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  • Ecology  (3)
  • Chemistry  (2)
  • EARTH RESOURCES AND REMOTE SENSING
  • GEOPHYSICS
  • METEOROLOGY AND CLIMATOLOGY
  • Mice
  • 2020-2022  (4)
  • 1
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    Age, growth, mortality, and radiometric age validation of gray snapper (Lutjanus griseus) from Louisiana (2021)
    In:  http://aquaticcommons.org/id/eprint/9616 | 403 | 2012-08-04 18:21:17 | 9616 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-07
    Description: The gray snapper (Lutjanus griseus) is a temperate and tropical reef fish that is found along the Gulf of Mexico and Atlantic coasts of the southeastern United States. The recreational fishery for gray snapper has developed rapidly in south Louisiana with the advent of harvest and seasonalrestrictions on the established red snapper (L. campechanus) fishery. We examined the age and growth ofgray snapper in Louisiana with the use of cross-sectioned sagittae. A total of 833 specimens, (441 males, 387females, and 5 of unknown sex) were opportunistically sampled from the recreational fishery from August 1998 to August 2002. Males ranged in size from 222 to 732 mm total length (TL) and from 280 g to 5700 g total weight (TW) and females ranged from 254 to 756 mm TL and from 340 g to 5800 g TW. Both edge analysis and bomb radiocarbon analyses were used to validate otolith-based age estimates. Ages were estimated for 718 individuals; both males and females rangedfrom 1 to 28 years. The von Bertalanffy growth models derived from TL at age were Lt = 655.4{1–e[–0.23(t)]}for males, Lt = 657.3{1–e[– 0.21(t)]} for females, and L t = 656.4{1–e[– 0.22 (t)]} for all specimens of known sex. Catch curves were used to produce a total mortality (Z) estimate of 0.17. Estimates of M calculated with variousmethods ranged from 0.15 to 0.50; however we felt that M= 0.15 was the most appropriate estimate based on our estimate of Z. Full recruitment to the gray snapper recreational fishery began at age 4, was completed by age8, and there was no discernible peak in the catch curve dome.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 307-319
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  • 2
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    Spatial mapping of sedimentary contaminants in the Baltimore Harbor/Patapsco river/Back river system (2021)
    University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/2883 | 130 | 2011-09-29 18:17:42 | 2883 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-29
    Description: Primary objective was to map concentrations of target contaminants in the surfacial sediments. Secondary objectives included: characterization of potential sites for sediment capping demonstration projects, further characterization of sediment depositional and accumulation patterns, and estimation of historical contaminant inventories through sediment geochronology. (PDF contains 112 pages)
    Description: Maryland Department of the Environment
    Keywords: Ecology ; Pollution ; Environment ; Chemistry ; Polychlorinated biphenyls ; Polycyclic aromatic hydrocarbons ; organochlorine pesticides ; Mercury ; Methylmercury ; Nitrogen ; Sulfur ; Trace metals ; toxic effects ; Chesapeake Bay ; Baltimore Harbor ; Patapsco river ; Back river ; Maryland ; carbon ; PCB ; Cadmium ; Chromium ; Nickel ; Copper ; Zinc
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 3
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    Growth rates of bacteria in rivers (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5184 | 3949 | 2011-09-29 15:17:22 | 5184 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: Three different methods for determining bacterial growth rate in rivers are described. Two of the methods are for bacteria in suspension: a recirculating experimental channel method and a radioactive tracer technique using super(35)SO sub(4). The third method is for bacteria attached to surfaces and specifically considers the surface of the common duckweed Lemna minor).
    Keywords: Biology ; Ecology ; Bacteria ; Growth ; Nannoplankton ; Rivers ; Lemna minor ; England ; Dorset ; River Frome ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
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  • 4
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    PCB desorption kinetics under realistic shear and turbulence [progress report] (2021)
    University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/19005 | 130 | 2015-12-01 18:48:40 | 19005 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-13
    Description: We hypothesize that the impact of PCB desorption from resuspended sediments depends upon the intensity of the resuspension (which scales to bottom stress in the absence of organisms), the rate at which each congener desorbs (which depends on the size and hydrophobicity of the chemical, the relative amount of 'labile' and 'resistant' forms, and the size distribution of the suspended particles), and the residence time of the particles in the water column (which depends on the time-variable water column turbulence regime and the particle settling velocities). In order to accurately quantify the impact of PCB desorption from Hudson River sediments, we are conducting experiments that realistically mimic bottom shear stress and water column turbulence and rapidly measure PCB congener release. The objectives of this study are to measure the kinetics of PCB congener desorption from Hudson River sediments under realistic bottom shear and water column turbulence conditions and to quantify the impact of shear stress and contaminant aging on PCB desorption kinetics.
    Description: Hudson River Foundation
    Description: Ref. No. [UMCES] CBL 004-018
    Keywords: Chemistry ; Environment ; Pollution
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 6
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