Brazilian Journal of Oceanography
type: channel
description: To publish scientific contributions on Oceanography including physical oceanography, marine chemistry, marine geology and geophysics, biological oceanography, fisheries and related fields. Since April 2020 it became known as Ocean and Coastal Research
publisher: Universidade de São Paulo. Instituto Oceanográfico
language: en
publication name: Brazilian Journal of Oceanography
issn: 1679-8759
items: Ecological and conservation aspects of bycatch fishes: An evaluation of shrimp fisheries impacts in Northeastern Brazil
items: The north Brazil undercurrent and the wind driven hydrodynamics in Japaratuba submarine canyon, Brazil
items: Considering the impact of observation error correlation in ensemble square-root Kalman filter
items: Geospatial analysis of the effects of tsunami on coral and mangrove ecosystems of Mayabunder in Andaman Islands, India
items: The variability of the subantarctic front and the Southern Hemisphere atmospheric jet
items: Genetic diversity of eight wild populations of Pampus argenteus along the coast of China inferred from fifteen polymorphic microsatellite markers
items: Embryonic malformations in an offspring of the shortnose guitarfish
items: Tides and sea level variability decomposition in the Port of Santos Waterway
items: Lipid production in Dunaliella bardawil under autotrophic, heterotrophic and mixotrophic conditions
items: Salinity regulation of copepod egg production in a large microtidal estuary
items: Fishing operations to catch tuna on aggregated schools at the vicinity of a data buoy in the Western Equatorial Atlantic
items: Composition and distribution of Serranidae (Actinopterygii:Perciformes) larvae in the Southeastern Brazilian Bight
items: Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design
items: Energy budgets for juvenile Pacific whiteleg shrimp Litopenaeus vannamei fed different diets
items: Distribution patterns of meiofauna on a tropical macrotidal sandy beach, with special focus on nematodes (Caixa d’Água, Amazon Coast, Brazil)
items: Morphometric analysis in the shells of the planktonic foraminifera Orbulina universa: a source for paleoceanographic information?
items: Use of a species-rich and degraded tropical estuary by Elasmobranchs
items: Estimation of the hundred year return level of the significant wave height for the French Guiana coast
items: Erratum
items: Ocean acidification studies and the uncertainties relevance on measurements of marine carbonate system properties
items: Evaluating the gravity wave energy potential off the Brazilian coast
items: Modelling the effects of sea-level rise and sediment budget in coastal retreat at Hermenegildo Beach, Southern Brazil
items: Investigation of persistent coherent structures along the Southern Brazilian Shelf
items: Citogenotoxic response of juvenile cobia Rachycentron canadum (Linnaeus, 1766) reared in two different systems
items: Morphodynamics of a wave dominated embayed beach on an irregular rocky coastline
items: Prokaryotic picoplankton distribution within the oxygen minimum zone of the central Mexican Pacific across environmental gradients
items: Diet and reproductive aspects of the endangered butterfly ray Gymnura altavela raising the discussion of a possible nursery area in a highly impacted environment
items: The role of plant-crab interaction in structuring microphytobenthic communities in a shallow temperate estuary
items: New records of association between Brachyscelus cf. rapacoides (Arthropoda: Amphipoda) and medusae (Cnidaria: Scyphozoa and Hydrozoa) from São Sebastião Channel, southeast Brazil

Ecological and conservation aspects of bycatch fishes: An evaluation of shrimp fisheries impacts in Northeastern Brazil
type: item
subject: Note
  topic: section
creator: Rafaela Passarone
creator: Kátia Cristina Aparecido
creator: Leandro Nolé Eduardo
creator: Alex Souza Lira
creator: Lucas Vinícius Santos Silva
creator: Anne K. S. Justino
creator: Cecília Craveiro
creator: Emanuell F. Silva
creator: Flávia Lucena-Frédou
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19291
ending page: e19291
doi: 10.1590/s1679-87592019029106713

The north Brazil undercurrent and the wind driven hydrodynamics in Japaratuba submarine canyon, Brazil
type: item
description: The circulation induced by the wind and the North Brazil Undercurrent (NBU) in and surrounding the Japaratuba submarine canyon on the continental shelf of the basin of Sergipe and Alagoas is described using numerical modeling. The numerical simulations were implemented to determine the canyon influence in the local hydrodynamics and in the volume flow normal to the coast, considering several different scenarios, including a homogeneous and stratified fields of temperature and salinity. Northeast and East winds favor an upward flow in the canyon, while Southeast and South winds privilege subsidence. Winds parallel to the coast cause greater volume flow in the canyon section: 40° winds (relative to true the North, parallel to the coast) caused the highest upward flow, while winds from 215° to 220° caused the highest subsidence. On the other hand, the NBU favors subsidence motion and seems to predominate over the wind forcing.
subject: Original Article
  topic: section
subject: Japaratuba submarine canyon
  topic: keywords
subject: Wind-driven flow
  topic: keywords
subject: North Brazil Undercurrent
  topic: keywords
subject: Numerical modeling
  topic: keywords
creator: Sergio Rafael Del-Giovannino
creator: Marcelo Dottori
creator: Renato Parkinson Martins
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19221
ending page: e19221
doi: 10.1590/S1679-87592019022106702

