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Articles 121 - 148 of 148
Full-Text Articles in Ecology and Evolutionary Biology
Costs And Benefits Of Hipv-Mediated Eavesdropping Under Field Conditions., Grace Ellin Freundlich
Costs And Benefits Of Hipv-Mediated Eavesdropping Under Field Conditions., Grace Ellin Freundlich
Electronic Theses and Dissertations
Eavesdropping is defined as the act of an organism taking advantage of a cue that was not originally intended for them for their own gain. Plant-mediated eavesdropping is a widely documented phenomenon and eavesdropping cues range from oviposition cues to airborne volatile compounds. Eavesdropping is predicted to be widespread because eavesdropping confers a fitness advantage. In plants, eavesdropping on herbivore-induced plant volatiles (HIPVs) often results in enhanced resistance profiles upon herbivory. As a result of this enhanced resistance, it is predicted that eavesdropping alone incurs minor costs due to resource shifts towards inducible defense responses. Although HIPV-mediated eavesdropping is widely …
Role Of Plant Volatile Organic Compounds (Vocs) In Seed Priming And Plant-Herbivore Interactions., Abhinav Kumar Maurya
Role Of Plant Volatile Organic Compounds (Vocs) In Seed Priming And Plant-Herbivore Interactions., Abhinav Kumar Maurya
Electronic Theses and Dissertations
This dissertation explores and expands the existing knowledge on the role of plant volatiles in facilitating seed priming and providing direct defense against herbivore. Although the roles of plant volatiles in priming a plant’s defenses and providing direct defense against pests is well known, information regarding their effects on seed and the fitness of future plants and direct toxicity to herbivores is understudied. This dissertation does a thorough examination of these two understudied aspects of plant volatiles and provides novel insight into the role of plant volatiles in seed priming and direct defense (Chapter I). Seeds in the soil can …
Aboveground-Belowground Interactions: Roles Of Soil Biotic And Abiotic Factors On Switchgrass's (Panicum Virgatum) Growth, Defense Against Herbivory And Cell Wall Chemistry., Binod Basyal
Electronic Theses and Dissertations
Plants constantly interact with their biotic and abiotic soil environments. Most terrestrial plants form beneficial associations with soil microbes such as arbuscular mycorrhizal (AM) fungi, which are widely known for their ability to transfer soil phosphorus and nitrogen to the host plants. They help plants tolerate drought stress and improve plant defense against herbivores such as plant-parasitic nematodes (PPNs). This dissertation investigates the role of AM fungi on switchgrass’s (Panicum virgatum) growth, cell wall chemistry, and defense against PPNs using a combination of growth chamber and field studies. Switchgrass is a native warm-season species which is gaining traction as candidate …
Do Eastern Gray Squirrels (Sciurus Carolinensis) Use Human-Provided Cues To Increase Foraging Success In Urban Landscapes?, Aditya A. Mehta, Jeeva H. Rathnaweera
Do Eastern Gray Squirrels (Sciurus Carolinensis) Use Human-Provided Cues To Increase Foraging Success In Urban Landscapes?, Aditya A. Mehta, Jeeva H. Rathnaweera
Undergraduate Arts and Research Showcase
The coexistence of humans with other animals in urban and suburban areas has given rise to a spectrum of agonistic and beneficial interactions. Animals thriving in urban settings are known to exhibit superior foraging and food extraction abilities compared to their wild conspecifics. This has raised the question regarding if non-human animals can form and maintain a similar “theory of mind” to humans based on the actions they observe in their environments (Schloegl et al., 2007). For this experiment, human-made click and gaze cues were used while placing food for eastern gray squirrels (Sciurus carolinensis) located on the …
Lightning Damage Stimulates Beetle Activity In A Tropical Forest, Samantha C. Vaughn, Kane A. Lawhorn, Evan M. Gora, Steve P. Yanoviak
Lightning Damage Stimulates Beetle Activity In A Tropical Forest, Samantha C. Vaughn, Kane A. Lawhorn, Evan M. Gora, Steve P. Yanoviak
Undergraduate Arts and Research Showcase
