Diversity and distribution patterns of macrofauna polychaetes (Annelida) in deep waters of the Southwestern Gulf of Mexico

2022 ◽  
pp. 103699
Author(s):  
Octavio Quintanar-Retama ◽  
Maickel Armenteros ◽  
Adolfo Gracia
Keyword(s):  
Gulf Of Mexico ◽  
Distribution Patterns ◽  
Deep Waters

New Oceanographic Observations of the Gulf of Mexico Deep Waters

2001 ◽  
pp. 229-240
Author(s):  
Alexis Lugo-Fernandez ◽  
Peter Hamilton ◽  
Walter R. Johnson
Keyword(s):  
Gulf Of Mexico ◽  
Deep Waters

Beach vegetation and plant distribution patterns along the northern Gulf of Mexico

1987 ◽  
Vol 15 (2) ◽  
pp. 201-233 ◽  
Author(s):  
M.G. Barbour ◽  
M. Rejmanek ◽  
A. F. Johnson ◽  
B. M. Pavlik
Keyword(s):  
Gulf Of Mexico ◽  
Distribution Patterns ◽  
Plant Distribution ◽  
Northern Gulf Of Mexico ◽  
Beach Vegetation ◽  
Plant Distribution Patterns

Motion Comparison Between a Conventional Deep Draft Semi-Submersible and a Dry Tree Semi-Submersible

2009 ◽  
Author(s):  
Anis Hussain ◽  
Edwin Nah ◽  
Rain Fu ◽  
Apurva Gupta
Keyword(s):  
Gulf Of Mexico ◽  
Model Test ◽  
Significant Influence ◽  
Extreme Environments ◽  
Test Results ◽  
Numerical Computations ◽  
Deep Waters ◽  
Second Tier ◽  
Motion Characteristics ◽  
Heave Motion

One of the major requirements for a floating vessel designed to support top tensioned risers is to have the heave response within a minimum specified range in extreme environments. The heave has a significant influence on the riser stroke. Usually floater designs aim to use conventional riser tensioners, available commercially, which typically have a maximum stroke range in the order of 30 to 35ft. One of the limitations of traditional Semi-submersible designs to support dry trees is that the heave ranges seen in central Gulf of Mexico (GoM) are outside the range that can apply a conventional tensioner. The Extendable Semi-submersible (E-Semi) utilizes a retractable Second Tier Pontoon (STP) to suppress heave motions and reduce its heave motion in order to support top tensioned risers in central GoM ultra deep waters. The design is based on an established deep draft Semi-submersible with the STP attached. This paper presents a comparison between motion characteristics of the deep draft Semi-submersible with and without the STP attached. The comparison is based on numerical computations to predict the responses together with model test results in the same environments. The analysis essentially shows the effectiveness of the STP is suppressing the heave motion.

scholarly journals Seasonal Mixing and Biological Controls of the Carbonate System in a River-Dominated Continental Shelf Subject to Eutrophication and Hypoxia in the Northern Gulf of Mexico

2021 ◽  
Vol 8 ◽  
Author(s):  
Wei-Jen Huang ◽  
Wei-Jun Cai ◽  
Xinping Hu
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Dissolved Inorganic Carbon ◽  
Time Lag ◽  
Distribution Patterns ◽  
Detailed Examination ◽  
Total Alkalinity ◽  
Dominant Factor ◽  
Near Surface ◽  
Northern Gulf Of Mexico

