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Humboldt State University

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Articles 1 - 30 of 245

Full-Text Articles in Life Sciences

Willis Linn Jepson, James P. Smith Jr., John O. Sawyer Jr. May 2019

Willis Linn Jepson, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


A Checklist Of The Families And Genera Of Vascular Plants Of California, James P. Smith Jr., John O. Sawyer Jr. May 2019

A Checklist Of The Families And Genera Of Vascular Plants Of California, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Vascular Plant Families And Genera Endemic To The Conterminous United States, James P. Smith Jr May 2019

Vascular Plant Families And Genera Endemic To The Conterminous United States, James P. Smith Jr

Botanical Studies

No abstract provided.


A Checklist Of The Vascular Plants Of The Trinity Alps, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

A Checklist Of The Vascular Plants Of The Trinity Alps, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


North America Floras, Manuals, & Checklist: A Bibliography, James P. Smith Jr Apr 2019

North America Floras, Manuals, & Checklist: A Bibliography, James P. Smith Jr

Botanical Studies

No abstract provided.


Vascular Plants Of Horse Mountain (Humboldt County, California), James P. Smith Jr, John O. Sawyer Jr. Apr 2019

Vascular Plants Of Horse Mountain (Humboldt County, California), James P. Smith Jr, John O. Sawyer Jr.

Botanical Studies

No abstract provided.


Vascular Plants Of The Big And Little Duck Lakes (Siskiyou County, California), James P. Smith Jr Apr 2019

Vascular Plants Of The Big And Little Duck Lakes (Siskiyou County, California), James P. Smith Jr

Botanical Studies

No abstract provided.


Vascular Plants Of The Stony Creek Bog Area Del Norte County, California, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

Vascular Plants Of The Stony Creek Bog Area Del Norte County, California, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


A Checklist Of The Vascular Plants Of Scott Mountain, James P. Smith Jr., John O. Sawyer Jr. Apr 2019

A Checklist Of The Vascular Plants Of Scott Mountain, James P. Smith Jr., John O. Sawyer Jr.

Botanical Studies

No abstract provided.


African Affinity Mask, Giselle M. Strauss Mar 2019

African Affinity Mask, Giselle M. Strauss

Toyon Literary Magazine

N/A


Ecological Consequences Of Sea Star Wasting Disease: Non-Consumptive Effects And Trait-Mediated Indirect Interactions From Pisaster Ochraceus, Timothy Ian Mcclure Jan 2019

Ecological Consequences Of Sea Star Wasting Disease: Non-Consumptive Effects And Trait-Mediated Indirect Interactions From Pisaster Ochraceus, Timothy Ian Mcclure

Theses and projects

Consumptive effects (CEs) of predators are an important factor in structuring biological communities, but further work is needed to understand how the interaction between spatial and temporal differences in predator density affects non-consumptive effects (NCEs) on prey. NCEs can cause indirect effects on food resources, known as trait-mediated indirect interactions (TMIIs), and thus can also affect community structure. However, few studies have considered the relationships between spatial and temporal predator density variation and the strength of NCEs and TMIIs in the natural environment. The ochre star Pisaster ochraceus is common predator of the herbivorous black turban snail Tegula funebralis, imposing ...


Targeting Social Cohesion In Female Roosevelt Elk (Cervus Canadensis Roosevelti) Groups Minimizes Survey Efforts For Fecal Dna Capture-Recapture Estimates Of Abundance, Rudolph Gabriel Mena Jan 2019

Targeting Social Cohesion In Female Roosevelt Elk (Cervus Canadensis Roosevelti) Groups Minimizes Survey Efforts For Fecal Dna Capture-Recapture Estimates Of Abundance, Rudolph Gabriel Mena

Theses and projects

Group size abundance estimates of Roosevelt elk (Cervus canadensis roosevelti) in Humboldt and Del Norte counties, California have largely been inferred through visual counts. However immigration and emigration, the inability to sight elk behind viewing obstructions, and a lack of individual identifiers makes precise and accurate estimates difficult to obtain. Using DNA collected through fecal samples left by elk groups can aid in addressing these difficulties. I tested the hypothesis that GPS (Global Positioning System) collar data from adult female elk could indicate discrete site use locations of their social groups, which in turn yield sufficient sample sizes for use ...