Disturbance alters the structure of ecological communities. Localized disturbances in tropical rainforests often create canopy gaps - patches of forest where large trees have fallen or are defoliated. Lightning is a major cause of large-tree mortality, and consequently gaps, in tropical forests. Lightning-caused gaps consist of abundant dead standing wood which likely is a predictable resource for saproxylic arthropods, specifically wood-boring beetles (Coleoptera). The goal of this study was to provide a preliminary evaluation of the beetles that are attracted to lightning-damaged trees in a tropical forest. We placed flight intercept traps in the subcanopy of 8 trees (4 struck …
Conspecifics And Familiar Odors Alter Movement Patterns In A Land Snail, Cepaea Hortensis, Madeleine Shelton, Jeeva Rathnaweera, Perri Eason
Conspecifics And Familiar Odors Alter Movement Patterns In A Land Snail, Cepaea Hortensis, Madeleine Shelton, Jeeva Rathnaweera, Perri Eason
Undergraduate Arts and Research Showcase
In some animals, unfamiliarity with a place and the presence of a conspecific can change movement patterns, often altering individuals’ routes, exploration, and the directions taken. Patterns such as these can affect individual survival, and thus might be present across a wide range of taxa, although mostly vertebrates have been studied. We used a native Kentucky land snail (white-lipped globe snail, Cepaea hortensis) to investigate how snail size, familiarity and the recent presence of a conspecific affect movement of snails in a novel environment. We also tested whether presence of a familiar smell influenced movement on a 25X25 cm …
Risk Assessment And Flight Decisions In Adult Versus Juvenile Squirrels (Sciurus Carolinensis), Alex Haydon, Jeeva Rathnaweera, Perri Eason
Risk Assessment And Flight Decisions In Adult Versus Juvenile Squirrels (Sciurus Carolinensis), Alex Haydon, Jeeva Rathnaweera, Perri Eason
Undergraduate Arts and Research Showcase
One way to quantify a prey’s response to a predator is by flight initiation distance (FID), the distance between a predator and prey at the moment the prey flees. As perceived risk from a predator increases, FID increases. Juvenile animals typically flee from approaching threats sooner than do adults because they have less able risk assessment. However, our observations suggested juvenile squirrels might use a different tactic: foraging near refuges. We first tested whether age affected squirrels’ FID in response to an approaching human on the UofL campus, where squirrels experience high levels of interactions with humans from an early …
Insect Populations Across An Urban-To-Suburban Land Use Gradient., Jacob T. Lawson
Insect Populations Across An Urban-To-Suburban Land Use Gradient., Jacob T. Lawson
College of Arts & Sciences Senior Theses
Insect populations, especially those of pollinators, have been steadily declining across the globe in recent decades, a trend that is intensified in cities. Since the conservation of pollinators is crucial for maintaining ecosystems and ecological processes, new approaches are being promoted beyond those of conserving large natural areas. Urban native plant gardens could potentially offset some of these losses locally. This research attempts to set a local baseline for the insect diversity in urban gardens in Louisville and determine whether differences exist in garden insects in cities versus suburbs in Jefferson County, Kentucky. To address the land-use question we established …
Impacts Of Ammonia And Temperature On Freshwater Snail Behavior And Physiology., Megan Christine Dewhatley
Impacts Of Ammonia And Temperature On Freshwater Snail Behavior And Physiology., Megan Christine Dewhatley
Electronic Theses and Dissertations
Gastropods are one of the most imperiled groups of animals in North America, yet there are major gaps in the literature pertaining to pollutants and climate change, and especially sublethal impacts. This dissertation assesses the effects of climate warming and unionized ammonia (NH3), one of the most abundant water pollutants, on the behavior and physiology of two caenogastropod snails: fine-ridged elimia (Elimia semicarinata) and Shawnee rocksnails (Lithasia obovata) (Gastropoda: Neotaenioglossa: Pleuroceridae). Righting behavior, or the movement used by snails to turn themselves right-side-up, was used as the main endpoint; delays in this behavior compromise …
The Population Ecology And Behavior Of The Cave Salamander, Eurycea Lucifuga (Rafinesque, 1822)., Joseph Gavin Bradley
