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| Registros recuperados: 26 | |
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| Teixeira, Mariana Carolina; Universidade Estadual de Maringá; Rodrigues de Azevedo, Júlio César; Universidade Tecnológica Federal do Paraná; Pagioro, Thomaz Aurélio; Universidade Tecnológica Federal do Paraná / Universidade Estadual de Maringá. |
| Dissolved organic carbon (DOC) is nowadays recognized as the main substrate and source of energy for aquatic microbial community. The great part of available organic carbon for bacterioplankton might be formed after photolytic degradation of humic material, which constitutes the major part of DOC in almost all natural waters. The effects of DOC photo-degradation were evaluated, as was its utilization by bacterioplankton, through a two-step experiment, one involving photo-degradation of DOC and the other bacterial growth on the photo-degraded substrate. Photo-degradation was responsible for the consumption of 19% of DOC, reduced SUVA254, an increase in the E2/E3 and E3/E4 ratios, in addition to modifications in the fluorescence spectra that indicated a rise... |
| Tipo: Experimento |
Palavras-chave: 2.05.00.00-9 dissolved organic carbon; Bacterioplankton; Photo-degradation; Experiment Ecologia. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/11054 |
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| Ribeiro,Catherine Gérikas; Kolm,Hedda Elisabeth; Costa Machado,Eunice da. |
| In this work, the density of bacterioplankton, bacterial biomass and environmental variables were monitored in two seasons (summer and winter), two times each month (spring tide and neap tide sampling), over a 12 h period, comprising a tidal cycle (semidiurnal), from subsurface and bottom waters, in a fixed station in the Estuarine Turbidity Maximum Zone (ETMZ) of Paranaguá Bay, Brazil. The data were treated with multivariate analyses methods in order to indentify the key controlling factors of the bacterial community dynamics. The microbial community seemed to be structured by a close relationship with the nutrients concentration, mainly by total phosphorous and nitrate. Regardless of variations throughout the tidal cycles, free-living bacteria had a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterioplankton; Estuarine Turbidity Maximum Zone; Free-living bacteria; Attached bacteria; Paranaguá Bay. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500012 |
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| Gonçalves,Rodrigo J; Souza,María Sol; Aigo,Juana; Modenutti,Beatriz; Balseiro,Esteban; Villafañe,Virginia E; Cussac,Víctor; Helbling,E Walter. |
| In the last decades, both temperature and UVB (280-315 nm) radiation on the surface of the Earth increased at growing rates as a result of human activities. Many studies had evaluated the effects of temperature on aquatic ecosystems, but now the field broadens as the combination and variations of temperature and radiation gains especial importance. In this work we attempt to revisit some of our knowledge about the effects of UVR and temperature on marine and freshwater plankton and fish from temperate regions (defined here as latitudes between 30-60º), especially from the Patagonia area, due to the special characteristics found in these sites. UVR affects (often negatively) almost all processes, from carbon fixation to behavior; and certainly all trophic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Bacterioplankton; Phytoplankton; Zooplankton; Fish; Oxidative stress; Upper mixed layer. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000200005 |
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| Modenutti,Beatriz; Albariño,Ricardo; Bastidas Navarro,Marcela; Díaz Villanueva,Verónica; Souza,María Sol; Trochine,Carolina; Laspoumaderes,Cecilia; Cuassolo,Florencia; Mariluán,Gustavo; Buria,Leonardo; Balseiro,Esteban. |
| North Andean Patagonian aquatic systems include a number of deep and shallow oligotrophic lakes with a profuse hydrographic net. In this contribution we present a review of the researches carried out during the last decade in the food webs of North Patagonian water bodies. Food webs in these systems were studied based on field surveys, combining with field and laboratory experiments. Deep and shallow lakes were analyzed in relation to light, organic matter, and nutrient constraints as limiting interacting factors. In addition, we have also extended our knowledge on the structure and dynamics of stream food webs by analyzing different aspects of biotic interactions occurring both through the autotrophic and heterotrophic pathways. Since Andean lakes were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterioplankton; Phytoplankton; Zooplankton; Fish; Insects; Lakes and rivers. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000200003 |
