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  • Dredging  (2)
  • Gulf of Mexico  (2)
  • Botanical nomenclature  (1)
  • 1
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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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  • 2
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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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  • 3
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    Supporting Spartina: Interdisciplinary perspective shows spartina as a distinct solid genus (2019)
    Ecological Society of America
    Details
    Publication Date: 2022-10-27
    Description: Author Posting. © Ecological Society of America, 2019. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecology (2019): e02863, doi:10.1002/ecy.2863.
    Description: In 2014, a DNA‐based phylogenetic study confirming the paraphyly of the grass subtribe Sporobolinae proposed the creation of a large monophyletic genus Sporobolus, including (among others) species previously included in the genera Spartina, Calamovilfa, and Sporobolus. Spartina species have contributed substantially (and continue contributing) to our knowledge in multiple disciplines, including ecology, evolutionary biology, molecular biology, biogeography, experimental ecology, biological invasions, environmental management, restoration ecology, history, economics, and sociology. There is no rationale so compelling to subsume the name Spartina as a subgenus that could rival the striking, global iconic history and use of the name Spartina for over 200 yr. We do not agree with the subjective arguments underlying the proposal to change Spartina to Sporobolus. We understand the importance of both the objective phylogenetic insights and of the subjective formalized nomenclature and hope that by opening this debate we will encourage positive feedback that will strengthen taxonomic decisions with an interdisciplinary perspective. We consider that the strongly distinct, monophyletic clade Spartina should simply and efficiently be treated as the genus Spartina.
    Description: We are grateful to the many colleagues, students and eight anonymous expert taxonomists from Argentina, United States, Spain, UK, and Uruguay for sharing their opinions, perspectives, and ideas, improving our reasoning and encouraging us to initiate this debate. The authors’ positions are personal, and do not necessarily reflect the organizations or networks they represent or with which they are affiliated. We are also deeply grateful to two anonymous reviewers as well as to the Editor‐in‐Chief Don Strong who supplied excellent insight that truly improved our work.
    Keywords: Botanical nomenclature ; Coastal ecology ; Cordgrass ; Integrative analysis ; Interdisciplinary decisions ; Salt marsh
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
    Electronic Resource
    Electronic Resource
    Backfilling canals to mitigate Wetland dredging in Louisiana coastal marshes (1987)
    Springer
    Environmental management 11 (1987), S. 823-836 
    Details
    ISSN: 1432-1009
    Keywords: Backfilling ; Mitigation ; Wetlands ; Louisiana ; Dredging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Returning canal spoil banks into canals, or backfilling, is used in Louisiana marshes to mitigate damage caused by dredging for oil and gas extraction. We evaluated 33 canals backfilled through July 1984 to assess the success of habitat restoration. We determined restoration success by examining canal depth, vegetation recolonization, and regraded spoil bank soils after backfilling. Restoration success depended on: marsh type, canal location, canal age, marsh soil characteristics, the presence or absence of a plug at the canal mouth, whether mitigation was on- or off-site, and dredge operator performance. Backfilling reduced median canal depth from 2.4 to 1.1 m, restored marsh vegetation on the backfilled spoil bank, but did not restore emergent marsh vegetation in the canal because of the lack of sufficient spoil material to fill the canal and time. Median percentage of cover of marsh vegetation on the canal spoil banks was 51.6%. Median percentage of cover in the canal was 0.7%. The organic matter and water content of spoil bank soils were restored to values intermediate between spoil bank levels and predredging marsh conditions. The average percentage of cover of marsh vegetation on backfilled spoil banks was highest in intermediate marshes (68.6%) and lowest in fresh (34.7%) and salt marshes (33.9%). Average canal depth was greatest in intermediate marshes (1.50 m) and least in fresh marshes (0.85 m). Canals backfilled in the Chenier Plain of western Louisiana were shallower (average depth = 0.61 m) than in the eastern Deltaic Plain (mean depth range = 1.08 to 1.30 m), probably because of differences in sediment type, lower subsidence rate, and lower tidal exchange in the Chenier Plain. Canals backfilled in marshes with more organic soils were deeper, probably as a result of greater loss of spoil volume caused by oxidation of soil organic matter. Canals ten or more years old at the time of backfilling had shallower depths after backfilling. Depths varied widely among canals backfilled within ten years of dredging. Canal size showed no relationship to canal depth or amount of vegetation reestablished. Plugged canals contained more marsh reestablished in the canal and much greater chance of colonization by submerged aquatic vegetation compared with unplugged canals. Dredge operator skill was important in leveling spoil banks to allow vegetation reestablishment. Wide variation in dredge performance led to differing success of vegetation restoration. Complete reestablishment of the vegetation was not a necessary condition for successful restoration. In addition to providing vegetation reestablishment, backfilling canals resulted in shallow water areas with higher habitat value for benthos, fish, and waterfowl than unfilled canals. Spoil bank removal also may help restore water flow patterns over the marsh surface. Increased backfilling for wetland mitigation and restoration is recommended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01867248
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  • 5
    Electronic Resource
    Electronic Resource
    A rationale for coastal wetland restoration through spoil bank management in Louisiana, USA (1994)
    Springer
    Environmental management 18 (1994), S. 271-282 
    Details
    ISSN: 1432-1009
    Keywords: Wetland ; Restoration ; Dredging ; Spoil ; Louisiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The rationale and outline of an implementation plan for restoring coastal wetlands in Louisiana is presented. The rationale for the plan is based on reversing the consequences of documented cause-and-effect relationships between wetland loss and hydrologic change. The main feature is to modify the extensive interlocking network of dredged spoil deposits, or spoil banks, by reestablishing a more natural water flow at moderate flow velocity (〈5 cm/sec). Guidelines for site selection from thousands of potential sites are proposed. Examples of suitable sites are given for intermediate marshes. These sites exhibit rapid deterioration following partial or complete hydrologic impoundment, implying a strong hydrologic, rather than sedimentological, cause of wetland deterioration. We used an exploratory hydrologic model to guide determination of the amount of spoil bank to be removed. The results from an economic model indicated a very effective cost-benefit ratio. Both models and practical experience with other types of restoration plans, in Louisiana and elsewhere, exhibit an economy of scale, wherein larger projects are more cost effective than smaller projects. However, in contrast to these other projects, spoil bank management may be 100 to 1000 times more cost effective and useful in wetland tracts 〈1000 ha in size. Modest spoil bank management at numerous small wetland sites appears to offer substantial positive attributes compared to alternative and more intensive management at a few larger wetland sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02393768
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