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Theses/Dissertations

California Polytechnic State University, San Luis Obispo

2015

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Articles 1 - 30 of 38

Full-Text Articles in Life Sciences

Gopher Intrusion In Cropping Systems, Kenneth Romero, Paul Cardinalli Dec 2015

Gopher Intrusion In Cropping Systems, Kenneth Romero, Paul Cardinalli

Agricultural Education and Communication

The purpose of this project was to determine if no till vs. till on gopher populations was more beneficial. Which is more efficient at controlling gophers and explain the damage they can cause and the diseases they can potentially vector. What are the different options of pest managements that have to be used when dealing with a gopher infestation in a tilled field vs. a no-tilled field.


Marketing Alaskan Seafood: Strategies With Brand Identification, Differentiation, And Promotions, Anna Jacobson Dec 2015

Marketing Alaskan Seafood: Strategies With Brand Identification, Differentiation, And Promotions, Anna Jacobson

Journalism

Everyday the globe experiences changes with food. New methods in growing and harvesting are becoming approved, while others are frowned upon. People care more about where their food comes from than ever before. This research is to explore how Alaska seafood can successfully market their products in an ever-changing world. As challenges present themselves in the industry, opportunities are there as well.

This study sets out to explore marketing strategies for promoting a seafood brand. Through exploring current literature and interviewing experts to obtain data, conclusions will be drawn and analyzed. These findings will help to understand the best practices ...


The Effects Of Foliar Nutrient Applications On Split, Yield, And Internal Fruit Quality Of 'Wonderful' Pomegranate (Punica Granatum L.), John Matthew Chater Dec 2015

The Effects Of Foliar Nutrient Applications On Split, Yield, And Internal Fruit Quality Of 'Wonderful' Pomegranate (Punica Granatum L.), John Matthew Chater

Master's Theses and Project Reports

Fruit split is the most important physiological disorder in pomegranate production, causing devastating crop losses worldwide. Foliar nutrient applications have been used experimentally to mitigate pomegranate fruit split but none have been conducted using the industry standard cultivar, Wonderful, and little is known about the effects of foliar nutrient applications on pomegranate. Additionally, investigations into putative health benefits of pomegranate fruit have increased interest in its production but limited evidence exists regarding effects of agricultural practices such as foliar fertilizer applications on internal fruit quality. ‘Wonderful’ pomegranate trees at 2 commercial orchards were treated with foliar applications of ZnSO4 ...


Digestibility Of Two Complete Pelleted Diets By The Horse (Equus Caballus) As A Model Animal For Nondomestic Hindgut Fermenters, Emily M. Schwartz Dec 2015

Digestibility Of Two Complete Pelleted Diets By The Horse (Equus Caballus) As A Model Animal For Nondomestic Hindgut Fermenters, Emily M. Schwartz

Master's Theses and Project Reports

Estimating nutrient and energy requirements of exotic animals is a necessary component of nutrition management in zoos and other wildlife facilities. In the absence of species-specific data, domestic animal models are often referenced. Herbivorous hindgut fermenters, such as horses, zebra, and rhinoceros, rely on microbial fermentation in the cecum and colon to utilize dietary structural carbohydrates. The study objective was to measure the digestible energy of two (LOW, HIGH) complete pelleted diets by the horse as a model for nondomestic hindgut fermenters. Seven, individually housed, adult Quarter Horse (Equus caballus) geldings were assigned to one of two diets as 100 ...


Predicting Invasive Range Of Eucalyptus Globulus In California, Anthony J. Lopez Dec 2015

Predicting Invasive Range Of Eucalyptus Globulus In California, Anthony J. Lopez

Master's Theses and Project Reports

Eucalyptus globulus is the subject of intense debate in California. Its invasive potential, aggressive growth, reproductive biology, and association with fire make the prediction of spread important in California. Two modeling simulations, Climex and Maxent, will illustrate the distribution and potential growth range of E. globulus in California based on climate and presence. Modeling the potential range of growth will predict invasive spread. The anticipated result is the continued spread of E. globulus in coastal regions with adequate moisture and suitable climate. Predicting the range of E. globulus in California dictates management strategy and is key for preventing further introduction ...


