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Full-Text Articles in Physical Sciences and Mathematics
Planktonic Foraminifera Collected By The R/V Melville (1972) In The Southwest Atlantic, Haydee Lena, Silvia Watanabe, Sara Souto
Planktonic Foraminifera Collected By The R/V Melville (1972) In The Southwest Atlantic, Haydee Lena, Silvia Watanabe, Sara Souto
Ocean Engineering and Marine Sciences Faculty Publications
The planktonic foraminiferal fauna was studied from 186 samples collected by the R/V Melville in the Southwest Atlantic Ocean during 1972. The samples were collected in the surface layer (horizontal tows) and throughout the water column from 500-0 m. (vertical tows). Twenty species were recognized (some with various formae). These species can be divided according to their temperature requirements into cold-temperate, warm-temperate, warm and cosmopolitan species. Based on the distribution of these species, 4 types of surface water were determined.
Selected Trace Metals In The Upper St. Johns River And Their Land Use Relationships, Jeffrey A. Leed, Thomas V. Belanger
Selected Trace Metals In The Upper St. Johns River And Their Land Use Relationships, Jeffrey A. Leed, Thomas V. Belanger
Ocean Engineering and Marine Sciences Faculty Publications
Iron, copper and zinc were monitored in the water, sediments, and 4 species of fish of the upper St. Johns River, Florida. Surface water concentrations of total iron commonly exceeded 300 ug/l, the standard established by the Florida Department of Environmental Regulation for waters intended for public consumption (Class I waters). Total iron levels in the upper St. Johns River are regulated by a series of interacting natural processes such as the ironphosphate cycle, inputs from nonartesian groundwater or bank seepage, complexation with dissolved organic compounds, increased land runoff during perids of high flow, and resuspension of bottom sediments during …
Infrared Absorption Study Of Humic Substances From Lake Apopka Sediment, Plankton And The Surrounding Drainage Basin, Thomas V. Belanger
Infrared Absorption Study Of Humic Substances From Lake Apopka Sediment, Plankton And The Surrounding Drainage Basin, Thomas V. Belanger
Ocean Engineering and Marine Sciences Faculty Publications
Infrared absorption spectra were run on humic substances from Lake Apopka sediment samples and compared with spectra from citrus and muck farm humic substances from sediment in the surrounding drainage basin, and also with spectra from autochthonous plankton humic substances. The 1540 cm'1 and 1650 cm' 1 peaks in the plankton and lake sediment samples, in addition to other spectra similarities, indicate that plankton is the probable precursor of lake sediment humic substances. The absorption bands at 1650 cm 1 and 1540 cm 1 are thought to be due to peptide bonds in protein, with amide I absorption occurring at …
Comparison Of Benthic Oxygen Demand Measurement Techniques, Thomas V. Belanger
Comparison Of Benthic Oxygen Demand Measurement Techniques, Thomas V. Belanger
Ocean Engineering and Marine Sciences Faculty Publications
Several common methods to measure benthic oxygen demand were compared using measured and literature data. An in situ respirometer technique, a laboratory core-uptake technique and a laboratory flow-through system technique were compared on sand and organic sediment in Lake Washington, Florida. In situ uptake rates were significantly higher than core uptake rates, and this difference was greater for highly organic sediment than sand sediment. Measured and literature uptake values for in situ respirometer and core-uptake techniques with organic sediment were compared and resulted in a relationship (r = .99; P< .01) of the form: in situ uptake (g 2/m 2-hr) = .036 + 1.16 core uptake (g 2/m 2-hr). In many cases both coreuptake and in situ respirometer techniques under estimate oxygen consumption, due to difficulties in obtaining correct water velocities over the sediment surface. In the flow-through system studies, sediment oxygen uptake varied considerably with flow rate and a significant logarithmic relationship (P<.01) was obtained with Lake Apopka, Florida organic sediment. Measurement techniques that simulate field flows are the most accurate, such as the flow through system or the in situ tunnel respirometer technique.