Terrestrial and Aquatic Ecology Commons^™

Preventing Introductions To Sustain Healthy Ecosystems: Establish Eradication Protocols For A Popular Aquarium Seaweed, Julie Deslauriers

The Pegasus Review: UCF Undergraduate Research Journal

Aquarium release, a vector that introduces non-native species, recently caused the costly invasion of the green macroalga (seaweed) Caulerpa taxifolia along the Californian, Mediterranean, and Australian coasts. C. taxifolia was classified by the International Union for the Conservation of Nature as one of the world's 100 worst invasive species and cost California over $7 million to control with black tarps and chlorine bleach. Since the incident, educational efforts at conferences and conventions have influenced more than 50% of surveyed hobbyists to switch to another green macroalga, Chaetomorpha, as their primary alga in their saltwater tanks. C. taxifolia and Chaetomorpha …

The Impact Of Crown Conch On Intertidal Oyster Populations In Mosquito Lagoon, Casey Craig, Courtney Buck, Chelsea Landau, Jordan Filipponi

The Pegasus Review: UCF Undergraduate Research Journal

Commercial oyster harvesters in Florida have long complained that the Florida crown conch Melongena coronais in competition with them for harvestable-sized eastern oysters (Crassostrea virginica). Harvesters also suggest that crown conch, rather than overharvesting, has led to a large decline in oyster populations. To determine the role of M. corona on oysters in Mosquito Lagoon, we must first better understand the biology and ecology of M. corona., and to comprehend crown conch biology in Mosquito Lagoon along the east coast of central Florida, we conducted a three-part experiment in Canaveral National Seashore (northern Mosquito Lagoon). Specifically, …

Determining Tidal Elevations In Dry Elements Within A Coastal Salt Marsh Model, Martin Coleman

The Pegasus Review: UCF Undergraduate Research Journal

An integrated hydrodynamic/marsh biomass model is a useful tool for analyzing multiple hydrologic activities on a shoreline. A key component of this type of model is the location of local tidal elevations. During astronomic tide simulations, nodes in the finite element mesh are either wet or dry. At nodes that are continuously wet during the simulation, tidal elevations are computed from ADCIRC-2DDI (ADvanced CIRCulation) output. In areas that are intermittently wetted, tidal constituents cannot be determined using ADCIRC because the drying of nodes leaves a gap in the water-level time series. The Inverse Distance Weighting (IDW) interpolation method can be …

Improving Community-Based Shoreline Erosion Stabilization Projects: Impacts Of Potential Nurse Plants On Red Mangrove Biomass Production And Survival, Paula Yespelkis, Melinda Donnelly

The Pegasus Review: UCF Undergraduate Research Journal

Mangrove communities provide habitat for many terrestrial and aquatic species and act as nurseries and breeding grounds for fish, crustaceans, and birds. They also protect coastal areas from erosion and storm events. However, globally 35% of mangrove habitat has been degraded or destroyed, making mangroves one of the most endangered ecosystems on earth. Thus, there is a demand for methods to restore mangrove habitats successfully. The red mangrove (Rhizophora mangle) is often associated with other marsh plants. We investigated whether two marsh plants (Batis maritima, Sarcocornia perennis ) act as nurse plants and increase R. mangle success by altering seedling …

Cold Temperature Effects On Byssal Thread Production By The Native Mussel Geukensia Demissa Versus The Non-Native Mussel Mytella Charruana, Sasha Brodsky

The Pegasus Review: UCF Undergraduate Research Journal

Mytella charruana is a Central/South American mussel that has been found as an introduced species along the southeastern Atlantic coast of the United States since 2004. Previous experiments have determined the lethal thermal minimum of M. charruana to be between 6-9° C. Continuous byssal thread production is essential for mussel survival as it is used for attachment to substrates in natural environments, but may decrease when environmental conditions deviate from their optimum. We sought to determine whether M. charruana exhibits a non-lethal, thermal response involving a reduction in byssal thread production. Mytella charruana and, for comparison, a native mussel species, …

Allelopathy Of Invasive Brazilian Pepper (Schinus Terebinthifolius) On Mobile Invertebrates From The Indian River Lagoon, Lori Konar, Tiffany Sheldon, Stephanie Garvis, Melinda Donnelly

The Pegasus Review: UCF Undergraduate Research Journal

Brazilian pepper Schinus terebinthifolius is a highly invasive plant species that can be found in many different ecosystems, including the edges of estuaries in south and central Florida. Brazilian pepper fruits contain chemicals that are toxic to native salt marsh plants. Previous researchers found that high densities of crushed Brazilian pepper fruits negatively impacted growth and final biomass of the black mangrove Avicennia germinans and the red mangrove Rhizophora mangle. Here, we investigated the impact of S. terebinthifoliuson the viability of mobile estuarine invertebrates commonly found in the Indian River Lagoon, as well as the brine shrimp, a …