The Population Ecology And Behavior Of The Cave Salamander, Eurycea Lucifuga (Rafinesque, 1822)., Joseph Gavin Bradley
Electronic Theses and Dissertations
The Cave Salamander, Eurycea lucifuga (Rafinesque, 1822), is a little-known species, yet a common inhabitant of caves in the eastern United States. Salamanders are often important components of ecological communities and ecosystems, influencing critical processes such as nutrient cycling and community composition through their predation on invertebrates. Cave-dwelling salamanders such as E. lucifuga may thus appreciably influence the relatively simple ecosystems and communities of caves. Any such influence may be particularly important because these habitats and the organisms that reside in them are often of conservation concern. I used non-invasive methods to study the demographics, movements, and habitat selection of …
Dead Wood And Decomposition In A Tropical Forest : Vertical Patterns, Long-Term Processes, And The Role Of Lightning., Evan Matthew Gora
Dead Wood And Decomposition In A Tropical Forest : Vertical Patterns, Long-Term Processes, And The Role Of Lightning., Evan Matthew Gora
Electronic Theses and Dissertations
This dissertation investigates the distribution, production, and decomposition of dead wood (or woody debris) in a lowland tropical forest within the Barro Colorado Nature Monument in Panama. Although the importance of woody debris is widely accepted, information describing components of WD pools and fluxes is generally separated in both time and space, particularly in understudied tropical forests. Here I provide a comprehensive inventory of woody debris in a lowland tropical forest (Chapter 1). Woody debris is highly aggregated and difficult to quantify, and this study demonstrates that historic estimates of woody debris pools and fluxes underestimate their uncertainty. In a …
Soil Ecology Of The Exotic Dune Grass Leymus Arenarius., Matthew L. Reid
Soil Ecology Of The Exotic Dune Grass Leymus Arenarius., Matthew L. Reid
Electronic Theses and Dissertations
Exotic plants can alter the structure and function of native communities both above- and belowground, which is particularly important in primary successional sand dune ecosystems where plant-soil interactions are critical drivers of successional dynamics. In Great Lakes sand dunes, the native foundation grass Ammophila breviligulata dominates early in succession until an accumulation of detrimental soil organisms causes its die-back of the grasses. Die-back of this native foundation species can be slowed by mutualistic interactions between plants and mycorrhizal fungi. Changes to the plant community resulting from invasion, and subsequent effects on the soil community have the potential to disrupt the …
The Effects Of Habitat And Connectivity On Tropical Ant Ecology And Behavior., Benjamin Jacob Adams
The Effects Of Habitat And Connectivity On Tropical Ant Ecology And Behavior., Benjamin Jacob Adams
Electronic Theses and Dissertations
This dissertation explores the role that physical connections among and within habitats play in determining the local diversity and behaviors of cursorial organisms. Understanding the processes that regulate local community assembly and that contribute to the maintenance of species diversity is a cornerstone of community ecology. Ants are a useful model for studies of local communities because they are abundant and fulfill a variety of ecological roles. Chapter one of the dissertation examines the how lianas (woody vines) function as connective structures among tree crowns and how these connections affect arboreal ant community structure within a tropical forest canopy. Trees …
The Role Of Ferric Reduction Oxidases In Plant Anti-Herbivore Defense., Virginia C. Nunamaker
The Role Of Ferric Reduction Oxidases In Plant Anti-Herbivore Defense., Virginia C. Nunamaker
College of Arts & Sciences Senior Theses
Iron is an essential element required for plants to carry out metabolic functions such as photosynthesis, heme biosynthesis, and chlorophyll biosynthesis. Within Arabidopsis thaliana, eight ferric reduction oxidase (FRO) genes function in iron uptake and homeostasis with tissue specific expression. However, little else is known regarding the biological role of FROs. Recent studies identify the FRO gene family as particularly responsive to the green leaf plant derived volatile (GLV) cis-3-hexenyl acetate (z3HAC). Since z3HAC acts as a wound signal and cues unaffected parts of the plant to prime defenses prior to herbivory, an increase in FRO activity in response …
