Pelagic Organisms
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Species composition and abundance of the benthic community of Axiidea and Gebiidea (Crustacea: Decapoda) in the Marapanim Bay, Amazon estuary, northern Brazil
The thalassinideans (Axiidea and Gebiidea) encompasses approximately 615 species with reclusive habits, generally confined to extensive galleries burrowed into the sand or mud and, more rarely, in openings in reefs or the cavities of sessile animals such as sponges and coral. These species use the galleries for shelter, feeding and breeding, except during th
Zoologia (Curitiba). Publicado em: 2012-04
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2. Cyanobacteria from coastal lagoons of Southern Brazil: coccoid organisms
Considering the great ecological importance of the cyanobacteria and the need for more detailed information about these organisms in Brazilian waters, this paper provides taxonomic information about the unicellular cyanobacteria flora in lagoon systems along the coastal plains of Rio Grande do Sul State. Sampling was performed in different freshwater bodies
Braz. J. Bot.. Publicado em: 2012
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3. Cyanobacteria from coastal lagoons in southern Brazil: non-heterocytous filamentous organisms
This study describes and illustrates non-heterocytous filamentous cyanobacteria found in lagoon systems on the coastal plains of Rio Grande do Sul State. Collections were carried out in different freshwater bodies along the eastern (Casamento Lake area) and western (Tapes City area) margins of the Patos Lagoon (UTM 461948-6595095 and 542910-6645535) using a
Braz. J. Bot.. Publicado em: 2012
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4. Relação entre feições oceanográficas e distribuição de organismos pelágicos acusticamente detectados na costa do Brasil / Relationship between oceanographic features and acoustically detected pelagic organisms distribuition in the brazilian coast
Como típico ambiente marinho dominado por corrente de contorno oeste, a margem continental brasileira apresenta uma baixa produtividade biológica, especialmente no pelagial. Processos oceanográficos como frentes termais, vórtices e áreas de ressurgência determinam alterações nas características físico-químicas, através de processos de mistura e r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/09/2010
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5. Os Nematoda da plataforma continental da região sudeste brasileira sob a influência da Água Central do Atlântico Sul: Cabo Frio (RJ) e Ubatuba (SP) / The Nematoda of the continental shelf of the Brazil\ s southern region under the influence of the South Atlantic Central Water intrusion: Cabo Frio (RJ) and Ubatuba (SP)
Meiofauna is an important component of the marine benthic ecosystem as its densities are usually high in continental shelf sediments and respond quickly to environmental changes. Nematoda is the dominant group among meiofauna organisms, is highly diverse and can be used, as well as meiofauna, as a tool for natural and anthropogenic impacts monitoring. This s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/09/2009
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6. Influence of environmental conditions on health of engraulidid larvae collected in Santos (SP) / Influência do ambiente na higidez de larvas de engraulidídeos coletados na região de Santos (SP)
The aim of this study was to analyze influence of environmental conditions on health of engraulidid larvae of the continental shelf off Santos (24º49´S - 23º49´S e 46º55´W - 45º24´W). Samples were collected during two oceanographic cruises (September 2005 and March 2006). Differences among hydrographic conditions were verified between surveys: in Sep
Publicado em: 2008
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7. AVALIAÇÃO HIDROACÚSTICA DOS EFEITOS CAUSADOS POR BANCOS SUBMARINOS E ILHAS SOBRE A DISTRIBUIÇÃO E DENSIDADE ACÚSTICA DE ORGANISMOS PELÁGICOS, NA ZONA ECONÔMICA EXCLUSIVA DAS REGIÕES CENTRAL E NORDESTE DO BRASIL.
Seamounts are the main topographical features of the oceanic bottom. With a considerable range of heights and top depths, and a variety of substrata and different habitats, constitute important ecosystems. Along the Exclusive Economic Zone (ZEE) of the Central and Northeast coasts of Brazil several oceanic banks and islands exist and are the geographical are
Publicado em: 2006
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8. Antagonistic Interactions among Marine Pelagic Bacteria
Recent studies suggest that bacterial abundance and species diversity in the ocean's water column are variable at the millimeter scale, apparently in response to the small-scale heterogeneity in the distribution of organic matter. We hypothesized that bacterium-bacterium antagonistic interactions may contribute to variations in community structure at the mic
American Society for Microbiology.
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9. Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces
The fossil record of planktonic foraminifers is a key source of data on the biodiversity and evolution of marine plankton. One of the most distinctive foraminiferal taxa, Orbulina universa, widely used as a stratigraphic and paleoclimatic index, has always been regarded as a single species. Here we present a phylogenetic analysis of Orbulina small subunit rD
The National Academy of Sciences.
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10. Solar UVB-induced DNA damage and photoenzymatic DNA repair in antarctic zooplankton
The detrimental effects of elevated intensities of mid-UV radiation (UVB), a result of stratospheric ozone depletion during the austral spring, on the primary producers of the Antarctic marine ecosystem have been well documented. Here we report that natural populations of Antarctic zooplankton also sustain significant DNA damage [measured as cyclobutane pyri
The National Academy of Sciences of the USA.
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11. Larval spatial distributions and other early life-history characteristics predict genetic differentiation in eastern Pacific blennioid fishes.
In marine organisms, a pelagic larval stage increases the opportunities for long-distance dispersal and is often associated with little genetic differentiation over large geographical distances. Here we test the hypothesis that early life-history characteristics, including larval spatial distributions, affect the rates of dispersal and, therefore, the levels
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12. Release of Bacterial DNA by Marine Nanoflagellates, an Intermediate Step in Phosphorus Regeneration
The concentrations of dissolved DNA and nanoflagellates were found to covary during a study of diel dynamics of the microbial food web in the Adriatic Sea. This observation was further investigated in a continuous seawater culture when nanoflagellates were fed bacteria grown in filtered seawater. Analysis of dissolved organic phosphorus and dissolved DNA sho