Considering the impact of observation error correlation in ensemble square-root Kalman filter
type: item
description: Data assimilation has been developed into an effective technology that can utilize a large number of multisource unconventional data. It cannot only provide the initial field for the ocean numerical prediction model, but also construct the ocean reanalysis datasets and provide the design basis for the ocean observation plan. In data assimilation, the estimation of the observation error is of paramount importance, because the quality of the analysis depends on it. In general, the observation error covariance matrix is diagonal or assumed to be diagonal, which means that the observation errors are independent from one another. However, there are indeed correlations in the observation errors. A diagnostic method has been developed, which can estimate a correlated and more accurate observation error covariance matrix. The proposed method combines an ensemble squareroot Kalman filter with the diagnostic method, providing an estimation of the observation error covariance matrix. In order to test the performance of the method, the numerical experiments are performed with the Lorenz 96 model and a Shallow water model. The more accurate observation error covariance matrix can be obtained to use in ensemble square-root Kalman filter by using the new method. We could find using the estimated correlated observation error in the data assimilation improves the analysis.
subject: Original Article
  topic: section
subject: Correlated observation errors
  topic: keywords
subject: Data assimilation
  topic: keywords
subject: Ensemble square-root Kalman filter
  topic: keywords
creator: Shaodong Zang
creator: Jichao Wang
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19261
ending page: e19261
doi: 10.1590/s1679-87592019026106717

Geospatial analysis of the effects of tsunami on coral and mangrove ecosystems of Mayabunder in Andaman Islands, India
type: item
description: Mangroves and coral reefs are among the major ecosystems of tropical and subtropical coastlines. The Andaman group of islands, situated at the juncture of Bay of Bengal and Indian Ocean, are one of the richest coastal ecosystems of India in terms of biodiversity. Since the tsunami waves of 2004 affected this region severely, the outer fringes as well as inland areas of these islands faced extensive ecological degradation. Mayabunder is one such place of this region, where corals and mangroves had experienced both natural and anthropogenic threat. Considering the notable vulnerability of this coastal environment, the present study aimed to assess the transformations of the coral and mangrove ecosystems at Mayabunder both in pre-tsunami and post-tsunami periods till the present year using multi-temporal satellite imageries and geospatial techniques. Results showed that the areal coverage of healthy living coral reefs was reduced by 466.56 ha (10.42 %) from 1990 to 2000. Afterwards, the coupled ecosystem had experienced serious degradation again during the 2000−2010 phase. The areal coverage of dense mangroves decreased by 47.37%, whereas the area of dead coral covers showed a significant rise of 55.52%. However, partial restoration of both mangroves as well as healthy corals had also been observed here in recent years. It was raised from the extensive field visits and feedbacks from local inhabitants that this restoration initiative could become more effective if a participatory mode of management is adopted.
subject: Original Article
  topic: section
subject: Coral reef
  topic: keywords
subject: Human induced stress
  topic: keywords
subject: Mangrove
  topic: keywords
subject: Remote sensing
  topic: keywords
subject: Tsunami
  topic: keywords
creator: Debaleena Majumdar
creator: Subha Chakraborty
creator: Swati Saha
creator: Debajit Datta
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19258
ending page: e19258
doi: 10.1590/s1679-87592019025806715

The variability of the subantarctic front and the Southern Hemisphere atmospheric jet
type: item
description: The latitudinal variations of the Subantarctic Front (SAF) and Southern Hemisphere atmospheric jet were investigated for the period of 1993-2016. Zonal wind velocity, sea surface height and temperature data were used to identify these features over the South Atlantic, South Pacific and Indian Oceans individually. During this period, the atmospheric jet migrated poleward 0.34°S decade-1 in the Atlantic, 0.28°S decade-1 in the Pacific and 0.14°S decade-1 in the Indian oceans. Previous works have shown that the poleward trend is due to the expansion of the tropical belt as a consequence of greenhouse gas increase and cooling of polar stratosphere due to ozone depletion. In addition the atmospheric jet strengthen in all three basins. The SAF represents the Antarctic Circumpolar Current northern boundary and was observed in average at 46.3°S (±0.5°) in the Atlantic, 54.3°S (±0.3°) in the Pacific and 46.6°S (±0.5°) in Indian Oceans. The SAF shows a poleward migration of 0.46°S decade-1 in the Atlantic, 0.20°S decade-1 in the Pacific and 0.27°S decade-1 in the Indian Oceans, which is attributed to the sea level increasing in the Southern Hemisphere due to thermal expansion. The SAF poleward trend is consistent with the positive trend of the Southern Annular Mode during the studied period. Moreover, the jet position is statistically significant correlated to the SAF position in each ocean basin. However, the coefficients are weak: +0.22 for the Atlantic, +0.17 for the Pacific and +0.21 for the Indian oceans. The latitudinal displacement of the SAF in the Pacific is inversely proportional to the El Niño-Southern Oscillations (ENSO). During El Niño years the SAF tend to be more poleward and during La Niña years more equatorward, with maximum correlation of 0.56, with ENSO leading by three months.
subject: Original Article
  topic: section
subject: Subantarctic front
  topic: keywords
subject: Atmospheric jet
  topic: keywords
subject: Southern hemisphere
  topic: keywords
creator: João L. E. Simon
creator: Regina R. Rodrigues
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19256
ending page: e19256
doi: 10.1590/s1679-87592019025606712