Converting Coast Redwood/Douglas-Fir Forests To Multiaged Management: Residual Stand Damage, Tree Growth, And Regeneration, Robert Thomas Muma Jan 2019

Converting Coast Redwood/Douglas-Fir Forests To Multiaged Management: Residual Stand Damage, Tree Growth, And Regeneration, Robert Thomas Muma

Theses and projects

There is increased interest in multiaged management as a silvicultural and restoration tool in redwood forests of California. The effect of varying residual densities and spatial arrangements on residual stand damage, tree growth and regeneration was studied in a multicohort silviculture experiment on Jackson Demonstration State Forest. Four treatments varying in residual stand density or spatial arrangement were replicated at four sites. The experiment provided 4-year periodic growth measurements of residual trees and annual measurements of redwood and tanoak sprout height increments. Residual trees were more likely to sustain bole scarring when retained at higher densities. Crown damage was more ...


Childhood And Trauma: The Effects Of Adverse Childhood Experiences On The Brain, Behavior, And Learning In The Elementary School Classroom, Aeryn Aguilar Jan 2019

Childhood And Trauma: The Effects Of Adverse Childhood Experiences On The Brain, Behavior, And Learning In The Elementary School Classroom, Aeryn Aguilar

Theses and projects

A variety of studies have been conducted on how trauma, caused by emotional, physical, or verbal abuse, impact children’s lives. Many of the studies which involved observations and assessments were done with the preexisting knowledge that these children had been through a traumatic experience. Instead of looking at behavior of known cases, this study’s goal is to find out whether or not children’s observable behaviors can predict cases of trauma. For example, is acting out or defiance a key sign of trauma or is it part of the typical development for the elementary school-age group? This thesis ...


Application Of The Predicted Repetitions-To-Failure Perceived Exertion Scale For The Nfl-225lb Bench Press Test, Anthony G. Ratto Jan 2019

Application Of The Predicted Repetitions-To-Failure Perceived Exertion Scale For The Nfl-225lb Bench Press Test, Anthony G. Ratto

Theses and projects

PURPOSE: To assess how accurately Division II NCAA football players can predict repetitions-to-failure (RTF) during the bench press exercise using an absolute load of 225-lbs by comparing predicted repetitions-to-failure with actual repetitions-to-failure. METHODS: Twenty football players (age 20 ± 2 years; height 1.85 ± .06 m; weight 110.1 ± 19.3 kg) without muscular or skeletal injuries were tested for their 1repetition maximum (1-RM) in the bench press, and then performed 1 set to concentric failure with 225-lbs. Subjects predicted how many repetitions they could perform after the warm-up and again after the fourth, eighth, twelfth repetitions. A general regression analysis ...


Exercise And The Fffects Of Off-Task Time Behavior During Academic Time Among Children With Disabilities, Morgan L. Wood Jan 2019

Exercise And The Fffects Of Off-Task Time Behavior During Academic Time Among Children With Disabilities, Morgan L. Wood

Theses and projects

BACKGROUND: Physical activity participation has decreased, especially for the special education community. With no time for exercise, or the proper exercise, on task time for children with intellectual disabilities can be a very challenging time.

PURPOSE: The purpose of this study was to examine the impact of a physical activity program (i.e., yoga) on the total number of off-task behaviors and total time on-task for children with I.D. during their academic period.

METHODS: On task time data will be collected during control and experimental sessions. Statistical analysis will be conducted to determine if exercise before instructional time effects ...