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| Рылькова, О. А.; Поликарпов, И. Г.; Сабурова, М. А.. |
| Проведены сравнительные исследования общей численности бактерий (ОЧБ) различными методами. В качестве красителей для окраски бактерий использовали эритрозин (Э) и флуорохромы (Ф): акридин оранжевый (АО) и профлавин. Материалами для работы послужили пробы, собранные в различных районах Черного моря в течение всего годового цикла: в 37 рейсе НИС «Профессор Водяницкий» (июль 1992 г., глубоководная часть с/в части Черного моря); в 43 рейсе НИС «Профессор Водяницкий» (сентябрь 1993 г., шельфовая зона, центральная часть и свал глубин с/з части Черного моря, центр западной халистазы); в эстуарии р. Черной (апрель 1994 г.); в Севастопольской бухте (февраль-март 1998 г.); во 2 рейсе НИС «Горизонт» (июнь 1998 г., шельфовая зона Крыма); в 11 рейсе НИС «Диорит»... |
| Tipo: Journal Contribution |
Palavras-chave: Бактериопланктон; Флуорохромы; Эритрозин; Акридин; Профлавин; Bacterioplankton. |
| Ano: 2003 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/586 |
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| Mostajir, Behzad; Roques, Cecile; Bouvier, Corinne; Bouvier, Thierry; Fouilland, Eric; Got, Patrice; Le Floc'H, Emilie; Nouguier, Jean; Mas, Sebastien; Sempere, Richard; Sime-ngando, Telesphore; Troussellier, Marc; Vidussi, Francesca. |
| The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'), and 2 contained natural water with Atherina spp. ('Fish'). Abundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. Two MFW indices, the microbial autotroph: heterotroph C biomass ratio (A:H) structural index and the gross primary production: respiration ratio (GPP:R) functional index, were defined. In the Fish mesocosms, selective... |
| Tipo: Text |
Palavras-chave: Microbial food web; Virioplankton; Bacterioplankton; Phytoplankton; Protozooplankton; Crassostrea; Atherina; Autotrophy; Heterotrophy. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00284/39489/73675.pdf |
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| Crottereau, C; Delmas, Daniel. |
| In order to estimate in situ bacterial exoproteolysis and its contribution to bacterial secondary production (BSP), we studied microbial activities (BSP and kinetics of exoproteolytic activity) in relation to dissolved combined amino acids (DCAA) during the survey of an Atlantic marine pond. In this pond, high concentrations of DCAA (mean = 4.27 mu M), probably generated by zooplankton grazing, allowed large bacterial biomass development and high production (max = 10(11) cells l(-1) and 18.8 x 10(9) cells l(-1) d(-1) respectively). Exoproteolytic enzyme activity (mean V-m = 55.9 mu M d(-1)) was tightly cou pled to bacterial production, suggesting that protein utilization was essential for bacterial growth. Calculation, according to the Michaelis-Menten... |
| Tipo: Text |
Palavras-chave: Bacterioplankton; In situ exoproteolytic hydrolysis rate; Kinetic parameters; DCAA; Marine pond. |
| Ano: 1998 |
URL: https://archimer.ifremer.fr/doc/00446/55803/62288.pdf |
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| Lucas, Ronan; Courties, C.; Herbland, Alain; Goulletquer, Philippe; Marteau, Anne-laure; Lemonnier, Hugues. |
| In tropical shrimp ponds, the increasing of feed input, concomitantly with the stocking shrimp biomass, induces an eutrophication of the ecosystem. Although difficult to maintain, its stability is required to guarantee the success of the culture. A 110-day period of phytoplankton and bacterioplankton stock and dynamics in an earthen pond (1.2 ha area, 1 m depth) was monitored using flow cytometry to provide baseline information on community characteristics and ecosystem instability. Seven autotrophic cell types were identified over the whole sampling period. Prokaryotic cells included Synechococcus sp., a group named UNK which presented an atypical new flow cytometric signature and picoeukaryotes (PEUK). Nanophytoplankton cells were represented by 4... |
| Tipo: Text |
Palavras-chave: Tropical shrimp aquaculture; Ecosystem shift; Phytoplankton; Bacterioplankton; Vibrio; Flow cytometry. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00029/14068/11312.pdf |
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| Registros recuperados: 26 | |
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