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Articles 1 - 19 of 19
Full-Text Articles in Integrative Biology
The Role Of Floodplain Connectivity In Shaping The Abundance, Size-Class Distribution, And Schooling Behavior Of The Associated Fish Assemblage, Adam H. Quade
LSU New Orleans Theses and Dissertations
The life histories of many Louisiana fishes are closely tied to the timing, magnitude, and duration of the Mississippi River flood pulse, which regulates the ecological connectivity and productivity of adjacent floodplain habitats. Anthropogenic modifications such as levee construction and water-control structures have disrupted these natural hydrologic linkages, altering habitat quality and community structure across the Lower Mississippi River Basin. This dissertation used high-resolution imaging sonar to investigate how fish assemblages, species, and collectives respond to changes in floodplain connectivity within the Richard K. Yancey Wildlife Management Area prior to hydrologic restoration. In the first chapter, I applied imaging sonar …
Trophic Roles And Climate-Driven Vulnerability For Benthic Invertebrates At Artificial Reefs In The Northern Gulf Of Mexico, Amanda Kirkland
Trophic Roles And Climate-Driven Vulnerability For Benthic Invertebrates At Artificial Reefs In The Northern Gulf Of Mexico, Amanda Kirkland
LSU New Orleans Theses and Dissertations
Artificial reefs are deployed to enhance marine habitats and fisheries, yet their role in supporting secondary production and their vulnerability to climate stressors remain understudied. This dissertation investigates the trophic ecology and climate sensitivity of benthic invertebrates at artificial reefs in the northern Gulf of Mexico. Chapter 1 assessed reef food webs using stable isotopes from fishes, invertebrates, and primary producers across six reefs and two seasons. Mixing models showed that most fishes rely on benthic reef carbon, while suspension feeders consume plankton and sediment microphytobenthos. Isotopic niche analysis revealed functional diversity and seasonal shifts in δ¹³C and δ³⁴S, though …
A Genetic And Spatial Analysis Of The Last Megafaunal Species (Tapirus Terrestris) In The Paraguayan Dry Chaco Forest, Emily Bowers
A Genetic And Spatial Analysis Of The Last Megafaunal Species (Tapirus Terrestris) In The Paraguayan Dry Chaco Forest, Emily Bowers
LSU New Orleans Theses and Dissertations
No abstract provided.
Genetic Aspects Of Resilience In The Foundational Seagrass Halodule Wrightii: The Role Of Genetic Variation And Gene Expression In Maintaining Primary Production, Anastasia M. Konefal
Genetic Aspects Of Resilience In The Foundational Seagrass Halodule Wrightii: The Role Of Genetic Variation And Gene Expression In Maintaining Primary Production, Anastasia M. Konefal
LSU New Orleans Theses and Dissertations
Seagrasses are coastal foundation species which significantly contribute to the primary production of shallow water ecosystems and provide several services. However, seagrasses, like other coastal foundation species, are threatened by myriad anthropogenic stressors. Conservation is difficult in ecosystems under multiple threats where the factors that contribute to production are not easily elucidated. Genetic diversity and gene expression may be related to the function and stability of populations but are rarely considered in management plans. High genetic diversity and the associated trait variation within a population are known to contribute to higher function and stability of a population. Additionally, individual-level changes …
Survival Of The Smartest? The Evolutionary Ecology Of Cognition In Anolis Lizards, Mahaut V. Sorlin
Survival Of The Smartest? The Evolutionary Ecology Of Cognition In Anolis Lizards, Mahaut V. Sorlin
LSU New Orleans Theses and Dissertations
Cognitive processes such as learning, memory, and decision-making are integral to an organism’s fitness, allowing to integrate cues from its environment and adjust its behavior accordingly. Historically, cognitive abilities were thought to have evolved according to a Scala Naturae design—an idea that has since been disproven—which suggested that complex cognitive abilities were exclusive to “higher” taxa. This perspective has created significant phylogenetic gaps in our understanding of cognitive evolution. In this dissertation I aimed to address this issue by investigating the evolution of cognition in reptiles, focusing on the green (Anolis carolinensis) and the brown anole (Anolis …