Genetic diversity of eight wild populations of Pampus argenteus along the coast of China inferred from fifteen polymorphic microsatellite markers
type: item
description: Pampus argenteus (Perciformes: Stromateidae) is widely distributed along the coast of China, Indian Ocean, Arabian Gulf and North Sea. Due to overfishing and environmental degradation, its resources reduced year after year. Thus, new management strategies are urgently needed for the sustainable growth and utilization of this species. Characterization of the genetic variation of this fish species is essential for conserving the genetic resource and restraining the population decline. Therefore, it is necessary to have a clear understanding of the intraspecific genetic diversity and population structure of the species. In this study, we assess the genetic diversity and population structure of P. argenteus by using microsatellites. We genotyped 240 P. argenteus individuals from eight wild populations collected from Shidao (SD), Lianyungang (LYG), Lvsi (LS), Zhoushan (ZS), Dongtou (DT), Xiapu (XP), Haikou (HK), and Beibuwan (BBW) along the coast of China using fifteen polymorphic microsatellites. A total of 139 alleles were determined at 15 loci across the eight populations, and a relatively high level of genetic diversity was observed, with observed heterozygosity (Ho) and expected heterozygosity (He) ranging from 0.100 to 1.000, and from 0.669 to 0.934 per locus-location combination, respectively. LS had the highest average allele (number of alleles, A=15.200), and HK the lowest (A=13.000). Hos of P. argenteus are less than Hes, indicating lack of heterozygote within populations. Analysis of molecular variance (AMOVA) showed that most variation (95.66%) occurred within populations, suggesting that this is the main source of total variance. This study will provide useful information for conservation and sustainable exploitation of this important fishery resource.
subject: Original Article
  topic: section
subject: Pampus argenteus
  topic: keywords
subject: microsatellite
  topic: keywords
subject: genetic diversity
  topic: keywords
subject: population structure
  topic: keywords
creator: Dandan Sun
creator: Yushuang Ge
creator: Qiqun Cheng
rights: Copyright (c) 2020 Brazilian Journal of Oceanography
date: 2020-03-26
publication date: 2020-03-26
starting page: e19251
ending page: e19251
doi: 10.1590/s1679-87592019025106711

Embryonic malformations in an offspring of the shortnose guitarfish
type: item
description: Embryonic malformations can be a result of exposure toxic substances (pollution), lack of nutrients, physical restraint, genetic disorders, or infections and diseases. Such malformations can be classified according to severity and offspring survival outside the uterus. Moreover, abnormalities are normally restricted to a small portion of the litter, mostly, to only one embryo. Here, we report a case of congenital malformation dominance in an offspring of the shortnose guitarfish and compare it with other abnormalities commonly reported in batoids in addition to discussing the possible causes involved in the observed deformities.
subject: Note
  topic: section
subject: congenital anomalies
  topic: keywords
subject: maternal health
  topic: keywords
subject: guitarfish
  topic: keywords
creator: Natascha Wosnick
creator: Verônica Takatsuka
creator: Ana Eliza Mello
creator: June Dias
creator: Nicolas Lubitz
creator: Venâncio Guedes de Azevedo
rights: Copyright (c) 2019 Brazilian Journal of Oceanography
date: 2019-11-21
publication date: 2019-11-21
starting page: e19273
ending page: e19273
doi: 10.1590/s1679-87592019027306710

Tides and sea level variability decomposition in the Port of Santos Waterway
type: item
subject: Note
  topic: section
creator: Carlos A.F. Schettini
creator: Eliane C. Truccolo
creator: José A.D. Mattos
creator: Daniel C.D.A. Benevides
rights: Copyright (c) 2019 Brazilian Journal of Oceanography
date: 2019-11-21
publication date: 2019-11-21
starting page: e19265
ending page: e19265
doi: 10.1590/s1679-87592019026506707

Lipid production in Dunaliella bardawil under autotrophic, heterotrophic and mixotrophic conditions
type: item
description: Many microalgae are rich in lipid. Due to their low growth rates in the autotrophic culture, the best alternative is to cultivate cells under different conditions such as heterotrophic or mixotrophic, which results in the highest yield of biomass and lipid in the shortest duration. In this study, Dunaliela bardawil (UTEX 2538) green microalgae was cultivated under different culture conditions, autotrophic, heterotrophic and mixotrophic, and effects on cell concentration, lipid production and reactive oxygen species (ROS), total chlorophyll and beta-carotene concentrations were investigated. Due to very low cellular growth, this alga is not recommended for heterotrophic culture. In terms of mixotrophic conditions containing different concentrations of glucose or acetate, the highest cell growth and lipid production in 60mM glucose was similar to the control (autotrophic condition), while the concentrations of chlorophyll and beta-carotene decreased. However, at all concentrations of acetate, a slight increase in cell growth was achieved, while the lipid content decreased. Additionally, the concentrations of chlorophyll and beta-carotene increased. A positive correlation was observed between beta-carotene biosynthesis and lipid production, as well as levels of reactive species of oxygen and lipid production in the presence of glucose and acetate. This study showed that for D. bardawil the mixotrophic culture with 60mM glucose was the most suitable type of culture for increasing lipid content and cell growth rates in less time (one week).
subject: Original Article
  topic: section
subject: beta-carotene
  topic: keywords
subject: cell growth
  topic: keywords
subject: chlorophyll
  topic: keywords
subject: culture condition
  topic: keywords
subject: reactive oxygen species
  topic: keywords
creator: Zohreh Zare Chavoshi
creator: Mansour Shariati
rights: Copyright (c) 2019 Brazilian Journal of Oceanography
date: 2019-11-19
publication date: 2019-11-19
starting page: e19249
ending page: e19249
doi: 10.1590/s1679-87592019024906709