Spatial Variability In Recruitment Of Chilipepper Rockfish (Sebastes Goodei) In The California Current System, Laura K. Solinger Jan 2019

Spatial Variability In Recruitment Of Chilipepper Rockfish (Sebastes Goodei) In The California Current System, Laura K. Solinger

Theses and projects

Properly describing variability in population dynamics (e.g., growth, fecundity, recruitment) is expected to improve management of important fisheries stocks (Maunder & Piner, 2014). As recruitment to most fish stocks is determined during early life history stages (Houde, 1997; Iles & Beverton, 2000), and early life history stages are influenced by oceanographic conditions (Bjorkstedt et al. 2002; Laidig, 2010), understanding how environmental stochasticity influences recruitment deviations has potential to improve estimates of stock productivity and how productivity might change over time to support more effective management. Chilipepper Rockfish (Sebastes goodei) are an important commercial species that is managed as a single population throughout the continental US (Field et al. 2015), yet spatiotemporal heterogeneity of oceanographic conditions is likely to cause variability in recruitment deviations throughout this range. Field and Ralston (2005) used region-based catch-at-age data ...


Tree Squirrels And Fishers In Northern California: The Effects Of Masting Hardwoods On Stand Use, Andria M. Townsend Jan 2019

Tree Squirrels And Fishers In Northern California: The Effects Of Masting Hardwoods On Stand Use, Andria M. Townsend

Theses and projects

In western North America, tree squirrels such as western gray (Sciurus griseus) and Douglas squirrels (Tamiasciurus douglasii) are potentially important prey for fishers (Pekania pennanti). Western gray squirrels in particular may be highly ranked due to their large body size. Masting trees including black oak (Quercus kelloggii) and tanoak (Notholithocarpus densiflorus) produce an important food source for tree squirrels; therefore, forest stands containing these trees may be useful to foraging fishers. I hypothesized that; 1) the abundance of western gray and Douglas squirrels in a stand is influenced by the mast production capacity of that stand, and 2) fisher stand ...


Analysis Of Aboral Spine Variation In The Forcipulate Sea Star, Pisaster Ochraceus (Brandt 1835), Angela Jordane Jones Jan 2019

Analysis Of Aboral Spine Variation In The Forcipulate Sea Star, Pisaster Ochraceus (Brandt 1835), Angela Jordane Jones

Theses and projects

Rocky intertidal zones are highly dynamic environments that exhibit substantial spatial and temporal variation in abiotic conditions, which can drive body form variation and energy allocation within calcifying species. Wave exposure, specifically, has been shown to be a significant driver of skeletal and structural morphology in organisms including gastropods, bivalves, and sponges. Many of such organisms, from sponges to echinoderms, rely on calcium carbonate for structural support and protection.

In the phylum Echinodermata (named for possessing a ‘spiny skin’), research on the form and function of calcium carbonate spines is largely relegated to Class Echinodea (e.g., urchins and sand ...


The Effect Of Yoga On The Total Number Of Off-Task Behaviors For Children With Autism Spectrum Disorder, Ashley N. Jovick Jan 2019

The Effect Of Yoga On The Total Number Of Off-Task Behaviors For Children With Autism Spectrum Disorder, Ashley N. Jovick

Theses and projects

BACKGROUND: Autism spectrum disorder (ASD) is a complex developmental disability. Signs will usually appear during early childhood and affect a person’s ability to communicate and interact with others. ASD is defined by a certain set of behaviors and is a ‘spectrum condition’ that affects individuals differently and to varying degrees. Two major behaviors associated with ASD are poor motor skills and sensory activities.

PURPOSE: The purpose of this investigation is to examine the effectiveness of yoga on reducing off-task behaviors in children with Autism Spectrum Disorder.

METHODS: Off-task behavior data will be taken in Baseline and Intervention Phases. Video ...


Distribution Of Sea Star Wasting Disease Symptoms In Pisaster Ochraceus In The Rocky Intertidal Zone, Jana N. Litt Jan 2019

Distribution Of Sea Star Wasting Disease Symptoms In Pisaster Ochraceus In The Rocky Intertidal Zone, Jana N. Litt

Theses and projects

Beginning in 2013, many species of sea stars (phylum Echinodermata) along the Pacific coast experienced severe mortality due to sea star wasting disease (SSWD). The ochre sea star, Pisaster ochraceus, experienced one of the highest mortality rates during this outbreak. To test the hypothesis that the intertidal distribution of ochre sea stars influences the incidence and progression of SSWD symptoms, I documented the occurrence of symptoms and survivorship in adult and juvenile stars in the upper and lower portions of the mid-intertidal zone. I also chronicled the progression of SSWD symptoms among individually tagged adult stars to assess changes in ...


