to the greatest impacts of climate change in South America. Resulting shifts in rainfall patterns and extreme temperature realizations impose more frequent abnormal weather shocks on farmers and their production decisions. I study the impact of such shocks on agricultural practice choices of farmers growing two main staples, maize and potato; namely, I analyze adoption of practices reducing soil degradation, practices aimed towards water conservation, and application of inorganic fertilizer. I utilize unique cross-sectional data from Peru National Agricultural Survey over the years 2014 to 2016 in conjunction with long-term climate data, and …

Critical Habitat Assessment And Recovery Plan For The Kansas State Threatened Broad-Headed Skink, Allison Hullinger

Master's Theses

No abstract provided.

Gendered Impacts Of Community-Based Conservation Initiatives In Kimana/Tikondo Group Ranch Outside Of Amboseli National Park, Megan Clemens

Master's Theses

Community-based conservation has become a common solution to addressing local communities needs and concerns when it comes to conservation initiatives associated with, or outside the boundaries of national parks. Community-based initiatives associated with Amboseli National Park in southern Kenya mark one of the first attempts to include local communities in conservation initiatives and management as well as establish systems of benefit sharing between conservation and local communities. However, a critique of community-based conservation initiatives points out they often assume community homogeneity. Assumption of community homogeneity leads to inequities in benefits sharing, exclusion of subgroups (women, ethnic minorities) or even exacerbate …

The Population Genetics Of Morro Bay Eelgrass (Zostera Marina), Julia Gardner Harencar

Master's Theses

Seagrass populations are in decline worldwide. Zostera marina (eelgrass), one of California’s native seagrasses, is no exception to this trend. In the last 8 years, Morro Bay, California has lost 95% of its eelgrass. Eelgrass is an ecosystem engineer, providing important ecosystem services such as sediment stabilization, nutrient cycling, and nursery habitats for fish. The failure of recent restoration efforts necessitates a better understanding of the causes of eelgrass decline in this estuary. Previous research on eelgrass in California has demonstrated a link between population genetic diversity and eelgrass bed health, ecosystem functioning, and resilience to disturbance and extreme climatic …

Trail Vision: Utilizing Leopold As Environmental Equipment For Living, Kendall Elizabeth Barrett

Master's Theses

Hiking trails are one of the major ways citizens make observations about the natural world. An analysis of trail maintenance texts demonstrates a focus on concealment and camouflage of human construction and upkeep in National Scenic Trails. These practices are detrimental to environmentalism, since the resulting ideology frames nature as overly self-sufficient and not in need of human stewardship. Trail maintenance practices are analyzed in reference to the nature/culture dichotomy. Perceptions of nature’s self-healing ability are analyzed through a comparison of the oil spills in Santa Barbara during 1969 and 2015. An alternative approach is found through Aldo Leopold. Leopold …

Effects Of Experimental Noise Exposure On Songbird Nesting Behaviors And Nest Success, Tracy I. Mulholland

Master's Theses

Anthropogenic noise is an increasingly prevalent global disturbance. Animals that rely on the acoustical environment, such as songbirds, are especially vulnerable to these sounds. Traffic noise, in particular, overlaps with the frequency range of songbirds, creating masking effects. We investigated the effects of chronic traffic noise on provisioning behaviors and breeding success of nesting western bluebirds (Sialia mexicana) and ash-throated flycatchers (Myiarchus cinerascens). Because anthropogenic noise exposure has the potential to interrupt parent-offspring communication and alter vigilance behaviors, we predicted that traffic noise would lead to changes in provisioning behaviors, such as fewer visits to the …

The Preservation And Protection Of Native Biodiversity In The Guadalupe Nipomo Dunes Complex, Lindsey M. Whitaker, Matthew Ritter, Scott J. Steinmaus, Jonathan Hall

Master's Theses

The Guadalupe Nipomo Dunes Complex (GNDC) is located within the California Floristic Province, a biodiversity hotspot characterized by high rates of endemism and exceptional loss of habitat. In 1980, the US Fish and Wildlife Service described the GNDC as, “the most unique and fragile ecosystem in the State of California,” and ranked it first on a list of 49 habitat areas needing state protection. It is the largest coastal dune area in California and it is one of the last remaining, relatively intact ecosystems of its type and size in the western United States. The growing recognition of species decline …

Effects Of Environmental And Anthropogenic Factors On The Range Contraction Of Bird And Mammal Species, Patrice M. Betz

Master's Theses

The largest contributor to biodiversity loss is habitat destruction caused by humans. A common consequence of habitat destruction is a reduction in the geographic range of a species. Little research has been done to separate the contribution of anthropogenic and environmental variables to the extinction or persistence of species that have experienced range contraction. In this thesis, I examined the relative effects of several variables (elevation, mean annual precipitation, mean annual temperature, human population density, distance from roads, and proportion of land converted to built-up land, cropland, and rangeland) on the geographic ranges of declining bird and mammal species from …

