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100 results for “South Atlantic Bight”
Seasonal Distribution of Ammonia-Oxidizing Archaea and Ammonia-Oxidation Rates in the South Atlantic Bight from April to November 2014
Previous work in nearshore waters of the Georgia USA coast has demonstrated mid-summer peaks in the abundance of Thaumarchaeota (blooms with 100 to 1,000-fold increases) accompanied by spikes in nitrite concentration. These studies were performed at one location, so the areal extent of the bloom is unknown, nor has it been demonstrated conclusively that it develops in inshore waters. We collected data on rates of ammonia oxidation and the distribution of Thaumarchaeota, ammonia-oxidizing Betaproteobacteria (AOB), nitrite-oxidizing Nitrospina and environmental variables during 6 cruises aboard the UNOLS vessel R/V Savannah from April to November 2014 on transects of the South Atlantic Bight to evaluate the areal extent and timing of the bloom. This data set includes measurements of Chlorophyll-a concentration, PAR attenuation coefficient, oxygen concenrations, temperature, salinity and nitogenous nutrient concentrations (nitrite, nitrite + nitrate, ammonium, urea), and estimates of Archaea, bacteria and diatom gene concentration based on quantitative PCR.
Concentrations, turnover rates and fluxes of polyamines in coastal waters of the South Atlantic Bight during April and October 2011
Polyamines are short-chain aliphatic compounds containing multiple amine groups. They are important components of the cytosol of eukaryotes and are present at mmol/L concentrations inside phytoplankton cells, while complex polyamines play a role in biosilica deposition. Concentrations of polyamines measured in seawater are typically in the sub nmol/L range, implying rapid and efficient uptake by osmotrophs, likely bacterioplankton. We measured turnover rates of three polyamines (putrescine, spermidine and spermine) using 3H-labeled compounds and determined their concentrations by HPLC to estimate polyamine contributions to dissolved organic matter and bacterioplankton carbon and nitrogen demand. These measurements were made on transects from the inner shelf to the Gulf Stream across the South Atlantic Bight (SAB) during April and October of 2011 and in salt marsh estuaries on the Georgia coast during August of 2011 and April of 2012. This data set includes measurements of water column variables (temperature, salinity, biogenic Silica), nutrients (nitrite, nitrate+nitrite, ammonium and dissolved inorganic nitrogen), and concentrations and turnover rates of polyamine compounds.
Seasonal Evolution of Terrigenous Dissolved Organic Matter in the South Atlantic Bight off Georgia in 2014
Six surveys of the central South Atlantic Bight (SAB) off of Georgia were conducted in 2014. The primary objective of the research cruises was to characterize estuary-shelf exchange and the dispersal of freshwater into the coastal ocean around Sapelo Island off the Georgia coast. The surveys, in April, May, July, August, September, and November, were intended to sample shelf conditions under different seasons. Most of the sampling stations were located at the mouth of the estu-aries around Sapelo Island and over the inner and mid-shelf (<60 km offshore). Eighty samples from transects extending across the shelf from the mouths of the Altamaha River and of Sapelo Sound were selected for the analyses of molecular composition using ultrahigh resolution mass spectrometry (Fourier transform ion cyclotron reso-nance mass spectrometry [FT-ICR MS]) and stable carbon iso-topic signatures (delta 13C). This data set includes spectral analysis of the DOM, including spectral slope (275-295nm wavelength), terrigenous peaks from mass spectrometry analysis, and a computed terrigenous index indicating fraction of terrigenous DOM in water samples.
FIGURE 1 in Crosniera wennerae, a new species of thalassinidean (Crustacea: Decapoda: Thomassiniidae) from the South Atlantic Bight
FIGURE 1. Crosniera wennerae sp. nov., female holotype, USNM 174403, TL 20 mm: A, lateral view of carapace; B, lateral view of abdomen showing segments 1–6; C, dorsal view of anterior carapace; D, antenna 1; E, major chela (right); F, gastric mill; G, minor chela (left); H, pereopod 3 with enlargement of propodus tip.
FIGURE 4 in Crosniera wennerae, a new species of thalassinidean (Crustacea: Decapoda: Thomassiniidae) from the South Atlantic Bight
FIGURE 4. The distributions of the known species of Crosniera Kensley and Heard (including species 1 and 2 of Poore (1997).
