Showing papers in "Brazilian Journal of Oceanography in 1982"
TL;DR: The southern boundaries of Tozeuma serratum A. Milne Edwards, Salmoneus ortmanni (Rankin) and Processa profunda Manning & Chace have been extended to Sao Paulo, Parana and Uruguay, and Latreutes parvulus (Stimpson), previously not known beyond Sao Paulo has been found to as far south as the Province of Buenos Aires.
Abstract: The southern boundaries of Tozeuma serratum A. Milne Edwards, Salmoneus ortmanni (Rankin) and Processa profunda Manning & Chace, previously known only from the northwestern Atlantic, have been extended to Sao Paulo, Parana and Uruguay, respectively. Latreutes parvulus (Stimpson), previously not known beyond Sao Paulo has been found to as far south as the Province of Buenos Aires. A systematic account of these four species is furnished, based mainly on material collected by the R/V "Prof. W. Besnard". The 16 species of Alpheoidea whose southern boundaries occur in warm-temperate shelf waters of eastern South America belong to two distinct faunal assemblages: (1) Tropical species - Alpheus floridanus Kingsley, A. intrinsecus Bate, A. normanni Kingsley, Salmoneus ortmanni (Rankin) Synalpheus longicarpus (Herrick), Ogyrides alphaerostris (Kingsley) (= O. occidentalis(Ortmann)), Exhippolysmata oplophoroides (Holthuis), Latreutes parvalus (Stimpson), Processa bermudensis (Rankin) and P. hemphilli Manning & Chace - which are largely restricted to coastal and inshore shelf waters less than 50 m deep; and (2) Subtropical species - Alpheus pouang Chris toffersen, A. puapeba Christoffersen, Merhippolyte americana Holthuis, Tozeuma serratum A. Milne Edwards, Processa guyanae. Holthuis and P. profunda Manning & Chace - which are largely restricted to the outer portion of the continental shelf within the studied area. Considering the temperature and distributional data available for each species, it is suggested that the poleward boundaries of O. alphaerostris are set by maximum summer temperatures of about 20oC required for the reproduction of the species, while the poleward boundaries of most of the tropical and subtropical species are set by minimum winter temperatures critical for their survival: about 15oC for A. floridanus, about 11oC for E. oplophoroides, about 9oC for A. pouang, L. parvulus, P. guyanae., P. guyanae and P. hemphilli, and P. profunda and about 8oC for A. puapeba and M. americana. It is further suggested that the shoreward boundaries of some of the subtropical species are set by maximum summer temperatures critical for their survival: about 20-22oC for A. puapzba and about 17-18oC for A. pouang and M. americana.
22 citations
TL;DR: Seasonal changes in phytoplankton populations in the chlorophyll-a concentration and on some environmental factors were studied monthly from June 1974 to September 1975 at Ubatuba, northern coast of Sao Paulo to indicate an oceanic contribution to the enrichment of the local water mass.
Abstract: Seasonal changes in phytoplankton populations in the chlorophyll-a concentration and on some environmental factors were studied monthly from June 1974 to September 1975 at Ubatuba, northern coast of Sao Paulo. Water temperatures ranged from 20oC in August to 29.5oC in March and salinities from 33.06 o/.. in March to 35.80 o/.. in January. The maximum salinity value observed in January near the bottom, associated with the thermal stratification found only during this month, seems to indicate an oceanic contribution to the enrichment of the local water mass. Pluviometric values ranged from 37.2 mm in August to 468.5 mm in January. Phytoplankton cell counts fluctuated from 64,000 to 1,028,000 cells/l and chlorophyll-a values varied from 0.52 to 6.86 µg/l. Maximum standing-stock was observed during summer, particularly in March, and it is probably associated with land drainage due to precipitation. A second bloom was observed in September 1975, and it is associated probably with the discontinuous impact of the wind. The phytoplankton populations were dominated by unidentified phytoflagellates, followed by diatoms and dinoflagellates. Nitzchia closterium and Thalassionema nitzschioides, along with Navicula sp., were the most representative species of diatoms. Among the dinoflagellates, Gymnodinium sp. was the most important. Blue-green algae and silicoflagellates were poorly represented. The diatoms Chaetoceros simplex, Chaetoceros spp, Nitzchia longissima, Nitzchia spp, Rhizosolenia delicatula and Rhizosolenia stolterfothi were found with high densities, only during bloom periods. The chlorophyll-a fractionation experiments demonstrated that organisms in size classe smaller than 20 µm represented, for all depths, between 54.93 and 98.15 o/.. of the total phytoplankton population.
20 citations
TL;DR: Analisou-se a validade da determinacao da idade individual de S. brasiliensis atraves do numero de aneis de crescimento de otolitos de exemplares coletados na area da costa brasileira entre 22oS (RJ) e 28oS (SC).
Abstract: Analisou-se a validade da determinacao da idade individual de S. brasiliensis atraves do numero de aneis de crescimento de otolitos de exemplares coletados na area da costa brasileira entre 22oS (RJ) e 28oS (SC). Foi comprovada a existencia de relacao linear entre raio do otolito e comprimento do peixe, periodicidade anual e epoca de formacao dos aneis (agosto), obedecendo a padroes definidos. Estimou-se parâmetros de crescimento dos otolitos ao longo da area estudada, estabelecendo-se quatro padroes distintos, que contituem mais um subsidio na caracterizacao das populacoes que existem na area.
13 citations
TL;DR: The results obtained for production rates (maximum of 204.6 mgC.m.hr-1 in winter and 488.3 mgC m-3.m-2.s-140 klux) are among the highest recorded for tropical marine environments as mentioned in this paper.
