Open Access. Powered by Scholars. Published by Universities.®

Ecology and Evolutionary Biology Commons™

Open Access. Powered by Scholars. Published by Universities.®

Behavior

Discipline
Institution
Publication Year
Publication
Publication Type
File Type

Articles 1 - 30 of 196

Full-Text Articles in Ecology and Evolutionary Biology

Infrared Detectability Of Whale Species And Behaviors To Enhance Automatic Detection For Real-Time Vessel Strike Avoidance, Laura J. Howes Aug 2026

Infrared Detectability Of Whale Species And Behaviors To Enhance Automatic Detection For Real-Time Vessel Strike Avoidance, Laura J. Howes

Graduate Masters Theses

Real-time detection of large whales at sea is critical for mitigating serious injury and mortality from ship strikes and other human activities such as seismic surveys, especially for endangered species such as the critically endangered North Atlantic Right Whale (Eubalaena glacialis). Traditional marine mammal observers are limited by environmental conditions and human factors, necessitating a robust, 24-hour solution. This study investigates the efficacy of a novel onboard detection tool infrared (IR) technology to detect whale blows and body parts. While IR is a promising advancement, its performance under varying sea conditions (e.g., fog, humidity) and its ability to …

Go to article

Structure And Diversity Of Play Behavior In Juvenile Belding's Ground Squirrels, Paul O'Driscoll Ii May 2026

Structure And Diversity Of Play Behavior In Juvenile Belding's Ground Squirrels, Paul O'Driscoll Ii

Master's Theses

Play behavior is ubiquitous among juvenile mammals and can promote motor, social, and cognitive development, providing multiple adaptive benefits to young animals in some cases. The structure of play can be linked to the benefits it confers on individuals. I evaluated the structure of play in juvenile Belding’s ground squirrels (Urocitellus beldingi), a species for which multiple adaptive benefits of play have been identified. I compared juvenile play in U. beldingi to adult sexual and aggressive behavior to determine and classify similarities between juvenile play and adult behavior. I evaluated diversity in the behaviors expressed during play interactions and diversity …

Go to article

Beluga Buddies: The Preferred Social Network Of Belugas In Managed Care, Valery Marinelarena, Diamond Garcia Apr 2026

Beluga Buddies: The Preferred Social Network Of Belugas In Managed Care, Valery Marinelarena, Diamond Garcia

Posters - 2026

Belugas societies are not fixed  and group composition is everchanging. Group composition can also influence behavior. This study aims to examine the preferred social networks and the role age plays in the behavioral diversity within a group of managed care belugas housed at Sea World San Antonio. Results Supported TYO had a preferred, non-random social network and ATL performing more chinslaps than TYO.

Go to article

Interactions Between Red Foxes And Coyotes Across Urban And Wild Habitats, Caroline E. Savage, Taylor S. Readyhough, Remington J. Moll, Jonathon D. Cepek Jan 2026

Interactions Between Red Foxes And Coyotes Across Urban And Wild Habitats, Caroline E. Savage, Taylor S. Readyhough, Remington J. Moll, Jonathon D. Cepek

UNH URC Open (2026 and after)

Dens are critical to the life history of many mammal species, particularly when raising young. Excavating a den is energetically costly, so several species can use existing dens, and multiple species may inhabit the same den complex simultaneously. However, the extent of den sharing among urban mammals is understudied. Between March 2021, and June 2023, we used camera traps to monitor a multi-species den site in Cleveland, Ohio, USA. We documented den visitation and use by at least 11 mammal species, including red fox, coyote, raccoon, woodchuck, and Virginia opossum. Coyotes and red foxes both exhibited scent-marking at the den …

Go to article

Evidence Of Personality And Movement Syndromes In A Mobile Predator: How Individual Hunting Strategy Shapes Ecosystem Service Potential By Barn Owls (Tyto Furcata) In An Agroecosystem, Lauren M. Jackson Jan 2026

Evidence Of Personality And Movement Syndromes In A Mobile Predator: How Individual Hunting Strategy Shapes Ecosystem Service Potential By Barn Owls (Tyto Furcata) In An Agroecosystem, Lauren M. Jackson