Nonspreading Solutions In Integro-Difference Models With Allee And Overcompensation Effects., Garrett Luther Otto
Nonspreading Solutions In Integro-Difference Models With Allee And Overcompensation Effects., Garrett Luther Otto
Electronic Theses and Dissertations
Previous work in Integro-Difference models have generally considered Allee effects and over-compensation separately, and have either focused on bounded domain problems or asymptotic spreading results. Some recent results by Sullivan et al. (2017 PNAS 114(19), 5053-5058) combining Allee and over-compensation in an Integro-Difference framework have shown chaotic fluctuating spreading speeds. In this thesis, using a tractable parameterized growth function, we analytically demonstrate that when Allee and over-compensation are present solutions which persist but essentially remain in a compact domain exist. We investigate the stability of these solutions numerically. We also numerically demonstrate the existence of such solutions for more general …
Intraspecific Differences In Belowground Associations And Seedling Root Morphology For The Biofuel Crop, Panicum Virgatum., Erin Renee Kinnetz
Intraspecific Differences In Belowground Associations And Seedling Root Morphology For The Biofuel Crop, Panicum Virgatum., Erin Renee Kinnetz
Electronic Theses and Dissertations
The perennial C4 grass Panicum virgatum (switchgrass) is a promising bioenergy feedstock. Switchgrass is symbiotic with arbuscular mycorrhizal fungi (AMF). I examined 12 varieties of switchgrass grouped into 2 ecotypes (upland, lowland) to see if they differed in AMF abundance and root colonization using the GLBRC Variety Trials experiment. There was higher root colonization of lowland ecotype. A greenhouse experiment evaluated the role of live soil organisms in seedling establishment of 11 varieties. Live soil increased seedling survival, growth and influenced root morphology. Ecotypes differed in root architecture. Lowland developed a higher specific root length (SRL), a trait associated …
Environmental Factors, Not Plants, Contribute To Functional Diversity Of Soil Bacteria In The Dunes Of Lake Michigan., Andrea Stark Howes
Environmental Factors, Not Plants, Contribute To Functional Diversity Of Soil Bacteria In The Dunes Of Lake Michigan., Andrea Stark Howes
Electronic Theses and Dissertations
Soil bacteria play important roles in nutrient cycling and other ecosystem functions, and many biotic and abiotic factors can influence bacterial functional diversity. The goal of this field study was to examine differences among bacterial communities in sand dunes of Lake Michigan. I used Biolog Ecoplates™ to compare bacteria functional diversity associated with four different plant species: the native dune-building grass Ammophila breviligulata, invasive species Leymus arenarius and Gypsophila paniculata, and native legume Lathyrus japonicus across 13 sites in Michigan, representing a gradient in abiotic factors such as precipitation and temperature. I found no differences in bacterial function associated with …
Dietary Resource Utilization Patterns And Head Morphology Among Three Sympatric Watersnake Species., Micah Warren Perkins
Dietary Resource Utilization Patterns And Head Morphology Among Three Sympatric Watersnake Species., Micah Warren Perkins
Electronic Theses and Dissertations
The coexistence of similar species may be related to a variety of resource utilization differences. Dietary resource utilization variation may be the most important difference allowing for the coexistence of sympatric snake species. Many watersnakes (Nerodia spp.) live in sympatry and use similar aquatic habitats feeding on similar prey. While these sympatric watersnakes may have different general foraging patterns, snake diet may be affected by a variety of factors. Therefore, I initiated an investigation to understand the coexistence of sympatric plain-bellied (N. erythrogaster), diamondback (N. rhombifer) and northern (N. sipedon) watersnakes by addressing …
Effects Of Invasive Shrub Honeysuckle (Lonicera Maackii) And Forest Composition On Bird Communities In Woodland Stands., Katie Rae Lynch
Effects Of Invasive Shrub Honeysuckle (Lonicera Maackii) And Forest Composition On Bird Communities In Woodland Stands., Katie Rae Lynch
