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Articles 1051 - 1080 of 19750

Full-Text Articles in Ecology and Evolutionary Biology

Aquatic Invertebrate Populations In Roadside Wetlands In Relation To Water Characteristics, Ellen P. Isakson Jan 2025

Aquatic Invertebrate Populations In Roadside Wetlands In Relation To Water Characteristics, Ellen P. Isakson

Journal of Earth and Life Science

The continual habitat destruction and draining of wetland systems makes the need to understand the ecology of roadside wetlands all the more necessary. Roadside wetlands provide valuable habitat to countless aquatic invertebrates, which can provide insight into the health of the wetland system due to their diversity. The objective of this study was to analyze the populations of aquatic invertebrates in roadside wetlands in relation to water characteristics such as pH, salinity, conductivity, water depth and temperature, and dissolved oxygen. This was done by collecting samples of invertebrate populations from roadside wetlands, in addition to data on water quality characteristics …

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Diversification Of Avifauna In The Darién Highland Region: Ecological Niche Modeling, Phylogeography And Morphology To Explore Speciation In The Montane Species Myadestes Coloratus, Chlorospingus Tacarcunae And Margarornis Bellulus., Jorge L. Garzon Vasquez Mrs Jan 2025

Diversification Of Avifauna In The Darién Highland Region: Ecological Niche Modeling, Phylogeography And Morphology To Explore Speciation In The Montane Species Myadestes Coloratus, Chlorospingus Tacarcunae And Margarornis Bellulus., Jorge L. Garzon Vasquez Mrs

Theses and Dissertations

Montane regions in the Neotropics are hotspots of endemism and biodiversity, yet their species are especially vulnerable to the impacts of climate change and geographic isolation. This thesis investigates the evolutionary and ecological dynamics of three bird species endemic to the Darién Highlands of eastern Panama: Myadestes coloratus, Chlorospingus tacarcunae, and Margarornis bellulus. Through an integrative approach combining ecological niche modeling, morphometric analysis, and genomic data from ultraconserved elements (UCEs) and mitochondrial DNA, the study explores the historical biogeography, current distribution patterns, population structure, and phenotypic differentiation of these montane taxa. Ecological niche models revealed that suitable habitat …

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Critical Environmental Communication Framework, Shumaila J. Bhatti, Srivi Ramasubramanian, Andrea Feldpausch-Parker, Bruno Takahashi, Silje Kristiansen Jan 2025

Critical Environmental Communication Framework, Shumaila J. Bhatti, Srivi Ramasubramanian, Andrea Feldpausch-Parker, Bruno Takahashi, Silje Kristiansen

Media Studies - All Scholarship

This study develops a Critical Environmental Communication (CEC) framework to assess the landscape of Environmental Communication research and to what extent and in which ways critical and justice-oriented perspectives are included. The CEC framework consists of four interconnected themes: (a) Marginalized Ecocultural Identities, (b) Context and Scale, (c) Power and Agency, and (d) Justice, Equity, Diversity, Access, and Inclusion (JEDAI). Using this framework in a bibliometric analysis examining 1,297 Environmental Communication publications, we assess the occurrence of these themes in the scholarship. Our analysis found that Marginalized Ecocultural Identities, and Context and Scale were most frequently occurring, while Power and …

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Jaguar (Panthera Onca) Population Status And Conservation Needs In Panama Revealed Using Spatial Density And Occupancy Models., Rebeca E. Becdach Jan 2025

Jaguar (Panthera Onca) Population Status And Conservation Needs In Panama Revealed Using Spatial Density And Occupancy Models., Rebeca E. Becdach

Cal Poly Humboldt theses and projects

Jaguars (Panthera onca) are key predators and the largest felid in the Americas. The species is listed as near threatened globally due to habitat loss, fragmentation, and human persecution. Their population decline can negatively affect the structure and functioning of the ecosystems they inhabit. Conservation efforts for jaguars and their habitat require understanding jaguar populations and how they are impacted by human presence across their range. This information is lacking in Panama, a critical portion of the Jaguar range. Panama forms a narrow land bridge connecting Central and South America, integral to wildlife movement, including jaguars, across both …

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Associational Seaweed Defense Reduces Sea Urchin Grazing On Bull Kelp: Potential Use In Restoration, Brayden Tate Wiley Jan 2025

Associational Seaweed Defense Reduces Sea Urchin Grazing On Bull Kelp: Potential Use In Restoration, Brayden Tate Wiley

