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  • 1
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    Characterization of Hypoxia: Topic I Report for the Integrated Assessment on Hypoxia in the Gulf of Mexico (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14643 | 403 | 2014-02-24 00:12:08 | 14643 | United States National Ocean Service
    Details
    Publication Date: 2021-06-30
    Description: Nutrient overenrichment from human activities is one of the major stresses affecting coastal ecosystems. There is increasing concern in many areas around the world that an oversupply of nutrients from multiple sources is having pervasive ecological effects on shallow coastal and estuarine areas. These effects include reduced light penetration, loss of aquatic habitat, harmfid algal blooms, a decrease in dissolved oxygen (or hypoxia), and impacts on living resources. The largest zone of oxygen-depleted coastal waters in the United States, and the entire western Atlantic Ocean, is found in the northern Gulf of Mexico on the Louisiana-Texas continental shelf. This zone is influenced by the freshwater discharge and nutrient flux of the Mississippi River system.This report describes the seasonal, interannual, and long-term variability in hypoxia in the northern Gulf of Mexico and its relationship to nutrient loading. It also documents the relative roles of natural and human-induced factors in determining the size and duration of the hypoxic zone.
    Keywords: Ecology ; Environment ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 167
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  • 2
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    Hydrographic, biological, and nutrient characteristics of the water column in the Mississippi River Delta Bight, June, 1985 to December, 1985 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/26966 | 30 | 2020-02-21 19:30:30 | 26966 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: In June 1985, a focused study was initiated to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Hypoxic bottom waters were studied along two transects (one off Cat Island Pass near Cocodrie and one off Belle Pass off Port Fourchon) in the Mississippi River Delta Bight area. Eight 2-day cruises were conducted aboard the R/V R.J. Russell or the R/V Pelican along these two transects between mid-June and mid-October. Sampling was most intense (bi-weekly) from mid-June through early September. A reduced sampling scheme (4 stations along the Cat Island Pass transect) was continued through the end of the year. In addition, two shelf-wide cruises were conducted from the Mississippi River to the Texas border during July and September.
    Description: Related data report: http://aquaticcommons.org/26970/
    Keywords: Oceanography ; Gulf of Mexico ; hypoxia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 146
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  • 3
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    Hydrographic, biological, and nutrient characteristics of the water column on the Louisiana shelf, July and September, 1985 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/26970 | 30 | 2020-02-21 19:32:14 | 26970 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: In June 1985, a focused study was initiated to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Two shelf-wide, quasi-synoptic cruises were conducted from the Mississippi River to the Texas border during mid-July and early September, 1985. Cruises were conducted aboard the R/V Pelican on 15-20 July and 10-13 September. Stations were occupied along ten transects in 5 to 80 m water depth. Stations for Pelican Cruise I extended farther offshore and farther to the west than those for Pelican Cruise II. In addition to these shelf-wide cruises, hypoxic bottom waters were studied more frequently along two transects in the Mississippi River Delta Bight area.
    Description: Related data report: http://aquaticcommons.org/26966/
    Keywords: Oceanography ; Gulf of Mexico ; hypoxia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 150
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  • 4
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    Hydrographic, biological, and nutrient characteristics of the water column on the southeastern Louisiana coast, January, 1986 to November, 1986 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/26995 | 30 | 2020-02-28 19:12:07 | 26995 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: In June 1985, a focused study was initiated to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Hypoxic bottom waters were studied along two transects (one off Cat Island Pass near Cocodrie and one off Belle Pass near Port Fourchon). The number of transects was reduced to one in 1986 (Transect C off Cat Island Pass) and the number of sample periods increased. Sixteen cruises were conducted aboard the R/V Acadiana or the R/V Pelican between late January and mid-November, 1986. Sampling was most intense (bi-weekly) from mid-April through late September. A reduced sampling scheme (four stations) was followed for the first two cruises. In addition a shelf-wide cruise was conducted from the Mississippi River to the Texas border during July, 1986.
    Description: Related data report: http://aquaticcommons.org/26996/
    Keywords: Oceanography ; hypoxia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 162
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  • 5
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    Hydrographic, biological, and nutrient characteristics of the water column on the Louisiana shelf, July, 1986 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/26996 | 30 | 2020-02-28 19:09:46 | 26996 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: In June 1985, a focused study was initiated to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Hypoxic bottom waters were studied along two transects (one off Cat Island Pass near Cocodrie and one off Belle Pass near Port Fourchon). These cruises were continued in 1986 but on a single transect (see LUMCON Data Report No. 6). In addition, a shelf-wide cruise was conducted from the Mississippi River to the Texas border during July, 1986. Stations occupied during this cruise were similar to those sampled during shelf-wide cruises in 1985. The intent of these cruises was to provide comparative information on the temporal variability of oxygen-depleted bottom waters on the Louisiana shelf.The first part of the cruise was conducted on the R/V Acadiana between July 7 and July 10. Rough seas prevented continuation on the smaller ship. The remaining stations were sampled from on board the R/V Pelican between July 16 and July 17. While not synoptic in coverage, a few mid-depth stations were reoccupied during the second leg and hydrographic conditions were similar on the two dates.