Salinity regulation of copepod egg production in a large microtidal estuary
type: item
description: Salinity is a key variable for ecological processes in estuaries. Acartia tonsa is a typical estuarine copepod whose responses to salinity have been thoroughly studied in the laboratory. However, results cannot be extrapolated to the field, and formal comparisons between lab and field responses to salinity were not attempted. Here we compare lab-based with field copepod egg production rates (EPR) from the Río de la Plata estuary (RPE), with focus on A. tonsa. Field work was conducted between 2009 and 2011 in the mixing zone of the RPE. Water temperature, salinity and chlorophyll-a varied over ample ranges (temperature: 10.54 - 24.56ºC, salinity: 2.83 - 32.99, chlorophyll-a: 0.62 - 7.27 mg m-3). A. tonsa was the strongly dominant species. EPR ranged between 6.7 and 95.7 eggs female-1 day-1, and correlated to salinity, temperature (weakly), but not to chlorophyll. The relationship between A. tonsa’s EPR (EPRAT) and salinity was consistent with that obtained under laboratory conditions: a humped pattern with a maximum at intermediate salinities. However, differences were also evident, e.g., higher EPRAT was measured in the field. We speculate that discrepancies derive from nutritional differences between field and reference (laboratory) data sets. Besides salinity, food quality and quantity may be first order drivers of A. tonsa’s productivity in the RPE.
subject: Original Article
  topic: section
subject: Copepods
  topic: keywords
subject: Estuary
  topic: keywords
subject: Acartia tonsa
  topic: keywords
subject: Egg production rate
  topic: keywords
subject: Río de la Plata
  topic: keywords
creator: Danilo Luis Calliari
creator: Noé Espinosa
creator: Mariano Martínez
creator: Laura M. Rodríguez-Graña
rights: Copyright (c) 2019 Brazilian Journal of Oceanography
date: 2019-11-19
publication date: 2019-11-19
starting page: e19267
ending page: e19267
doi: 10.1590/s1679-87592019026706708

Fishing operations to catch tuna on aggregated schools at the vicinity of a data buoy in the Western Equatorial Atlantic
type: item
subject: Errata
  topic: section
creator: Guelson Batista da Silva
creator: Humberto Gomes Hazin
creator: Paulo Victor do Nascimento Araújo
rights: Copyright (c) 0
date: 2019-06-06
publication date: 2019-06-06
ending page: 6642
doi: 10.1590/s1679-875920186604er

Composition and distribution of Serranidae (Actinopterygii:Perciformes) larvae in the Southeastern Brazilian Bight
type: item
description: This study describes the taxonomic composition and horizontal distribution of Serranidae larvae along the Southeastern Brazilian Bight (SBB, approximately 22°S and 28°S), and investigates how environmental and biological factors influence the larval distribution. Ichthyoplankton samples were collected in 10 oceanographic cruises conducted from 1975 to 1981. Serranidae larvae were identified into 15 species, including 11 genera and four subfamilies. Except for Diplectrum formosum, which was widely distributed throughout the SBB, Hyporthodus spp. and Baldwinella vivanus were distributed in the southern portion of the SBB, while other species were distributed mainly in the northern portion of the SBB, inside the 200 m isobath. Local depth, latitude, distance from the closest island and salinity were factors that influenced significantly on the distribution and abundance of the most abundant taxa D. formosum, Diplectrum spp., Serranus spp. and Mycteroperca spp. Significant progress was made in identifying grouper larvae from the SBB (Epinephelus morio, Epinephelus itajara and Hyporthodus nigritus).
subject: Original Article
  topic: section
subject: Anthiadinae
  topic: keywords
subject: Epinephelinae
  topic: keywords
subject: Ichthyoplankton
  topic: keywords
subject: Serraninae
  topic: keywords
creator: Mariana Rodrigues dos Santos
creator: Mario Katsuragawa
creator: Maria de Lourdes Zani-Teixeira
creator: Jana Menegassi del Favero
rights: Copyright (c) 0
date: 2019-06-06
publication date: 2019-06-06
starting page: e19264
ending page: e19264
doi: 10.1590/s1679-87592019026406701

Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design
type: item
description: Studies involving coastal sediment resuspension have shown that trace metals could be released to the water column due to changes in physical-chemical conditions. Therefore, if environmental agencies adopt screening protocols with insufficient evaluations of contaminant mobilization risks for a given area, the prediction of environmental impacts caused by dredging may be limited. This work evaluates the influence of spatial variation on the geochemical mobility of trace metals (Cd, Cu, Ni, Pb, Zn) after artificial sediment resuspension, using as study case the Iguaçu River estuary (Guanabara Bay, Brazil). The Iguaçu River drains the industrial complex of the metropolitan area of Rio de Janeiro State, besides the presence of agriculture and the input of untreated domestic wastes. Surface estuarine sediments were submitted to resuspension experiments in an open system, during 1h and 24h of agitation on local water. A clear tendency of metals’ solubilization was observed after resuspension, especially considering the dissolved concentrations of Cu (average: 8.0 µg L-1) and Zn (average: 0.9 mg L-1), especially for the samples from the transects 2 and 3. However, evaluations of water quality changes due to sediment resuspension are not requested by the legislation regulating the dredging activities. In the sediments, the results suggested a higher geochemical mobility of Cu, indicated by the massive increase on the bioavailable fraction after resuspension, mainly on the transect number 3, on the river’s mouth. The effects of resuspension were distinct between samples, suggesting that even in a small scale, important differences on metals’ mobility are found. Thus, the combined assessment of changes in metal concentrations in water and in the metal partitioning linked to the solid-phase was demonstrated to be a promising tool for predicting the environmental risks of dredging due to changes in the bioavailability of metals.
subject: Original Article
  topic: section
subject: Bioavailability
  topic: keywords
subject: resuspension
  topic: keywords
subject: Guanabara Bay
  topic: keywords
subject: remobilization
  topic: keywords
subject: trace metals
  topic: keywords
creator: Christiane do Nascimento Monte
creator: Ana Paula de Castro Rodrigues
creator: Alexandre Rafael de Freitas
creator: Aline Soares Freire
creator: Ricardo Erthal Santelli
creator: Bernardo Ferreira Braz
creator: Wilson Machado
rights: Copyright (c) 0
date: 2019-06-06
publication date: 2019-06-06
starting page: e19227
ending page: e19227
doi: 10.1590/s1679-87592019022706701