Long-Term Effectiveness Of Fuel Treatments In Oak And Chaparral Stands Of Northern California, Caroline Ann Martorano Jan 2019

Long-Term Effectiveness Of Fuel Treatments In Oak And Chaparral Stands Of Northern California, Caroline Ann Martorano

Theses and projects

Fuel reduction treatments are broadly implemented to reduce the risk of extreme wildfire. Yet, research on the long-term effectiveness and ecological consequences among these treatments is lacking. In this study, I examined short- and long-term changes in fuels and understory vegetation after treatment in chaparral and oak-dominated stands of Whiskeytown National Recreation Area. Treatments included mastication and spring burning, spring burning only, mastication only, and hand-thinning. Treatments were applied randomly to 1 to 2 units within each of 10 blocks. Two plots were established in each treatment unit and fuel and vegetation data was collected and analyzed at the block ...


The Effects Of Circuit Training On Decreasing Off-Task Behaviors For Children With Autism Spectrum Disorder, Juan C. Hernandez Jan 2019

The Effects Of Circuit Training On Decreasing Off-Task Behaviors For Children With Autism Spectrum Disorder, Juan C. Hernandez

Theses and projects

Autism spectrum disorder (ASD) is the fastest growing developmental disability according to Centers for Disease Control and Prevention (CDC). Prevalence shows that 1 in 59 children are born with Autism Spectrum Disorder, and having this population engage in physical activity will reduce off-task behavior. The purpose of this study is to determine the benefits of circuit training on decreasing off-task behavior while improving health for children with Autism Spectrum Disorder, and encourage parents, teachers, and specialist to incorporate similar drills, activities, and exercises with the ASD population. In this study, a special education high school teacher and APE instructor will ...


Effects Of A Race Timer On The Three Minute All-Out Test For Critical Power, Paul K. Mandell Jan 2019

Effects Of A Race Timer On The Three Minute All-Out Test For Critical Power, Paul K. Mandell

Theses and projects

Maximal exercise testing is commonly employed by exercise scientists in order to assess an athlete's’ capabilities and inform future training goals and tactics. The Critical Power (CP) concept provides a novel perspective on the physiological capacity of an individual to perform work. The 3 Minute All-Out Test (3MT) for critical power was developed by Vanhatalo, Doust, & Burnley in 2006. Concerns about pacing during the test lead to the development of protocol which blinds participants to time during the test. Twelve healthy active males were recruited to participate in the current study on the effects of a race timer on ...


Evaluation Of Range-Wide Occupancy And Survey Methods For The Giant Kangaroo Rat (Dipodomys Ingens), Alyssa E. Semerdjian Jan 2019

Evaluation Of Range-Wide Occupancy And Survey Methods For The Giant Kangaroo Rat (Dipodomys Ingens), Alyssa E. Semerdjian

Theses and projects

Though habitat suitability and occupancy are often correlated, they cannot always be inferred from each other. Therefore, a solid understanding of both is essential to effectively manage species. Recent studies have assessed range-wide habitat suitability for the giant kangaroo rat (Dipodomys ingens; GKR), but data regarding occupancy is lacking in parts of its distribution. Satellite and aerial imagery were used to identify GKR burrows across their known range, producing a range-wide occupancy map and non-invasive survey methods including track plates, manned flight, unmanned aerial vehicle, and sign surveys were conducted to determine effective methods for monitoring GKR occupancy. The range-wide ...


The Effect Of Manipulating Vertical Motion On Running Economy, Claire Copriviza Jan 2019

The Effect Of Manipulating Vertical Motion On Running Economy, Claire Copriviza

Theses and projects

While several biomechanical factors have been identified as key determinants of running economy (i.e. metabolic cost), the influence of individual mechanical factors such as center of mass vertical motion (ΔCoMz) remains unclear. The purpose of this study was to determine how manipulating ΔCoMz effects running economy. Twelve runners used a visual biofeedback system to control their ΔCoMz during running as we measured the metabolic, kinematic, and muscle activation responses to the different levels of ΔCoMz. Running economy was strongly correlated to ΔCoMz and was optimized at an intermediate center of mass vertical motion of ...