Seagrass Epibiont Biodiversity In The Northern Gulf Of Mexico, Kathryn Wyssmann
Seagrass Epibiont Biodiversity In The Northern Gulf Of Mexico, Kathryn Wyssmann
LSU New Orleans Theses and Dissertations
Epibionts on seagrass leaves contribute substantially to productivity and trophic interactions in seagrass ecosystems. Differences in epibiont assemblages and factors that contribute to epibiont diversity have been little studied on the seagrass Halodule wrightii in the northern Gulf of Mexico (nGoM). We used a metabarcoding approach to describe epibiont assemblages on H. wrightii leaves in four bays across the nGoM and to test whether epibiont assemblages differed spatially at local levels (within bays) or regional levels (from west to east). Furthermore, we tested if epibiont diversity was related to environmental conditions and/or seagrass productivity. Epibiont assemblages differed significantly between bays …
Past And Present Patterns Of Neutral And Adaptive Genetic Diversity In Wild Mandrills (Mandrillus Sphinx), Anna Weber
Past And Present Patterns Of Neutral And Adaptive Genetic Diversity In Wild Mandrills (Mandrillus Sphinx), Anna Weber
LSU New Orleans Theses and Dissertations
Although primates have fascinated researchers and the public alike for generations, one species that has remained enigmatic is the mandrill (Mandrillus sphinx), a large Cercopithecine monkey endemic to Central Africa. Mandrills are currently in decline due to bushmeat hunting, urbanization, and habitat loss. Neutral and adaptive genetic diversity are important tools for understanding evolutionary history and future viability, since diversity influences a species’ ability to adapt to a changing environment. However, thus far, minimal genetic information has been available for wild mandrills. Because of the dense vegetation in their tropical forest habitat, studying wild mandrills has proven to …
Environmental Sensitivity Of Maternal And Offspring Phenotype In The Green Anole (Anolis Carolinensis) Lizard, Jamie Marks
Environmental Sensitivity Of Maternal And Offspring Phenotype In The Green Anole (Anolis Carolinensis) Lizard, Jamie Marks
LSU New Orleans Theses and Dissertations
Animals dynamically invest their acquired energetic resources into fitness-related traits, and life-history trade-offs occur when limited resources are invested in a given trait at the expense of another. The phenotypic effects of life history trade-offs are well documented, but the mechanisms facilitating these trade-offs are poorly understood. One such mechanism is the insulin/insulin-like signaling (IIS) network, and specifically its two primary hormones: insulin-like growth factor 1 (IGF1) and insulin-like growth factor 2 (IGF2). IGF1 is well-characterized but IGF2 is severely understudied, though it is present in nearly all amniotes and sometimes expressed at higher levels than IGF1 in adulthood. I …
Chromosome Number Evolution, Phylogeography, And The Effects Of Climate Change On Species Distributions In Polyploid Plant Systems, Courtney H. Babin
Chromosome Number Evolution, Phylogeography, And The Effects Of Climate Change On Species Distributions In Polyploid Plant Systems, Courtney H. Babin
LSU New Orleans Theses and Dissertations
Polyploidy, a term used to describe organisms with cells having more than two paired sets of chromosomes, is a significant driver of diversification among land plants. Over a century of research has advanced our understanding of polyploidization in some taxa, but polyploid organisms remain understudied. In this dissertation, I investigate chromosome number evolution, phylogeographic structure, genetic differentiation, and the effects of climate change on ploidy level distribution using polyploid plant systems. In the first chapter, I inferred a molecular phylogeny of Allium, an economically important genus that includes cultivated crops and ornamentals, to investigate evolutionary transitions in chromosome number …
Repeated Boat Noise Exposure Damages Inner Ear Sensory Hair Cells And Decreases Hearing Sensitivity In Atlantic Croaker (Micropogonias Undulatus), Gina A. Badlowski
Repeated Boat Noise Exposure Damages Inner Ear Sensory Hair Cells And Decreases Hearing Sensitivity In Atlantic Croaker (Micropogonias Undulatus), Gina A. Badlowski
LSU New Orleans Theses and Dissertations
No abstract provided.