Production And Harvest Of Microalgae In Wastewater Raceways With Resource Recycling, Alexander Colin Roberts Dec 2015

Production And Harvest Of Microalgae In Wastewater Raceways With Resource Recycling, Alexander Colin Roberts

Master's Theses and Project Reports

Microalgae can be grown on municipal wastewater media to both treat the wastewater and produce feedstock for algae biofuel production. However the reliability of treatment must be demonstrated, as well as high areal algae productivity on recycled wastewater media and efficient sedimentation harvesting. This processes was studied at pilot scale in the present research.

A pilot facility was operated with nine CO2-supplemented raceway ponds, each with a 33-m2 surface area and a 0.3-m depth, continuously from March 6, 2013 through September 24, 2014. The ponds were operated as three sets of triplicates with two sets continuously ...


Native Deer Mice (Peromyscus Maniculatus) Use Of Invasive Grass Seed (Ehrharta Calycina) In Coastal California, Megan Wong Dec 2015

Native Deer Mice (Peromyscus Maniculatus) Use Of Invasive Grass Seed (Ehrharta Calycina) In Coastal California, Megan Wong

Biological Sciences

No abstract provided.


Lyme Disease Ecology In San Luis Obispo County: The Role Of The Western Gray Squirrel, Ryan William Baker-Branstetter Nov 2015

Lyme Disease Ecology In San Luis Obispo County: The Role Of The Western Gray Squirrel, Ryan William Baker-Branstetter

Master's Theses and Project Reports

Despite the fact that eight cases of Lyme disease were diagnosed in San Luis Obispo County between 2005-2013, the identity of wildlife hosts serving as sources for tick infection in this region remained unidentified. The primary cause of Lyme disease in the U.S. is the spirochetal bacterium Borrelia burgdorferi sensu stricto, and this agent had not been previously isolated from the region. Borrelia bissettii, a related species that has not been implicated as a common causative agent of Lyme disease, was isolated in small rodents inhabiting coastal scrub and chaparral habitats in a previous San Luis Obispo County study ...


An Invasive Grass And A Desert Adapted Rodent: Is There An Effect On Locomotory Performance And Is It Modified By Prior Experience Or Familiarization?, Camille D. Boag Oct 2015

An Invasive Grass And A Desert Adapted Rodent: Is There An Effect On Locomotory Performance And Is It Modified By Prior Experience Or Familiarization?, Camille D. Boag

Master's Theses and Project Reports

Kangaroo rats (Dipodomys spp.) are frequently characterized as keystone species for their role in altering soil characteristics, changing habitat structure through seed consumption and dispersal, and being important primary consumers in their ecosystem. They are arid adapted and known to forage in areas with sparse vegetation. Studies suggests densely vegetated habitat to be unsuitable for kangaroo rats because plants are an impediment to their locomotion and predator avoidance behaviors. This study focuses on an invasive grass, South African Veldt (Ehrharta calycina), that converts landscapes with sparse vegetation into dense grassland habitats, and the Lompoc kangaroo rat (Dipodomys heermanni arenae) that ...


Effects Of Supplemental Hydration On Physiology And Behavior Of Northern Pacific Rattlesnakes (Crotalus Oreganus Oreganus), Griffin D. Capehart Oct 2015

Effects Of Supplemental Hydration On Physiology And Behavior Of Northern Pacific Rattlesnakes (Crotalus Oreganus Oreganus), Griffin D. Capehart

Master's Theses and Project Reports

Hydration is a critical element for many physiological processes in vertebrates, such as protein production, innate immunity, and behavioral processes such as daily activity and thermoregulation. Few studies have directly assessed the effect of hydration on these animals in nature. While it seems intuitive that drought is stressful to animals, studies examining drought are typically observational and fail to assess how the hydration state of these animals influences their physiology and behavior. We tested for an effect of hydration on several physiological and behavioral parameters in Northern Pacific rattlesnakes (Crotalus oreganus oreganus) by experimentally manipulating hydration levels in the field ...