Energy budgets for juvenile Pacific whiteleg shrimp Litopenaeus vannamei fed different diets
type: item
description: Energy budgets for juvenile Pacific whiteleg shrimp, Litopenaeus vannamei (1.7-4.0 g ) fed with different diets were assessed. The energy partitioning between growth, respiration, ammonia excretion, feces and exuvia was calculated to estimate for total food energy intake. Shrimp oxygen consumption and ammonia excretion were quantified in sealed chambers (25°C, 34 ppt). Energy allocated for growth and feces were obtained from the wet combustion of whole body and feces samples, exuvia was estimated as 10% growth energy. Three diets were tested: 100% chopped fish (Fish), 100% commercial feed (Feed), and 50-50% chopped fish and commercial feed (Mix). Most of the energy from the diets was channeled into respiration (49.7-70.5%). Shrimp fed the Feed diet used more energy in growth (24.4%) than those fed Mix (13.4%) or Fish diets (13.2%), either in absolute (joule) or relative (% of ingested energy) terms. Conversely, energy loss as ammonia excretion was lower in shrimp fed Feed (1.0%) compared to shrimp fed Mix (4.2%) or Fish diets (7.8%). Less energy was lost in feces by shrimp fed Fish diet (7.3%) compared to Mix (20.2%) and Feed diets (22.2%). The calculated energy intake by shrimp fed Fish, Mix and Feed were 0.995, 1.100, and 1.255 kJ ind-1day-1, respectively. According to the O:N atomic ratios (oxygen consumed to nitrogen excreted), protein tented to be the predominant substrate catabolized by shrimp fed Fish (O:N=16±5.2), and Mix (O:N=25±11.6), with increasing use of carbohydrates and/or lipids in the Feed (O:N=74±37.3). Results suggest diet composition may affect energy budget and partitioning differently between metabolism and growth either in absolute or relative terms, as shrimp fed Fish and Mix diets used protein as main substrate for metabolism, whereas shrimp fed Feed diet channeled protein for growth, and lipids and carbohydrates for other metabolic functions.
subject: Original Article
  topic: section
subject: Bioenergetics
  topic: keywords
subject: Shrimp
  topic: keywords
subject: Energy partitioning
  topic: keywords
subject: Growth
  topic: keywords
subject: Feed efficiency
  topic: keywords
subject: Litopenaeus vannamei
  topic: keywords
creator: Rafael Tsuyoshi Inoe Coelho
creator: Fanny Ayumi Yasumaru
creator: Maria José Arruda Campos Rocha Passos
creator: Vicente Gomes
creator: Daniel Lemos
rights: Copyright (c) 0
date: 2019-06-06
publication date: 2019-06-06
starting page: e19243
ending page: e19243
doi: 10.1590/s1679-87592019024306701

Distribution patterns of meiofauna on a tropical macrotidal sandy beach, with special focus on nematodes (Caixa d’Água, Amazon Coast, Brazil)
type: item
description: Spatial distribution patterns (both horizontal and vertical) of meiofauna, with special focus on nematodes, on a tropical macrotidal beach across different climatic periods were analyzed in this study. Samplings were carried out at five stations in the intertidal zone in June (rainy season) and December (dry season), 2011. At each station, three samples were taken using a corer with 3cm diameter, which was thrust 10cm into the substrate and stratified in 0-2, 2-5, and 5-10cm. Meiofauna was comprised of 16 groups and Nematoda was the dominant. Meiofauna density during rainy season was higher at the central intertidal station and during dry season it was lower near the high tide mark, followed by an increasing trend towards the low tide mark. Meiofauna was more concentrated in the upper sediment layer during rainy season. However, during dry season, the highest density occurred in the lower sediment layer at both stations near the high tide mark. Nematoda association was comprised of 72 genera, with Daptonema and Theristus (both from the family Xyalidae) as the dominant ones in most stations and strata. The genera richness and diversity increased towards the low tide mark, with lower richness in the upper stratum at most stations. Non-selective deposit-feeders predominated during rainy season, while at dry season there was an alternation of dominance between non-selective deposit-feeders and epistrate feeders. Significant differences were found in the meiofauna community, as well as in the Nematoda association in regard to the months, stations, and sediment layers. The distribution patterns of interstitial organisms found in this study, in part, follow what is already known for microtidal beaches but other differential aspects were observed even if compared to environments of macrotidal beaches in temperate regions.
subject: Original Article
  topic: section
subject: Meiobenthos
  topic: keywords
subject: Spatial distribution
  topic: keywords
subject: Temporal distribution
  topic: keywords
subject: Macrotidal
  topic: keywords
subject: Continental island
  topic: keywords
subject: Amazon Region
  topic: keywords
creator: Erivaldo Baia
creator: Virag Venekey
rights: Copyright (c) 0
date: 2019-06-06
publication date: 2019-06-06
starting page: e19230
ending page: e19230
doi: 10.1590/s1679-87592019023006701

