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| Registros recuperados: 101 | |
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| Vilhena,Maria do Perpetuo Socorro Progene; Costa,Marcondes Lima da; Berrêdo,José Francisco; Paiva,Rosildo Santos; Almeida,Pryscila Denise. |
| Phytoplankton is important bioindicator of chemical and biological modifications of natural ecosystems. The objective of this study was to determine the total chemical composition of the phytoplankton of the Pará and Mocajuba estuaries on the eastern coast of the Amazon region in the Brazilian state of Pará. The chemical composition of the surface water, bottom sediments (total sample and bioavailable fraction), and the phytoplankton were determined by inductively coupled plasma optical emission spectrometry. Phytoplankton contained high concentrations of Ca, P, Mn, Fe, Zn, Al, Ba, and Pb. The phytoplankton of the Mocajuba estuary is rich in Fe (2,967-84,750 µg g-1), while those from the Pará is rich in Al (1,216-15,389 µgg-1), probably reflecting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sediments; Trace metals; Plankton; Surface water. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400012 |
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| Moreira, Ricardo Lafaiete; Universidade Federal do Ceará; Silveira, Lucas Pinheiro; Universidade Federal do Ceará; Teixeira, Erivânia Gomes; Universidade Federal do Ceará; Moreira, Antonio Glaydson Lima; Universidade Federal do Ceará; Moura, Plácido Soares de; Universidade Federal do Ceará; Farias, Wladimir Ronald Lobo; Universidade Federal do Ceará. |
| The adequate diet of Nile tilapia in their growth early stages is fundamental to the success of culture subsequent stages. The goal of the present work was to evaluate the Nile tilapia growth fed with different diets, and to morphometrically characterized the gastrointestinal tract of this species. The treatments consisted of three diets: (D1) natural food, (D2), commercial feed and (D3) commercial feed + natural food. In the qualitative phytoplankton analysis, there was greater representation of the genus Chlorella, while zooplankton community analysis revealed greater number of Brachionus rotifer. Growth and survival in D2 and D3 did not reveal differences (p > 0.05), while in D1, the results were significantly lower (p < 0.05). The... |
| Tipo: Pesquisa de campo; análise laboratorial |
Palavras-chave: Ciências Agrárias / Engenharia de Pesca Oreochromis; Diets; Natural food; Plankton; Digestive tract. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/13327 |
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| Silva, Mariana Lessa Carneiro da; Rangel, Elisangela Reis; Lansac-Tôha, Fabio Amodêo; Schwind, Leilane Talita Fatoreto; Joko, Ciro Yoshio. |
| The pictorial key contributes to taxonomic analysis, as it lists the species found in a given environment, and points out the morphological characteristics that differs one specific taxon from the others. Arcellidae Ehrenberg, 1830 is one of the testate amoebae families with highest representativity in terms of richness and abundance, including three genera, that Arcella shows greater dispersion in different types of aquatic biotopes. The zooplankton community in the Paranoá Lake has been extensively studied over the decades. However, there are no studies on testate amoebae in this environment. The study aimed to develop a pictorial key to help in the identification of Arcella in the Paranoá Lake. Samples were taken with plankton net at 13 sites in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.04.05.00-6 protist; Taxonomy; Biological diversity; Plankton; Arcellidae; Center west Taxonomia dos Grupos Recentes. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/29187 |
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| Galdioli, Eliana Maria; Hayashi, Carmino; Soares, Claudemir Martins; Soares, Telma; Wolff, Liu. |
| Aiming to study the changes in the diet of Astyanax altiparanae in the early developmental stages, in the presence of Eichhornia crassipes (EC) and Lemna sp. (LM), larvae of Astyanax altiparanae were stocked in eight tanks of 900 L (500 ind. tank-1), four with EC and four with LM covering 50% surface. Tanks were inoculated with plankton and received 3.0 g inorganic fertilizer (NPK-7:14:8) and 1.5 g every week. At every three days, three larvae were taken from each tank, fixed in 4% formaldehyde and grouped into four age classes (I: 6 to 12 days, II:15 to 21 days, III:24 to 30 days; IV:33 to 39 days). The analysis of dominance and frequency of occurrence (FO) of food items indicated that, at this stage, A. altiparanae is generalist. In class I, there was a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.00.00.00-6 fish larvae; Floating macrophyte; Plankton; Larval development; Diet. 2.05.03.00-8. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/32102 |
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| MELO,PEDRO A.M.C.; MELO JÚNIOR,MAURO DE; MACÊDO,SILVIO J. DE; ARAUJO,MOACYR; NEUMANN-LEITÃO,SIGRID. |
| The Saint Peter and Saint Paul Archipelago (SPSPA) are located close to the Equator in the Atlantic Ocean. The aim of this study was to assess the spatial variations in the copepod community abundance, and the biomass and production patterns of the three most abundant calanoid species in the SPSPA. Plankton samples were collected with a 300 µm mesh size net along four transects (north, east, south and west of the SPSPA), with four stations plotted in each transect. All transects exhibited a tendency toward a decrease in copepod density with increasing distance from the SPSPA, statistically proved in the North. Density varied from 3.33 to 182.18 ind.m−3, and differences were also found between the first perimeter (first circular distance band) and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oligotrophic; Plankton; St. Peter and St. Paul archipelago; Tropical; Upwelling. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401719 |
