Keisy Aline Rodrigues, Christiane Sampaio de Souza, Janini Pereira, R. Schwamborn, Sigrid Neumann-Lietão, Paulo Oliveira Mafalda Jr
{"title":"Estudo Comparativo da Amostragem de Mesozooplancton em uma Região de Ressurgência de Quebra de Plataforma Continental","authors":"Keisy Aline Rodrigues, Christiane Sampaio de Souza, Janini Pereira, R. Schwamborn, Sigrid Neumann-Lietão, Paulo Oliveira Mafalda Jr","doi":"10.5914/tropocean.v49i1.249651","DOIUrl":"https://doi.org/10.5914/tropocean.v49i1.249651","url":null,"abstract":"O presente estudo objetiva verificar se redes cônicas, de tamanho de malha diferentes, têm a mesma eficiência para amostragem de mesozooplâncton em uma plataforma continental tropical estreita, com predomínio de Água tropical. A área de estudo também tem influência da circulação da Baía de Todos os Santos, com formação de Água Costeira, além de episódios de ressurgência de quebra de plataforma, com elevação da Água Central do Atlântico Sul. Para minimizar o efeito da sazonalidade as 4 campanhas de amostragem foram realizadas no outono, em 2013 (junho), 2014 (maio) e 2016 (abril e junho). Foi verificada baixa densidade de organismos com dominância de Copepoda, Larvacea e Chaetognatha, típico de áreas costeiras tropicais. Comparando-se as densidades totais de mesozooplâncton das diferentes malhas, obteve-se diferenças significativas, entre as redes de 200 µm e 500 µm (Teste de Kruskal-Wallis, p<0,05), e entre as de 300 µm e 500 µm (Teste de Kruskal-Wallis, p<0,05), devido a menor eficiência de captura da rede de 500 µm. Não foi encontrada diferença significativa entre as redes de 200 µm e 300 µm (Teste de Kruskal-Wallis, p>0,05), sendo ambas indicadas para amostragem de mesozooplâncton, em um ambiente nerítico tropical.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133733856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Características biométricas e Índices de condição da ostra-do-mangue Crassostrea rhizophorae (Guilding, 1828) do estuário do rio Ipojuca, PE, Brasil","authors":"Lucas L.S. Santana, C. Medeiros","doi":"10.5914/tropocean.v48i1.247361","DOIUrl":"https://doi.org/10.5914/tropocean.v48i1.247361","url":null,"abstract":"As sessile filters and bioaccumulators, oysters are good indicators of the health of estuaries. Changes in the morphological characteristics of its shells and the weight ratio of its flesh to the volume of its shell, etc. reflect the quality of the environment in which they live. The present work focuses on an evaluation of the conditions of the mangrove oyster Crassostrea rhizophorae in the estuary of the Ipojuca River, one of the most polluted in the country. For this purpose, 80 individuals from 4 areas of the Ipojuca river estuary were collected, in jan/2019 (post-spawning) and oct/2019 (spawning), weighted and measured. Based on these data, the shell thickness indices (STI1) and the AFNOR French standard quality index were calculated. Results revealed, on one hand, the occurrence of oysters commercially classifiable as “fine” and even “specials” in terms of their development and filling of their intervalval space. On the other hand, low values (< 4) of the STI1 monitoring index, a strong TBT contamination indicator, alerts to the need for future investigations to confirm these suspicions as well as to investigate the suitability or otherwise of Ipojuca oysters for human consumption.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129767012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Figueiredo, R. Schwamborn, A. Bertrand, Simone M. A. Lira
{"title":"New records of the mollusk Firoloida desmarestia Lesueur, 1817 (Gastropoda: Pterotracheidae) off Fernando de Noronha Archipelago and Northeastern Brazilian continental slope, Tropical Atlantic","authors":"G. Figueiredo, R. Schwamborn, A. Bertrand, Simone M. A. Lira","doi":"10.5914/tropocean.v48i1.247362","DOIUrl":"https://doi.org/10.5914/tropocean.v48i1.247362","url":null,"abstract":"Biogeographic and taxonomic knowledge on planktonic mollusks, specifically on Pterotracheoidea (also known as heteropods or sea elephants) in tropical oceans, is still incomplete. In this paper we report the first record of the heteropod Firoloida desmarestia Lesueur (1817) on waters off the Northeast Brazilian continental slope and Fernando de Noronha Archipelago and extend its geographic distribution in the tropical Atlantic. We provide new detailed digital image and descriptions of this highly fragile and transparent gelatinous species. Samples were taken in the context of the ‘ABRACOS’ (Acoustic along the Brazilian Coast) project using bongo nets. Out of 96 samples analyzed, six specimens were recorded in five samples, three at Fernando de Noronha, and three off the Northeast Brazilian coast. The present study extends the range of distribution of F. desmarestia to 3°S-9°Sin the western the Tropical Atlantic and highlights the importance of detailed studies on large-sized gelatinous plankton biodiversity in tropical oceans.