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Articles 1 - 6 of 6
Full-Text Articles in Biodiversity
Microbial Communities In The Guana Tolomato Matanzas National Estuarine Research Reserve: An Assessment Of The Responses Of Spartina Alterniflora Epiphytes To Nitrogen Enrichment, And A Characterization Of Benthic Cyanobacterial Diversity, Anne C. Hurley
UNF Graduate Theses and Dissertations
Elevated nitrogen and phosphorus inputs from anthropogenic sources, which can lead to significant increases in algal biomass and changes in algal community composition, poses a serious threat to estuarine ecosystems worldwide. While numerous studies have addressed the impacts of nutrient enrichment on epiphytic algae in seagrass habitats, few have investigated potential nutrient-driven changes to epiphytes on emergent salt marsh plants, such as Spartina alterniflora. Epiphytic microalgae on S. alterniflora play an important role in food availability in salt marsh ecosystems, and epiphytic nitrogen-fixing cyanobacteria also provide an important source of nitrogen for salt marsh consumers. The first study included …
Revitalizing Conservation And Management Of The American Crocodile (Crocodylus Acutus) In The Dominican Republic, Robert Greco
Revitalizing Conservation And Management Of The American Crocodile (Crocodylus Acutus) In The Dominican Republic, Robert Greco
UNF Graduate Theses and Dissertations
Crocodilian populations declined globally during the 20th century because of overhunting and habitat loss. Some crocodilian populations have recovered recently through legal protections and habitat restoration, but the status of many crocodilian populations are still unknown because of a lack of recent data. The American crocodile (Crocodylus acutus) population in the Dominican Republic (DR) is one of these data-deficient populations, with country-wide surveys not carried out since the 1980s. From May through July 2021 we surveyed areas within DR where C. acutus is still likely residing. Our surveys yielded no crocodile sightings in Monte Cristi, suggesting that …
Next-Generation Sequencing, Morphology, And Culture-Based Methods Reveal Diverse Algal Assemblages Throughout The Florida Springs, Alyssa Garvey
Next-Generation Sequencing, Morphology, And Culture-Based Methods Reveal Diverse Algal Assemblages Throughout The Florida Springs, Alyssa Garvey
UNF Graduate Theses and Dissertations
Algae are a group of highly diverse photosynthetic organisms found in variety of habitats. As the primary energy base in ecosystems, knowledge of the diversity and presence of certain algal lineages is paramount to our understanding of the trophic state of aquatic habitats. In recent years, the state of Florida has seen an increase of both marine and freshwater algal blooms. Similarly, filamentous algae have begun outcompeting vascular macrophytes throughout many of Florida’s springs as nutrient enrichment from anthropogenic sources increases. Traditionally, the Florida algal spring communities have been assessed using classic morphological methods, which may underrepresent the true biodiversity …
Effects Of Prescribed Fire On Upland Plant Biodiversity And Abundance In Northeast Florida, Peter D. Maholland
Effects Of Prescribed Fire On Upland Plant Biodiversity And Abundance In Northeast Florida, Peter D. Maholland
UNF Graduate Theses and Dissertations
Terrestrial ecosystems in the southeastern United States have evolved with fire as a common disturbance and as a result many natural communities require the presence of fire to persist over time. Human development precludes natural fires from occurring within these communities; however, prescribed fire is considered to be a critical tool in the effort to restore fire-dependent ecosystems after decades of fire exclusion. Direct effects of fire on individual floral and faunal species as well as benefits to biodiversity at the landscape (gamma diversity) level have largely been supported in previous research. However, information on the effects of natural and …
Bacteriostatic Effects Of Sucralose On Environmental Bacteria, Arthur Phillip Omran Jr.
Bacteriostatic Effects Of Sucralose On Environmental Bacteria, Arthur Phillip Omran Jr.
UNF Graduate Theses and Dissertations
Sucralose is a zero calorie sweetener developed and manufactured by Tate and Lyle Sweetener Company in the 1980’s. They sell the sweetener compounded with maltodextrin and dextrose under the brand name Splenda®. Sucralose was developed as a low cost artificial sweetener that is non-metabolizable in humans and can withstand changes in pH and temperature. It is not degraded by the waste water treatment process. Since the molecule can withstand heat, acidification and microbial degradation it is accumulating in the environment, and has been found in waste water, estuaries, rivers and the Gulf Stream. The highest concentration of environmental sucralose detected …
Response Of The Epiphytic Algal Communities To Experimentally Elevated Nutrient Levels In Intertidal Salt Marsh Habitats, Stephanie Verhulst
Response Of The Epiphytic Algal Communities To Experimentally Elevated Nutrient Levels In Intertidal Salt Marsh Habitats, Stephanie Verhulst
UNF Graduate Theses and Dissertations
Epiphytes are organisms attached to plants and are responsible for the majority of primary productivity in many aquatic systems. While epiphytes serve as a valuable food resource to herbivores, they may prove deleterious to the host plant by competing for light and nutrients, as well as increasing sheer stress. This study evaluated the impacts of nutrient additions, nitrogen and phosphorus, on the epiphytic algal community on Spartina alterniflora over the course of two growing seasons. Three nutrient treatments (N, P, and N+P) and one control treatment were placed in a salt marsh in the Tolomato River during the growing seasons …