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| Registros recuperados: 11 | |
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| Koening,Maria Luise; Eskinazi-Leça,Enide; Neumann-Leitão,Sigrid; Macêdo,Silvio José de. |
| A construção do Complexo Industrial Portuário de Suape, entre os anos de 1979/84, modificou as características ecológicas da área, sendo os maiores impactos observados no estuário do rio Ipojuca. Visando avaliar a ação desses impactos sobre a comunidade fitoplanctônica através da comparação com estudos realizados antes na área, foram analisadas amostras de plâncton coletadas em uma estação, durante um ciclo de 24 horas, nos períodos chuvoso (agosto/90) e seco (janeiro/91). As amostras foram coletadas pela técnica do fracionamento e com rede de plâncton de 65µm de abertura de malha. Coletas de parâmetros hidrológicos foram realizadas concomitantemente. Foram identificados 97 táxons, destacando-se como espécies muito freqüentes nos períodos chuvoso e seco:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fitoplâncton; Ecologia; Variação nictemeral; Impacto. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062002000400004 |
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| Cocentino,Adilma de Lourdes Montenegro; Fujii,Mutue Toyota; Reis,Thiago Nogueira de Vasconcelos; Guimarães-Barros,Nathalia Cristina; Rocha,Marcia de França; Neumann-Leitão,Sigrid. |
| Diversity and distribution pattern of the infralittoral green macroalgae at Potiguar basin, Rio Grande do Norte, Northeastern Brazil were analyzed from material collected at depths varying from 2 to 100 m. Collections were carried out with two types of dredges during four campaigns: July 2002, May and November 2003 and May 2004 at 43 stations. Chlorophyta is represented by 54 species, five varieties and three forms. The most representative family is Caulerpaceae, and the most diverse genus is Caulerpa, with 11 species. The results showed that most taxa (89%) are rare, and 10% are present at low frequencies. The most frequent species was Caulerpaprolifera (Forssk.) J.V. Lamour. occurring at almost all coastal and inner shelf stations, recorded in all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distribution patterns; Green macroalgae; Infralittoral; Tropical region; Brazil. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000400014 |
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| Melo Júnior,Mauro de; Schwamborn,Ralf; Neumann-Leitão,Sigrid; Paranaguá,Maryse N.. |
| The influence of tidal and diel changes on the exchange of Petrolisthes armatus planktonic larvae was studied at the Catuama inlet, which represents an intermediate system of marine and estuarine environments in the Northeast Brazil. To characterize the larval abundance and vertical distribution, samplings were carried out in August 2001 at neap tide and 3 stations, with 3 hours interval over 24 hours. Samples were taken at three or two depths at each station, with a plankton pump coupled to a 300 µm mesh size net. Petrolisthes armatus zoea I and II showed a mean of 26.3 ± 83.6 and 12 ± 38.8 ind m-3, respectively. During flood tides, the larvae were more concentrated in the midwater and surface, which avoided the transport to internal regions. In contrast,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Northeast Brazil; Decapod larvae; Petrolisthes armatus; Estuarine inlet; Transport; Zooplankton. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100009 |
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| Koening,Maria Luise; Leça,Enide Eskinazi; Neumann-Leitão,Sigrid; Macêdo,Silvio José de. |
| In order to address the impact on phytoplankton, sampling was conducted monthly at 4 fixed stations, from April/86 to March/87 at diurnal low and high tide using a plankton net (65 mum mesh size) and a 1 L Van Dorn bottle. Among the 133 taxa identified, marine littoral euryhaline species were most common, outranking Gyrosigma balticum (Ehrenberg) Rabenhorst, Nitzschia sigma (Kützing) Wm. Smith, Licmophora abbreviata Agardh, Climacosphenia moniligera Ehrenberg, Surirella febigerii Lewis, Terpsinoe musica Ehrenberg and Cylindrotheca closterium (Ehrenberg) Reiman and Lewis. The port construction caused significant changes to the phytoplankton community with a strong influence of marine species (mainly dinoflagellate) because of the opening of the reef near... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Phytoplankton; Environmental impacts; Estuary; Suape Port. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100012 |
