Consulta: subjectFacets:"Vertical distribution"
Registros recuperados: 42
Data/hora: 08/06/2024 18:34:14

Вертикальное распределение и суточные вертикальные миграции остракод Южной Атлантики
Provedor de dados: 13
Autores: Драпун, И. Е.
Исследовано вертикальное распределение и особенности суточных вертикальных миграций остракод в слое 0 - 500 м в разных районах южно-атлантического субтропического круговорота. Рассчитаны коэффициенты интенсивности миграций (К500) 16 массовых видов остракод с 7 суточных станций,  а также К500 самок, самцов и разновозрастных личинок трех наиболее многочисленных видов - Mikroconchoecia curta, Discoconchoecia elegans и Obtusoecia antarctica. У видов с широкими ареалами  наибольшие К% наблюдались в южной части Бразильского течения. Показано влияние слоя скачка температуры и солености на величину К500. С уменьшением градиентов в слое скачка интенсивность миграций усиливалась. К слою скачка также приурочен максимум обилия остракод в верхнем 500-метровом слое....
Tipo: Journal Contribution
Palavras-chave: Остракоды; Южно-атлантический субтропический круговорот; Вертикальное распределение; Суточные вертикальные миграции; Коэффициент интенсивности миграций; Ostracods; South-Atlantic subtropical circulation; Vertical distribution; Daily vertical migrations; Coefficients of migration intensity Vertical migrations.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/409

Diel vertical migration of predators (planktivorous fish larvae) and prey (zooplankton) in a tropical lagoon
Provedor de dados: 76
Autores: Mendonça,Marcos Marques; Picapedra,Pablo Henrique dos Santos; Ferronato,Michelli Caroline; Sanches,Paulo Vanderlei.
ABSTRACT Based on the hypothesis that diel vertical migration (DVM) is a mechanism of predator avoidance, the objective of the present study was to test for the occurrence of DVM in planktivorous fish larvae of Hypophthalmus edentatus (Spix, 1829) (Siluriformes, Pimelodidae) and Plagioscion squamosissimus (Heckel, 1840) (Perciformes, Sciaenidae), and zooplankton (rotifers, cladocerans and copepods) in an isolated tropical lagoon in the floodplain of the Upper Paraná River, Brazil (region of Parque Nacional de Ilha Grande). We investigated spatial overlap between predators (planktivorous fish larvae) and prey (zooplankton), and tested which physical and chemical variables of the water are related to the DVM of the studied communities. We performed nocturnal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vertical distribution; Spatial overlap; Predator-prey interactions; Rotifers; Microcrustaceans.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000200174

Spatial and temporal variability of the pico- and nanophytoplankton and bacterioplankton in a deep Polynesian atoll lagoon
Provedor de dados: 5
Autores: Thomas, Y.; Garen, Pierre; Courties, C.; Charpy, L.
Spatial and temporal scales of variability in phyto- and bacterioplankton abundance were investigated in a deep atoll lagoon (Ahe, French Polynesia), Ahe Lagoon showed a classical phytoplankton composition, but its picophytoplankton (Prochlorococcus, Synechococcus and picoeukaryotes) concentrations are higher than the mean for Polynesian atoll lagoons. Phyto- and bacterioplankton descriptors were highly variable, with mean CVs of &gt;20% in most cases: day night, day-to-day, vertical, lagoonal and seasonal. Phytoplankton biomass, which was estimated by in vivo fluorescence, was higher in the deep layer than in the upper layer. This pattern was detected on a day night scale, showing transitory vertical gradients, and through long-term events that were...
Tipo: Text
Palavras-chave: Flow cytometry; Picophytoplankton; Nanophytoplankton; Bacterioplankton; Vertical distribution; Day-to-day dynamics; Large-scale heterogeneity; Deep atoll lagoon; French Polynesia.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11425/7963.pdf

One-dimensional biophysical modelling of fish egg vertical distributions in shelf seas
Provedor de dados: 5
Autores: Petitgas, Pierre; Magri Hoeltzener, Stephanie; Lazure, Pascal.
Modelling the vertical distribution of fish eggs is important when assessing fish stocks with egg production methods and for monitoring the reproductive potential of fish populations. Fish eggs are passive particles and their vertical distribution is determined by a few parameters such as egg density, egg diameter, wind- and tide-induced turbulence, and vertical hydrographic structure. A one-dimensional vertical biophysical, numerical model was developed which was adapted to the hydrography of shelf seas under the influence of tidal currents, wind-induced circulation, and river discharges. The biological part of the model parameterized the ascent velocity of the egg as a function of egg properties (diameter, density) and water properties (density,...
Tipo: Text
Palavras-chave: Vertical distribution; Sprat; Sardine; Fish egg buoyancy; CUFES; Biophysical coupling; Anchovy.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2277.pdf