    Description: Related data report: http://aquaticcommons.org/26995/
    Keywords: Oceanography ; hypoxia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 107
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  • 6
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    Hydrographic, biological, and nutrient characteristics of the water column on the Louisiana shelf during 1988 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/27003 | 30 | 2020-03-05 18:38:41 | 27003 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: Since 1985, several research cruises were conducted by our research team to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Hypoxic bottom waters were studied along two transects in and near the Mississippi River Delta Bight in 1985 and 1986. In addition, shelf-wide cruises were conducted from the Mississippi River to the Texas border during July of 1985, 1986, and 1987. These cruises have provided us with exhaustive information concerning the temporal and spatial variability associated with the phenomenon of hypoxia on the Louisiana shelf. It was not our intent to continue assessment-type cruises during 1988. Opportunities existed, however, in conjunction with other research cruises and the LUMCON summer program to re-occupy stations along Transect C off Cat Island Pass near Cocodrie. In addition, the drought conditions in the upper Mississippi River basin during the spring and summer of 1988 resulted in a significant reduction in the flow rate of the Mississippi River. We were therefore compelled to conduct a shelf-wide cruise during mid-summer of 1988 to document the hydrographic conditions of the Louisiana shelf under low flow conditions of the Mississippi River and to assess the effects of this low flow on the phenomenon of hypoxia.The cruises along Transect C were conducted on board the R/V Pelican as part of a research effort named LaSER for data in April and as part of the LUMCON summer program for the remainder. The shelf-wide cruise was conducted on board the R/V Acadiana from August 12 through August 16, 1988.
    Keywords: Oceanography
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 112
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  • 7
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    Hydrographic, biological, and nutrient characteristics of the water column on the Louisiana shelf, July, 1987 (2021)
    Louisiana Universities Marine Consortium | Chauvin, LA
    In:  http://aquaticcommons.org/id/eprint/27002 | 30 | 2020-03-05 18:35:01 | 27002 | Louisiana Universities Marine Consortium (LUMCON)
    Details
    Publication Date: 2021-07-24
    Description: Beginning in 1985, several research cruises were conducted by our research team to assess the spatial and temporal extent, intensity, and potential causes of oxygen depletion in the northern Gulf of Mexico. Hypoxic bottom waters were studied along two transects in and near the Mississippi River Delta Bight in 1985 and 1986. In addition, shelf-wide cruises were conducted from the Mississippi River to the Texas border during July of both years. The intent of these cruises was to provide comparative information on the temporal variability of oxygen-depleted bottom waters on the Louisiana shelf.The bi-weekly cruises along the southeastern Louisiana shelf were discontinued in 1987. A shelf-wide cruise, however, was conducted in July, 1987 to continue the studies of temporal variability on the Louisiana shelf. The cruise was conducted on the R/V Pelican from July 1 through July 5.
    Keywords: Oceanography ; hypoxia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 110
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  • 8
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    Soil Shear Strength Losses in Two Fresh Marshes with Variable Increases in N and P Loading (2020)
    Springer
    Details
    Publication Date: 2020-01-24
    Description: We measured soil shear strength (SSS) from 2009 to 2018 in two hydrologically distinct freshwater marshes dominated by Panicum hemitomon after nitrogen (N) and phosphorous (P) were applied to the surface in spring. The SSS averaged over 100-cm depth in the floating and anchored marshes declined up to 30% throughout the profiles and with no apparent differences in the effects of the low, medium, and high N + P dosing. Plots with only N or P additions exhibited significant changes in SSS at individual depths below 40 cm for the anchored marsh, but not the floating marsh. The average SSS for the anchored marsh over the entire 100 cm profile declined when N and P were added separately or together. At the floating marsh, however, the SSS decreased when N and P were added in combination, or P alone, but not for the N addition. Increasing nutrient availability to these freshwater marsh soils makes them weaker, and perhaps lost if eroded or uplifted by buoyant forces during storms. These results are consistent with results from multi-year experiments demonstrating higher decomposition rates, greenhouse gas emissions, and carbon losses in wetlands following increased nutrient availability.
    Print ISSN: 0277-5212
    Electronic ISSN: 1943-6246
    Topics: Biology
    Published by Springer
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  • 9
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    The resilience of coastal marshes to hurricanes: The potential impact of excess nutrients (2020)
    Elsevier
    Details
    Publication Date: 2020-05-01
    Print ISSN: 0160-4120
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 10
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    Effects of Mississippi River water on phytoplankton growth and composition in the upper Barataria estuary, Louisiana (2020)
    Springer
    Details
    Publication Date: 2020-03-03
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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