Cal Poly Humboldt theses and projects

Kelp forests are declining globally under warming seas, altered predator–prey dynamics, and intensified herbivory, with sea urchins often driving shifts from canopy-dominated forests to persistent urchin barrens. Management commonly relies on labor-intensive urchin removals, with variable success, underscoring the need for complementary, ecosystem-based tools that directly reduce urchin grazing pressure. Focusing on far northern California kelp forests, we combined subtidal surveys, field experiments, and laboratory feeding assays to assess whether the understory alga Desmarestia cf. herbacea can provide associational defense for bull kelp (Nereocystis luetkeana) by physically deterring purple sea urchin (Strongylocentrotus purpuratus) grazing and offering low …

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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 …

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The Chesapeake Pearl: A Proposal For An Environmental Public Art Installation, Samuel I. Reichard Jan 2025

The Chesapeake Pearl: A Proposal For An Environmental Public Art Installation, Samuel I. Reichard

Pitzer Senior Theses

In this thesis, I lay the foundation for an environmental art project along Chesapeake Bay. It includes an analysis of relevant literature and case studies, as well as a proposal for the project. The Chesapeake Pearl (working title) would be a 20-foot spherical aquarium that will visually display the water filtration capacity of eastern oysters and native seagrass, aiming to inspire curiosity around these organisms and the greater Chesapeake Bay ecosystem. The project exists at the intersection of environmental art and environmental education and seeks to promote learning and public engagement through visually demonstrating a scientific process, the water filtration …

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Effects Of Direct And Indirect Predator Cue Intensity On Foraging Decisions In A Deer Mouse, Peromyscus, Nicholas G. Levinson Jan 2025

Effects Of Direct And Indirect Predator Cue Intensity On Foraging Decisions In A Deer Mouse, Peromyscus, Nicholas G. Levinson

Honors Theses

Ecologists developed optimal foraging theory as a framework to understand how an animal may spend minimal time to maximize resource intake. A giving-up density (GUD) is a metric of the density of remaining food in a food patch at which an animal decides foraging is no longer economical. This study aims to test how the intensity of direct and indirect predator cues alter foraging patterns of deer mice. To measure GUD, I used depletable food patches deployed in the “upper woods” on the periphery of Colby College. To simulate direct predator cues, 1 mL of fox urine was applied on …

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Are There Predictable Shifts In Fish Communities Following Instream Habitat Restoration? A Multistream Analysis., Ryan A. Skowronski Jan 2025

Are There Predictable Shifts In Fish Communities Following Instream Habitat Restoration? A Multistream Analysis., Ryan A. Skowronski

Masters Theses

In the past two centuries, anthropogenic stressors have degraded the structure and function of streams by accelerating bank erosion, decreasing riparian buffer zones, and altering the natural flow regime. Habitat restoration has become a common mitigation strategy in response to stream degradation, though empirical research evaluating its effectiveness is lacking in the United States. This study investigated responses in fish community following habitat restoration in five restored, Illinois streams. We assigned fish species to habitat, trophic, and reproductive guilds based on their habitat preferences, feeding habits, and life history. Streams were separated into enhancement and removal groups for analysis. Shifts …

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Parasite Communities Of Bluntnose Minnow (Pimephales Notatus) From Several Creeks In East Central Illinois, Md Rowshan Alam Jan 2025

Parasite Communities Of Bluntnose Minnow (Pimephales Notatus) From Several Creeks In East Central Illinois, Md Rowshan Alam

Masters Theses

Parasites of freshwater fish play a vital functional role in aquatic ecosystems, but the spatial and ecological determinants of their prevalence and characteristics are still poorly understood. The current study quantified the diversity, prevalence, and environmental determinants of whole parasite burdens in bluntnose minnows across multiple creeks in central Illinois. Fish sampling and the collection of stream habitat data were conducted during the summers of 2023 and 2024. Fish were examined for parasites using necropsy and histology. A total of 20,817 parasites, predominantly trematodes (Posthodiplostomum spp.), cestodes (Proteocephalus spp), and protozoans, were identified. The most prevalent and abundant …

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Habitat Use And Selection Of Silver Carp In The Lower Wabash River System, Coy B. Blair Jan 2025

Habitat Use And Selection Of Silver Carp In The Lower Wabash River System, Coy B. Blair