How Are Rare Species Maintained?: Reproductive Barriers Between Layia Jonesii, A Rare Serpentine Endemic, And L. Platyglossa, Natalie L. Rossington Sep 2015

How Are Rare Species Maintained?: Reproductive Barriers Between Layia Jonesii, A Rare Serpentine Endemic, And L. Platyglossa, Natalie L. Rossington

Master's Theses and Project Reports

Reproductive barriers are vital to generating new species as well as maintaining distinct species. Investigating reproductive barriers between closely related plant taxa helps us to understand how these barriers are maintained, particularly between rare and widespread relatives. Layia jonesii, a rare San Luis Obispo County serpentine endemic, and L. platyglossa, a common coastal species, co-occur on serpentine derived hillsides and are interfertile. At these locations, L. jonesii is isolated to dry soils near serpentine rock outcrops and L. platyglossa is located on slightly deeper grassland soils surrounding the rock outcrops. On hillsides where they co-occur, I observe two morphologically distinct ...


Multi-Stress Proteomics: The Global Protein Response To Multiple Environmental Stressors In The Porcelain Crab Petrolisthes Cinctipes, Michael A. Garland Sep 2015

Multi-Stress Proteomics: The Global Protein Response To Multiple Environmental Stressors In The Porcelain Crab Petrolisthes Cinctipes, Michael A. Garland

Master's Theses and Project Reports

Global climate change is increasing the number of hot days along the California coast as well as increasing the incidence of off-shore upwelling events that lower the pH of intertidal seawater; thus, intertidal organisms are experiencing an increase in more than one stress simultaneously. This study seeks to characterize the global protein response of the eurythermal porcelain crab Petrolisthes cinctipes to changes in thermal, pH, and tidal regime treatments, either combined or individually. The first experiment examined temperature stress alone and sought to determine the effect of chronic temperature acclimation on the acute heat shock response. We compared the proteomic ...


Morphological Response In Sister Taxa Of Woodrats (Genus: Neotoma) Across A Zone Of Secondary Contact, Michaela M. Koenig Sep 2015

Morphological Response In Sister Taxa Of Woodrats (Genus: Neotoma) Across A Zone Of Secondary Contact, Michaela M. Koenig

Master's Theses and Project Reports

This study focuses on a secondary contact zone between two sister species of woodrat, Neotoma fuscipes (dusky-footed woodrat) and N. macrotis (big-eared woodrat). Along the Nacimiento River, on the border of southern Monterey and northern San Luis Obispo counties, the ranges of these sister species of woodrats meet and overlap forming a secondary contact zone. The zone of secondary contact is estimated to include a 500-meter (~1,650 linear feet) portion of the Nacimiento River riparian corridor.

This research examines quantifiable morphological change that is likely associated with heightened inter-specific competition within the contact zone. When in sympatry the sister ...


Effects Of Testosterone On The Spatial Ecology, Coloration, And Brain Regions In Western Fence Lizards, Sceloporus Occidentalis, Rachel Catharine Wilson Sep 2015

Effects Of Testosterone On The Spatial Ecology, Coloration, And Brain Regions In Western Fence Lizards, Sceloporus Occidentalis, Rachel Catharine Wilson

Master's Theses and Project Reports

An organism’s spatial ecology allows for access to essential resources such as food, mates, and escape from predators. Home range size, or the total area an organism inhabits, varies in relation to numerous factors including seasonality. During the breeding season, home range size increases in males across taxa. In addition, males usually also have larger home range sizes than females. This implicates testosterone (T) as a possible mediator of this relationship. Indeed, T causes an increase in home range size of males in numerous species of lizards. In addition to T causing an increase in home range size, it ...


