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opencc-by-4.0Mar 2022View details →

Hydrographic and velocity data during Leg 1 of the R/V Hespérides MOC2 cruise, 7-18 April 2010, western equatorial Atlantic

This dataset consists of 47 CTD and LADCPs casts from the sea surface down to 5000 m. These hydrographic casts were done during the first leg of the MOC2-Equatorial oceanographic cruise, which took place in the western equatorial Atlantic (5°S-5°N; 46°W-30°W] between 7 and 18 April 2010, onboard the R/V Hespérides. Temperature and conductivity were obtained with a SeaBird 911-Plus multi-probe system mounted on a 24 Niskin-bottle rosette that collected water samples at standard depths, which were used to calibrate the conductivity data. Duplicate temperature and conductivity sensors were used as a quality control measure. The LADCPs were RDI 300 kHz Workhorse Monitor instruments used in synchronized master-slave mode. The system was set to a ping-rate of 1 ping/s and a bin length of 10 m, and the data was processed using the IFM-GEOMAR LADCP software, Version 10.8. The LADCPs velocity data were de-tided using the TPXO.3 global model of ocean tides. The netcdf file MOC2_leg1.nc contains data interpolated linearly every 1 m from surface to 1500 m depth.

opencc-by-4.0Oct 2020View details →

FIGURE 5 in Dancing with the devil: courtship behaviour, mating evidences and population structure of the Mobula tarapacana (Myliobatiformes: Mobulidae) in a remote archipelago in the Equatorial Mid-Atlantic Ocean

FIGURE 5 | Distinct courtship behaviors of sicklefin devil rays Mobula tarapacana observed in the Saint Peter and Saint Paul Archipelago. A. Female being chased by two males. B. Male overlapping female. C. Male trying to overlap on female. D. Male overlaps the female with two more males chasing. E–F. Sequence of male following female.

opencc-by-4.0Oct 2020View details →

FIGURE 3 in Dancing with the devil: courtship behaviour, mating evidences and population structure of the Mobula tarapacana (Myliobatiformes: Mobulidae) in a remote archipelago in the Equatorial Mid-Atlantic Ocean

FIGURE 3 | Female (grey) and male (black) Mobula tarapacana size distribution (disk width- DW, in meters) per month, in the Saint Peter and Saint Paul Archipelago (SPSPA), from December 2008 to June 2016. Red dashed line= size at maturity for males (White et al., 2006); blue dashed line= size at maturity for females (Notarbartolo di Sciara, 1988).

opencc-by-4.0Aug 2024View details →

Surface Sedimentary Black Carbon Concentrations, Fluxes, and Stable and Radiocarbon Isotopes in the Equatorial Atlantic Ocean

Abstract Surface sediments (0-1 cm) obtained from equatorial Atlantic Ocean isolated for black carbon using the chemothermal oxidation at 375 method. Multicores were taken during aboard the R.V. Endeavor (EN651) from February 27th 2020 through March 17th 2020 using a MC-800. Core collection MC-800 tubes were labeled (EN651-“Site number”-MC”coring attempt number”“letter of core”,ex: EN651-01-MC01a) and photographed before sectioning. The water on top of the core was syphoned off and a thin piece of stainless-steel sheet was slid under the foot of the tube. The foot was bent up and the stainless-steel sheet was used to transfer the core to the core extruder. Cores were sectioned at 1 cm intervals down to 10 cm, then 2 cm intervals down to 20 cm, using the piece of stainless-steel and a cake spatula to cut them. The remainder of the core was wrapped in combusted aluminum foil and placed in a zip-lock bag for storage. Sections of cores were stored in amber glass jars placed in a freezer. One core was transferred with the extruder to a PVC tube and capped for archival storage. If 5 or more cores were recovered, 0.5 cm sections would be taken down to 10 cm and the remainder of the core wrapped in foil and zip-lock bagged before being frozen. Due to a limited supply of jars, the 0.5 cm core sections were wrapped in combusted aluminum foil and placed in a ziplock bag before being stored with other samples. All cores and core sections were stored at -20 ̊C. Analytical methods Surface sediment samples (0 – 1 cm) were dried at 60 ˚C until dry and passed through a 420 µm sieve before analysis. Total organic carbon samples were weighed into silver capsules (Elemental microanalysis silver capsules ultra-clean pressed 8 x 5 mm, D2030), acidified to remove inorganic carbon (2 M HCl), and folded into tin capsules (Costech tin capsules 10 x 10 mm, 041073). Black carbon was isolated using the CTO 375 method 34. 100 mg of samples where weighed out into ceramic crucibles and spread into a thin layer prevent charring. Sample were combusted at 375 ˚C for 24 hrs. under the flow of ultra high purity air (0.4 L min-1). The remaining sediment was transferred to GC vials for storage, then processed the same as the TOC samples to remove any inorganic carbon present (as detailed above). Sampling equipment Sediment cores were collected using an MC-800 Analytical instrumentation  An Elemental Analyzer (Costech 4010 Elemental Analyzer) was used for quantification of the BC and TOC fractions. The same elemental analyzer coupled to an Isotope Ratio Mass Spectrometer (Thermo Delta V Advantage) was used for the sample carbon isotopes.  Radiocarbon isotopes were measured at the National Ocean Sciences Accelerator Mass spectrometry. Parameter names, descriptions, units Name, "Name of the sediment core from which the top 1 cm was sectioned" Collection Date, "Date the multicore was collected, month/day/year Lat, "Latitude of sampling site", decimal degrees Lon, "Longitude of sampling site", decimal degrees Depth, "Water depth of sample site", meters (m) MAR, "Mass accumulation rate", grams per square centimeters per thousand years (g cm-2 kyr-1), blank = no data TOC, "Total organic carbon concentration", milligrams per gram dry weight (mg g-1) TOC d13C, "Total organic carbon δ13C value", per mill (&permil;) TOC D14C, "∆14C value of TOC calibrated for a reservoir age of 550 years", per mill (&permil;), blank = no data BC, "Black carbon concentration", milligrams per gram dry weight (mg g-1) BC sd, "Black carbon concentration standard deviation", milligrams per gram dry weight (mg g-1) BC d13C, "Black carbon delta 13C value", per mill (&permil;), NA BC D14C, "∆14C value of the BC", per mill (&permil;), blank = no data BC flux, "Flux of black carbon to sediments", milligrams per square centimeters per thousand years (mg cm2 kyr-1), blank = no data BC flux sd, "The standard devation of the flux of black carbon to sediments", milligrams per square centimeters per thousand years (mg cm2 kyr-1), blank = no data