Electronic Theses and Dissertations
Invasive species pose a threat to aquatic and terrestrial ecosystems by decreasing biodiversity (Didham et al. 2005). Amur bush honeysuckle (Lonicera maackii) has typically reduced native plant diversity and altered animal communities by influencing animal abundance and activity (Collier and Vankat 2002). This study was intended to determine whether honeysuckle density or other characteristics of forested stands influence avian diversity, whether impacts are seasonally dependent, and whether correlations exist between attributes of forested stands and honeysuckle density. In order to test the hypotheses, thirteen forest stands within the Louisville Metropolitan Area were selected. They had similar tree composition …
Effect Of Migration, Carrying Capacity, And Fecundity On The Formation Of Clinal Patterns During Range Expansions., Neha J. Angal
Effect Of Migration, Carrying Capacity, And Fecundity On The Formation Of Clinal Patterns During Range Expansions., Neha J. Angal
Electronic Theses and Dissertations
Range expansions, empirically and in simulations, lead to clinal patterns of genetic diversity. Clines are often used as spatial markers of past migrations. This study investigated the effects of migration, growth, and carrying capacities on clinal patterns during range expansions, using forward-time simulations in Nemo. Initial results show, in the absence of prior population structure, range expansions result in a loss of diversity strongly affected by migration, growth, and carrying capacity. This loss of diversity did not persist to the final generation, corresponding to 10,000 years, indicating clinal patterns are less durable than previously assumed—challenging the utility of clinal patterns …
Insights Into The Introduction Histories And Population Genetic Dynamics Of The Nile Monitor (Varanus Niloticus) And Argentine Black And White Tegu (Salvator Merianae) In Florida., Jared Price Wood
Electronic Theses and Dissertations
This dissertation examines the population genetic dynamics of two Florida invasives: the Nile monitor (Varanus niloticus) and Argentine black and white tegu (Salvator merianae). I also provide insights into the introduction histories of both species. This study was developed as part of a collaborative effort with the Florida Wildlife Commission to expand our knowledge of these highly detrimental, invasive lizards. All research activities involving animals and animal tissues were approved by the University of Louisville’s Institutional Animal Care and Use Committee (IACUC Proposal #: 12024). I start with a brief introduction into what makes invasive species …
Woody Plant Communities Of Three Urban Wetlands And The Success Of An Invasive Shrub (Lonicera Maackii) Over Natural And Experimental Flooding Gradients., Meghan Rhea Langley
Woody Plant Communities Of Three Urban Wetlands And The Success Of An Invasive Shrub (Lonicera Maackii) Over Natural And Experimental Flooding Gradients., Meghan Rhea Langley
Electronic Theses and Dissertations
Globally, wetlands are known for providing important ecosystem services that enhance the quality of human life and regulating global biogeochemical cycles. Despite the wide recognition of their value, temperate forested wetlands are the least protected type of ecosystem world-wide, and are threatened by human activities such as logging and development. The ecology of forested wetlands remaining in urbanized areas is impacted by a multitude of anthropogenic threats, including fragmentation (which decreases the amount of interior habitat and increases edge habitat), hydrologic modification (ditching and draining of wetlands) and the incursion of invasive species (which are frequently introduced by human activities). …
Dietary Carotenoids And The Complex Role Of Redness In The Behavior Of The Firemouth Cichlid Thorichthys Meeki., Sarah Anne Fauque
Dietary Carotenoids And The Complex Role Of Redness In The Behavior Of The Firemouth Cichlid Thorichthys Meeki., Sarah Anne Fauque
Electronic Theses and Dissertations