Fluctuating Parasite Prevalence Is Not Linked To Patterns Of Mhc Class Ii-Ss Diversity In An Island Endemic Reptile, Gina Zwicky
Fluctuating Parasite Prevalence Is Not Linked To Patterns Of Mhc Class Ii-Ss Diversity In An Island Endemic Reptile, Gina Zwicky
LSU New Orleans Theses and Dissertations
Few studies have explored the evolutionary mechanisms that maintain adaptive immunogenetic diversity in nature. We took advantage of museum samples to test for evidence of parasite-mediated fluctuating selection at MHC Class II-ß loci in an endemic island reptile. The Saban anole Anolis sabanus is commonly infected with three species of malaria (Plasmodium). Proportions of each parasite species detected in anole blood samples fluctuated over space and time, suggesting competitive interactions between parasites or differences in vector ecology. Our analyses of parasite prevalence and MHC Class II-ß allelic variation found that malaria infection was not associated with patterns of …
Co-Option Of The Yolkless Oocyte Receptor For Crispr/Cas9 May Induce Transient Sterility In Female Drosophila Grimshawi Flies, Bronwyn Miller
Co-Option Of The Yolkless Oocyte Receptor For Crispr/Cas9 May Induce Transient Sterility In Female Drosophila Grimshawi Flies, Bronwyn Miller
LSU New Orleans Theses and Dissertations
Evolutionary developmental biology has historically used generalist model organisms like Drosophila melanogaster. The Hawaiian Drosophilidae radiation, which occurred just 25 million years ago, is an ideal lineage for work in Evo-Devo. Hawaiian flies make up 25% of the world’s Drosophila species and extreme diversity is seen throughout the group. D. grimshawi is a generalist Hawaiian picture-wing fly that has served as a model for the Hawaiian Drosophilidae radiation. However, D. grimshawi’s power and use as a model organism is constrained by our lack of ability to manipulate its genome. In this work, I attempted to edit the genome of …
Having A High-Activity Catechol-O-Methyltransferase Allele Is Associated With Elevated Anxiety And Lower Salivary Dehydroepiandrosterone But Also Lower Alpha Amylase In Children With Chromosome 22q11.2 Deletion Syndrome., Jessie Beebe
LSU New Orleans Theses and Dissertations
Chromosome 22q11.2 deletion syndrome (22q11.2DS) results from a hemizygous deletion located on the long arm of chromosome 22. The most common deletion sizes affect between 30 and 90 genes. Individuals with 22q11.2DS may develop serious developmental and psychiatric disorders. The phenotype is highly variable, however, and may be influenced by allelic variation of the retained copies of genes covered by the deletion. I set out to examine the effects of two genes, catechol-O-methyltransferase (COMT) and proline dehydrogenase (PRODH), in relation to anxiety in children and adolescents with 22q11.2DS. Individuals with the major COMT allele (higher activity) have significantly higher anxiety …
Temporal Thermal Heterogeneity As A Potential Evolutionary Driver Of Thermoregulation In The Generalist Grasshopper Melanoplus Differentialis From Five Sites In The Midwestern And Southern United States, Devin Preston
LSU New Orleans Theses and Dissertations
Environmental drivers of the evolution of thermoregulation, especially thermal fluctuation, have been incompletely investigated. I used a combination of field and laboratory studies to determine if thermal heterogeneity selected for greater thermal tolerance or ability to thermoregulate in a generalist grasshopper by testing upper and lower thermal limits, behavioral thermoregulation, and acclimation. I measured these from individuals originating from sites that had varying degrees of thermal fluctuation over time. I found partial support for thermal heterogeneity as an evolutionary driver of thermal tolerance, behavioral thermoregulation, and acclimation. However, whether or not differences in these metrics conformed to my hypothesis varied …
Structure And Evolution Of Lizard Immunity Genes, Trent Santonastaso
Structure And Evolution Of Lizard Immunity Genes, Trent Santonastaso
LSU New Orleans Theses and Dissertations