Figure 9 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 9. - Fork length at first sexual maturity (L50) for Sphyraena guachancho caught in Côte d'Ivoire littoral from June 2010 to July 2011.

Figure 6 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 6. - Percentage of index of relative importance (IRI) for each prey of Sphyraeguachancho according to size classes.

Figure 7 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 7. - Hierarchical cluster analysis (Ward method) obtained from the matrix of percentages of IRI by items in the eight size classes.

Figure 5 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 5. - Percentage of index of relative importance (IRI) for each prey of Sphyraena guachancho according to seasons. GCS = Great Cold Season, GDS = Great Dry Season, LCS = Low Cold Season, LDS = Low Dry Season.

Figure 4 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 4. - Vacuity index percentage by size-classes of five centi- metres. Length is fork length (cm). The number above each histogram correspond to the number of stomachs examined. Figure 3. - Vacuity index by seasons; in Great Cold Season (GCS), Low Cold Season (LCS), Great Dry Season (GDS) and Low Dry Season (LDS). The number above each histogram correspond to General profile of the diet the number of stomachs examined. A total of 12 families of teleost fish and invertebrates were found in the stomachs of Sphyraena guachancho The mean vacuity index was 59.7% but varied with season (Tab. I). Prey families were divided mainly into teleost fish (Fig. 3). It was significantly higher in GCS (71.3%) than in (9), cephalopods (2) and Malacostraca (1). It was noted LCS (48.9%; χ2 = 4.2896; df = 1, p = 0.038). In the GDS that these categories are ingested in different proportions and LDS, the vacuity percentages were similar (respec- throughout the size class and marine seasons. The main tively 53.7% and 54.9%). All size classes had close vacuity prey of S. guachancho were the clupeids Sardinella spp. index values ranging from 55 to 72.1%, with the exception (IRI = 22.5%) and Ethmalosa fimbriata (IRI = 18.8%) and of 49-54 cm size class which had the lowest index (33.3%; the cephalopod Teuthida spp. (IRI = 14.0%). Secondary prey Fig. 4). were the shrimp Penaeus spp. (IRI = 12.4%) and the carangid Trachurus trecae (IRI = 9.2%). Table I. - List of prey found in the stomachs of Sphyraena guachancho caught along the coast Sphyraena guachancho were also of Ivory Coast from June 2010 to July 2011 with their occurrence percentage (F%), numerical a substantial prey item through canpercentage (N%), weight percentage (W%), and index of relative importance (IRI%). nibalism (IRI = 7.8%).

Figure 2 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 2. - Individuals percentage sampled by size classes in Great Cold Season (A), Great Dry Season (B), Low Dry Season (C), Low Cold Season (D). The number above each histogram correspond to the number of individuals.

Figure 8 in Diet of the barracuda Sphyraena guachancho in Côte d'Ivoire (Equatorial Eastern Atlantic Ocean)

Figure 8. - Evolution of percentage of Sphyraena guachancho maturity stages by seasons. GCS = Great Cold Season, GDS = Great Dry Season, LCS = Low Cold Season, LDS = Low Dry Season.

opencc-zeroDec 2004View details →

FIG. 2. — Lophogaster eurylepis n in A new species of Lophogaster (Crustacea, Mysidacea, Lophogastrida) from the equatorial eastern Atlantic

FIG. 2. — Lophogaster eurylepis n. sp., paratype; A, antennular peduncle; B, antennal scale; C, telson; D, posterior of telson. Scale bars: A, B, 0.5 mm; C, 1.0 mm; D, 0.1 mm.

opencc-zeroDec 2004View details →

FIG. 1. — Lophogaster eurylepis n in A new species of Lophogaster (Crustacea, Mysidacea, Lophogastrida) from the equatorial eastern Atlantic

FIG. 1. — Lophogaster eurylepis n. sp., carapace; A, lateral view; B, dorsal view. Scale bars: 2 mm.