Masters Theses

The spatial ecology of non-native species in invaded systems remains relatively poorly understood despite the importance of suitable habitat in the success of invasion. Silver Carp Hypophthalmichthys molitrix are a highly invasive non-native species with established populations throughout the Midwestern United States. Much research has focused on habitat use of bigheaded carp in large river systems, though invasion risk remains high in smaller systems, such as tributaries of the Great Lakes and the Ohio River. The Wabash River, a unique system in the Midwest, remains largely un-impounded and is comparable to many of the smaller riverine systems at risk of …

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Giant Cane (Arundinaria Gigantea) And The Swainson’S Warbler (Limnothlypis Swainsonii): Implementing Innovative Monitoring Techniques For Species Of Conservation Concern, Gabriela Carroll Jan 2025

Giant Cane (Arundinaria Gigantea) And The Swainson’S Warbler (Limnothlypis Swainsonii): Implementing Innovative Monitoring Techniques For Species Of Conservation Concern, Gabriela Carroll

Graduate Theses/Dissertations

In the U.S., following colonization and agricultural expansion, giant cane (Arundinaria gigantea) has been reduced to approximately 2% of its original extent, potentially causing shifts in the abundance and distribution of over 70 associated animal species. Among those species is the Swainson’s Warbler (Limnothlypis swainsonii), which has been known to occupy canebrakes during the breeding season. Though there is little known about the historical range of the Swainson’s Warbler and its current population status, some have hypothesized that its population may have declined due to the reduction of its suitable breeding habitat. As this species is …

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Tailwater Trout Population Dynamics, Connor Dylan Cunningham Jan 2025

Tailwater Trout Population Dynamics, Connor Dylan Cunningham

Graduate Theses/Dissertations

Dams have been constructed throughout the world and provide several resources for humans (e.g., flood control, hydropower). These structures heavily alter the upstream and downstream environment. One consequence of these alterations is the creation of “tailwaters”, which can create cold-water habitat via hypolimnetic releases. In the southeast United States these tailwater environments are often managed for the recreational use of nonnative salmonids. The unnatural flow regimes of tailwaters affect the biotic and abiotic conditions and ultimately the dynamic rate functions (i.e., recruitment, growth, mortality) of the fish inhabiting them. As such, the goal of this research is to provide fisheries …

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Activity, Movement, And Reproductive Patterns Of The Northern Giant Musk Turtle (Staurotypus Triporcatus) In Belize, Larissa Sage Saarel Jan 2025

Activity, Movement, And Reproductive Patterns Of The Northern Giant Musk Turtle (Staurotypus Triporcatus) In Belize, Larissa Sage Saarel

Graduate Theses/Dissertations

The Northern Giant Musk Turtle (Staurotypus triporcatus), a near-threatened species native to southern Mexico, Guatemala, Belize, and western Honduras, faces multiple environmental challenges, yet its activity patterns, movement patterns, and reproductive biology remain poorly understood. This thesis investigates both seasonal activity and reproductive cycles of female S. triporcatus in Belize. To assess diel and seasonal activity, I tracked 12 female turtles and collected data using activity loggers. I also collected movement data through radio-telemetry and acoustic tracking methods. Results indicated that the species is primarily nocturnal, with increased activity during the wet season, particularly during flooding events. Turtles …

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Responses Of Native And Invasive Aquatic Vegetation To Changes In Water Depth In An Ozark Spring-Fed Pond, Daphne Miles Jan 2025

Responses Of Native And Invasive Aquatic Vegetation To Changes In Water Depth In An Ozark Spring-Fed Pond, Daphne Miles

Graduate Theses/Dissertations

Spring-fed aquatic ecosystems in the Ozark Highlands are characterized by stable water depths, clear water, and diverse aquatic vegetation (filamentous algae, submerged, floating, and emergent plants). Sudden changes in water depth can impact aquatic vegetation dynamics but the impacts of prolonged changes are poorly understood. I investigated seasonal and annual changes to aquatic vegetation abundance in a spring impoundment during and after a two-year period of low water depth that was caused by a broken outlet below an artificial dam. Water depth was significantly lower in 2020 and 2021 (low water years), compared to 2022 and 2023 (high water years). …

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History, Annotated Gazetteer, And Bibliography Of Ornithology In Kalimantan, Indonesian Borneo, Frederick H. Sheldon, Mohammad Irham, Daisy G. S. Kho, Erik Meijaard, Subir B. Shakya, Dewi M. Prawiradilaga, Sebastianus (Bas) Van Balen Jan 2025