Large rivers export a large amount of dissolved inorganic carbon (DIC) and nutrients to continental shelves; and subsequent river-to-sea mixing, eutrophication, and seasonal hypoxia (dissolved oxygen < 2 mg⋅L–1) can further modify DIC and nutrient distributions and fluxes. However, quantitative studies of seasonal carbonate variations on shelves are still insufficient. We collected total alkalinity (TA), DIC, and NO3– data from nine cruises conducted between 2006 and 2010 on the northern Gulf of Mexico continental shelf, an area strongly influenced by the Mississippi and Atchafalaya Rivers. We applied a three-end-member model (based on salinity and potential alkalinity) to our data to remove the contribution of physical mixing to DIC and nitrate distribution patterns and to derive the net in situ removal of DIC and nitrate (ΔDIC and ΔNO3–, respectively). Systematic analyses demonstrated that the seasonal net DIC removal in the near-surface water was strong during summer and weak in winter. The peak in net DIC production in the near-bottom, subsurface waters of the inner and middle sections of the shelf occurred between July and September; it was coupled, but with a time lag, to the peak in the net DIC removal that occurred in the near-surface waters in June. A similar 2-month delay (i.e., January vs. November) could also be observed between their minima. A detailed examination of the relationship between ΔDIC and ΔNO3– demonstrates that net biological activity was the dominant factor of DIC removal and addition. Other effects, such as air–sea CO2 gas exchange, wetland exports, CaCO3 precipitation, and a regional variation of the Redfield ratio, were relatively minor. We suggest that the delayed coupling between eutrophic surface and hypoxic bottom waters reported here may also be seen in the carbon and nutrient cycles of other nutrient-rich, river-dominated ocean margins worldwide.

scholarly journals Systematics of ‘lithistid’ tetractinellid demosponges from the Tropical Western Atlantic—implications for phylodiversity and bathymetric distribution

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10775
Author(s):  
Astrid Schuster ◽  
Shirley A. Pomponi ◽  
Andrzej Pisera ◽  
Paco Cárdenas ◽  
Michelle Kelly ◽  
...  
Keyword(s):  
Distribution Patterns ◽  
Morphological Data ◽  
Integrative Approach ◽  
Bathymetric Distribution ◽  
The Bahamas ◽  
Western Atlantic ◽  
Deep Waters ◽  
The Pacific ◽  
Phylogenetic Affinities ◽  
First Time

Background Among all present demosponges, lithistids represent a polyphyletic group with exceptionally well-preserved fossils dating back to the Cambrian. Knowledge of their recent diversity, particularly in the Tropical Western Atlantic Ocean (TWA) where they are common in deep waters, is scarce making any comparison between present and past major ‘lithistid’ faunas difficult. In addition, the lack of sufficient molecular and morphological data hamper any predictions on phylogenetic relationships or phylodiversity from this region. The Harbor Branch Oceanographic Institute (HBOI, Fort Pierce, Florida) holds the largest collection of TWA lithistid sponges worldwide, however, the majority remain to be taxonomically identified and revised. Principal Findings In this study we provide sequences of 249 lithistid demosponges using two independent molecular markers (28S rDNA (C1-D2) and cox1 mtDNA). In addition, a morphological documentation of 70 lithistid specimens is provided in the database of the Sponge Barcoding Project (SBP). This integrated dataset represents the largest and most comprehensive of the TWA lithistids to date. The phylogenetic diversity of ‘lithistid’ demosponges in the Bahamas and Jamaica are high in comparison to other TWA regions; Theonellidae and Corallistidae dominate the fauna, while Neopeltidae and Macandrewiidae are rare. A proposed tetractinellid suborder, one undescribed genus and several undescribed species are recognized and the Pacific ‘lithistid’ genera, Herengeria and Awhiowhio, are reported from the TWA for the first time. The higher-taxa relationships of desma-bearing tetractinellids are discussed and topics for revision suggested. Conclusion This first integrative approach of TWA ‘lithistid’ demosponges contributes to a better understanding of their phylogenetic affinities, diversity and bathymetric distribution patterns within the TWA. As in the Pacific, the TWA ‘lithistid’ demosponges dominate deep-water habitats. Deeper taxonomic investigations will undoubtedly contribute to a better comparison between present major ‘lithistid’ faunas and their fossil record in the Mesozoic.

scholarly journals Connectivity of deep waters in the Gulf of Mexico

2020 ◽  
Vol 203 ◽  
pp. 103267 ◽  
Author(s):  
Aljaz Maslo ◽  
Joao Marcos Azevedo Correia de Souza ◽  
Fernando Andrade-Canto ◽  
Javier Rodríguez Outerelo
Keyword(s):  
Gulf Of Mexico ◽  
Deep Waters
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