Figs 21-36. Triebelina sertata Triebel, 1948 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Figs 21-36. Triebelina sertata Triebel, 1948: 21, MP-O-2426, LV; 22, MP-O-2427, RV; 23, MP-O-2428, LV, internal, view; 24, MP-O-2429, c, dorsal view. Triebelina sp.: 25, MP-O-2430, LV; 26, MP-O-2431, LV; 27, MP-O-2432, RV, internal view. Berguecythere insularis gen. nov., sp. nov.: 28, MP-O-2433, LV, ♀; 29, MP-O-2434, RV, ♀; 30, MP-O-2435, RV, ♀, internal view; 31, MP-O-2436, LV, ♀, internal view; 32, MP-O- 2437, LV, ♂; 33, MP-O-2438, RV, ♂; 34, MP-O-2436, LV, ♀, central muscle scars, not in scale; 35, MP-O-2439, c, ♀, dorsal view; 36, MP-O- 2440, c, ♂, dorsal view. The scale of all specimens = 100 µm, if no other indication.

Figs 3-20 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Figs 3-20. Keijcyoidea sp.: 3, MP-O-2411, RV, ♀; 4, MP-O-2412, LV, ♂; 5, MP-O-2413, LV, ♂, internal view; 6, MP-O-2414, LV, ♀; 7, MP- O-2415, LV, ♀, internal view; 8, MP-O-2415, LV, ♀, central muscle scars, not in scale; 9, MP-O-2416, c, ♀, dorsal view; 10, MP-O-2417, c, ♂, dorsal view. Propontocypris sp.: 11, MP-O-2418, internal view; 12, MP-O-2419, RV; 13, MP-O-2420, LV; 14, MP-O-2418, central muscle scars, not in scale. Neonesidea sp.: 15, MP-O-2421, RV; 16, MP-O-2422, LV; 17, MP-O-2423, c, dorsal view; 18, MP-O-2424, LV, internal view; 19, MP-O-2425, RV, internal view; 20, MP-O-2425, central muscle scars, not in scale. The scale of all specimens = 100 µm, if no other indication.

Figs 37-50 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Figs 37-50. Berguecythere insularis gen. nov, sp. nov.: 37, MP-O-2441, LV, juvenile; 38, MP-O-2442, LV, juvenile; 39, MP-O-2443, RV, juvenile; 40, MP-O-2444, RV, ♀, anterior marginal pore-canals, not in scale; 41, MP-O-2444, RV, ♀, posterior marginal pore-canals, not in scale. Loxocorniculum tricornatum Krutak, 1971: 42, MP-O-2445, LV, ♂, scale bar = 100 µm; 43, MP-O-2446, RV, ♂, scale bar = 100 µm; 44, MP-O-2447, RV, ♀, scale bar = 100 µm; 45, MP-O-2448, LV, ♀, scale bar = 100 µm. Microcythere sp.: 46, MP-O-2449, RV, scale bar = 20 µm; 47, MP-O-2450, LV; 48, MP-O-2451, LV, internal view; 49, MP-O-2452, RV, duplicature, transmitted light, not in scale; 50, MP-O-2453, c, dorsal view. The scale of all specimens = 50 µm, if no other indication.

Figs 51-66 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Figs 51-66. Paradoxostoma sp. 1: 51, MP-O-2454, RV, scale bar = 100 µm; 52, MP-O-2455, RV, internal view, scale bar = 100 µm; 53, MP-O-2455, RV, central muscle scars, not in scale. Paradoxostoma sp. 2: 54, MP-O-2456, RV; 55, MP-O-2457, LV; 56, MP-O-2457, LV, central muscle scars, not in scale. Paradoxostoma sp. 3: 57, MP-O-2458, LV. Xestoleberis sp. 1: 58, MP-O-2459, LV; 59, MP-O-2460, RV; 60, MP-O-2461, LV, internal view; 61, MP-O-2462, c, dorsal view, scale bar = 100 µm. Xestoleberis sp. 2: 62, MP-O-2463, RV; 63, MP-O-2464, LV; 64, MP-O-2465, c, dorsal view; 65, MP-O-2466, RV, internal view; 66, MP-O-2466, LV, central muscle scars, not in scale. The scale of all specimens = 50 µm, if no other indication.

Fig. 2 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Fig. 2. Sampling areas in the cove of the Archipelago of SÃo Pedro and SÃo Paulo, Equatorial Atlantic. For more details see Table I.

Fig. 1 in Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Fig. 1. Location map of the Brazilian oceanic islands and archipelagos showing the distance to the nearest continental cities (modified from ALMEIDA, 2006; COIMBRA & CARREñO, 2012).