History, Annotated Gazetteer, And Bibliography Of Ornithology In Kalimantan, Indonesian Borneo, Frederick H. Sheldon, Mohammad Irham, Daisy G. S. Kho, Erik Meijaard, Subir B. Shakya, Dewi M. Prawiradilaga, Sebastianus (Bas) Van Balen

Occasional Papers of the Museum of Natural Science, Louisiana State University

Kalimantan comprises nearly three quarters of the island of Borneo and is the place where scientific study of Bornean birds began. We describe the history of bird research in Kalimantan from its beginning, highlighting the ornithologists who explored the region and how their interests and methods changed over time, from a concentration on specimen collection, to examinations of community ecology, to conservation in the face of habitat change and species depletion, to the latest investigations using satellite, genetic, and digital technology. We also highlight some future directions for research, especially the need for more work on basic ecology and biogeography. …

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Louisiana Graduate Network In Applied Evolution (Lagniappe): 2024-2025 End-Year Report, Kristina G. Little, Samuel B. Robison, Bret Blackmon Jan 2025

Louisiana Graduate Network In Applied Evolution (Lagniappe): 2024-2025 End-Year Report, Kristina G. Little, Samuel B. Robison, Bret Blackmon

Reports

The Louisiana Graduate Network in Applied Evolution (LAGNiAppE) is a post-baccalaureate program funded by the National Science Foundation (NSF) and hosted by the LSU Department of Biological Sciences. In its second year, the program provides recent college graduates with a structured, immersive research experience designed to prepare them for graduate education and careers in STEM. This report presents findings from the 2024–2025 program year (cohort 2) and is based on comprehensive evaluation data collected from Scholars, mentors, and co-mentors. The 2024–2025 cohort engaged in a wide range of activities, including intensive bootcamp training, independent research projects, scientific presentations, weekly seminars, …

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Potential Of Using Trembling Aspen To Make Structural Engineered Wood Products, Dawei Wang Jan 2025

Potential Of Using Trembling Aspen To Make Structural Engineered Wood Products, Dawei Wang

Aspen Bibliography

Trembling aspen (Populus tremuloides) is abundant in Canada but is widely considered an underutilized species. This study was aimed at evaluating the potential of using aspen lumber to produce cross-laminated timber (CLT), glued-laminated timber (glulam), and wood I-joists. The key mechanical properties of these engineered wood products, which were fabricated using a modified grading criterion, were examined. It was found that 1) The mean effective bending stiffness and characteristic bending moment resistance of 5-layer CLT specimens in the major-strength direction were 5,069x109 N·mm2/m and 97.65x106 N·mm/m; 2) The mean apparent MOE and characteristic modulus …

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The Future Of Shipping At The Biodiversity-Climate Nexus : Round Table Report, Mary S. Wisz, Fabio Berzaghi, Mikaela Gomez, Maud C. Quinzin, Renis Auma Ojwala, Emily Nuckolls Jan 2025

The Future Of Shipping At The Biodiversity-Climate Nexus : Round Table Report, Mary S. Wisz, Fabio Berzaghi, Mikaela Gomez, Maud C. Quinzin, Renis Auma Ojwala, Emily Nuckolls

Reports

This report presents the outcomes of a cross-disciplinary Round Table hosted by the World Maritime University (WMU) from May 13-15, 2024, in Malmö, Sweden. The event brought together 51 experts from academia, industry, NGOs, and international organizations, including the IMO, to explore shipping’s role at the biodiversity-climate nexus. The Round Table had a particular focus on the impacts of shipping that are currently unregulated or under-regulated, and opportunities to address biodiversity loss and pollution as the sector decarbonizes. The report highlights the need to apply comprehensive, ecosystem-based approaches to effectively manage shipping's impacts, including cumulative impacts, on the environment, people, …

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Bioremediation In The Chesapeake Bay: Anthropogenic Ocean Acidification Mitigation In An Interactive Multi-Trophic Ecosystem, Cree Taylor Jan 2025

Bioremediation In The Chesapeake Bay: Anthropogenic Ocean Acidification Mitigation In An Interactive Multi-Trophic Ecosystem, Cree Taylor

AUCTUS: The Journal of Undergraduate Research and Creative Scholarship

Zostera marina is a species of marine macrophyte that has been largely prioritized in past submerged aquatic vegetation (SAV) restoration initiatives within the Chesapeake Bay because of its 1) previous abundance, 2) demonstrated carbon burial abilities, and 3) observed ability for meadows of Z. marina to ameliorate low pH conditions. Due to the temperature variability and poor water quality in the Chesapeake Bay, Z. Marina beds have experienced several die-off events with limited capacity for regrowth. Ruppia maritima, an opportunistic species with tolerance to temperature shifts within the bay, may have the potential to maintain SAV coverage in areas …