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131327821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thays T. L. Santos, J. H. F. Serejo, H. P. Lima, S. A. Eschrique
{"title":"Dissolved nutrient fluxes in macrotidal estuary in the Amazonian region, Brazil","authors":"Thays T. L. Santos, J. H. F. Serejo, H. P. Lima, S. A. Eschrique","doi":"10.5914/tropocean.v48i1.247360","DOIUrl":"https://doi.org/10.5914/tropocean.v48i1.247360","url":null,"abstract":"This paper aimed to characterize the transport of dissolved nutrients through São Marcos Bay, in Brazilian Amazonian region, and to understand if it acts as a sink or a source of dissolved nutrients for the adjacent marine system of the region. Water sample collections were distributed in two profiles (P1 and P2) in different seasons: dry and rainy. River discharge, temperature, pH, salinity, dissolved oxygen and turbidity were measured in situ. Dissolved nutrients in the water, such as the nitrite, phosphate and silicate were determined with colorimetric method. During the dry season, when occured the flood tide in the estuary, salinity and pH increased and the other parameters decreased, because of the processes occurring in water are commonly connected by acid-base reactions and oxidation-reduction in the environment. During the rainy season the inverse process occurred, due to rainfall intensity in the region. All the nutrient fluxes had same variability in P1, both spatial and temporal, obtaining the highest values during the rainy season. Whereas P2 showed different variations of the fluxes, indicating that most nutrients that entered the estuarine were retained between profiles, suggesting that the São Marcos Bay acts predominately as a nutrient sink from the draining basin.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123339620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"SIMULATION OF OIL SPILLS NEAR A TROPICAL ISLAND IN THE EQUATORIAL SOUTHWEST ATLANTIC","authors":"S. Queiroz, Laila Fazekas, M. Silva, M. Araújo","doi":"10.5914/tropocean.v47i1.243115","DOIUrl":"https://doi.org/10.5914/tropocean.v47i1.243115","url":null,"abstract":"In this work we coupled the Ocean Modelling System - ROMS Regional Oceanic Circulation model with the MEDSLIK-II hydrocarbon dispersion model to simulate the evolution of accidental oil spills from tankers that travel near the Fernando de Noronha Archipelago in the tropical Southwest Atlantic. Six scenarios were evaluated, consisting of three spill positions on the eastern side of the Archipelago and two months (March and July). The results show that the predominance of advective forcings would tend to counteract the oil degradation processes and shorten the time window for possible mitigation actions. The worst scenario occurred in March with the plume reaching the island within 48 hours with 2.3% of the initial volume (1350 tonnes) adhering to the shore. The affected region is part of the Fernando de Noronha Marine National Park area. We propose the delimitation of a region between 3°41.9'S and 03°57'S and ~62 km perpendicular from the eastern limit of the FNA, restrictive to tanker traffic to increase the time window response in case of an oil spill.Keywords: Semi-lagrangian model, ROMS, MEDSLIK-II, Fernando de Noronha Archipelago, Oil wheathering.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127951662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matheus Cristóvão de Santana Freire, K. Freire, L. P. D. Rosa, Carolina Nunes Costa Bomfim