Cal Poly Humboldt theses and projects

Animal-mediated ecosystem services are delivered through the behavior of individuals, yet most studies evaluate service-providing species at the population level. We tested whether individual variation in plumage, behavior, and movement predicted hunting behavior and vineyard habitat use by adult male American barn owls (Tyto furcata) nesting in winegrape vineyards in Lodi, California, USA. We fitted GPS-accelerometer tags to 42 breeding males, quantified breast-plumage traits, measured neophobia using repeated novel object tests, and derived nightly movement metrics from GPS tracks and hidden Markov model-classified hunting locations. Several behavioral traits were repeatable, but movement traits showed the clearest repeatable individual …

Go to article

Sequestration Of Plant Defenses By Spotted Lanternfly (Lycorma Delicatula) And Effects On Avian Predators, Anne E. Johnson, Allison Cornell, Fang Zhu, Ashley E. Shay, Gabrielle Davis, Kelli Hoover Oct 2025

Sequestration Of Plant Defenses By Spotted Lanternfly (Lycorma Delicatula) And Effects On Avian Predators, Anne E. Johnson, Allison Cornell, Fang Zhu, Ashley E. Shay, Gabrielle Davis, Kelli Hoover

Biology Faculty Publications

Lycorma delicatula is a polyphagous phloem feeder, which is spreading rapidly in the U.S., and is a major threat to grapes, hops, and ornamentals. Among its hosts, L. delicatulaprefers Ailanthus altissima, an invasive tree from which it sequesters toxins, including several quassinoid compounds. We tested how these defenses affected predation by birds of nymphal and adult L. delicatula. Freeze-killed nymphs of each instar were reared with or without access to A. altissima and placed into cups on top of nest boxes occupied by house wrens (Troglodytes aedon). House wrens ate or fed their chicks a …

Go to article

Using Livestreaming Technology To Answer Novel Questions About The Behavior And Physiological Ecology Of The Prairie Rattlesnake (Crotalus Viridis), Max C. Roberts Aug 2025

Using Livestreaming Technology To Answer Novel Questions About The Behavior And Physiological Ecology Of The Prairie Rattlesnake (Crotalus Viridis), Max C. Roberts

Master's Theses

Recent advances in remote monitoring technology are opening up new opportunities for developing innovative natural history and biological research methodologies. In particular, the emergence of livestreaming camera technology has made recording remote video of wild and secretive animals much easier and made it possible to collect data at extremely fine temporal resolutions. In 2024, Project RattleCam launched a livestreaming camera at a Prairie Rattlesnake (Crotalus viridis) den in Colorado. The goal of this work was to study Prairie Rattlesnake behavior 24-7 throughout the species’ active season with minimal human disturbance. Additionally, I used this system to study the …

Go to article

Response Of Various Body Parts Of House Flies, Musca Domestica, To Sucrose, Panchalie B. Gunathunga, Merveille Muyizere, Bethia H. King Jul 2025

Response Of Various Body Parts Of House Flies, Musca Domestica, To Sucrose, Panchalie B. Gunathunga, Merveille Muyizere, Bethia H. King

Faculty Articles, Papers, and Other Scholarship

Insects use multiple body parts, not just their mouth, to taste. Whether a particular body part has a taste function can be determined by examining the morphology or electrophysiological response of its sensilla (sense organs) or by its behavioral response. The present study investigated taste response of each of the three pairs of tarsi, tibiae, femurs, as well as the antennae and wings, in house flies, Musca domestica L. (Diptera: Muscidae). This was done by measuring the proboscis extension response (PER), and in the case of the wings, also the grooming behavior. PER is a visible precursor to consumption. The …

Go to article

Field Observations Of Gopher Tortoise (Gopherus Polyphemus) Activity At A Rare Double-Burrow, James Carroll, Rachel Carroll Feb 2025

Field Observations Of Gopher Tortoise (Gopherus Polyphemus) Activity At A Rare Double-Burrow, James Carroll, Rachel Carroll

Georgia Journal of Science

After a review of the journal, it does not appear that abstracts are included with Research Notes. Therefore, no abstract is provided. However, we certainly defer to the Editors on this requirement and will happily provide an abstract if needed.