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| Bagatini,Inessa Lacativa; Spínola,Ana Lúcia Gerardi; Peres,Bianca de Miranda; Mansano,Adrislaine da Silva; Rodrigues,Mafalda Alexandra Antunes; Batalha,Marco Antônio Portugal Luttembarck; Lucca,José Valdecir de; Godinho,Mirna Januária Leal; Tundisi,Takako Matsumura; Seleghim,Mirna Helena Regali. |
| Protozooplankton is an important component of the aquatic microbial food webs and its composition, density, and distribution reflect the chemical, physical, and biological aspects of the environment. Considering the scarce literature on freshwater protozoans in Brazil and on protozoan ecology in subtropical environments, we listed the ciliates and amoebae taxa found in 13 water bodies in São Paulo State and analyzed their abundance in relation to the environmental variables. We collected two samples in each environment, fixed immediately with mercuric chloride and stained with bromophenol blue. After microscopical analysis, 74 protozoan genera were identified and the Ciliophora were dominant in the majority of the environments. The Stichotrichia,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciliates; Amoebae; Plankton; Environmental variables; Freshwater. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400152 |
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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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| Pereira,Luci Cajueiro Carneiro; Jiménez,José Antonio; Koening,Maria Luise; Porto Neto,Fernando F.; Medeiros,Carmen; Costa,Rauquírio Marinho da. |
| A study of the structure of the plankton community along the coastal zone of the Casa Caiada-Rio Doce area (Pernambuco, Brazil) is presented. The results obtained indicated that in the protected zones the water presented high turbidity, high temperature, low salinity and high nutrient and oxygen rates. All of these conditions were responsible for the reduction in plankton diversity and an increase in the biomass of the most opportunistic (r-strategist) species e.g. Gyrosigma balticum and Bacillaria paxillifera (Phytoplankton) and Euterpina acutifrons (Zooplankton). The differences found with respect to others area studies performed in pristine conditions indicated that plankton structure could be used as an environmental health indicator and that, in this... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plankton; Sheltered areas; Environmental indicators. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800018 |
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| Scheffer, Marten; Wageningen Agricultural University; Marten.Scheffer@wur.nl. |
| Despite the huge scientific progress of the last century, the dynamics of complex systems such as the atmosphere, human societies, and ecosystems remain difficult to understand and predict. Nonetheless, our ability to carve the future depends largely on our insight into the functioning of such complex systems. Complex systems are the focus of considerable mathematical theory. Rather than referring to any particular part of the world, such theory addresses what seems to be another world: a world of strange attractors, catastrophe folds, torus destruction, and homoclinic bifurcations. So disparate is the language and notation in this discipline that it is hard to imagine that it has any thing to do with reality as we know it. Indeed, it deals with a kind of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Bifurcation; Catastrophe; Chaos; Cycle; Daphnia; Fish; Macrophyte; Model; Multiple stable states; Plankton; Predation; Trophic cascade. |
| Ano: 1999 |
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| Казанкова, И. И.; Немировский, М. С.. |
| Установлено, что фенология личинок Bivalvia в поверхностных и глубинных горизонтах в прибрежных водах Севастополя различна, что может быть связано с особенностями температурного режима верхних и нижних слоев, а также наличием в обследуемом районе двух разнонаправленных течений. Обнаружено соответствие вертикального распределения планктонной и бентосной частей популяций двустворок. В целом, для весеннего периода характерна новая генерация личинок Mytilus galloprovincialis (скальных и иловых популяций), Cerastoderma glaucum, Acanthocardia pauсicostata, Parvicardium exiguum, Mya arenaria, Abra sp., Fabulina fabula и Loripes lucinalis. Великонхи A. pauсicostata, P. exiguum, M. arenaria, а также Modiolus phasealinus в черноморском планктоне идентифицированы... |
| Tipo: Journal Contribution |
Palavras-chave: Планктон; Личинки Bivalvia; Мидия; Акантокардиум; Динамика численности и вертикальное распределение личинок; Plankton; Larvae of Bivalvia; Mussel; Acanthocardium; Dynamiс of larval number; Vertical larval distribution Plankton Plankton http://aims.fao.org/aos/agrovoc/c_5950. |
| Ano: 2003 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/156 |
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| Tokarev, Yu.; Mel'nikov, V.; Burmistrova, N.; Belokopytov, V.; Temnykh, A.. |
| Researches in the bioluminescence field vertical structure, amplitude characteristics and spatial distribution in the Black Sea have been conducted in IBSS, NAS of Ukraine, from up to the present time. Enough evidencies are available to testify dramatic changes in different Black sea ecosystem components including bioluminescence field parameters, which took place last decades. But still there is no direct answer to the question about the reasons for such transformations, as variability of the Black Sea biophysical (bioluminescence) and biological characteristics at the climatic time scales, i.e. at the scale of decade periods are not sufficiently studied now. The most pronounced changes in vertical structure of the bioluminescence field are observed in... |
| Tipo: Proceedings Paper |
Palavras-chave: Climate changeability; Cold intermediate layer; Bioluminescence; Plankton. |
| Ano: 2008 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/694 |
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| Registros recuperados: 101 | |
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