Short-scale temporal variability of physical, biological and biogeochemical processes in the NW Mediterranean Sea: an introduction
Provedor de dados: 5
Autores: Andersen, V.; Goutx, M.; Prieur, L.; Dolan, J. R.
In the framework of the PROOF-PECHE project (http://www.obs-vlfr.fr/proof/vt/op/ec/peche/pec.htm) a multi-disciplinary team performed experiments and collected samples during the DYNAPROC2 cruise aboard the RV Thalassa from September to October in 2004. The cruise provided data on the functioning of the pelagic food web by sampling over a month long period in the NW Mediterranean Sea at a fixed station subject to weak horizontal advection currents during a period of hydrological stability. This paper describes the background of the cruise and provides an overview of the results derived from the campaign which constitute the special section. The major objective of the cruise was to assess the relative importance and variability of the pathways of carbon in...
Tipo: Text
Palavras-chave: Spring bloom; Zooplankton community; Vertical distribution; Surface layer; Wind events; Bacterial communities; Food web; Transition; Oligotrophy; Abundance.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00092/20315/17954.pdf

Seasonal and inter-annual variability of bacterioplankton biomass at station Kerfix, off Kerguelen Islands, Antarctica
Provedor de dados: 5
Autores: Delille, D.
Between January 1992 and March 1995, the research project Kerfix undertook the first regular non-coastal multiyear acquisition of parameters related to the carbon cycle in the Southern Ocean at a time series station located at 50degrees40'S-68degrees25'E, 110 km southwest of the Kerguelen Islands. I present here a general overview of the bacteriological data collected during this survey. Bacterioplankton biomass at Kerfix station was always significantly lower than in the direct vicinity of the Kerguelen Islands. Bacterial abundance decreased from surface to deepest layers (from 10(6) cells ml(-1) in surface layer to 5.0 x 10(4) cells ml(-1) at 1500 m). In contrast, mean cell volume (0.1 mum(3)) and proportion of free-living bacteria (80%) were relatively...
Tipo: Text
Palavras-chave: Océan Antarctique; Biomasse bactérienne; Distribution verticale; Variations saisonnières; Variabilité interannuelle; Antarctic ocean; Bacterial biomass; Vertical distribution; Seasonal changes; Interannual variability.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43268/42999.pdf

Mid-water zooplankton profiles from the temperate ocean and partially landlocked seas. A re-evaluation of interoceanic differences
Provedor de dados: 5
Autores: Weikert, H; Koppelmann, R.
Differences in the vertical distribution of bathypelagic zooplankton in the open northeast Atlantic and in the partially landlocked Levantine and Red Seas were re-evaluated to provide an interoceanic comparison. The decrease in zooplankton abundance with depth was most pronounced in the Red Sea and least evident in the northeast Atlantic. The Levantine Sea showed intermediate characteristics. The data plotted on a semi-log scale against a linear change in depth revealed a reduced rate of decrease in the zooplankton concentration with depth in the deep bathypelagic zone of the northeast Atlantic and the Levantine Sea. This pattern was also found for vertical profiles of micronekton abundance in the southeast Pacific. In the Red Sea, the decrease was...
Tipo: Text
Palavras-chave: Bathypelagic zooplankton; Interoceanic comparison; Vertical distribution; Vertical flux.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20733/18370.pdf

Seasonal abundance and vertical distributions of macroplankton and micronekton in the Northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Sardou, J; Etienne, M; Andersen, V.
Based on monthly samplings over an entire year, variations of abundance, vertical distributions and diel vertical migrations are described in the 0-1000 m water column in a coastal area of the Northwestern Mediterranean Sea for the main pelagic invertebrates. Detailed results are given for 21 species of macrozooplankton and micronekton. On an annual basis, the most numerous species by numbers comprised the euphausiid Meganyctiphanes norvegica, the pteropod Cavolinia inflexa, the siphonophores Abylopsis tetragona and Chelophyes appendiculata, the crustacean decapods Sergestes arcticus and Pasiphaea sivado, and the salps Salpa fusiformis and Thalia democratica. Species of the same genus, such as Sergestes arcticus, S. corniculum and S. robustus or Pasiphaea...
Tipo: Text
Palavras-chave: Seasonal cycle; Vertical distribution; Macroplankton; Micronekton.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20732/18369.pdf