Go to article

Learning In Nonleafcutting Fungus-Gardening Ants, Elizabeth D. Boshers Jan 2025

Learning In Nonleafcutting Fungus-Gardening Ants, Elizabeth D. Boshers

Biology Theses

Social complexity influences learning and other cognitive behaviors, but for insects, this influence is not well understood. Delayed rejection is an aversive learning behavior previously studied exclusively in leafcutting ant species, the most socially complex of the fungus-gardening ants. Fungus-gardening ants are unique in that they do not directly consume the material they forage, using it instead as substrate to cultivate a symbiotic fungus on which the ants are obligately dependent. Here, I attempt to induce delayed rejection in several fungus-gardening ant species that exhibit a range of social complexity, then compare the characteristics of delayed rejection behavior among species. …

Go to article

If You Build It: Using Ground Squirrel Risk Perception To Test Wildlife Crossing Structure Success, Sarah Sanz Jan 2025

If You Build It: Using Ground Squirrel Risk Perception To Test Wildlife Crossing Structure Success, Sarah Sanz

All Master's Theses

Roads and traffic present many risks for wildlife, and animals must be able to accurately assess risks in their environment. Animals can often perceive the level of risk they face, and their behavioral responses can alter their fitness and potentially even whole-population dynamics. However, animals may be unable to properly measure the levels of risk near roadways because roads present novel environmental conditions and alter predators’ behavior. To mitigate some of the ecological problems created by roadways, wildlife crossing structures (WCSs) are being incorporated into transportation projects. To understand whether WCSs provide quality habitat for wildlife, we compared the levels …

Go to article

Investigating Social Attenuation Of The Stress Response In Juvenile Northern Cottonmouths (Agkistrodon Piscivorus), Alyssa Owens Jan 2025

Investigating Social Attenuation Of The Stress Response In Juvenile Northern Cottonmouths (Agkistrodon Piscivorus), Alyssa Owens

Graduate Theses/Dissertations

When social organisms encounter a stress-inducing event, the presence of a conspecific can dampen the physiological and/or behavioral response elicited by the stressor. This concept, termed ‘social buffering’, has been well documented in mammals, but there are few studies investigating this phenomenon in organisms traditionally perceived as asocial, including reptiles. However, the paradigm is shifting, and social behavior is now more widely recognized in reptiles, including snakes. In this study I tested whether juvenile Northern Cottonmouths (Agkistrodon piscivorous) experience social buffering by measuring changes in heart rate in snakes following an acute stressor with and without the presence …

Go to article

Use Of Public Information For Prospecting And Nest Site Selection By Western Bluebirds (Sialia Mexicana), Fatime Wadad Jomaa Jan 2025

Use Of Public Information For Prospecting And Nest Site Selection By Western Bluebirds (Sialia Mexicana), Fatime Wadad Jomaa

Cal Poly Humboldt theses and projects

Public information that provides an estimate of reproductive success, in addition to information gained through direct environmental sampling, may provide an efficient way for individuals to assess future breeding site quality. I investigated the hypothesis that prospecting Western Bluebirds (Sialia mexicana) use post-breeding public information to select nest sites the following year across winegrape vineyards in Napa Valley. In late summer of 2023, I installed 200 nest boxes across 10 vineyards without prior box history. To simulate conspecific presence and successful breeding, boxes within 5 experimental vineyards were designated either full-treatment (boxes directly broadcasting adult song and nestling …

Go to article

Repeated Shifts In Sociality Are Associated With Fine-Tuning Of Highly Conserved And Lineage-Specific Enhancers In A Socially Flexible Bee, Beryl M. Jones, Andrew E. Webb, Scott M. Geib, Sheina Sim, Rena M. Schweizer, Michael G. Branstetter, Jay D. Evans, Sarah D. Kocher Nov 2024