Demographics And Transfer Of Escherichia Coli Within Bos Taurus Populations, Joshua Ryan Dillard Sep 2015

Demographics And Transfer Of Escherichia Coli Within Bos Taurus Populations, Joshua Ryan Dillard

Master's Theses and Project Reports

In the United States, symptoms caused by pathogenic strains of Escherichia coli are on the rise. A major source of these pathogenic strains is the E. coli in the digestive tract of cattle. The purpose of this project was to determine if E. coli are transferred between individuals of the same species and if interspecies transmission is possible. Proximity of cattle was also studied as a contributing factor to the transfer of E. coli. To accomplish this goal, E. coli isolates from cattle and cohabitating ground squirrels were compared through a new method of bacterial strain typing called pyroprinting. Bulls ...


An Investigation Of The Effect Of Malathion On Adaptive Plasticity Of Pseudacris Sierra, Michael Jonathan Maples Aug 2015

An Investigation Of The Effect Of Malathion On Adaptive Plasticity Of Pseudacris Sierra, Michael Jonathan Maples

Master's Theses and Project Reports

This thesis is composed of two chapters. Chapter one reviews what is known about adaptive plasticity in response to predators, describes the physiological systems involved in such plasticity, and outlines the evolutionary consequences of adaptive plasticity. Chapter two describes a scientific experiment that investigates how malathion may impact adaptive plasticity in the Sierran Treefrog, Pseudacris sierra. Anuran tadpoles suffer high mortality rates due to predation. In response to strong selective forces relating to these high predation rates, tadpoles evolved the ability to adaptively respond to predators through morphological and behavioral plasticity. The morphological and behavioral responses are varied and depend ...


Wireless Sensor Mesh Network For Irrigation Systems, Rosana Cheruvelil, Oswaldo Garcia, Nabil Haque, Justin Ignacio, Stanley Thomas Jun 2015

Wireless Sensor Mesh Network For Irrigation Systems, Rosana Cheruvelil, Oswaldo Garcia, Nabil Haque, Justin Ignacio, Stanley Thomas

Electrical Engineering

Pepper Oak Farms, a company that grows their own olives for olive oil and has approximately 40,000 olive trees, is in need of an efficient way to monitor the soil and atmospheric conditions that are critical to the cultivation of their trees. The company at the moment only has two sensors and has to manually place the sensors at different locations to collect data on soil moisture and temperature. This is expensive, time consuming, and a lot of effort on the owner’s part to go out on the fields to collect this data. As a solution, the company ...


A Livestock Employee Manual For Junior Livestock Shows, Kylin Costa Jun 2015

A Livestock Employee Manual For Junior Livestock Shows, Kylin Costa

Agricultural Education and Communication

The purpose of this project was to create a manual for junior livestock show staff to abide by for the duration of a county fair’s show. By implementing the manual, the show process should run smoother, and should alleviate turnover problems with each new barn steward that comes into the fair. The author hopes that this manual will be of use at fairs statewide.


Simangus Crossbreeding Proposal, Kaity Arburua Jun 2015

Simangus Crossbreeding Proposal, Kaity Arburua

Agricultural Education and Communication

The purpose of this project is to develop a proposal for a crossbreeding plan specifically oriented towards a Central Valley beef producer interested in SimAngus cattle. In this project you will find information pertaining to the Simmental, Angus and SimAngus breeds, as well as industry goals and possible outcomes. This was designed in order to create tangible evidence and information, such a pamphlet/brochure, for the producer to evaluate; in hopes that the beef producer will implement this crossbreeding plan.


Determining Colonization Efficacy Of Commercial Mycorrhizae Products And Fragaria X Anannassa ‘Albion’., Tommy Jue, Alexandra Wollenman Jun 2015

Determining Colonization Efficacy Of Commercial Mycorrhizae Products And Fragaria X Anannassa ‘Albion’., Tommy Jue, Alexandra Wollenman

Horticulture and Crop Science

No abstract provided.