The Effect Of Interval Intensity On Time To Exhaustion During High Intensity Interval Training (Hiit) Running In Recreational Male Runners, Andrew M. Hahn Jan 2019

The Effect Of Interval Intensity On Time To Exhaustion During High Intensity Interval Training (Hiit) Running In Recreational Male Runners, Andrew M. Hahn

Theses and projects

High Intensity Interval Training (HIIT) has become extremely popular in recent years, however, current HIIT prescriptions lack guidelines regarding interval intensities and associated margins. The purpose of this study is to investigate Run Time to Exhaustion (Te) and provide insight regarding HIIT intensities for future aerobic exercise programming. Ten healthy adult male recreational runners (Age=22.9 ± 2.5 yr., Ht=1.72 ± 0.1m, BM=74.1 ± 7.4 kg) measured maximal oxygen consumption (VO2max) (52.4 ± 6.1ml/kg/min) with a graded exercise test (GXT). Running speed was determined using ACSM running equation for exercise metabolism. Protocols ...


A Time- And State-Based Approach To Estimate Winter Movement And Survival Of Juvenile Coho Salmon (Oncorhynchus Kisutch) In Freshwater Creek, California, Nicholas Paul Van Vleet Jan 2019

A Time- And State-Based Approach To Estimate Winter Movement And Survival Of Juvenile Coho Salmon (Oncorhynchus Kisutch) In Freshwater Creek, California, Nicholas Paul Van Vleet

Theses and projects

Accounting for life history diversity and overwinter survival of juvenile Coho Salmon is important to inform restoration and recovery efforts for this threatened species. Multiple seaward migration patterns of Coho Salmon have been identified, including spring fry migrants, fall and winter parr migrants, and spring smolt migrants. Previous studies have indicated that spring smolt migrants have low overwinter survival rates while they are rearing in upstream habitats, suggesting that freshwater overwinter survival may be one factor that limits smolt production. However, previous research did not account for the early emigration of fall and winter parr migrants from the study area ...


Freshwater And Marine Survival Of Coho Salmon (Oncorhynchus Kisutch) As A Function Of Juvenile Life History, Grace Katherine Ghrist Jan 2019

Freshwater And Marine Survival Of Coho Salmon (Oncorhynchus Kisutch) As A Function Of Juvenile Life History, Grace Katherine Ghrist

Theses and projects

Juvenile Coho Salmon (Oncorhynchus kisutch) in coastal California streams exhibit various life history strategies during their freshwater development. One strategy of interest to managers and conservationists is the early migrant. Juvenile early migrants emigrate from natal habitat into lower parts of the watershed or estuary during their first fall or winter, where they rear before migration to the ocean. By contrast, the more prevalent spring migrant resides in natal reaches over the winter and migrates directly to the ocean the following spring. Salmon monitoring programs generally estimate juvenile production and demographic rates using only spring migrants, and these estimates are ...


Effects Of Longline Oyster Aquaculture On Benthic Invertebrate Communities In Humboldt Bay, California, Hannah C. Coe Jan 2019

Effects Of Longline Oyster Aquaculture On Benthic Invertebrate Communities In Humboldt Bay, California, Hannah C. Coe

Theses and projects

Oyster aquaculture has had a commercial presence in Humboldt Bay for nearly 60 years and has experienced changes in scope and methodology as the industry has grown. The traditional method of bottom-culture oyster beds has been phased out, with longline oyster aquaculture becoming the common replacement. However, this transition has preceded much of the research regarding potential impacts to the broader ecosystem. The benthic invertebrate community of Humboldt Bay is a vital food source for many commercially important fishes, as well as for the many shorebirds that utilize Humboldt Bay. The importance of the invertebrate community to the ecosystem highlights ...