Conservation Of Bridle Shiner (Notropis Bifrenatus) In Connecticut: Issues In Detecting An Elusive Species, Kasey C. Pregler

Master's Theses

Bridle Shiner (Notropis bifrenatus) is apparently declining over most of its range and is currently listed as a species of concern in Connecticut. Using an occupancy modeling framework in program PRESENCE, my study compared seining and electrofishing backpack unit detection probabilities of Bridle Shiner. This research indicated the apparent decline of Bridle Shiner in the state was in part due to changes in sampling gear used for statewide surveys. Seining used 50 years ago was demonstrably more effective at capturing Bridle Shiner than the currently favored and more frequently used electrofishing gear. In light of this recent finding, …

Wmost Case Study For Uconn’S Storrs Campus To Optimize Water Purchases From Connecticut Water Company, Joseph D. Albani

Master's Theses

The University of Connecticut currently provides potable water to its Storrs campus and Mansfield from groundwater pumps in the Willimantic and Fenton River Wellfields capable of producing 1.48 MGD and 0.8442 MGD, respectively. In 2005, sections of the Fenton River ran dry as a result of low flows and overuse. Since that time, the University has undertaken successful efforts to understand and manage its water resources. The wellfields’ supply is currently inadequate for the 15% margin of safety for peak monthly demands. Additionally, UConn is planning expansions bringing 6,500 more students to campus, with the facilities to accommodate them. UConn …

Inferring Herpetofaunal Distributions And Habitat Preferences For Conservation Planning, Lisa M. Prowant

Master's Theses

Global climate change is a serious threat to global biodiversity (IPCC, 2001). Due to their limited dispersal ability, reptiles and amphibians might be more vulnerable to rapid climate change than are other taxonomic groups (Gibbons et al., 2000). Herpetofauna in south-central Kansas was sampled from May through August in 2012 and 2013. Seven study sites spanning Meade, Clark, Comanche, and Barber counties were sampled. Drift fence and cover-board traps were arranged in transects at each site to capture reptiles and amphibians. Species were also sampled through surveys on all-terrain vehicles and on foot. Two thousand nine hundred and forty five …

Ecotourism As A Tool For Conservation Of Coast Redwoods In Santa Cruz County, California, Chandana Rao

Master's Theses

According to the World Tourism Organization, ecotourism is the fastest growing segment of the tourism industry, generating $300 billion in annual revenue. Ecotourism aims to control the damaging effects of conventional mass tourism and tries to overcome tourism's environmental and socio-cultural challenges. In an ideal situation, ecotourism can help conserve fragile biodiversity, build ties between parks and communities, and increase awareness of environmental issues; it also includes a profit impetus for businesses.

This research was conducted to evaluate the potential for developing ecotourism as a conservation tool in the four redwoods state parks of Santa Cruz County. The study assessed …

Western Burrowing Owl Predation In An Urban Setting In California: Do California Ground Squirrel Calls Reduce Risk?, Lisa Anne Henderson

Master's Theses

Western burrowing owls are found in ground squirrel burrows throughout the urbanized landscape of the South San Francisco bay area, where they are threatened by habitat loss and degradation, prey limitation and predation. Previous research has characterized effects of habitat loss and prey-base limitations on owls, but the interplay between ground squirrels, owls and their predators has not yet been studied. The objective of this study was to assess the rate and types of predation interactions faced by Western burrowing owls and the extent to which California ground squirrels help burrowing owls reduce risk through alarm calling at Moffett Federal …

A Study Of Genetic Variability In Larval And Adult Populations Of Dungeness Crab (Cancer Magister), Cairbre Fanslow

Master's Theses

Spatial and temporal genetic variation was assessed using mitochondrial DNA from adult and megalopae of Dungeness crabs, Cancer magister, from Fraser Delta in British Columbia, Washington, Oregon, and California. Megalopae were continuously sampled using light traps in one location, Coos Bay, Oregon, and compared with adults sampled across the species' range. While small-scale spatial and temporal variation were evident, there was no significant fit to the Isolation-by-Distance model when considering adult and larvae populations sampled over a coastal length of ~1700 km (Mantel r = 0.059, p = 0.289). Smaller bays showed higher genetic diversity than larger bays, contrary to …