Repeated Shifts In Sociality Are Associated With Fine-Tuning Of Highly Conserved And Lineage-Specific Enhancers In A Socially Flexible Bee, Beryl M. Jones, Andrew E. Webb, Scott M. Geib, Sheina Sim, Rena M. Schweizer, Michael G. Branstetter, Jay D. Evans, Sarah D. Kocher

Entomology Faculty Publications

Comparative genomic studies of social insects suggest that changes in gene regulation are associated with evolutionary transitions in social behavior, but the activity of predicted regulatory regions has not been tested empirically. We used self-transcribing active regulatory region sequencing, a high-throughput enhancer discovery tool, to identify and measure the activity of enhancers in the socially variable sweat bee, Lasioglossum albipes. We identified over 36,000 enhancers in the L. albipes genome from 3 social and 3 solitary populations. Many enhancers were identified in only a subset of L. albipes populations, revealing rapid divergence in regulatory regions within this species. Population-specific enhancers …

Go to article

Effects Of Retinal Gonadotropin-Releasing Hormone On Reproductive Behavior And Retinal Activity In The Cichlid Fish, Astatotilapia Burtoni, Chase Anselmo Oct 2024

Effects Of Retinal Gonadotropin-Releasing Hormone On Reproductive Behavior And Retinal Activity In The Cichlid Fish, Astatotilapia Burtoni, Chase Anselmo

LSU Master's Theses

Many animals use visual signals to evade predators, forage for food, and communicate with conspecifics. Some animals that shift into and out of breeding stages, such as fish, can modulate their visual sensitivity to better adapt to changing internal and external conditions. Previous work in our lab demonstrated that females of the cichlid fish Astatotilapia burtoni have improved visual sensitivity when they enter reproductive readiness. However, little is known about how fish and vertebrates more broadly modulate visual sensitivity across their reproductive cycle. We hypothesized that the hormone and neuromodulator gonadotropin-releasing hormone (GnRH) could modulate visual sensitivity because GnRH is …

Go to article

Biology Of Aproida Balyi Pascoe, 1863 (Coleoptera: Chrysomelidae: Cassidinae: Aproidini) On Its Host Plant, Eustrephus Latifolius R. Br. Ex Ker-Gawl (Asparagaceae) In Australia, Caroline Simmrita Chaboo, Vivian E., Mariana Campos, Geoff B. Monteith Oct 2024

Biology Of Aproida Balyi Pascoe, 1863 (Coleoptera: Chrysomelidae: Cassidinae: Aproidini) On Its Host Plant, Eustrephus Latifolius R. Br. Ex Ker-Gawl (Asparagaceae) In Australia, Caroline Simmrita Chaboo, Vivian E., Mariana Campos, Geoff B. Monteith

Insecta Mundi

Within the leaf-beetle subfamily Cassidinae (Coleoptera: Chrysomelidae), Aproida Pascoe, 1863 (Aproidini) from Australia has been considered a transitional genus between mining cassidines (“hispines”) and exophagous cassidines (“tortoise beetles”). To illuminate this transition, a detailed study was conducted over one year of the biology of Aproida balyi Pascoe, 1863 on the host plant, Eustrephus latifolius R. Br. ex Ker-Gawl (Asparagaceae). Distribution maps of the host plant and three Aproida species are provided. The life cycle of A. balyi comprises single eggs in a foamy ootheca, three larval instars that feed openly, a pupa suspended from the larva III exuvia, and …

Go to article

Unraveling The Behavioral Ecology Of The Western Diamond-Backed Rattlesnake (Crotalus Atrox) Through The Lenses Of Personality, Predator-Prey Interactions, And Crypsis, Oceane Da Cunha Aug 2024

Unraveling The Behavioral Ecology Of The Western Diamond-Backed Rattlesnake (Crotalus Atrox) Through The Lenses Of Personality, Predator-Prey Interactions, And Crypsis, Oceane Da Cunha