Morphometric analysis in the shells of the planktonic foraminifera Orbulina universa: a source for paleoceanographic information?
type: item
description: In this study, we describe morphometric analyses of Orbulina universa morphotypes presently found in the Western South Atlantic, and their relation to the upper water thermohaline indexes. We also investigate this relationship under glacial and interglacial conditions between 7.2 and 32 kyr BP. Ten plankton samples distributed between 32º55' and 26º20'S were selected for the analyses of modern O. universa specimens. Core SIS188 was retrieved at 29º22’S, 47º28’W enabling the analysis of 21 fossil samples. Shell diameter, pore diameter, pore density and porosity were measured using SEM images. Chronology of core SIS188 is based on four AMS 14C ages and the planktonic foraminifera oxygen isotope curve. Planktonic foraminifera relative abundances were converted into SST data using the Modern Analog Technique (MAT). Correlations between the morphometric parameters and temperature and salinity of surface Waters (modern samples) or paleotemperature (fossil samples) were calculated. Morphological characteristics of the analyzed shells allowed to differentiate two morphotypes of O. universa, namely Caribbean and Mediterranean in the studied region. For the Caribbean morphotype, the large pore density showed a negative correlation with both temperature and salinity. For the Mediterranean morphotype, no significant correlations were found. For fossil samples, no significant correlations were found between summer SST (0-50m) and morphometric parameters for the Caribbean or the Mediterranean morphotypes. Possibly, other genotypes do exist in the fossil record, so modern and fossil morphotypes would not have the same behavior. Another explanation for the absence of correlation in fossil samples are errors associated with the SST estimates. Furthermore, fossil samples could represent distinct and more complex oceanographic conditions compared to current configuration, with Plata Plume Water and Brazil Malvinas Confluence migration playing a most significant role in the past.
subject: Original Article
  topic: section
subject: Southwest Atlantic
  topic: keywords
subject: Caribbean morphotype
  topic: keywords
subject: Mediterranean morphotype
  topic: keywords
subject: paleotemperature
  topic: keywords
creator: Mónica Liliana Duque-Castaño
creator: Adriana Leonhardt
creator: María Alejandra Gómez Pivel
rights: Copyright (c) 2019 Brazilian Journal of Oceanography
date: 2019-06-06
publication date: 2019-06-06
starting page: e19252
ending page: e19252
doi: 10.1590/s1679-87592019025206701

Use of a species-rich and degraded tropical estuary by Elasmobranchs
type: item
subject: Notes
  topic: section
creator: Fernanda Gonçalves-Silva
creator: Marcelo Vianna
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-06
publication date: 2018-12-06
starting page: 339
ending page: 346
doi: 10.1590/s1679-87592018020106604

Fishing operations to catch tuna on aggregated schools at the vicinity of a data buoy in the Western Equatorial Atlantic
type: item
subject: Notes
  topic: section
creator: Guelson Batista da Silva
creator: Humberto Gomes Hazin
creator: Paulo Víctor Araújo do Nascimento
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-06
publication date: 2018-12-06
starting page: 335
ending page: 338
doi: 10.1590/s1679-87592018018206604

Estimation of the hundred year return level of the significant wave height for the French Guiana coast
type: item
subject: Notes
  topic: section
creator: Robert Osinski
creator: Alice Dalphinet
creator: Lotfi Aouf
creator: Philippe Palany
rights: Copyright (c)
date: 2018-12-06
publication date: 2018-12-06
starting page: 325
ending page: 334
doi: 10.1590/s1679-87592018017906604

Erratum
type: item
description: u
subject: Errata
  topic: section
creator: Renata Polyana de Santana Campelo
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 243
ending page: 244
doi: 10.1590/s1679-8759201806611529rpsc

Ocean acidification studies and the uncertainties relevance on measurements of marine carbonate system properties
type: item
subject: Note
  topic: section
creator: Adriana Rodrigues Perretti
creator: Ana Cecília Rizzatti de Albergaria-Barbo
creator: Rodrigo Kerr
creator: Leticia Cotrim da Cunha
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 234
ending page: 242
doi: 10.1590/s1679-87592018000706602

Evaluating the gravity wave energy potential off the Brazilian coast
type: item
description: The wave energy potential on the Brazilian coast is estimated using in-situ buoy data and model data. The results present a greater potential on the southern-southeastern coast than on the northeastern coast, but the variance is also larger. These seem to be associated with the different atmospheric regimes. While in the northeastern portion the trade winds determine the wave regime, in the south the passage of cold front systems plays a major role. For almost all regions and throughout the year, the energy potential oscillates between 10 and 30 kW/m, the most efficient range to implement wave energy converters. The occurrence of sea states is also assessed, showing that the passage of cold front systems also creates different sea states in the S-SW area. Finally, the most common sea states and energy flux are estimated, showing a shift towards longer periods and higher waves for the latter. On the S-SW coast, although the most frequent sea states have waves with periods around 8 s, the energy flux has a more balanced distribution between these and the waves with periods around 11s, the common period for waves generated by cold front systems. This result shows that the most common sea state is not necessarily the one that should be considered when planning wave energy converters for the region.
subject: Original Article
  topic: section
subject: wave energy
  topic: keywords
subject: PNBOIA
  topic: keywords
subject: WaveWatch III
  topic: keywords
subject: Brazilian coast.
  topic: keywords
creator: Camila Pegorelli
creator: Marcelo Dottori
creator: João Flesch Fortes
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 220
ending page: 233
doi: 10.1590/s1679-87592018011706602