One of the most important gene families to play a role in adaptive immunity is the major histocompatibility complex (MHC). MHC class II loci are considered to be the most variable loci in the vertebrate genome, and studies have shown that this variability can be maintained through complex co-evolutionary dynamics between host and parasite. Despite the rich body of research into the MHC, there is comparatively little understanding of its genomic architecture in reptiles. Similarly, loci associated with innate immunity have received little attention in reptiles compared to other vertebrates. In the first chapter, we investigated the structure and organization …
Characterizing The Function Of Lyases Involved In The Biosynthesis Of Phycoerythrin I And Ii From Marine Synechococcus Cyanobacteria, Lyndsay A. Carrigee
Characterizing The Function Of Lyases Involved In The Biosynthesis Of Phycoerythrin I And Ii From Marine Synechococcus Cyanobacteria, Lyndsay A. Carrigee
LSU New Orleans Theses and Dissertations
Marine Synechococcus are the second most abundant oxygenic phototrophs in the open ocean. They are efficient at harvesting available light using complex antenna, or phycobilisome, composed of allophycocyanin proteins and extended rod structures of phycocyanin and one or two types of phycoerythrin (PEI and PEII). This dissertation focuses on the enzymes called bilin lyases required for the biogenesis of PEI and PEII in marine strains of Synechococcus which undergo type 4 chromatic acclimation (CA4). I used interruption mutant analysis, high performance liquid chromatography, a protein expression system in E. coli, and liquid chromatography tandem mass spectrometry to characterize the …
Understanding The Impacts Of Current And Future Environmental Variation On Central African Amphibian Biodiversity, Courtney A. Miller
Understanding The Impacts Of Current And Future Environmental Variation On Central African Amphibian Biodiversity, Courtney A. Miller
LSU New Orleans Theses and Dissertations
Global climate change is projected to impact multiple levels of biodiversity by imposing strong selection pressures on existing populations, triggering shifts in species distributions, and reorganizing entire communities. The Lower Guineo-Congolian region in central Africa, a reservoir for amphibian diversity, is predicted to be severely affected by future climate change through rising temperatures and greater variability in rainfall. Geospatial modelling can be used to assess how environmental variation shapes patterns of biological variation – from the genomic to the community level – and use these associations to predict patterns of biological change across space and time. The overall goal of …
Phylogenetic Relationships And Evolution Of Snakes, Alex Figueroa
Phylogenetic Relationships And Evolution Of Snakes, Alex Figueroa
LSU New Orleans Theses and Dissertations
Snakes represent an impressive evolutionary radiation of over 3,500 widely-distributed species, categorized into 515 genera, encompassing a diverse range of morphologies and ecologies. This diversity is likely attributable to their distinctive morphology, which has allowed them to populate a wide range of habitat types within most major ecosystems. In my first chapter, I provide the largest-yet estimate of the snake tree of life using maximum likelihood on a supermatrix of 1745 taxa (1652 snake species + 7 outgroup taxa) and 9,523 base pairs from 10 loci (5 nuclear, 5 mitochondrial), including previously unsequenced genera (2) and species (61). I then …
Role Of Ime4 Protein In Pho Regulon Of S.Cerevisiae., Jenisha Ghimire
Role Of Ime4 Protein In Pho Regulon Of S.Cerevisiae., Jenisha Ghimire
LSU New Orleans Theses and Dissertations
In the yeast Saccharomyces cerevisiae, the IME4 methyltransferase, interacts genetically with methyl binding protein, Pho92, to affect the expression of PHO regulon target genes. Cells mutant in IME4 or PHO92 show increases in the RNA abundance of PHO regulon target genes. The increase in the RNA abundance of the PHO regulon target genes is not additive in the cells double mutant in IME4 and PHO92. Hence, Ime4 and Pho92 interact in a single pathway in PHO regulon. Surprisingly, cells overexpressing IME4 and MUM2 shows increase in some PHO regulon target genes, indicating that IME4 affects the PHO regulon target …