Abstract: Phytoplankton primary production and the maximum photo synthetic index (Pbm) from the region of Bay of Santos were measured every two months during 1976 by simulated incubations using 14C method and incandescent lamps (737 µE.m-2 .s-140 klux) . The results obtained for production rates (maximum of 204.6 mgC.m-3.hr-1 in winter and 488.3 mgC m-3.hr-1 in summer) are among the highest recorded for tropical marine environments. A high capability of light adaptation under high temperatures was also verified. The photo synthetic indexes obtained were also very high and seems to be due to the high nutrient level of the region. The eutrophic state is supported by the high nutrient and chlorophyll-a concentrations and by the phytoplankton cells number.
12 citations
TL;DR: Os resultados mostraram that B. cristatus mostrou ser uma especie omnivora, especializada em consumir Hyale media, apesar of, no local de coleta, ocorrerem muitas outras especies de Gammaridea.
Abstract: O presente estudo constitui-se numa analise preliminar do habito alimentar do peixe Blennius cristatus Linnaeus, comum nas pocas da zona entre-mares do litoral de Sao Paulo. As coletas foram realizadas na Praia do Poco, Itanhaem (24o12'S -48o47'W), litoral sul do Estado de Sao Paulo. A poca e rasa e mede 5,0-6,0 m de diâmetro, aproximadamente. O peixe foi capturado com anzol, usando-se, como isca, pedacos de camarao. Os resultados mostraram que B. cristatus utilizou sete itens alimentares: Alga, Decapoda-Reptantia, Mollusca, Amphipoda, Isopoda, Polychaeta e Bryozoa. Alem desses itens, foram encontrados ainda nos estomagos examinados, areia, muco e fragmentos calcarios. B. cristatus mostrou ser uma especie omnivora, especializada em consumir Hyale media, apesar de, no local de coleta, ocorrerem muitas outras especies de Gammaridea.
7 citations
TL;DR: The present work deals with twelve species of Sphaeromatidae from several substrata in the intertidal and shallow infralittoral zone in Sao Paulo and Rio de Janeiro States, Brazil.
Abstract: The present work deals with twelve species of Sphaeromatidae from several substrata in the intertidal and shallow infralittoral zone in Sao Paulo and Rio de Janeiro States, Brazil. Sand, stones, empty tests of barnacles, empty tubes of polychaete, byssus of mussels, oyster beds, macroscopic algae and sea grass (Spartina alterniflora) were collected and analysed. The following nomenclatural changes have been made: Pseudosphaeroma jakobii and Exosphaeroma platense are synonymyzed with Cassidinidea tuberculata; Pseudosphaeroma rhombofrontalis is placed in the genus Tholozodium; Paradynoides brasiliensis antonii with D. tropica. A key to species, the geographical distribution and notes on the habitat of the species are also furnished.
5 citations
TL;DR: The growth and the uptake rate for the diatom P. tricornutum were determined in function of nitrate and ammonium concentration and the fluorescence "in vivo" of thediatom culture was compared to the cell number in the culture growing at different concentrations and sources of nitrogen.
Abstract: The growth and the uptake rate for the diatom P. tricornutum were determined in function of nitrate and ammonium concentration. Also the fluorescence "in vivo" of the diatom culture was compared to the cell number in the culture growing at different concentrations and sources of nitrogen. The growth rate was determined as chlorophyll-a synthesis, cell number and inorganic carbon assimilation in the photosynthesis. The uptake rate was determined as nitrate and ammonium consumed. Inhibition on the 14C assimilation rate was observed with nitrate addition into the incubation flasks.
3 citations
3 citations
TL;DR: In this paper, seasonal differences in sigma-t (1.8)3 temperature (4.0oC) and salinity (0.9) were observed during February/June 1976 in the vicinity of Ilha Grande off the coast of Brazil Estimates of static and dynamic stability were made through the calculation of Brunt-Vaisala frequencies and Richardson numbers, respectively.
Abstract: Seasonal differences in sigma-t (1.8)3 temperature (4.0oC) and salinity (0.9‰) were observed during February/June 1976 in the vicinity of Ilha Grande off the coast of Brazil Estimates of static and dynamic stability were made through the calculation of Brunt-Vaisala frequencies and Richardson numbers, respectively. Both static and dynamic stability values were larger in February than in June for the same location and suggest a greater column stability in February than in June. Stations located in the northern and western channels of Ilha Grande, however, contained greater density reversals than to the east of the Island. Small scale dispersion studies were made using Rhomamine B dye to determine horizontal diffusion coefficients (K) east of the Island and in an embayment of the Island. The estimate for K was 9X103 cm2 s-1 east of the Island, about 2.6 times greater than the value estimated for the protected embayment.
2 citations
TL;DR: The colecta de un especimen de raya de la familia Rhinopteridae en el Caribe colombiano, el cual tiene 9 filas de dientes en ambas mandibulas, extendiendo its rango 7.300 km, de Rio de Janeiro hasta la Isla de Salamanca as mentioned in this paper.
Abstract: Se registra la colecta de un especimen de raya de la familia Rhinopteridae en el Caribe colombiano, el cual tiene 9 filas de dientes en ambas mandibulas. Este caracter lo incluye en la especie Rhinoptera brasiliensis Muller & Henle, extendiendo su rango 7.300 km, de Rio de Janeiro hasta la Isla de Salamanca. Se hacen comentarios sobre la talla de nacimiento y los habitos de la especie.
2 citations