The Underwater Vision Profiler 5: An advanced instrument for high spatial resolution studies of particle size spectra and zooplankton
Provedor de dados: 5
Autores: Picheral, Marc; Guidi, Lionel; Stemmann, Lars; Karl, David M.; Iddaoud, Ghizlaine; Gorsky, Gabriel.
The Underwater Vision Profiler (UVP) was developed to quantify the vertical distribution of macroscopic particles and zooplankton &gt; 100 mu m in size. The smaller size limit is fixed by optical resolution, whereas the larger size limit is determined by the volume of water illuminated per image. The new fifth generation instrument (UVP5) is compact (30 kg in air) and operates either as a stand-alone instrument with an independent power supply for use on a mooring or free-drifting array, or as a component of a Conductivity, Temperature, and Depth (CTD)-rosette package. Images are recorded at a frequency up to 6 Hz. If the UVP5 is interfaced with a CTD, these images are acquired and analyzed in real time. Images are recorded every 20 cm at the 1 m s(-1)...
Tipo: Text
Palavras-chave: Video plankton recorder; Marine snow; MU-M; Vertical distribution; Aggregate dynamics; In situ; System; Ocean; Flux; Phytoplankton.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00133/24413/22426.pdf

Role des bacteries phototrophes anoxygeniques dans une partie stratifiee d'une lagune tropicale (Lagune Ebrie, Cote d'Ivoire)
Provedor de dados: 5
Autores: Caumette, P.
In the deepest parts of the estuarine region of Ebrie Lagoon (Abidjan Africa, (5 degree N, 4 degree W) stratified conditions have been observed during the rainy season (May to Nov.), owing to salinity differences between oxic and anoxic layers. At the interface, 3-4 m depth, phototrophic bacteria (Chromatium, Chlorobium and Pelodictyon ) developed, forming a brown layer due to their different pigments. Their production has been estimated at 41% of the total photosynthetic production during high stratification (Sep. 1981) and their biomass was used by the copepod population for 40 to 60% of its diet. During the dry season, the water column became homogeneous and oxygen was detected to 6m depth. The brown layer of phototrophic bacteria disappeared, as well...
Tipo: Text
Palavras-chave: Chlorobium; Chromatium; Primary production; Photosynthesis; Estuaries; Seasonal variations; Plankton; Stratification; Vertical distribution; Bacteria; Coastal lagoons; Trophic relationships; Biomass.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-957.pdf

Vertical distributions of macroplankton and micronekton in the Ligurian and Tyrrhenian Seas (northwestern Mediterranean)
Provedor de dados: 5
Autores: Andersen, V; Francois, F; Sardou, J; Picheral, M; Scotto, M; Nival, Paul.
Vertical distributions and diel migrations at nineteen stations located in the Ligurian and Tyrrhenian Seas (northwestem Mediterranean) are described in detail and compared for the main species of micronekton and macroplankton. Sampling was performed in April 1994 in the 0-700 m water column in most cases, down to 350, 450 or 550 m for the coastal or relatively shallow sites. Most of the twenty species showed similar distributions throughout the sampled area, either non-diel-migrating distributions such as the euphausiid Stylocheiron longicorne and the fish Cyclothone braueri, or clear diel-migrant behaviour (e.g. the siphonophore Chelophyes appendiculata and the euphausiid Euphausia krohni). Four species, the siphonophore Lensia conoidea, the pteropods...
Tipo: Text
Palavras-chave: Distribution verticale; Macroplancton; Micronecton; Mer Méditerranée; Mer Tyrrhénienne; Vertical distribution; Macroplankton; Micronekton; Mediterranean Sea; Tyrrhenian Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43650/43222.pdf

Peraclis valdiviae from the Banda Sea (Mollusca, Pteropoda)
Provedor de dados: 16
Autores: Spoel, S. van der.
The shell of Peraclis valdiviae (Meisenheimer, 1905) from Banda Sea specimens proved to be of a slender Peraclis bispinosa-like type. The specimens showed a very shallow distribution in the Banda Sea due to relatively high deep-water temperatures and vertical mixing.
Tipo: Article / Letter to the editor
Palavras-chave: Pteropoda; Peraclis valdiviae; Vertical distribution; Banda Sea.
Ano: 1992
URL: http://www.repository.naturalis.nl/record/504469