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Rejuvra's Effect On Soil Seed Banks, Blake J. Roeslein, Bryan Endress, Abby Mcmurtry, Akasha Faist Jan 2025

Rejuvra's Effect On Soil Seed Banks, Blake J. Roeslein, Bryan Endress, Abby Mcmurtry, Akasha Faist

Undergraduate Theses, Professional Papers, and Capstone Artifacts

Invasive annual grasses are a major driver of grassland degradation globally. In perennial grasslands, invasion can heavily impact biodiversity, including potential changes to the soil seed banks. Seed banks, the living seeds stored in the upper soil column, play an important role in healthy systems, or can harbor invasive species. To reduce negative invasion outcomes, whether in the seed bank, or aboveground vegetation, pre-emergent herbicides are a commonly used tool for land managers. Pre-emergent herbicides work by targeting seeds as they germinate and begin emerging from the soil. Thus, our study asks 1) how does pre-emergent herbicide influence germination and …

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If You Give A Tadpole A Chemosensory Stimulus: Detection Of Invasive Predatory Cues And Signs Of Conspecific Communication In Pseudacris Sierra Tadpoles, Faben Tesfazion Jan 2025

If You Give A Tadpole A Chemosensory Stimulus: Detection Of Invasive Predatory Cues And Signs Of Conspecific Communication In Pseudacris Sierra Tadpoles, Faben Tesfazion

Scripps Senior Theses

Amphibians are at disproportionately higher risks of extinction than all other vertebrate classes, and a major causing factor is invasive predation. The American bullfrog (Lithobates catesbeianus), native to Eastern North America, is a notorious invasive species which preys on native Sierran treefrogs (Pseudacris sierra) in Northern and Central California. These treefrogs have yet to be placed on any Special Animals List, suggesting the presence of adopted behaviors against predation. Past studies have documented the importance of chemical sensing in anuran tadpoles as predator detection tools. This study tests if Sierran treefrog tadpoles can recognize invasive chemical …

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Physiological Responses And Plant Trait Interactions With Coastal Dune And Swale Development, Emily C. Riffe Jan 2025

Physiological Responses And Plant Trait Interactions With Coastal Dune And Swale Development, Emily C. Riffe

Theses and Dissertations

Vegetation is crucial to coastal ecosystems experiencing climate change and storm-induced disturbance. Plant species interact with the physical environment and are considered “ecosystem engineers.” Sand dunes and barrier islands are at the forefront of climate change impacts as they are barriers that protect landward habitat and communities. Nature based solutions are utilized to protect infrastructure on developed coastlines. Understanding how dominant plant species interact with and alter the physical environment enhances our understanding of the mechanisms of change and consequences to the system. The goal of this research was to quantify physiological and functional trait differences in dominant species found …

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Noaa Oceanic And Atmospheric Research Ocean Carbon Observing Science Plan Fy25 To Fy35, United States National Oceanographic And Atmospheric Administration Jan 2025

Noaa Oceanic And Atmospheric Research Ocean Carbon Observing Science Plan Fy25 To Fy35, United States National Oceanographic And Atmospheric Administration

National Oceanographic and Atmospheric Administration: Technical Reports and Related Materials

United States National Oceanographic and Atmospheric Administration oceanic and atmospheric research ocean carbon observing science plan for fiscal years 2025 through 2035.

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Using Rna Sequencing To Examine Encephalic Gene Expression In Cactus Mice, Sarah A. Nicholls Jan 2025

Using Rna Sequencing To Examine Encephalic Gene Expression In Cactus Mice, Sarah A. Nicholls

Honors Theses and Capstones

Many of the exact mechanisms by which desert-adapted animals avoid dehydration-induced complications are unknown, though there are likely ties to the general mammalian dehydration response, a multisystem process spearheaded by the brain. Peromyscus eremicus, the cactus mouse, can survive its whole life without intaking water and is commonly used as a model to study desert adaptations. In this study, we have used bulk transcriptomics to characterize the differential gene expression across hydrated and dehydrated P. eremicus in five major regions of the brain: the cerebral cortex (referred to throughout much of this paper as the cortex), hippocampus, thalamus, midbrain, …

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Spatial Implications Of Potential Treeline Campfire Restrictions In Selected Usfs-Managed Colorado Wildernesses, Rebecca Hippensteel Jan 2025