Forest Regeneration On The Osa Peninsula, Costa Rica, Manette E. Sandor

Master's Theses

Woody species diversity of secondary forest has the potential to converge with that found in old growth forest. This study is the first to examine multiple aspects of species and reproductive trait diversity, and their relationship to each other, across a successional chronosequence. Species richness and species diversity increases with increasing age of forest. Diaspore size and diversity as well as fruit size generally increased with increasing age of forest, but fruit size diversity did not. Abundance of animal-dispersed species increased whereas wind-dispersed species decreased in abundance over succession. Insect-pollinated individuals were most abundant overall. Diaspore diversity, pollination diversity, and …

Spatial Conservation Prioritization Of Kansas For Terrestrial Vertebrates, Megan R. Rohweder

Master's Theses

Biological diversity is being threatened by the encroachment of humans, which limits the habitat available for conservation and strains resources allocated for conservation efforts. However conservation goals have to be achieved within these limitations. Conservation priorities can ensure that habitat and resources are used effectively and efficiently. I developed a conservation prioritization plan for the terrestrial vertebrates of Kansas. I used modeled distributions of every terrestrial vertebrate species found in Kansas to build three biodiversity indices; species richness, vulnerability, and endemicity. Kansas was divided into a grid of planning units, 34.5 km2. For each taxonomic group the planning units were …

The Biology And Ecology Of Six Rare Plants From Plumas National Forest, Northern California, Usa, Suzie Woolhouse

Master's Theses

The majority of our knowledge about the natural world has come from the study and observation of common species, yet a significant portion of species in the world are rare. In this study, biological and ecological data was collected for six rare taxa from Plumas National Forest. The taxa were Monardella stebbinsii, Monardella follettii (Lamiaceae), Lewisia cantelovii (Montiaceae), Cypripedium californicum, Cypripedium fasciculatum (Orchidaceae) and Clarkia mildrediae subsp. mildrediae (Onagraceae). The two Monardella's and Cypripedium californicum are serpentine endemics, and the Lewisia is found growing both on and off serpentine. Five sites were visited per species, and soil samples …

Residential Water Conservation: A Cross Comparative Analysis, Jeffrey M. Cook

Master's Theses

This thesis will explore different water conservation strategies and systems in the residential home, using the city of Irvine as a basis. The thesis will compare the financial implications between the different systems and as a return on investment. The analysis will also account for ecological and social implications on the occupants, in particular their standard of living and lifestyle changes. The thesis will explore the ability to conserve water in new residential construction and will provide a sustainable and conscientious schematic water design for the particular area of concern.

This thesis will act as a preliminary case study for …

Reducing Disturbances To Marine Mammals By Kayakers In The Monterey Bay, Megan Maye Gunvalson

Master's Theses

Team OCEAN is a kayaker-outreach program located in Monterey Bay National Marine Sanctuary under the direction of the National Oceanic and Atmospheric Administration, whose goal is to reduce disturbances to marine mammals by kayakers. This study documented the interactions between kayakers and resting harbor seals (Phoca vitulina) and southern sea otters (Enhydra lutris nereis) at Team OCEAN's two outreach sites, Cannery Row and Elkhorn Slough, to determine if outreach was effective in reducing disturbances to harbor seals and sea otters.

No difference was observed in the percentage of kayaks causing disturbances to resting harbor seals when comparing days Team OCEAN …

Nested Subsets, Scale, And The Distribution Of Abundance: A Macroecological Approach, Elita Baldridge

Master's Theses

While the canonical nested subset pattern suggests that less species-rich areas will contain a proper subset of the species observed in richer areas, actual data sets do not show perfect nestedness; however, they show a pattern with more structure than would be expected by chance. Biological processes like immigration and extinction have traditionally been thought to produce the nested subset pattern. These processes acting indirectly could cause variation in the distribution and abundance of species that could produce nestedness at a variety of scales. Determining at what scales the pattern is observed might allow inference of processes that are more …

Studies Of Increment, Height-Weight, And Moisture Content Of Important Western Kansas Grasses., John Launchbaugh

Master's Theses

A logical approach to the question of how much forage is taken by livestock would be, it seems, to study first the growth habits of the important species of p:i.sture and range grasses in the areas where they are used. The purpose of this report, therefore, was to stud y the development of several species of perennial grasses in the mixed prairie of west-central Kamas from near the beginning of the grazing season until the grasses had reached maturity.

The Ecology Of A Pasture In The Dakota Sandstone Formation In Ellsworth County, Kansas, Byron O. Blair

Master's Theses

The vast area of prairie of the United States has long been known as the "feeding grounds" for herbivorous animals. In the past, the standard of living of the people of grassland regions has been measured largely by the ability of the native ranges to produce ·vegetation sufficient to maintain economical livestock production. It has become apparent that if our desired living standard is to be maintained, we must direct our efforts toward a program by the most rapid and efficient means possible, which will bring economic stability to the seventeen million acres of grassland in the Great Plains region. …