Open Access Theses & Dissertations

To thrive in an environment, individuals need to be able to forage efficiently and acquire mates. These resources are limited, and their acquisition depends upon the energy and time an individual chooses to allocate to each activity and the environmental conditions, leading to behavioral trade-offs. Different species, or even different individuals within the same population, respond to these trade-offs by employing contrasting strategies, leading to differential life-history outcomes. The overarching goal of this dissertation is to gain a better understanding of the trade-offs cryptic ambush mesopredators are facing using the western diamond-backed rattlesnake (Crotalus atrox) as a model species. Each …

Go to article

Impacts Of Anthropogenic Disturbances And Urbanization On The Behavior And Morphology Of Two Free-Living Lizard Species (Uta Stansburiana And Aspidoscelis Neotesselatus), Layne O. Sermersheim Aug 2024

Impacts Of Anthropogenic Disturbances And Urbanization On The Behavior And Morphology Of Two Free-Living Lizard Species (Uta Stansburiana And Aspidoscelis Neotesselatus), Layne O. Sermersheim

All Graduate Theses and Dissertations, Fall 2023 to Present

Urbanization can alter wildlife, requiring species to adjust to anthropogenic changes via life history strategies. Reptiles are particularly vulnerable to these changes, as ectotherms directly rely on their environment to maintain their optimal homeostatic state. As urbanization changes the landscape, reptiles will have to adapt to anthropogenic change, but it is unclear what behaviors may be aiding in this adaptation and whether there are morphological tradeoffs existing to support this change. To analyze the impact of urbanization and anthropogenic disturbances on reptile behavior and morphology, I conducted three research studies on two different species – the common side-blotched lizard and …

Go to article

Antimicrobials Produced By Ants: Chemical Properties And Microbe Specificity, Katy Chon Jul 2024

Antimicrobials Produced By Ants: Chemical Properties And Microbe Specificity, Katy Chon

Master's Theses

Antibiotic resistance is a growing public health concern worldwide, and for over a decade, we have been witnessing the growth of difficult to treat infectious diseases caused by bacteria that are becoming resistant to antibiotics. This resistance can be mostly related to the misusing and improper use of antibiotics in both humans and animals. To restore this problem, humans have turned to new sources for the production of antibiotics. In this study, we focused on using ants. Social insects, including ants and bees, have faced strong disease pressures during their evolution and have developed a range of methods to fight …

Go to article

Wildlife Conservation: The Importance Of Individual Personality Traits And Sentience, Karen A. Owens, Gosia Bryja, Marc Bekoff Jul 2024

Wildlife Conservation: The Importance Of Individual Personality Traits And Sentience, Karen A. Owens, Gosia Bryja, Marc Bekoff

Animal Sentience

Individual differences in personality types within the same species have been studied much less than differences between species and populations. Personality differences are related to risk-taking and exploration, which in turn correlate with individuals' daily responses, decisions, and fitness. Bold and shy personality types can have different advantages and disadvantages under different social or environmental pressures. Analyzing personality differences has helped clarify how elk habituate to a well-populated area and how management strategies can be adapted to them. For wolves newly repatriated to Colorado, individual personality factors are likely to prove important for adapting to their new homes as well …

Go to article

Analysis Of Social Behavior Of The African Great Apes During Feeding And Non-Feeding Contexts, Jessica Hale May 2024

Analysis Of Social Behavior Of The African Great Apes During Feeding And Non-Feeding Contexts, Jessica Hale

Master's Theses

The three African great apes, bonobos, chimpanzees and gorillas, despite similar habitats, differ considerably in their sociality and feeding ecology. There have been many studies that have investigated the feeding ecology and social behaviors of these species, but there is extremely limited literature available on how feeding ecology may have affected ape social evolution. Chimpanzees are frugivorous, which forces them into close proximity when foraging given the clumped nature of this resource. Bonobos and gorillas, however, are fallback food consumers, which allow them to spread out as they forage. This thesis project aims to test the hypothesis that differences in …

Go to article

Analyzing Phototaxis And Related Visual Behaviors Among Diverse Species Of Drosophila, Madeline M. Hill May 2024

