Assessing A Half-Century Of Change In Understory Plant Range And Frequency In The Klamath Mountains Of California,
2026
Cal Poly Humboldt
Assessing A Half-Century Of Change In Understory Plant Range And Frequency In The Klamath Mountains Of California, Emily Jean Jackson
Cal Poly Humboldt theses and projects
The effects of climate change have and will continue to impact plant communities, including by potentially shifting species’ ranges towards topographically sheltered, cooler locations or higher elevations. In 2024, I resampled 140 vegetation plots established in 1969 in the Klamath Mountains of Northern California to assess range shifts of 46 understory species over a 55-year period. During this time, the elevational distribution of all species has increased significantly by an average of 26.9 m, but this increase was slower than necessary to track historic temperature niches given regional warming (215-311 m). Despite this overall increase, only four species exhibited significant …
Contents,
2026
University of Arkansas, Fayetteville
Contents, Discovery Editors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 27 2026,
2026
University of Arkansas, Fayetteville
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 27 2026, Several Authors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Soil Nutrient Sufficiency Versus Plant Nutrient Status In Compost-Amended Soils: Plant Tissue Analysis As A Diagnostic Tool,
2026
Murray State University
Soil Nutrient Sufficiency Versus Plant Nutrient Status In Compost-Amended Soils: Plant Tissue Analysis As A Diagnostic Tool, Chandralekha Joga Miss
Murray State Theses and Dissertations
This study evaluated whether Mehlich III soil nutrient sufficiency ratings reliably predict plant nutrient status and chlorophyll response across contrasting compost application histories. A greenhouse pot experiment was conducted with Chijimisai (Brassica rapa) planted in three treatment soils that had no compost (T1), moderate compost history (T2), and long-term hog manure compost application (T3). Plant performance was assessed through weekly shoot length and chlorophyll content (SPAD) measurements, leaf number at maturity, and leaf tissue nutrient analysis conducted at harvest. Soil test results indicated adequate to high nutrient levels across all three treatments. Leaf tissue analysis, however, revealed substantial …
Depth And Soil Physical Context Govern Soil Organic Carbon, While Woody Cover Moderates Native Vegetation Relationships In California Rangelands,
2026
Cal Poly Humboldt
Depth And Soil Physical Context Govern Soil Organic Carbon, While Woody Cover Moderates Native Vegetation Relationships In California Rangelands, Dabid Zuniga Garcia
Cal Poly Humboldt theses and projects
Soil organic carbon (SOC) is central to soil function and an important component of climate mitigation in rangeland ecosystems, but the controls on SOC across California’s working rangelands remain understudied. Using data from Point Blue Conservation Science’s Rangeland Monitoring Network, this study evaluated how soil properties, vegetation structure, and recent climate relate to SOC concentration at depths of 0–10 cm and 10–40 cm across 145 ranches spanning four California regions. Linear mixed-effects models showed that SOC was consistently higher in topsoil than subsoil and highest in coastal sites relative to interior valleys. Bulk density was the strongest negative predictor of …
American Elderberry's Next Top Pollinator: Evaluating The Role Of Arthropods In Pollination,
2026
Missouri State University
American Elderberry's Next Top Pollinator: Evaluating The Role Of Arthropods In Pollination, Jenny K. Burrow
Graduate Theses/Dissertations
American elderberry (Sambucus nigra subsp. canadensis) is a woody deciduous shrub native to eastern North America. In addition to its long history of use by indigenous peoples, there is renewed interest in cultivating and consuming American elderberry, primarily driven by expanding health supplement markets. Despite recent advances in horticultural development of American elderberry, its pollination ecology remains poorly understood. In this field study, I evaluated the contribution of arthropod visitors to pollination of American elderberry. To do this, I first characterized the identities and abundances of arthropod visitors via timed arthropod collections and floral observations during peak flowering …
Current And Historical Occurrences Of Rare Coastal Plants In The Hampton Falls Salt Marshes,
2026
University of New Hampshire, Durham
Current And Historical Occurrences Of Rare Coastal Plants In The Hampton Falls Salt Marshes, Liliana T. Chirichella
Honors Theses and Capstones
