scholarly journals Denitrification pathways and rates in the sandy sediments of the Georgia continental shelf, USA

1999 ◽  
Vol 6 (1) ◽  
pp. 12 ◽  
Author(s):  
Cynthia Vance-Harris
Keyword(s):  
Continental Shelf ◽  
Sandy Sediments

Recent Benthic Foraminifers from the South Atlantic Shelf of Argentina

2018 ◽  
Vol 48 (3) ◽  
pp. 210-222 ◽  
Author(s):  
Emiliana Bernasconi ◽  
Mario Mansilla ◽  
Gabriela Cusminsky
Keyword(s):  
Continental Shelf ◽  
Physicochemical Parameters ◽  
Multivariate Analyses ◽  
Temperature Zone ◽  
Free Living ◽  
Benthic Foraminifers ◽  
Zone Ii ◽  
Recent Sediments ◽  
Sandy Sediments ◽  
Saline Zone

Abstract The aim of this study was to determine foraminiferal associations from recent sediments of Argentina's continental shelf (39–41ºS, 59–61ºW; 11–70 m) and assess their relationship to physicochemical parameters. From 20 samples, all dominated by sandy sediments (>80% sand), 44 species of foraminifers were identified, most commonly Buccella peruviana. Recovered foraminiferal tests were generally well preserved, with morphologies indicating predominantly epifaunal, free-living detritivores from well-oxygenated waters. Multivariate analyses showed a strong correlation between foraminiferal assemblages and four zones related to physicochemical parameters. Zone I included the offshore samples from depths of 40–70 m where waters were slightly colder and more saline. Zone II samples were all collected from depths of 30–40 m that were intermediate in temperature. Zone III occurred at 20–40 m depth where sediments were characterized by some gravel content. Zone IV included the inshore sites (<20 m) offshore from the Rio Colorado delta. This work contributes to the knowledge of foraminifers on Argentina's continental shelf, complementing earlier studies of foraminiferal distributions and ecology from the region.

Distribution and Characteristics of Sandy Sediments along the Northeastern Continental Shelf of Korea in the East Sea

2020 ◽  
Vol 95 (sp1) ◽  
pp. 532
Author(s):  
So-Ra Kim ◽  
Jong-Hwa Chun ◽  
In-Kwon Um ◽  
Deniz Cukur
Keyword(s):  
Continental Shelf ◽  
East Sea ◽  
Sandy Sediments

scholarly journals Using a Thermal Proxy to Examine Sediment–Water Exchange in Mid-Continental Shelf Sandy Sediments

2016 ◽  
Vol 22 (5-6) ◽  
pp. 419-441 ◽  
Author(s):  
William B. Savidge ◽  
Alicia Wilson ◽  
Gwendolyn Woodward
Keyword(s):  
Continental Shelf ◽  
Water Exchange ◽  
Sandy Sediments

Isotopic characterization of lifetime movement by two demersal fishes from the northeastern Gulf of Mexico

2021 ◽  
Vol 657 ◽  
pp. 161-172
Author(s):  
JL Vecchio ◽  
JL Ostroff ◽  
EB Peebles
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Life Histories ◽  
Linear Mixed Model ◽  
Trophic Position ◽  
Eye Lens ◽  
Outer Continental Shelf ◽  
Red Grouper ◽  
Lens Diameter ◽  
Isotopic Characterization

An understanding of lifetime trophic changes and ontogenetic habitat shifts is essential to the preservation of marine fish species. We used carbon and nitrogen stable isotope values (δ13C and δ15N) recorded within the laminar structure of fish eye lenses, reflecting both diet and location over time, to compare the lifetime trends of 2 demersal mesopredators. Tilefish Lopholatilus chamaeleonticeps inhabit burrows on the outer continental shelf, which results in exceptional site fidelity. Red grouper Epinephelus morio are spawned on the middle to outer continental shelf, move to the inner shelf for the juvenile period, and return offshore upon sexual maturity. Both species inhabit the eastern Gulf of Mexico, a region with a distinctive offshore-inshore gradient in background δ13C values. Within individual tilefish (n = 36), sequences of δ13C values and δ15N values had strong, positive correlations with eye-lens diameter, and strong correlations between the 2 isotopes (mean Spearman r = 0.86), reflecting an increase in trophic position with growth and little lifetime movement. In red grouper (n = 30), δ15N values positively correlated with eye-lens diameter, but correlations between δ15N and δ13C were weak (mean Spearman r = 0.29), suggesting cross-shelf ontogenetic movements. Linear mixed model results indicated strong relationships between δ15N and δ13C values in tilefish eye lenses but no convergence in the red grouper model. Collectively, these results are consistent with previously established differences in the life histories of the 2 species, demonstrating the potential utility of eye-lens isotope records, particularly for investigating the life histories of lesser-known species.

Hoạt động kiến tạo vỡ núi lửa trẻ (Pliocen - Đệ tứ) thềm lục địa nam Việt Nam (Theo số liệu địa vật lý)

2008 ◽  
Vol 30 (4) ◽  
pp. 289-301
Author(s):  
Phạm Năng Vũ ◽  
Phạm Nguyễn Hà Vũ ◽  
Nguyễn Xuân Bình
Keyword(s):  
Continental Shelf ◽  
Viet Nam ◽  
Volcanic Activities

Young and recent tectonic and volcanic activities in the Southern continental shelf of Vietnam

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