FIGURE 3 in Crosniera wennerae, a new species of thalassinidean (Crustacea: Decapoda: Thomassiniidae) from the South Atlantic Bight
FIGURE 3. Crosniera wennerae sp. nov., female holotype, USNM 174403, TL 20 mm: branchial structures. A, single arthrobranch (third thoracomere); B, reduced podobranch (sixth thoracomere); C, two arthrobranchs (seventh thoracomere); D, epipod with detail of hooked setae at tip (sixth thoracomere); E, reduced epipod (seventh thoracomere).
FIGURE 2 in Crosniera wennerae, a new species of thalassinidean (Crustacea: Decapoda: Thomassiniidae) from the South Atlantic Bight
FIGURE 2. Crosniera wennerae sp. nov., female holotype, USNM 174403, TL 20 mm: A, maxilla 1; B, maxilla 2; C, maxilliped 1; D, enlargement of endopod of maxilliped 3; E, maxilliped 3; F, maxilliped 2; G, sixth abdominal segment with telson and uropods with enlargement of setation of exopod; H, right mandible; I, left mandible (palp missing); J, pleopod 1; K, pleopod 5 (exopod missing).
FIGURE 38 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 38. Leptosynapta tenuis (Ayres, 1851). A, whole animal; B, anchor plate; C, anchor; D, miliary granules.
FIGURE 36 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 36. Epitomapta roseola (Verrill, 1873). A, whole animal; B, anchor; C, anchor plate; D, miliary granules.
FIGURE 35 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 35. Paracaudina chilensis obesacauda (H.L. Clark, 1908). A, whole animal; B, C, crossed cups.
FIGURE 10 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 10. Aslia surinamensis (Semper 1868). A, whole animal; B, button; C, D, cups in top and side view.
FIGURE 7 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 7. Duasmodactyla seguroensis (Deichmann, 1930). A, whole animal; B, table in lateral view; C, table, top view.
FIGURE 19 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 19. Phyllophorus (Urodemella) arenicola Pawson & Miller, 1992. A, whole animal; B, C, D tables in top and oblique views.
FIGURE 6. Some SERTC holothurians. a in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 6. Some SERTC holothurians. a) Pentamera pulcherrima; b) Thyonella pervicax; c) Aslia pygmaea; d) Holothuria princeps; e) Actinopyga agassizii; f) Isostichopus badionotus. Scalebars: a = 1 cm; b,c = 2 cm; d,e,f = 5 cm.
FIGURE 5. Some representative holothurian body wall ossicles. A–E, G–H in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 5. Some representative holothurian body wall ossicles. A–E, G–H, tables viewed from various angles; F, crossed cup; I, perforated rod; J–N, smooth and knobbed buttons; O, cup; P, anchor plate; Q, anchor; R, C-shaped rod; S, wheel. Partly after Hendler et al., 1995.
FIGURE 2. Representative holothurian feeding tentacles. A in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 2. Representative holothurian feeding tentacles. A, shield-shaped (Order Aspidochirotida); B, branching (O. Dendrochirotida); C, pinnate (O. Apodida); D, digitate (O. Apodida, O. Molpadiida); E, digitate (O. Molpadiida).
FIGURE 31 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 31. Holothuria (Semperothuria) surinamensis Ludwig, 1875. A, whole animal; B, C, D, tables in lateral and top view.
FIGURE 27 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 27. Isostichopus badionotus (Selenka, 1867). A, whole animal; B, C, tables in top and lateral view; D, Cshaped ossicle.
FIGURE 4 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 4. Calcareous rings; A, B, C with two radial pieces and one interradial piece, D with two interradial pieces and two notched radial pieces. A, ring with medium posterior projections; B, ring with short posterior projections; C, ring with no posterior projections; D, tubular ring with long, complex, posterior projections.
FIGURE 9 in A taxonomic guide to the Echinodermata of the South Atlantic Bight, USA: 1. Sea cucumbers (Echinodermata: Holothuroidea)
FIGURE 9. Aslia pygmaea (Théel, 1886a). A, whole animal; B, C, cups in top and side view; D, E, buttons.
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