A botanical survey of two sites in the Hampton Falls saltmarshes was conducted to document the occurrences of a list of eleven endangered and threatened coastal plants listed in the Natural Heritage Bureau’s NH Rare Plant List. This survey was conducted in fulfillment of the NH Native Plant Protection Act to highlight and identify target species in an area where restorative runneling is to be implemented in order to restore proper hydrology and prevent further expansion of mega-pools in the Little River and Depot Road salt marsh sites, which have been subject to historical ditching and are a part of …
A New Dioecious Bush Tomato, Solanum Nectarifolium (Solanaceae), From The Northern Tanami Desert, Northern Territory, Australia, With Reassessment Of S. Ossicruentum And A Change In The Circumscription Of S. Dioicum,
2025
Bucknell University
A New Dioecious Bush Tomato, Solanum Nectarifolium (Solanaceae), From The Northern Tanami Desert, Northern Territory, Australia, With Reassessment Of S. Ossicruentum And A Change In The Circumscription Of S. Dioicum, Christopher T. Martine, Kym Brennan, Jason T. Cantley, Aiden Webb, Geoffrey Newton
Faculty Journal Articles
A new species of functionally dioecious bush tomato from the “Solanum dioicum + S. echinatum group” of Solanum subgenus Leptostemonum is described. Solanum nectarifolium Martine & Brennan, sp. nov., is a member of the taxonomically challenging Solanum dioicum W.Fitzg. species complex in Australia and differs from other species in the group by the presence of prominent and conspicuous extrafloral nectaries on the abaxial leaf surfaces, a tinge of purple on the new growth and young fruiting calyces, and curved prickles on young stems. Although fairly well represented in herbarium collections, this new taxon has historically been treated as a …
Clerodendrum Kelli (Lamiaceae), A New Species From Carranglan, Nueva Ecija, Philippines, And Lectotypification Of Clerodendrum Mindorense,
2025
Ateneo de Manila University
Clerodendrum Kelli (Lamiaceae), A New Species From Carranglan, Nueva Ecija, Philippines, And Lectotypification Of Clerodendrum Mindorense, David Justin R. Ples, Jacek Patykowski, John Charles A. Altomonte, Adriene B. Tobias, Rene Alfred Anton Bustamante
Biology Faculty Publications
Clerodendrum kelli (Lamiaceae), a new species from the montane forests of Carranglan, Nueva Ecija, Philippines, is described and illustrated. The species shares morphological features with Clerodendrum quadriloculare and C. mindorense, but differs in inflorescence structure, corolla tube length, and calyx shape and color. A lectotype for C. mindorense is also designated. Preliminary conservation assessment places C. kelli in the Critically Endangered category (CR B1ab(iii)+2ab(iii)). This study contributes to Philippine plant biodiversity knowledge and informs conservation strategies.
Oregon State Rank Assessment For Plumed Clover (Trifolium Plumosum Var. Plumosum),
2025
Portland State University
Oregon State Rank Assessment For Plumed Clover (Trifolium Plumosum Var. Plumosum), Nora Dunkirk
Institute for Natural Resources Publications
Oregon state conservation status assessment for Plumed Clover (Trifolium plumosum var. plumosum) using NatureServe methodology, 2025.
Exploring The Potential Of Martian Agriculture: Assessing Viability And Nutritional Composition Of Plants Cultivated In Martian Regolith,
2025
Harding University
Exploring The Potential Of Martian Agriculture: Assessing Viability And Nutritional Composition Of Plants Cultivated In Martian Regolith, Abigail Ross
Honors Theses
In addition to sunlight and water, plants can utilize a small number of nutrients from the soil to biosynthesize all the materials that are needed for growth and development. However, plants require an environment where they are able to obtain those nutrients, such as iron, magnesium, potassium, sulfur, and nitrogen. Environmental factors determine the types and accessibility of nutrients available to plants. Plants then take up these nutrients from the soil to aid in biological mechanisms and the synthesis of important molecules needed for growth and development. Ascorbic acid, commonly known as Vitamin C, is a vital molecule that is …
Patch Mow Grazing: Investigating The Effects Of Mowing On Forage Nutritive Value, The Biomass–Nutritive Value Relationship, And Herbivore Selection,
2025
University of Nebraska-Lincoln
Patch Mow Grazing: Investigating The Effects Of Mowing On Forage Nutritive Value, The Biomass–Nutritive Value Relationship, And Herbivore Selection, Trace R. Stauble