{"title":"Estrutura Populacional e Morfometria do camarão branco Litopenaeus schmitti (Burkenroad, 1936) capturado pela pesca artesanal em Sergipe, Brasil.","authors":"Matheus Cristóvão de Santana Freire, K. Freire, L. P. D. Rosa, Carolina Nunes Costa Bomfim","doi":"10.5914/tropocean.v47i1.242992","DOIUrl":"https://doi.org/10.5914/tropocean.v47i1.242992","url":null,"abstract":"O presente trabalho objetivou analisar a estrutura populacional do camarão branco Litopenaeus schmitti (Burkenroad, 1936) capturado pela pesca artesanal de arrasto em Sergipe e sua morfometria. O material biológico foi coletado mensalmente de janeiro/2015 a março/2016, exceto durante os defesos. De todos os indivíduos foram medidos o comprimento total (CT), o comprimento da carapaça (CC) e o peso total (PT), identificados o sexo e o estágio de maturação. Dos 191 indivíduos coletados, 81 foram machos e 110 fêmeas, resultando em uma proporção sexual de 0,7:1. O comprimento médio da carapaça para os machos foi 26,85±2,73 mm CC e para as fêmeas foi 29,97±5,28 mm CC. O peso médio foi 16,39±4,34 g e 20,55±9,51 g para machos e fêmeas, respectivamente. A relação entre o comprimento total e o comprimento da carapaça para machos e fêmeas foi CT=25,960+3,837CC e CT=33,199+3,502CC, respectivamente. A relação entre o peso total e o comprimento da carapaça foi PT=0,00303∙CC2,609 para machos e PT=0,00248∙CC2,642 para fêmeas. O maior exemplar amostrado foi uma fêmea com 52,50 mm CC, correspondendo ao maior indivíduo já registrado em Sergipe. Apenas 9,4% dos exemplares estavam imaturos. Essa é a primeira vez que a estrutura populacional dessa espécie é analisada diretamente na pesca de arrasto artesanal em Sergipe.Palavras-Chave: Pistola, tamanho máximo, análise morfométrica, peneídeo, relação peso-comprimento.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126908359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Silva, C. Noriega, J. Araujo, M. L. Koening, M. Araújo
{"title":"OCCURRENCE OF INTENSIVE BLOOMS OF CYANOBACTERIA Microcystis aeruginosa IN A TROPICAL ESTUARY","authors":"A. Silva, C. Noriega, J. Araujo, M. L. Koening, M. Araújo","doi":"10.5914/tropocean.v46i2.239348","DOIUrl":"https://doi.org/10.5914/tropocean.v46i2.239348","url":null,"abstract":"Samples were collected in a longitudinal profile from the Jaboatao River estuary, covering the marine area (estuarine plume) through four stations in the estuary and four in the plume during the dry and rainy seasons, with the objective of evaluating the occurrence and the distribution of Microcystis aeruginosa cyanobacterial blooms. In both regions, it is possible to observe the influence of M. aeruginosa on the local diversity, which was considered to range from very low to low where this species was dominant. M. aeruginosa represented on average 95% of the total cyanobacteria in the estuary, while in the plume, this percentage reached 65%. The species M. aeruginosa was responsible for the predominance of cyanobacteria, both in the estuary and in the plume. The N/P ratios in the estuary and the plume were <16:1, indicating N as a limiting factor. A key issue in eutrophication science is the potential for N-fixing cyanobacteria to compensate for any deficiency in biologically available N, principally during the dry period. The high-temperature, nutrient-rich and polluted waters with little oxygen contributed to the abundance and bloom formation of M. aeruginosa . The AOU positive values (average: +2.7 and +2.1 ml/L, for the wet and dry periods, respectively) indicate high respiration rates. Keywords: Cyanobacteria, Algal Blooms, Nutrients, Tropical Estuary, Brazil.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116103926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Isabelle Vilela, M. Araújo, P. Tyaquiçã, D. Veleda
{"title":"EMPIRICAL ORTHOGONAL FUNCTION ANALYSIS OF SATELLITE-DERIVED CURRENTS IN THE TROPICAL ATLANTIC","authors":"Isabelle Vilela, M. Araújo, P. Tyaquiçã, D. Veleda","doi":"10.5914/TROPOCEAN.V46I2.239346","DOIUrl":"https://doi.org/10.5914/TROPOCEAN.V46I2.239346","url":null,"abstract":"An Empirical Orthogonal Function (EOF) analysis was performed using 22 years of monthly surface currents in order to investigate the main modes of variability of the Tropical Atlantic surface circulation based on satellite data. The EOF1 of the zonal component captures more than 50% of the total variance and represents the central branch of the South Equatorial Current (cSEC). The EOF2 of the zonal component (~8% variance) represents a zonal dipole with a positive signal to the west, and a negative one to the east in the Atlantic Cold Tongue (ACT). The meridional EOF1 (18% variance), with alternating positive and negative structures in the western tropical North Atlantic, representing the high dynamics associated to