Analyzing Phototaxis And Related Visual Behaviors Among Diverse Species Of Drosophila, Madeline M. Hill

Honors Program: Senior Projects (Public)

Phototaxis and related visual behaviors can vary between species, and thus members of the genus Drosophila make an excellent study system to examine the evolution of vision. While some existing research points to these phototactic behaviors arising due to mating requirements or due to their species-specific ecology or environmental factors, there exists a lack of understanding as to why striking behavioral differences can exist between closely related species, or between members belonging to the same genus. The present research seeks to uncover the specifics regarding these discrepancies in visual evolution and aims to provide a foundation of knowledge about visual …

Go to article

Does Behavior Evolve First? Correlated Responses To Selection For Voluntary Wheel-Running Behavior In House Mice, Rahim H. Khan, Justin S. Rhodes, Isabelle A. Girard, Nicole E. Schwartz, Theodore Garland Jr. Apr 2024

Does Behavior Evolve First? Correlated Responses To Selection For Voluntary Wheel-Running Behavior In House Mice, Rahim H. Khan, Justin S. Rhodes, Isabelle A. Girard, Nicole E. Schwartz, Theodore Garland Jr.

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

How traits at multiple levels of biological organization evolve in a correlated fashion in response to directional selection is poorly understood, but two popular models are the very general “behavior evolves first” (BEF) hypothesis and the more specific “morphology-performance-behavior-fitness” (MPBF) paradigm. Both acknowledge that selection often acts relatively directly on behavior and that when behavior evolves, other traits will as well but most with some lag. However, this proposition is exceedingly difficult to test in nature. Therefore, we studied correlated responses in the high-runner (HR) mouse selection experiment, in which four replicate lines have been bred for voluntary wheel-running behavior …

Go to article

Rock Hyrax: A Study Of Hyrax Energy Budget And Behavior Near Randilen Wildlife Management Area, Tanzania, Alice Thompson Apr 2024

Rock Hyrax: A Study Of Hyrax Energy Budget And Behavior Near Randilen Wildlife Management Area, Tanzania, Alice Thompson

Independent Study Project (ISP) Collection

Conducted at the gate of Randilen Wildlife Management Area (WMA), the purpose of this study was to contribute knowledge regarding rock hyraxes (Procavia capensis) through studying their energy budget and behavior. Rock hyraxes are small mammals belonging to the order hyracoidea. Despite being abundant across most of the African continent and parts of the Middle East, these herbivorous animals remain understudied in Tanzania. During the wet season of spring 2024, a total of 70 hours was applied to this research over the course of 10 days (April 7th to April 16th) using both qualitative and quantitative methods. The …

Go to article

Ms Environmental Biology Capstone Project, Reilly Miller Jan 2024

Ms Environmental Biology Capstone Project, Reilly Miller

Regis University Student Publications (comprehensive collection)

Habitat loss due to deforestation is a primary threat to global biodiversity. Clearing tropical rainforests for agriculture leads to forest fragmentation. Forest fragments contain fewer large trees and provide lower food availability for primates compared to continuous forests. Mantled howler monkeys inhabit the increasingly fragmented rainforests of Central and South America and may need to alter their activity and spatial cohesion to mitigate competition and preserve energy in fragments where there is lower quality food. We compared howler monkey activity and spatial cohesion across a small forest fragment (La Suerte Biological Research Station, LSBRS) and a large, continuous forest (La …

Go to article

Chronic Wasting Disease Effects On A Breeding Season Behavior In White-Tailed Deer (Odocoileus Virginianus), Miranda Hsiang-Ning Jacobson Huang, Stephen Demarais, Bronson K. Strickland, Allan Houston, Alejandro Banda, Kurt C. Vercauteren Jan 2024

Chronic Wasting Disease Effects On A Breeding Season Behavior In White-Tailed Deer (Odocoileus Virginianus), Miranda Hsiang-Ning Jacobson Huang, Stephen Demarais, Bronson K. Strickland, Allan Houston, Alejandro Banda, Kurt C. Vercauteren