Modelling the effects of sea-level rise and sediment budget in coastal retreat at Hermenegildo Beach, Southern Brazil
type: item
description: Climate change effects such as accelerated sea-level rise, wave climate alteration and disturbances on sediment-budgets are anticipated to lead to a range of adverse impacts in coastal regions around the world. A rise in sea-level is expected to cause shoreline recession, and a sediment deficit can have a similar effect. Since large uncertainties exist in relation to sea-level rise rates and sediment budgets, it is relevant to determine how sensitive the coast is to each of these disturbances. In this context, this paper provides a quantitative evaluation of each of these parameters in terms of modeled coastal recession through risk-based assessments using an aggregated coastal model, the DRanSTM (Dilating Random Shoreface Translation Model). In each separate computer simulation, a sediment budget and a sea-level scenario were set for an erosional coastal stretch: Hermenegildo Beach, Rio Grande do Sul state in southern Brazil. Effects of changes in wave climate were not directly considered in this study. However, indirect measures of such changes should be reflected on coastal sediment budgets. Simulation results demonstrate that under present-day sea-level rise rates, sediment deficit exerts control over coastal recession. Conversely, under the higher forecasted sea-level rise for the year 2100, mean shoreline recession will be dictated by sea-level rise, considering historical sediment deficit will be sustained.
subject: Original Article
  topic: section
creator: Salette Amaral de Figueiredo
creator: Lauro Julio Calliari
creator: Arthur Antonio Machado
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 210
ending page: 219
doi: 10.1590/s1679-87592018009806602

Investigation of persistent coherent structures along the Southern Brazilian Shelf
type: item
description: The freshwater-influenced region of the Patos Lagoon discharge to the Southern Brazilian Shelf (SBS) is a region of complex fluid dynamics. Seasoning and synoptic variable winds and coastal current conditions create an alternating flow pattern. The aim of this paper was to investigate the occurrence of persistent coherent structures in this environment. A numerical approach was chosen to describe the main hydrodynamic features of the region during a climatological year. The open-source finite-element code TelemacMascaret was applied to the three-dimensional domain. In addition the two-equation k-epsilon model described the turbulence mechanisms. The presence of persistent high-turbulent structures was identified within the study area. These occur as a strong curvilinear disturbance characterized by higher turbulent production and dissipation rates, which increase local mixture. As a result, upward circulation flow was observed, which may be due to irregularities in bottom topography associated with wind-induced stress forces. These results increase the information about the circulation structures of the study area by means of numerical modelling analysis.
subject: Original Article
  topic: section
subject: Coastal current
  topic: keywords
subject: Coherent structures
  topic: keywords
subject: Turbulence
  topic: keywords
subject: TELEMAC3D
  topic: keywords
subject: Finite element method
  topic: keywords
creator: Maximilian Joachim Hodapp
creator: Eduardo de Paula Kirinus
creator: Wiliam Correa Marques
creator: Phelype Haron Oleinik
creator: Osmar Olinto Moller
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 199
ending page: 209
doi: 10.1590/s1679-87592018005906602

Citogenotoxic response of juvenile cobia Rachycentron canadum (Linnaeus, 1766) reared in two different systems
type: item
description: Aquaculture production is continuously growing worldwide, and marine fish farming in Brazil is still in its infancy. Intensive farming conditions may cause physiological stress to the cultured organism, which can be evaluated by citogenotoxic biomarkers. The aim of this study was to assess the genotoxic effect of the rearing conditions in red blood cells of juvenile cobia Rachycentron canadum by using comet assay and micronucleus and other nuclear abnormalities assay. Juvenile cobia were reared for 13 weeks in indoor tank with open water circulation and in near shore cage. The comet assay and the nuclear abnormalities assay detected higher DNA damage and higher nuclear abnormalities frequency in erythrocytes of fish reared in the indoor tank. Results showed that two methods are complementary. Additionally, cobia were injected with ß-naphthoflavone (BNF) at concentrations of 2mgkg-1 and 10mgkg-1 in laboratory controlled conditions, and maintained for 7 days in separate tanks to better understand the response mechanisms of this species to a toxic substance. The comet assay did not detect any significant differences between BNF injected and control fish, whereas nuclear abnormalities assay showed significant differences between BNF injected and the control groups. The damages identified by the comet assay are repairable breaks in the DNA strands, whereas nuclear abnormalities may be permanent. Possibly the period of maintenance after injection was enough to clean BNF from the organisms and to repair the breaks in the DNA strands. As cobia seems to respond very well to genotoxic elements, comet assay and nuclear abnormalities assay would be useful tools to monitor farming conditions.
subject: Original Article
  topic: section
subject: Comet assay
  topic: keywords
subject: Rachycentron canadum
  topic: keywords
subject: Micronucleus
  topic: keywords
subject: β-naphthoflavone
  topic: keywords
subject: Aquaculture
  topic: keywords
creator: Marina Tenório Botelho
creator: Maria José de Arruda Campos Rocha Passos
creator: Fabio Matsu Hasue
creator: Daniel Lemos
creator: Edson Rodrigues
creator: Fanny Yasumaru
creator: Ngan van Phan
creator: Vicente Gomes
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 189
ending page: 198
doi: 10.1590/s1679-87592018005406602