the North Brazil Current retroflection and its anticyclonic eddies. The meridional EOF2 (~ 12% variance) represents the high variability of the NBC, with stronger intermittent signals propagating from the eastern Atlantic. In the EOF1 of currents speed predominates the cSEC pattern (30%) and the EOF2 (8%) represents the zonal dipole between South Atlantic Warm Pool and the ACT. These dominant modes of surface current variability contribute to the understanding of the ocean-atmosphere interaction processes, zonal and meridional transport variability, and the surface dynamics in the TA. Keywords: EOF Analysis, Remote Sensing, Ocean Currents, Oceanic Dynamics, Tropical Atlantic","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127447004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DISTRIBUIÇÃO DA MATÉRIA ORGÂNICA EM SEDIMENTOS SUPERFICIAIS DE UM ESTUÁRIO TROPICAL HIPEREUTROFIZADO (BACIA DO PINA - PE, BRASIL)","authors":"B. Costa","doi":"10.5914/tropocean.v46i2.239347","DOIUrl":"https://doi.org/10.5914/tropocean.v46i2.239347","url":null,"abstract":"Estuarios recebem aportes de materia orgânica (MO) de multiplas fontes. Esses aportes ficam registrados no sedimento, onde a MO se distribui nas fracoes granulometricas. O objetivo do presente trabalho foi avaliar a distribuicao da MO em sedimentos de um estuario tropical eutrofizado (Bacia do Pina - PE, Brasil). Amostras (n = 13) de sedimento foram coletadas em dezembro de 2014, processadas para separacao das fracoes granulometricas e analisadas quanto ao percentual de carbono inorgânico, carbono orgânico (CO), carbono total (CT) e concentracao de pigmentos fotossinteticos (clorofila + feopigmentos). A predominância de CO na composicao do CT sedimentar refletiu maiores aportes de MO de produtores primarios e fontes antropicas relativamente a producao secundaria de organismos bentonicos. A concentracao de pigmentos no sedimento foi reduzida e nao refletiu a eutrofizacao da area de estudo. Os produtos de degradacao dos pigmentos predominaram no sedimento, indicando que o microfitobentos nao contribuiu na composicao da MO sedimentar. O CO sedimentar se concentrou nas fracoes granulometricas silte e argila, que contiveram em media 88% do CO sedimentar. A distribuicao de CO no sedimento integral e na fracao areia fina foi regulada pelo percentual de lama no sedimento, refletindo o controle hidrodinâmico sobre a deposicao de particulas. Palavras-Chave: carbono orgânico, carbono inorgânico, clorofila, feopigmentos, eutrofizacao.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115372524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Carcinofauna associada ao fital Caulerpa racemosa (Forsskal) J. Agardh e Bryopsis spp. do Arquipélago de São Pedro e São Paulo - Brasil.","authors":"R. Silva","doi":"10.5914/tropocean.v46i1.237212","DOIUrl":"https://doi.org/10.5914/tropocean.v46i1.237212","url":null,"abstract":"O fital é um habitat marinho que serve de abrigo e alimentação para a fauna e a flora relacionadas a ela. O Arquipélago de São Pedro e São Paulo (ASPSP) possui uma alta biodiversidade e há muito do que se conhecer e explorar. Este trabalho amplia os conhecimentos dos crustáceos, sendo o primeiro a inventariar a carcinofauna associada ao fital do ASPSP. Foi encontrado um Alfeídeo Synalpheus, o Majídeo Mithraculus forceps (A. Milne Edwards, 1875), o Grapsídeo Plagusia depressa (Fabricius, 1775), o Nanocassiope melanodactyla (A. Milne-Edwards, 1867). Exemplares do gênero Amphitoe e Cymadusa. Hyale sp. Hyale macrodactyla Stebbing, 1899 e Elasmopus sp., Elasmopus brasiliensis (Dana, 1855), Elasmopus rapax Costa, 1853, E. pectenicrus (Bate, 1862), E. spinidactylus Chevreux, 1907 e Elasmopus brasiliensis (Dana, 1855). Os Isopoda Joeropsis sp. também apareceram nas amostras. Os Tanaidacea estiveram representados com exemplares de Psamokalliapseudes granulosus, Leptochelia dubia, Calozodion sp. e Pseudosphyrapus sp. O ASPSP possui um registro de 32 espécies de Crustáceos; com o presente trabalho tal lista de espécies cresce para 40, registrando mais oito novas ocorrências e dez novos gêneros que não foram possíveis de identificar em nível específico. Os Amphipoda, Isopoda e Tanaidacea citados são registrados pela primeira vez para o Arquipélago.","PeriodicalId":328321,"journal":{"name":"Tropical Oceanography","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127059540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}