Larval fish assemblages in nearshore waters of southeast Gulf of California: vertical and temporal patterns
Provedor de dados: 83
Autores: Amezcua,Felipe; Rodríguez-Preciado,José Alberto; Calderón-Pérez,Antonio; Rendón-Rodríguez,Sergio; Green,Lucinda; Chazarreta,Carlo Javier.
Abstract The influence of salinity and temperature on larval fish assemblages, as well as, temporal and vertical patterns on larval fish assemblages off the inlet of the Presidio River, southeast coast of the Gulf of California were evaluated. Samplings for ichthyoplankton and environmental parameter measurements were carried out at three depths, in five sampling sites, during September and December 1994, and April and June 1995. Anchovies and herrings (Clupeiformes) were the most abundant larval fish accounting for 77% of the total abundance. A significant relationship between salinity and the abundance of larval herrings (Opisthonema medirastre and O. dovii) and between the water temperature and the abundance of the weakfish (Cynoscion reticulatus) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuaries; Ichthyoplankton; Larval fish distribution; Sinaloa; Vertical distribution.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100212

十勝地域の未耕地土壌および農耕地土壌におけるリン酸の垂直分布と蓄積量
Provedor de dados: 19
Autores: 谷, 昌幸; 溝田, 千尋; 八木, 哲生; 加藤, 拓; 小池, 正徳; TANI, Masayuki; MIZOTA, Chihiro; YAGl, Tetsuo; KATO, Taku; KOIKE, Masanori.
本研究では，十勝地域の農耕地，とくに普通畑土壌にお ける肥培管理などが土壌へのリン酸蓄積量とその形態に及ぼす影響を明らかにすることを目的とした.畑地およひ隣接する未耕地において土壌断面調査と試料採取を行い，土壌中の全リン酸含量および各種形態別リン酸含量の垂直分布を調べたさらに，仮比重および未耕地と農耕地における土壌の層厚差を考慮し正味のリン酸蓄積量を調べた. 1)淡色黒ボク土，厚層黒ポク土，および普通褐色低地 土のいずれの農耕地土壌においても，施肥などに由来する余剰リン酸は耕起の影響を受けた表層30~40cm までの 作土層に蓄積し，物理的に撹拌および混和されることにより作土層全体に比較的均一に分布した. 2)未耕地土壌との垂直分布の比較から，黒ボク土では 余剰リン酸が下層へ溶脱せず作土層にのみ蓄積し，褐色低地土では一部が下層へ溶脱していると考えられた. 3) 農耕地における正味のリン酸蓄積量は，黒ボク土で 著しく多く，年平均130kgha-1以上であった. 大部分は，フッ化物イオンの配位子交換能により抽出され，活性アルミニウムなどに特異吸着されていると考えられた褐色低地土では蓄積量が少なく，弱酸可溶のリン酸水素カルシウムや，弱い配位子交換反応で抽出可能な非品質リン酸アルミニウムなどの沈殿として蓄積していると考えられた.Heavy application of phosphate fertilizer and subsequent phosphate accumulation in arable soilsï¼ especially Andosolsï¼ are critical issues for sustainable agriculture in ]apan. The effects of...
Palavras-chave: リン酸蓄積; 黒ボク土; 褐色低地土; 層厚差; 垂直分布; Andosols; Brown Lowland soils; Soil thickness; Phosphate accumulation; Vertical distribution.
Ano: 2010
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2696

The autecology of the edible oyster Crassostrea cucullata Born, 1778: size related vertical distribution at Mkomani, Mombasa
Provedor de dados: 20
Autores: Ruwa, R.K.; Okemwa, E.; Polk, P.
The littoral oyster Crassostrea cucullata occurs between 1.05-3.35 m above chart datum with the highest density occuring between 1.85-2.75m. Its distribution is size-related as demonstrated by computation of correlation coefficients (r) and regression equations. The shell lengths (i.e. maximum linear dimension) decreases in an upshore direction. The analysis show high r-values which are significant at P&lt;0.001. The elevation and density related effects on the shell lengths of the oysters are discussed.
Tipo: Journal Contribution
Palavras-chave: Correlation analysis; CRASSOSTREA CUCULLATA; OYSTER REEFS; Oyster culture; Vertical distribution; Oyster culture; Http://aims.fao.org/aos/agrovoc/c_5483.
Ano: 1986
URL: http://hdl.handle.net/1834/1289

Variaciones verticales y su relación con algunos parámetros físico-químicos en una estación fija en el área externa del Golfo de Guayaquil
Provedor de dados: 20
Autores: Chiriguaya, J.; Burgos, L.
Las variaciones hidroquímicas (oxígeno disuelto, nitrato, fosfato y silicato) fueron estudiadas durante 12 horas con intervalos de aproximadamente 3 horas en una estación fija situada frente al Golfo de Guayaquil entre las coordenadas 02° 59' 42 S-81° 40' 92 W. La máxima profundidad en la que se efectuó dicho análisis fue hasta los 50 metros. Se ha detectado una posible relación entre las variaciones verticales (Ondas Internas) y los parámetros físico-químicos, ya que las fluctuaciones de ascensos y descensos fueron observadas en las concentraciones de oxígeno y nutrientes, siendo las ondas internas un factor preponderante en los movimientos verticales de éstos. Estas fluctuaciones también fueron encontradas en el comportamiento de la temperatura,...
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Temperature; Salinity; Vertical distribution; Chemical oceanography; Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1990
URL: http://hdl.handle.net/1834/2179

