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Articles 31 - 39 of 39
Full-Text Articles in Oceanography
Distributions Of Polychaetes As A Function Of Sediment Composition In A Subtropical Lagoon, Anthony William Cox
Distributions Of Polychaetes As A Function Of Sediment Composition In A Subtropical Lagoon, Anthony William Cox
Theses and Dissertations
Fine-grained organic-rich sediments (FGORS) in the Indian River Lagoon (IRL), Florida, the human activities and nutrient inputs and have a varied composition, including water content, silt-clay content, and organic matter. When these constituents reach, by weight, 75%, 60% dry, and 10% dry, respectively, this is sometimes referred to as IRL “muck”. Many polychaetes inhabit the benthic sediments of estuaries and must tolerate various degrees of FGORS. The Cox IRL Muck Index (CMI) is proposed as a mechanism for determining the organic sediment tolerances of infaunal species in a simple and direct manner. IRL muck will have a minimum CMI of …
The Tolerance Of Benthic Infauna To Fine-Grained Organic Rich Sediments In A Shallow Subtropical Estuary, Daniel Christopher Hope
The Tolerance Of Benthic Infauna To Fine-Grained Organic Rich Sediments In A Shallow Subtropical Estuary, Daniel Christopher Hope
Theses and Dissertations
Fine-grained organic-rich sediments (FGORS) from anthropogenic impacts are a growing concern for bays and estuaries around the world. This study explores the relationships between infaunal community diversity and species’ abundances with FGORS in the Indian River Lagoon and its tributaries. To examine these potential relationships, infauna were collected monthly using a Petit Ponar grab at 16 stations in the central Indian River Lagoon from October 2015 to August 2016. Abundant taxa in these sediments include polychaete worms (e.g., the polychaete Nereis succinea), molluscs (e.g., clam Parastarte triquetra), and arthropods (e.g., the tanaid Leptochelia dubia) with densities as high as 5.3x10⁴ …
Categorizing “Muck” In The Indian River Lagoon, Florida, Based On Chemical, Physical And Biological Characteristics, Katherine Mae Beckett
Categorizing “Muck” In The Indian River Lagoon, Florida, Based On Chemical, Physical And Biological Characteristics, Katherine Mae Beckett
Theses and Dissertations
During the past six decades, the thickness and areal extent of muck sediments have continually increased in the Indian River Lagoon (IRL), Florida. These sediments are anoxic, store and release nutrients, and destroy natural benthic habitats. The main objective of this research was to develop guidelines that help prioritize sites for muck removal based on the following: (1) biological abundance and diversity, (2) muck thickness, and (3) the physical and chemical composition of muck. Thinner muck deposits (20-40 cm), collected during two seasons at eight locations in the lagoon and adjacent creeks, had greater variability in sediment composition and ~5 …
The Role Of Biotic And Environmental Factors In Spatial And Temporal Variability Of Indian River Lagoon Copepod Communities, Hannah G. Kolb
The Role Of Biotic And Environmental Factors In Spatial And Temporal Variability Of Indian River Lagoon Copepod Communities, Hannah G. Kolb
Theses and Dissertations
The role of zooplankton communities as the link between phytoplankton and secondary consumers is dependent on the species make-up of the copepod community. Copepods often dominate zooplankton in numbers and biomass and are frequently the dominant grazers. Species variabilities in behavioral and morphological traits, and seasonal variances in species make-up, have the potential to alter trophic dynamics in planktonic communities. The goal of this study was to identify the driving forces behind copepod community composition and better understand the role of key species in the Northern Indian River Lagoon (N-IRL). Copepods made up 76% of the N-IRL zooplankton community and …
Exploring The Role Of Biofilms In The Transport And Establishment Of Invasive Marine Macrofoulers, Lynn Holly Sweat
Exploring The Role Of Biofilms In The Transport And Establishment Of Invasive Marine Macrofoulers, Lynn Holly Sweat
Theses and Dissertations