Spatial Implications Of Potential Treeline Campfire Restrictions In Selected Usfs-Managed Colorado Wildernesses, Rebecca Hippensteel

Masters Projects

High-elevation ecosystems in Colorado’s Wilderness areas are ecologically sensitive and particularly vulnerable to campfire impacts, which can damage vegetation, alter soil chemistry, and degrade wilderness character. This study presents a preliminary proof of concept evaluating the spatial implications of banning campfires at or above 11,000 feet—used here as a proxy for treeline—in twelve U.S. Forest Service-managed Wilderness areas. Using 30-meter resolution Digital Elevation Models from the USGS National Map and Earth Explorer, a raster-based analysis in ArcGIS Pro identified and quantified acreage above 11,000 feet. Across the twelve Wilderness areas, 268,601 acres were found to lie above treeline, representing an …

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Wasting Disease Of A Marine Foundation Species Links Community Interactions To Disease Dynamics, Lillian R. Aoki, Olivia J. Graham, Reyn M. Yoshioka, Rebecca Maher, Lindsay Alma, Eileen E. Hofmann, Colleen A. Burge, Drew Harvell, Maya L. Groner Jan 2025

Wasting Disease Of A Marine Foundation Species Links Community Interactions To Disease Dynamics, Lillian R. Aoki, Olivia J. Graham, Reyn M. Yoshioka, Rebecca Maher, Lindsay Alma, Eileen E. Hofmann, Colleen A. Burge, Drew Harvell, Maya L. Groner

CCPO Publications

Infectious disease plays a key role in shaping marine communities, including in seagrass meadows, which form biodiverse coastal habitats. Eelgrass (Zostera marina) is the most widespread seagrass species and is susceptible to seagrass wasting disease, caused by the protist Labyrinthula zosterae. As a foundation species, eelgrass strongly influences ecosystem structure, function and services; recent work has begun to explore the links between critical community interactions and seagrass wasting disease. Here, we highlight recent advances about how the eelgrass community regulates and responds to seagrass wasting disease, from the microbiome to herbivores and filter feeders. We further show …

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The Theory Of Evolution, Alois Nicholas Wurst Jan 2025

The Theory Of Evolution, Alois Nicholas Wurst

Bachelors’ Theses

What is perhaps one of the most fascinating questions in the scientific and philosophical world today is the theory on the Decent of Man. We hear much concerning Evolution. New theories on the subject appear almost daily. Most of these seem to be hoaxes on the part of publicity hungry scientists. If a man would have his name in newspapers the world over, he must only say that he produced a living organism out of inanimate matter. Of course such a statement produces a sensation. But this sensation is short lived. Investigation usually exposes prevarication on the part of the …

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Interspecific Interactions And Resource Availability As Drivers Of Species Occurrences, Edita Folfas Jan 2025

Interspecific Interactions And Resource Availability As Drivers Of Species Occurrences, Edita Folfas

Biology Dissertations - Archive

Understanding what forces determine species occurrence is central to studies of community ecology. Species interact with each other and their environment, and these interactions scale up to shape global patterns of diversity. In my first chapter, I examined how predation might shape patterns of Anolis lizard species richness and abundance across landscapes on islands in the Greater Antilles. I quantified predatory bird occurrence by using thousands of observations from an online citizen science database (eBird). I then obtained estimates of anole abundance and diversity by conducting local field surveys and using mark-resight methods. While predators could negatively impact anole abundance …

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Is Mortality Of A Common Shrub A Heritable Trait? An Experimental Evaluation Of Senescence Using The Coast Willow, Salix Hookeriana., Maylin A. On, Rj Polyack, Sarah Galloway, Erik Jules Jan 2025

Is Mortality Of A Common Shrub A Heritable Trait? An Experimental Evaluation Of Senescence Using The Coast Willow, Salix Hookeriana., Maylin A. On, Rj Polyack, Sarah Galloway, Erik Jules

Undergraduate Scholarship

In 2009, a common garden study involving Salix hookeriana (called “willows” from hereon) was initiated in which multiple clonal replicates were created and propagated for a total of 675 trees. Since 2009, numerous experiments and observations have been completed using the willows at the study site of Humboldt Bay Wildlife Refuge demonstrating that growth, phenology, and insect communities are influenced by genotype. Our study was aimed at understanding if senescence and mortality are correlated with both plant sex and genotype. In August of 2024, seven replicates from each of the ten genotypes in the experimental array were selected and the …

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