Crayfish Harvesting Practices In The Southern Atchafalaya River Basin: Quantitative And Qualitative Assessment Of Harvester Techniques And Hydrologic Connectivity Influence On Harvesting Strategies, Ivan A. Vargas-Lopez

LSU Master's Theses

Fisheries produce important impacts around the world through the exploitation of a wide range of species. In Louisiana, crayfish is the most emblematic crustacean and supports a multi-million industry based on pond culture and harvest from natural habitats. Although the economic value (USD) of wild-harvested crayfish has decreased from 10% to 3% of total crayfish value from 2013 to 2015, wild harvested crayfish are highly desired by many consumers and have a strong socio-cultural importance in Louisiana and other Gulf of Mexico coastal regions. This project evaluated harvesting practices by: 1) field observation and mapping of harvest sites in southwestern …

The Effects Of Tree Plantations And Land Use On Natural Regeneration Of Woody Plants In The Tropics: Diversity, Species Composition, Successional Dynamics, And Functional Traits, John Benjamin Longworth

LSU Doctoral Dissertations

As anthropogenic forests become more common in the tropics, there is a greater need to understand the factors that impact forest succession. I used censuses of woody plants in successional forests to study the effects of prior land use and tree plantations on species composition and richness. First, I tested the hypothesis that communities originating from different land uses were converging in species composition over time. I compared species composition using the Chao-Jaccard similarity index. I observed shifts in the dominant species during the first 30 years of succession, but not convergence of species composition in sites with different land-use …

Carbon Dioxide Fluxes And Plants Interactions Across The Succession Of A Created Brackish Marsh In Southwestern Louisiana, Andy T. Muench

LSU Master's Theses

The purpose of this study was to examine: 1) carbon dioxide (CO₂) fluxes in different plant communities in a created and natural brackish marsh and 2) the role of an early colonizing species, Spartina alterniflora, in facilitating or suppressing a later colonizer and higher marsh species, Spartina patens. CO₂ fluxes were measured in four key successional stages: 1) non-vegetated sediment of a newly created marsh; 2) Spartina alterniflora-dominated areas of a newly created marsh; 3) S. alterniflora-dominated natural marsh; and 4) Spartina patens- dominated natural marsh. Spartina alterniflora-dominated areas were sinks for …

Survey Results Of White (Carcharodon Carcharias) And Sevengill Sharks (Notorynchus Cepedianus) At Seal Island In False Bay, South Africa Between 2000 And 2018, Chris Fallows, Monique Fallows, Lacey Williams, Neil Hammerschlag

Supplementary Data and Tools

This dataset is associated to the article “Disappearance of white sharks leads to the novel emergence of an allopatric apex predator, the sevengill shark” by Hammerschlag et al. (2018), published in Nature Scientific Reports, DOI: 10.1038/s41598-018-37576-6. Specifically, these are the data used to create figures 3,4, and 5 as well as supplementary figures S1, S2, and S3. These data are the results of monitoring between 2000 and 2018 of white shark (Carcharodon carcharias) abundance patterns (N=6,333 shark sightings) and predatory activity (N=8,076 attacks on seals) at Seal Island, a Cape fur seal (Arctocephalus pusillus pusillus) colony in False Bay, …

Nebraska Invasive Plants Field Guide, Nebraska Invasive Species Program

Nebraska Invasive Species Program

Invasive species are plants, animals or pathogens that are non-native to an ecosystem. They cause harm to the economy, environment or human health. They negatively affect native species and ecosystems and interfere with outdoor recreation opportunities. This guide identifies federal and state-listed noxious weeds. Federal noxious weeds are regulated by the U.S. Department of Agriculture; State noxious weeds are regulated by the Nebraska Department of Agriculture, Animal and Plant Health Protection, Noxious Weed Program. Aquatic invasive species are listed and regulated by Nebraska Game and Parks Commission.

ABSINTH WORMWOOD • AMUR HONEYSUCKLE • AUTUMN OLIVE • BRITTLE NAIAD • CALLERY …

The Effects Of Drought On Ammonia-Oxidizing Archaea In Salt Marshes, Hayley Mcmahon

Biology Honors Papers

Severe droughts are expected to occur with increasing frequency under current climate change models. Droughts conditions lead to changes in the chemistry of salt marsh sediment by raising salinity, decreasing pH, and shifting conditions from anoxic to oxic. These changes have the potential to impact salt marsh microbial communities, including those involved in the nitrogen cycle. Ammonia-oxidizing archaea (AOA) carry out the oxidation of ammonia (NH3) to nitrite (NO2−), the first and most rate limiting step of nitrification. I analyzed community composition and abundance of AOA in sediment samples collected from a Connecticut salt marsh during 2016, a severe drought …

Impact Of Severe Drought Conditions On Ammonia-Oxidizing Bacterial Communities In A Connecticut Salt Marsh, Jack Beltz