This dissertation takes a comprehensive approach to the role of dietary carotenoids on redness and the subsequent behaviors in the firemouth cichlid, Thorichthys meeki. I start with a brief introduction into signaling, the importance of carotenoids, and mate choice. The dissertation is then divided into three data chapters which are designed to stand as independent manuscripts. Chapter II documents how altering the availability of dietary carotenoids affects redness in the integument of male and female T. meeki. I tracked how redness changed in color and distribution in individuals over the course of 12 weeks. I confirm that a dichotomy …
Impact Of Urban Factors And Invasive Species On White-Footed Mouse (Peromyscus Leucopus) Habitat Use And Foraging Behavior In An Urban Forest Park., William Persons
Impact Of Urban Factors And Invasive Species On White-Footed Mouse (Peromyscus Leucopus) Habitat Use And Foraging Behavior In An Urban Forest Park., William Persons
Electronic Theses and Dissertations
White-footed mice (Peromyscus leucopus) select for areas of greater canopy cover at the macro scale, and for areas with more CWD at the micro-scale. White-footed mice potentially avoid habitats with higher invasive species richness. White-footed mice preferentially foraged under the honeysuckle canopy in response to changes in temperature and humidity. This study suggests that the interaction between P. leucopus and ground layer invasive species is complex, and that the effect of moonlight may be diminished in this urban park. Urban ecosystems demonstrate high levels of anthropogenic land-use change, modification of abiotic inputs, and altered disturbance regimes. These changes result …
Plant Community Responses To Invasive Shrub And Vine Removal In An Urban Park Woodland., Eric Richard Moore
Plant Community Responses To Invasive Shrub And Vine Removal In An Urban Park Woodland., Eric Richard Moore
Electronic Theses and Dissertations
Counter to what some people think, urban areas can be biodiversity hotspots. Maintaining this biodiversity can be challenging, since exotic shrubs and vines block sunlight and threaten native plant regeneration. Since 2007, the Louisville Olmsted Parks Conservancy (LOPC) has spent $2 million on invasive plant management in Cherokee Park. Before the project began, long-term transects were established by the LOPC to collect baseline presence/absence data on 11 invasive plant species. In 2014, I revisited these transects and documented presence/absence data on the entire plant community. I found that four species (garlic mustard, winter creeper, Japanese honeysuckle, and English ivy) have …
Upper Pleistocene Human Dispersals Out Of Africa: A Review Of The Current State Of The Debate, Amanuel Beyin
Upper Pleistocene Human Dispersals Out Of Africa: A Review Of The Current State Of The Debate, Amanuel Beyin
Faculty and Staff Scholarship
Although there is a general consensus on African origin of early modern humans, there is disagreement about how and when they dispersed to Eurasia. This paper reviews genetic and Middle Stone Age/Middle Paleolithic archaeological literature from northeast Africa, Arabia, and the Levant to assess the timing and geographic backgrounds of Upper Pleistocene human colonization of Eurasia. At the center of the discussion lies the question of whether eastern Africa alone was the source of Upper Pleistocene human dispersals into Eurasia or were there other loci of human expansions outside of Africa? The reviewed literature hints at two modes of early …
Life History And Production Of Three Species Of Isopods In Beargrass Creek Louisville, Ky, James A. Eckstein
Life History And Production Of Three Species Of Isopods In Beargrass Creek Louisville, Ky, James A. Eckstein
Electronic Theses and Dissertations
The life history and annual production of the aquatic isopods L. fontinalis, C. intermedia and C. brevicaudus in a spring stream, Beargrass Creek, Louisville, Kentucky was studied. Reproductive activity was observed with the greatest intensity in the spring months from March to May. Smaller secondary peaks for recruitment of young were seen in the fall months for L. fontinalis and C. intermedia. Brood size for the three isopods was compared by linear regression. The mean annual biomass for the three isopods ranged from 0.67 g/m2 for C. intermedia, 0.83 g/m2 for C. brevicaudus to 2.1 g/m2 for L. fontinalis. Annual …
Abstracts Of Source Materials On The Conservation Of Our Natural Resources., Eunice Wheeler Duncan
Abstracts Of Source Materials On The Conservation Of Our Natural Resources., Eunice Wheeler Duncan
Electronic Theses and Dissertations
No abstract provided.