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| Silva,Andréa Pinto; Neumann-Leitão,Sigrid; Schwamborn,Ralf; Gusmão,Lúcia Maria de Oliveira; Silva,Tâmara de Almeida e. |
| Mesozooplankton abundance and distribution at Suape Bay, Pernambuco, was studied to assess the impacts caused by the construction of an internal port to increase the capacity of the Suape Port Complex. Zooplankton sampling was done at 3 stations during the dry (November-December/1997) and rainy (April-May/1998) seasons. A plankton net with 300 µm mesh size was used. Wet weight plankton biomass ranged from 44 mg.m-3 to 3,638 mg.m-3. Forty-five macrozooplankton taxa were registered. The most abundant was Copepoda. Among copepods, Acartia lilljeborgi, Parvocalanus crassirostris, Oithona hebes, Corycaeus (C.) speciosus and Temora turbinata were most frequent. Minimum abundance was 9 ind.m-3 and maximum was 2,532 ind.m-3. Average species diversity was 2.55... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mesozooplankton; Copepoda; Human impacts; Suape Port Complex. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300020 |
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| Mayal,Elga Miranda; Neumann-Leitão,Sigrid; Feitosa,Fernando Antônio do Nascimento; Schwamborn,Ralf; Silva,Tâmara de Almeida e; Silva-Cunha,Maria da Glória Gonçalves da. |
| This study provides baseline information on the hydrological conditions and on the coral and plankton communities at the Maracajaú reef ecosystem (Northeastern Brazil). Studies were performed from February to June 2000, covering the transition from dry to rainy season. In this area, there is an offshore coral reef formation, where corals were observed in loco; the water samples were collected to obtain the hydrological and plankton data. Six scleractinian species were identified. Stable isotope analysis on the carbonate fraction of Favia gravida fragments showed that these corals were under severe thermal stress. Chlorophyll-a varied from 1.1 to 9.3 mg m-3, with higher values during the rainy season. Average zooplankton wet weight biomass were 117.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coral reefs; Hydrology; Plankton; Thermal stress; Human impacts. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300019 |
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| Cavalcanti,Eliane A. H.; Neumann-Leitão,Sigrid; Vieira,Dilma A. do N.. |
| Estudos sobre o mesozooplâncton foram realizados no sistema estuarino de Barra das Jangadas, Pernambuco, Brasil (8º14'36"S, 34º56'28"W) visando analisar a estrutura da comunidade. As amostras foram obtidas com rede de plâncton, com malha de 300 µm, durante os períodos, seco (janeiro/2001) e chuvoso (julho/2001), nas marés de sizígia e de quadratura, em intervalos de três horas. Foram identificados 37 taxa, destacando-se Copepoda com as espécies Pseudodiaptomus acutus (F. Dahl, 1894), Pseudodiaptomus richardi (F. Dahl, 1894), Acartia lilljeborgi (Giesbrecht, 1892), Parvocalanus crassirostris (Dahl, 1894), Oithona hebes (Santos, 1973) e Notodiaptomus cearensis Wright, 1936. A densidade total durante o período seco variou de 69,34 a 8.568,34 org.m-3. Para o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Estuário; Nordeste do Brasil; Zooplâncton. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000300008 |
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| Silva,Tâmara de Almeida e; Neumann-Leitão,Sigrid; Schwamborn,Ralf; Gusmão,Lúcia Maria de Oliveira; Nascimento-Vieira,Dilma Aguiar do. |
| Studies were carried out to assess the macrozooplankton small-scale temporal and spatial variability at three stations in three hours intervals, during 24 hours in July 1996 (rainy season) and December 1996 (dry season). A plankton net 300µm mesh size was hauled at surface during three minutes. Water samples for salinity, temperature, dissolved oxygen and pH were taken simultaneously with the zooplankton samples. Sixty-five macrozooplankton taxa were registered. Copepoda constituted the most common taxon and comprised 58% of the total zooplankton counts. Brachyuran zoeae, cirripedian larvae, Larvacea (Oikopleura dioica Fol, 1872), and Gastropoda veligers were abundant at some tidal cycles, mainly during the night. Species diversity average was 2.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diurnal variation; Estuary; Planktonic fauna; Tidal variation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000300012 |
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| Registros recuperados: 11 | |
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