Biology Honors Papers

Salt marsh ecosystems exist along a boundary between fresh and saline waterways, and their function is regulated by a variety of physical and chemical cycles. Microbial communities hold many important roles as mediators in these cycles, and like other aspects of the ecosystem are sensitive to changes in their environment. Climate change is expected to bring many obstacles for salt marshes around the world, one being periods of sustained drought. In this study we investigate the impact that a severe seasonal drought had on the abundance and community composition of microbes involved in nitrogen cycling, specifically ammonia-oxidizing bacteria (AOB). An …

Modeling Chlorophyll Concentrations On The Ohio River Using Remotely Sensed Data, Thaddaeus Stephen Tuggle

Theses, Dissertations and Capstones

Traditional direct water quality methodologies limit the ability to spatially and temporally predict algal blooms in lotic systems due to the size and characteristics of large river systems. Algal blooms potentially can be predicted by knowing the spatial and temporal patterns of change in cyanobacteria concentrations at large scales. Remote sensing studies investigating freshwater algal blooms, some known to secrete harmful toxins, are primarily conducted on lentic systems while large lotic systems are greatly ignored. In this study I developed a chlorophyll concentration estimation model for the Ohio River using a satellite remote sensing approach. Ground-truth water quality measures, including …

Freshwater Mussels Of The Greenup Navigational Pool, Ohio River, With A Comparison To Fish Host Communities, Mitchell David Kriege

Theses, Dissertations and Capstones

The Ohio River was historically a free-flowing system with diverse fish and freshwater mussel communities. Heavy industrialization, erosion from deforestation, and wide scale damming during the early-mid 20th century decimated riverine life. While mussel declines are well documented in the United States, in big river systems, freshwater mussel populations are poorly understudied. This thesis project mapped the mussel communities and site-specific sediments of the Greenup pool in the Ohio River for comparison to 2016 nighttime electrofishing data, provided by ORSANCO. Qualitative SCUBA surveys were performed at 18 randomly selected sites and two fixed sites between July and September. Each site …

Amphibians Among Road-Rut Pools In West Virginia, Abby L. Sinclair

Theses, Dissertations and Capstones

As anthropogenic environmental stressors such as urbanization continue to increase, it is necessary to understand their impact on amphibian ecology. Due largely to their biphasic life history amphibians are negatively impacted by the destruction of lotic habitats i.e., wetlands for the creation of roads and urban centers. I examined the effects of three human-made road rut pools on the reproductive success and species richness of amphibians in southwest West Virginia from May to October 2012. I employed three detection techniques: drift fence pitfall trap arrays, funnel traps and dipnet sampling. Additionally, habitat covariates were taken (i.e., water depth) at each …

Modular Structure In Fish Co-Occurrence Networks: A Comparison Across Spatial Scales And Grouping Methodologies, Daniel Mcgarvey Dr., Joseph Veech

Environmental Studies Publications

Network modules are used for diverse purposes, ranging from delineation of biogeographical provinces to the study of biotic interactions. We assess spatial scaling effects on modular structure, using a multi-step process to compare fish co-occurrence networks at three nested scales. We first detect modules with simulated annealing and use spatial clustering tests (interspecific distances among species’ range centroids) to determine if modules consist of species with broadly overlapping ranges; strong spatial clustering may reflect environmental filtering, while absence of spatial clustering may reflect positive interspecific relationships (commensalism or mutualism). We then use non-hierarchical, multivariate cluster analysis as an alternative method …

Social Conflict On The Seas: Links Between Overfishing-Induced Marine Fish Stock Declines And Forced Labor Slavery, Jessica L. Sparks

Electronic Theses and Dissertations

Despite media attention detailing labor abuses in fisheries, social-ecological systems research has largely failed to consider whether fish stock declines could be contributing to increases in forced labor slavery. Empirical fisheries data suggests, though not a ubiquitous response to declining stocks, many vessels will fish longer, farther from shore, and deeper in waters to maintain yields. This effort intensification increases production costs, and Brashares et al. (2014), consistent with slavery theory, posited cheap and/or unpaid labor as an approach to offset increasing costs and continue harvesting fish species at a rate otherwise cost-prohibitive.

Using fuzzy cognitive mapping - a participatory, …

Post-Darwin Skepticism And Run-Of-The-Mill Suicide, John Hadley

Animal Sentience

Peña-Guzmán’s depiction of the opponent of animal suicide as a conservative is a straw man. It is possible to accept that animals are self-conscious and reflexive yet still reject the view that they have the mental wherewithal to commit run-of-the-mill suicide. That animal behaviour can be positioned on a continuum of self-destructive behaviour does not establish that animals can intentionally kill themselves.

An Adaptationist Perspective On Animal Suicide, Timothy P. Racine

Animal Sentience

Peña-Guzmán’s discussion of suicide in nonhuman animals has broad implications. In this commentary, I focus on the logical relation between suicide and intention. Proximate cause must be distinguished from ultimate function in explanations of suicide. I briefly discuss two adaptationist accounts of suicidal behavior.