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Herbivore foraging behavior plays a critical role in shaping grassland structural heterogeneity, with selection often driven by forage biomass and nutritive value. Currently, it is thought that herbivores primarily select areas that are greater in nutritive value, and low in biomass. More specifically, disturbances like fire and grazing have been thoroughly studied showing that recently burned and grazed areas are not only higher in nutritive value but disproportionately selected by herbivores in comparison to undisturbed areas. However, most studies address only narrow ranges of defoliation, comparing intensely defoliated sites (< 10 cm) to those that are either not defoliated or have experienced a much longer time since defoliation, thereby decreasing grazing pressure as biomass increases. However, one of the most widely used methods of defoliation in grasslands, mowing, hasn’t been thoroughly studied for its effects on nutritive value, and how it impacts herbivore selection. Our study aimed to (1) evaluate how mowing treatments—i.e., short (5 cm), medium (18 cm), and tall (>30 cm, unmown)—affect nutritive value and herbivore selection, (2) assess …
Cover Crop Influence On Arthropod Biodiversity And Soil–Water Dynamics In A Semi-Arid Maize–Soybean Sequence Of The Nebraska High Plains,
2025
University of Nebraska-Lincoln
Cover Crop Influence On Arthropod Biodiversity And Soil–Water Dynamics In A Semi-Arid Maize–Soybean Sequence Of The Nebraska High Plains, Carlos Eduardo De Oliveira Martins
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
With the expansion of cover crop (CC) use in semi-arid regions, producers in the Nebraska High Plains are increasingly interested in understanding how CCs influence both beneficial arthropods and soil-water within maize-soybean (Zea mays L., Glycine max [L.] Merr.) rotations. Integrating CCs in these systems can enhance soil water availability and beneficial insect activity, but potential trade-offs include higher early-season water use by CCs and the risk of increasing potential pest populations. This thesis addresses these questions through two complementary studies conducted under field conditions near Brule, Nebraska. The first study evaluated the effects of a multi-species CC mixture …
Evaluating Metamitron Efficacy For Glyphosate-Resistant Palmer Amaranth (Amaranthus Palmeri) Management In Sugarbeet Across The Central High Plains,
2025
University of Nebraska-Lincoln
Evaluating Metamitron Efficacy For Glyphosate-Resistant Palmer Amaranth (Amaranthus Palmeri) Management In Sugarbeet Across The Central High Plains, Abraham Akuoko
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Herbicide-resistant (HR) Palmer amaranth (Amaranthus palmeri S. Watson) is regarded as one of the most prominent weeds within sugarbeet fields across the Central High Plains, with limited chemical control options. Although a few herbicides are available, their use is restrictive due to crop injury concerns and can only be applied at or after the 2–4 true leaf (TL) growth stage, which will provide no control for already emerged weeds. However, Palmer amaranth often emerges between sugarbeet planting and the 2 TL sugarbeet growth stage. Consequently, as of 2023, there were no herbicide options to control Palmer amaranth in sugarbeet …
Characterizing The Germination Process And Establishing Best Practices For Seed Propagation Of Tamaulipan Thornscrub Species For Habitat Restoration,
2025
The University of Texas Rio Grande Valley
Characterizing The Germination Process And Establishing Best Practices For Seed Propagation Of Tamaulipan Thornscrub Species For Habitat Restoration, Saroj Dhakal
Theses and Dissertations
Tamaulipan thornscrub is an imperiled plant community of southern Texas and northeastern Mexico. Given its importance for biodiversity conservation, stakeholders have been involved in restoration programs using seedlings grown from wild seeds. However, stakeholders often report that insufficient seedling supply is a challenge. To address knowledge gaps in seed germination behavior limiting seedling production, this study was conducted on 18 Tamaulipan thornscrub species, identified by growers as difficult to germinate. Seeds of all studied species are orthodox except Amyris texana, which have recalcitrant properties. Nine species have physical dormancy that was successfully addressed with mechanical and/or chemical scarification. Other species …
Post-Fire Soil Health Assessment Of The Grasslands And Woodlands In The Semi-Arid Nebraska Sandhills,
2025
University of Nebraska-Lincoln
Post-Fire Soil Health Assessment Of The Grasslands And Woodlands In The Semi-Arid Nebraska Sandhills, Stephanie M. Lugo