Sports For Nathan, Delaney Bales, Joseph Garrett, Chris Harter Jun 2015

Sports For Nathan, Delaney Bales, Joseph Garrett, Chris Harter

Mechanical Engineering

Nathan Cooper is a local boy with spinal muscular atrophy. He enjoys playing games and being active. One assistive device that Nathan uses is his Standing Dani, a motorized mobile stander. Nathan enjoys playing golf and kickball, and prior to this project he had no way of playing golf and no safe way of playing kickball. The purpose of this project was to design and build a golf attachment for Nathan’s Standing Dani that allows him to putt, and a kickball attachment that allows him to play kickball safely. First, the design team researched and defined the problem in ...


High Moisture Extrusion Of Oatmeal, Brandon F. Coleman Jun 2015

High Moisture Extrusion Of Oatmeal, Brandon F. Coleman

Master's Theses and Project Reports

Oats are considered to be a highly nutritious breakfast food available to consumers. Heightened consumer interest in functional food products and advances in human nutrition have led to increased levels of interest in the development of new oat based products (Webster and Wood 2011). Developments in technology have led to manufacturing of instant oatmeal, making the product more convenient to consumers. Low moisture extrusion processing is one of the most widely used methods to produce ready to eat breakfast cereals; however, there has been little research carried out to determine if high moisture extrusion methods would be viable. This study ...


Screening Of Biocontrol Organisms For The Management Of Phytopathogenic Fungi And Foodborne Pathogens On Produce, Antoinette Boyee De Senna Jun 2015

Screening Of Biocontrol Organisms For The Management Of Phytopathogenic Fungi And Foodborne Pathogens On Produce, Antoinette Boyee De Senna

Master's Theses and Project Reports

The multibillion dollar agricultural industry is an important part of the United States economy, and the management of factors that affect crop and human health is imperative to maintaining this economic sector. The fungi Botrytis cinerea, Fusarium pallidoroseum, and Fusarium moniliforme are the causative agents of several plant diseases and can cause significant crop loss both before and after harvest in commodities such as strawberries, lettuce, citrus, and grains. Fungicides are employed to control these phytopathogens, but the use of these chemicals has led to an increase in fungicide resistance and may negatively affect the environment and human health. In ...


Investigation Of Larval Sensory Systems In The Marine Bryozoan, Bugula Neritina, Heather Leigh Price Jun 2015

Investigation Of Larval Sensory Systems In The Marine Bryozoan, Bugula Neritina, Heather Leigh Price

Master's Theses and Project Reports

Bugula neritina is a sessile marine bryozoan with a pelagic larval stage. Larvae frequently settle on boat hulls, facilitating the introduction of B. neritina to bays and estuaries worldwide. Adrenergic agonists, such as the vertebrate hormone noradrenaline, inhibit larval settlement in a variety of marine invertebrate species, including B. neritina. Light also inhibits B. neritina larval settlement, yet the underlying mechanisms by which light and adrenergic compounds exert their effects on larvae are not well understood. Octopamine is considered the invertebrate analog of noradrenaline, and may be an endogenous hormone involved in larval settlement pathways. I observed the effects of ...


Orchard Management Practices And Handbook, Brian A. Snyder, Kellie M. Mancino Jun 2015

Orchard Management Practices And Handbook, Brian A. Snyder, Kellie M. Mancino

Agricultural Education and Communication

The purpose of this project was to develop an SAE start-up handbook for the Hollister FFA program's orchard. The orchard was being underutilized by the chapter and the hopes are that the chapter will supply students with this handbook allowing for a more diverse group of SAE projects within the chapter. Implementing the steps outlined in this handbook would also create a more competitive chapter in the areas of proficiencies and degrees.