Morphodynamics of a wave dominated embayed beach on an irregular rocky coastline
type: item
description: Wave-dominated embayed beaches on irregular rocky coastlines are highly appreciated for their landscapes and tourism potential. Yet our understanding about the interaction of the oceanographic processes with the geological inheritance in this type of beaches still needs further investigation to better understand their natural balance. In this study, we apply the classical approach of morphodynamics to describe for the first time the variations in the Boiçucanga beach morphology, an embayed beach located in São Sebastião City on an irregular rocky coastline that is well known for its beautiful beaches embedded in the valleys of Serra do Mar. Field surveys were performed over 15 months, between April 2008 and September 2009, seeking to evaluate the interactions among the morphology, sediments and hydrodynamic characteristics at Boiçucanga. All data generated during the field surveys have supported the application of the following morphodynamic models: Classification of morphological beach stages [O]; Number of nearshore sandbars [B*]; Relative tide range [RTR]; Beach exposure on embayed coasts [Ro/a and ß]; and Embayment beach scaling parameter [d] to determine the geomorphological behavior of the beach on monthly and annual time scales. From these models, Boiçucanga is classified as a deep embayed beach exposed to highenergy waves, with a predominant reflective profile, which favors the development of beach cusps and topographically controlled rip currents. The combined results of the field observations and applied models allowed us to better understand the role of geological heritage in the two morphodynamic signatures found at the same beach arch. For future studies, we will focus on numerical models to increase the understanding of the hydrodynamic processes that govern the sediment transport in Boiçucanga.
subject: Original Article
  topic: section
subject: Geological inheritance
  topic: keywords
subject: Geomorphology
  topic: keywords
subject: Sediment transpor
  topic: keywords
subject: Morphoscopy
  topic: keywords
subject: Granulometry
  topic: keywords
creator: Mario Luiz Mascagni
creator: Eduardo Siegle
creator: Moysés Gonsalez Tessler
creator: Samara Cazzoli y Goya
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 172
ending page: 188
doi: 10.1590/s1679-87592018005006602

Prokaryotic picoplankton distribution within the oxygen minimum zone of the central Mexican Pacific across environmental gradients
type: item
description: Marine picophytoplankton has become an important issue to understand the global ecology of phototrophic forms, due to its wide distribution and contribution to biomass and productivity. We studied the abundance, distribution and signature pigments of the prokaryote picophytoplankters Prochlorococcus and Synechococcus during an oceanographic cruise (26 April to 7 May, 2011) in the central Mexican Pacific, a relatively poorlyknown oxygen minimum zone (OMZ), and the effect of three environmental gradients. Prochlorococcus and Synechococcus abundances were comparable with those found in other tropical areas (0.17 to 30.37 X 104 cells mL-1, and 0.9 to 30.97 X 104 cells mL-1, respectively). Prochlorococcus abundances reached highest numbers in deeper waters, often coinciding with the second deep in situ fluorescence (and chlorophyll α) maxima, at oceanic stations, below the nitratecline, whereas Synechococcus abundances were higher at subsurface waters and its concentration maxima usually coincided with the subsurface in situ fluorescence maxima, with slightly higher abundances in coastal stations. Statistical analyses support significantly these results. Distribution of divinyl-chlorophyll α was erratic along the water column and occasionally coincided with the deep in situ fluorescence maxima, whereas the distribution of zeaxanthin usually followed that of chlorophyll α and the abundances of Synechococcus, and peaked together. These results are similar to those previously found in the study area and in more temperate zones, and also to the general trend in OMZ, but confirm that the second deep chlorophyll α maxima are attributed to high Prochlorococcus densities. We additionally found the abundance and distribution of Prochlorococcus and Synechococcus strongly driven by the environmental gradients observed.
subject: Original Article
  topic: section
subject: Mexican Pacific
  topic: keywords
subject: Oxygen minimum zone
  topic: keywords
subject: Prochlorococcus
  topic: keywords
subject: Prokaryote picophytoplankton
  topic: keywords
subject: Synechococcus
  topic: keywords
creator: Zuleima Santana-Vega
creator: David Uriel Hernández-Becerril
creator: Alejandro R. Morales-Blake
creator: Francisco Varona-Cordero
creator: Martín Merino-Ibarra
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 157
ending page: 171
doi: 10.1590/s1679-87592018004806602

Diet and reproductive aspects of the endangered butterfly ray Gymnura altavela raising the discussion of a possible nursery area in a highly impacted environment
type: item
subject: Note
  topic: section
creator: Fernanda Gonçalves Silva
creator: Marcelo Vianna
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 315
ending page: 324
doi: 10.1590/s1679-8759201801906603

The role of plant-crab interaction in structuring microphytobenthic communities in a shallow temperate estuary
type: item
subject: Note
  topic: section
creator: Carolina Fernández
creator: Constanza Da-Rodda
creator: María Cecilia Gauna
creator: María Emilia Croce
creator: Elisa R. Parodi
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 307
ending page: 314
doi: 10.1590/s1679-87592018018906603

New records of association between Brachyscelus cf. rapacoides (Arthropoda: Amphipoda) and medusae (Cnidaria: Scyphozoa and Hydrozoa) from São Sebastião Channel, southeast Brazil
type: item
subject: Note
  topic: section
creator: Francisco Alejandro Puente Tapia
creator: Rebeca Gasca
creator: Gabriel Genzano
creator: Agustín Schiariti
creator: André Carrara Morandini
rights: Copyright (c) 2018 Brazilian Journal of Oceanography
date: 2018-12-21
publication date: 2018-12-21
starting page: 301
ending page: 306
doi: 10.1590/s1679-87592018017806603