United States Department of Agriculture Wildlife Services: Staff Publications

Wildlife disease outbreaks can lead to population declines, which are usually attributed to increased direct or indirect mortality. Alternatively, behavior associated with sickness can lead to social isolation, potentially decreasing fitness of affected individuals. A useful case study to examine this dynamic is chronic wasting disease (CWD), a neurological disease of cervids, known to affect behavior and movement. In this study, we monitored scraping, a White-tailed Deer (Odocoileus virginianus; WTD) breeding season behavior, in an area of high CWD prevalence to determine if this reproductive behavior is affected by CWD. At 107 scrape sites, we detected 3,063 scrape interactions and …

Go to article

Exploring Ecological Drivers Of Evolution Of The Brain, Cognition, And Behavior, Meghan Korte Jan 2024

Exploring Ecological Drivers Of Evolution Of The Brain, Cognition, And Behavior, Meghan Korte

Biology Dissertations - Archive

Evolutionary theory proposes that increases in brain size confer cognitive and behavioral benefits that offset the expensive investment in brain tissue. However, few studies have examined the relationship between brain size, cognition, and behavior within species. The majority of research has focused on cross-species comparisons, thus there is a need for empirical research within species examining how contrasting ecological pressures select for cognitive and behavioral benefits and how these may evolve in tandem with changes in brain size. My dissertation addresses this gap by examining: 1) Whether selection on brain size is linked to improvements in cognitive ability; 2) How …

Go to article

Examining The Drivers Of Nocturnal Behavior Of Pikas At Lower Elevations In Lassen National Forest, California, Evan Burnett Jan 2024

Examining The Drivers Of Nocturnal Behavior Of Pikas At Lower Elevations In Lassen National Forest, California, Evan Burnett

Cal Poly Humboldt theses and projects

The American pika (Ochotona princeps) is a charismatic mammal species adapted to occupy rockslides and boulder fields in western North America. Historically monitored due to their climate sensitivity, pikas have experienced extirpations along their lower range margins—driven by chronic and acute temperature stress—prompting increased concern and monitoring over the risks posed by anthropogenic climate change. Traditionally considered an alpine species, pikas occupy a wide range of elevations, with those at lower elevations exhibiting higher rates of nocturnality than their counterparts at higher elevations. Temperature is hypothesized to be the driver, but this has yet to be confirmed. Pikas …

Go to article

The Effect Of Light Intensity On Wolf Spider Foraging, Julia Amoroso Jan 2024

The Effect Of Light Intensity On Wolf Spider Foraging, Julia Amoroso

Scripps Senior Theses

Light is of primary importance to most living organisms and most of the Earth’s natural processes. However, with rapidly expanding urbanization, humans have substantially impacted light metrics through the increase of artificial light. Artificial light pollution has been found to have a variety of behavioral and physiological effects on different organisms. However, less is understood about how light impacts community-scale interactions between different trophic levels. Here, we examined the influence of light exposure on nocturnal wolf spider (Schizocosa myccooki) foraging and interaction with red runner cockroach prey (Blatta lateralis). Of equal interest as the study …

Go to article

An Effective Method For Long-Term Control Of American Bullfrogs Syntopic With Special-Status Native Amphibians In California, Usa, Jeff A. Alvarez, Jeffery T. Wilcox Jan 2024

An Effective Method For Long-Term Control Of American Bullfrogs Syntopic With Special-Status Native Amphibians In California, Usa, Jeff A. Alvarez, Jeffery T. Wilcox

Human–Wildlife Interactions

American bullfrogs (Lithobates catesbeianus) are invasive in western North America and are well established in California, USA, where they are widespread. This invasive species has been implicated in the decrease of native amphibian populations and is believed to have contributed to the decline of threatened and endangered amphibians regionally. We utilized air rifles, tin alloy pellets, and 2 shooters to systematically control L. catesbeianus in both lentic and lotic habitat types within 2 counties in California. We visited sites monthly (April through November) for approximately 8 and 14 years to lethally target and remove L. catesbeianus …

Go to article

Next Last