Virulence Gene Expression Of Vibrio Parahaemolyticus In The Viable But Nonculturable State, Tiffany Pui-Yun Tse Jun 2015

Virulence Gene Expression Of Vibrio Parahaemolyticus In The Viable But Nonculturable State, Tiffany Pui-Yun Tse

Master's Theses and Project Reports

Vibrio parahaemolyticus is a food-borne pathogen commonly associated with the consumption of raw or undercooked seafood resulting in primary infections of the human gastrointestinal tract. It is estimated to cause about 4500 illnesses each year in the United States. However, infection from this food-borne pathogen can be avoided if this organism is detected in the implicated food, prior to consumption. Current standard methods of detecting this organism are dependent on the culturability of the bacteria. Detection based on an organism’s culturability may be problematic as V. parahaemolyticus has been known to exist in a viable but nonculturable (VBNC) state ...


Consumer Evaluation: The Link Between Body Mass Index, Reward Sensitivity, Product Liking And Emotion, Malori Comer Jun 2015

Consumer Evaluation: The Link Between Body Mass Index, Reward Sensitivity, Product Liking And Emotion, Malori Comer

Master's Theses and Project Reports

The objectives of this study were: (1) to evaluate consumer acceptance of cheeses varying in fat and sodium levels, (2) to determine if sensitivity to reward and body mass index has an effect on product liking based on fat or salt content, (3) to evaluate the use of FaceReader technology during consumer evaluation and, (4) to determine if consumer’s self-selected, conscious emotions matched with the expressed, subconscious emotions acquired by FaceReader.

Consumer acceptance testing (n=108) was conducted on two medium cheddar cheeses with varying fat levels and two low-moisture part-skim mozzarella cheeses varying in sodium levels. Attributes were ...


Exploring The Physiological Role Of Vibrio Fischeri Pepn, Sally L. Cello Apr 2015

Exploring The Physiological Role Of Vibrio Fischeri Pepn, Sally L. Cello

Master's Theses and Project Reports

The primary contributor to Vibrio fischeri aminopeptidase activity is aminopeptidase N, PepN. Colonization assays revealed the pepN mutant strain to be deficient at forming dense aggregates and populating the host’s light organ compared to wildtype within the first 12 hours of colonization; however the mutant competed normally at 24 hours. To address the role of PepN in colonization initiation and establish additional phenotypes for the pepN mutant strain, stress response and other physiological assays were employed. Marked differences were found between pepN mutant and wildtype strain in response to salinity, acidity, and antibiotic tolerance. This study has provided a ...


Graduate Internship Report - Ann Sobrato High School, Adeline Grace Amador Mar 2015

Graduate Internship Report - Ann Sobrato High School, Adeline Grace Amador

Graduate Internship Reports in Agricultural Education

This internship report includes validation documents required in meeting the quality criteria for secondary-level programs of instruction in agriculture. The documents are concurrently used for the Agriculture Incentive Grant review process at Ann Sobrato High School conducted by representatives of the California Department of Education. The internship included the restructuring and designing of the curriculum for an Agriculture Leadership class. It also includes development of a set of directions and a scoring rubric for the FFA iRecordbook. Finally, it includes the redevelopment of curriculum for Agriculture Biology and Agriculture Geology classes related to the Next Generation Science Standards. This includes ...


Designing A Natural Resource Workshop For Students: Working With Wood: Adventures In Forestry, Maddison Easley Mar 2015

Designing A Natural Resource Workshop For Students: Working With Wood: Adventures In Forestry, Maddison Easley

Agricultural Education and Communication

There is a need for additional education focused on natural resource related careers and issues. As communities become further removed from these subjects, hands-on workshops and educational trainings are necessary to rekindle interest in these topics, especially in regards to application in fields like agriculture. The goal of this project was to create a logical outline to follow when designing and implementing natural resource workshops. An additional outcome of the project involved the implementation of a forestry workshop through the 26 Hours of Science and Technology program at California Polytechnic State University on March 11, 2015. The outline provided in ...