Biofilms dominated by bacteria and diatoms universally colonize submerged surfaces and mediate larval recruitment in benthic marine systems. The ability for macrofoulers to be transported by vessels and become globally established is likely affected by cues from the biofilm organisms they encounter. This study investigates how macrofoulers respond to biofilms shaped by local geography, transport processes and relocation. Biofilm assemblages in neighboring ports were largely unique to the site at which they were developed. Bacteria were primary drivers of variations among sites, and overall bacterial richness was an order of magnitude higher than has been reported for other marine environments. …
Benthic Foraminiferal Distributions In A Shallow Subtropical Estuary And The Influence Of Environmental Factors, Maria Angelica Zamora-Durán
Benthic Foraminiferal Distributions In A Shallow Subtropical Estuary And The Influence Of Environmental Factors, Maria Angelica Zamora-Durán
Theses and Dissertations
Benthic foraminiferal communities are potentially useful tools for assessing and monitoring estuarine ecosystems and as bioindicators of water quality and pollution. To evaluate this indicator for the Indian River Lagoon (IRL) benthic ecosystem, the densities and distributions of Foraminifera were measured in Turkey Creek (Palm Bay, Florida), Crane Creek (Melbourne, Florida), and the adjacent IRL. Spatial population patterns were compared with parameters characterizing benthic sediments, including silt and clay content, organic matter (OM), and associated boundary water column conditions including salinity, temperature, and dissolved oxygen (DO. Samples (n=145) were collected from October 2015 to December 2015 at 12 locations. Four …
Simulating Bottom Reflectance Retrievals Using An Analytical Solution For The Two-Flow Irradiance Models, Tyler A. Rotkiske
Simulating Bottom Reflectance Retrievals Using An Analytical Solution For The Two-Flow Irradiance Models, Tyler A. Rotkiske
Theses and Dissertations
Existing analytical solutions to the two-flow irradiance equations are used to obtain new relations for simulating hyperspectral bottom reflectance signatures. Synthetic bottom reflectance signatures are compared to measured bottom reflectance signatures in order to test the model equation limitations of the formulations. Measured hyperspectral bottom reflectance signatures for a dead reef, Elkhorn coral, seagrass and sand, sand, and turtle grass are used. Estimated collimated and diffuse irradiances are inputs needed to run model formulations. Also, specific absorption, specific backscattering coefficients, and water depth for ocean, coastal, and estuarine waters are used as inputs to simulate bottom reflectance retrievals. The specific …
Oceanic Transport And Life History Of The Tropical Western Atlantic Opossum Pipefish, Microphis Brachyurus Lineatus, Sarah Frias-Torres
Oceanic Transport And Life History Of The Tropical Western Atlantic Opossum Pipefish, Microphis Brachyurus Lineatus, Sarah Frias-Torres
Theses and Dissertations
The opossum pipefish, Microphis brachyurus lineatus, is a tropical migratory syngnathid. Adults live and breed in freshwater tributaries in specific emergent vegetative habitats. Juveniles associate with pelagic Sargassum in the tropical western Atlantic. Reproduction occurs during the wet season (May-November). Juvenile recruitment occurs during the dry season (December-April). The objective of this dissertation is to study the east Florida breeding population in the freshwater tributaries of the Indian River Lagoon and focus on: 1) Larval drift to the Gulf Stream and, 2) recruitment of pelagic juveniles from the Gulf Stream onto the freshwater breeding habitat. Pouch released larvae face sharp …
Developmental Taxonomy And Distribution Of Paralarval Squid From The Florida Current, Carrie Leeonne Adams
Developmental Taxonomy And Distribution Of Paralarval Squid From The Florida Current, Carrie Leeonne Adams
Theses and Dissertations
Distribution patterns of paralarval squid across the continental shelf of Florida were examined based on five years of collections. Squid occurrence patterns were described in relation to coastal, intermediate, and Florida Current (Gulf Stream) water masses by comparing horizontal and vertical distribution patterns of squid species to physical-chemical distribution patterns Twenty-six squid taxa were collected in this study. Representative taxonomic descriptions and illustrations of all taxa were produced to serve as an identification aid for the paralarval squid from the Florida shelf. Patterns of species composition among stations were analyzed with cluster analysis based on four sampling approaches. Species distribution …