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Grasslands in the Nebraska Sandhills are shaped by natural wildfires, which help maintain the structure and function of native grasslands. In recent decades, afforestation with ponderosa pine and eastern redcedar has introduced new woodlands that altered the region’s fire dynamics and raised important questions about the effects of wildfire on different vegetation types. As wildfires become more frequent, understanding their impacts on soil health in grasslands and woodlands becomes increasingly important. This study examines the short-term effects of the 2022 Bovee Fire on physical, chemical, and biological soil properties in native grasslands and ponderosa pine and eastern redcedar afforested woodlands. …
Comparative Cytogenetics Study Via Fluorescent Chromosome Banding Of Three Solanum L. Species,
2025
TÜBİTAK
Comparative Cytogenetics Study Via Fluorescent Chromosome Banding Of Three Solanum L. Species, Mona Abd Elgawad, Rim Hamdy, Ibrahim El Garf, Amany Sallam Abdo
Turkish Journal of Botany
Solanum L. subg. Solanum sect. Solanum has a wide distribution in Egypt with multiple overlapping morphological features, rendering the taxonomy of the Solanum nigrum complex difficult at the species level. This study focused on the S. nigrum complex, which consists of S. nigrum L., S. sinaicum Boiss., and S. villosum Mill. Cytogenetic characterization can provide additional taxonomic data and can be used to evaluate genetic diversity at the species level. We performed karyotype analysis of 3 Egyptian species for the first time by studying fluorescence banding patterns via 4’6-diamidino-2-phenylindole (DAPI) and chromomycin A3 (CMA). The three species vary noticeably in …
Biochar Derived From Different Sources Ameliorates The Phytochemical And Physiological Characteristics Of Foxtail Millet (Setaria Italica) Under Water Stress, Mohammad Keshavarz, Ehsan Bijanzadeh, Hamid Reza Boostani
Turkish Journal of Botany
Organic material, such as biochar, can improve soil fertility and crop yield under water stress. A pot experiment was conducted to consider the effects of biochar on the pigment content, enzyme activity, physiological characteristics, and nutrient uptake of foxtail millet under water stress. Plants were tested under normal, mild, and severe irrigation regimes (100%, 75%, and 50% field capacity, respectively) using different biochar sources (licorice root biochar (LRB), cow manure biochar (CMB), cotton residue biochar (CRB), and municipal waste biochar (MWB)) and a control without fertilizer. Under severe water stress, the chlorophyll a content and total chlorophyll increased by 137.3% …
Protective Role Of Salicylic Acid Against Abiotic Stresses In Horticultural Crops: A Review,
2025
Begin type..Ataturk.
Protective Role Of Salicylic Acid Against Abiotic Stresses In Horticultural Crops: A Review, Faisal Hayat, Xiaoyun Zhang, Mohammed Alyafei, Fareeha Shireen, Ummara Khan, Sumeera Asghar, Sezai̇ Erci̇şli̇, Karthishwaran Kandhan, Mohamed S. Sheteiwy, Yali Zhang, Xiaoyan Lu
Turkish Journal of Botany
Environmental stressors such as drought, floods, salinity, extreme temperatures, and heavy metal toxicity are major threats to horticultural plants because they disrupt plant physiological mechanisms, leading to reduced yield and quality. Salicylic acid (SA) is a plant hormone that regulates various physiological and biochemical functions in plants. Moreover, it regulates hormonal balance, enhances the absorption of essential nutrients, promotes photosynthesis and the production of antistress compounds, and improves stress resistance. This comprehensive review explains several physiological and biochemical activities that are affected by SA under stressful conditions, such as stomatal regulation, antioxidant defense systems, osmotic adjustment and gene expression regulation. …
Nickel Toxicity To Safflower Seed Germination And Seedling Morphoanatomy,
2025
TÜBİTAK
Nickel Toxicity To Safflower Seed Germination And Seedling Morphoanatomy, Uğurcan Baran, Sude Tanik, Mert Can Vardar, Güray Ülger, Ahmet Aksoy
Turkish Journal of Botany
The safflowers (Carthamus tinctorius L. cv Olas) grown hydroponically under nickel (Ni) stress were examined in this study. T he effects of 0, 0.75, 1, 3, 5, 10, and 15 mM Ni on seed germination rate, protein, and pigment content of germinating seeds were investigated. Also, the toxicity of 0.75 mM Ni on plant growth, malondialdehyde (MDA) amount, and anatomy of 21-day-old safflower seedlings were studied. Ni adversely affected the germination rate, radicle length, protein, and pigment content of safflower seeds, particularly when higher than 3 mM. It also negatively affected the biomass production, plant length, leaf number, and MDA …