Vertical and horizontal movements of scalloped hamemerhead shark (Sphyrna lewini) around Malpelo  and Cocos islands (Tropical Eastern Pacific) using satellite telemetry
Provedor de dados: 20
Autores: Bessudo, Sandra; Soler, Germán A.; Klimley, Peter A.; Ketchum, James; Arauz, Randall; Hearn, Alex; Guzmán, Adriana; Calmettes, Beatriz.
Movimientos verticales y horizontales del tiburón martillo (Sphyrna lewini) alrededor de las islas Malpelo y Cocos (Pacífico Oriental Tropical) usando telemetría satelital. El conocimiento de los ámbitos de distribución y los patrones diarios de actividad de peces pelágicos son aspectos clave para el establecimiento y planificación de áreas protegidas para su conservación. En este estudio los movimientos verticales y horizontales de los tiburones martillo, Sphyrna lewini, fueron registrados utilizando telemetría satelital en las islas de Malpelo y Cocos, en el Pacífico Oriental Tropical. Nueve tiburones fueron marcados con transmisores satelitales en marzo de 2006, 2007 y 2008 en la isla Malpelo, y tres tiburones martillo fueron marcados en la isla de...
Tipo: Journal Contribution
Palavras-chave: Vertical distribution; Horizontal distribution; Marine fish; Satellite sensing; Sphyrna lewini.
Ano: 2011
URL: http://hdl.handle.net/1834/4422

Características hidroquímicas de las Bahías Chile, Almirantazgo y Fildes, Islas Shetland del Sur. Verano austral 1990/91
Provedor de dados: 20
Autores: Rodríguez de Moran, A.; Valencia T., M.; Vega, M.
Se presentan las características hidroquímicas de las aguas de las Bahías Chile, Almirantazgo y Fildes, en las Islas del Archipiélago Shetland del Sur, en base a la distribución horizontal y vertical de los parámetros: Oxígeno disuelto, salinidad y micronutrientes inorgánicos (fosfato, nitrito, nitrato y silicato). En forma general, se observa aguas bién oxigenadas, con salinidad relativamente baja, especialmente en la capa superficial, parámetro influenciado por el aporte de aguas de deshielo de los glaciares cercanos. Igualmente alta concentración relativa de micronutrientes inorgánicos, con escasa estratificación de los mismos.
Tipo: Journal Contribution
Palavras-chave: Water analysis; Vertical distribution; Horizontal distribution; Dissolved oxygen; Salinity; Nutrients (mineral); Dissolved oxygen; Water analysis; Salinity.
Ano: 1993
URL: http://hdl.handle.net/1834/3768

Notas hidrológicas de aguas superficiales ecuatorianas según indicadores biológicos-foraminíferos planctónicos
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.
El presente trabajo trata sobre la distribución de los foraminíferos planctónicos vivos en aguas superficiales del mar ecuatoriano, durante los periodos normales y anómalos del océano, ocurridos en determinadas épocas de los años 1971 a 1973 y 1974. El área de muestreo de mayor extensión comprende desde la costa hasta Long. 86°W entre Lat. 01°22'N y Lat. 03°16'S. La distribución de los foraminíferos planctónicos evidencia el desplazamiento de masas de aguas procedentes de la Cuenca de Panamá, Corriente del Perú y zonas de convergencia. Las especies indicadoras de aguas cálidas fueron: Globigerinoides ruber, Bloborotalia mebnardii, Globigerinoides sacculifer y de aguas frías: Globigerina quinqueloba, Globigerinita bradyi, Globigerina bulloides. Durante la...
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Plankton; Indicator species; Vertical distribution; Horizontal distribution; Coastal waters; Environmental conditions; Plankton; Indicator species; Coastal waters; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 1992
URL: http://hdl.handle.net/1834/2313

Dinoflagellate Cysts Records from Core Samples of Modern Marine Sediment at the Luoyuan Bay Mouth.
Provedor de dados: 20
Autores: Sun, Aimei; Li, Chao; Lan, Dongzhao; Zhu, Yue.
Thirty species of dinoflagellate cysts in 15 genus are identified from KMZK5 Core samples of recent marine sediment at the Luoyuan Bay mouth, Fujian. All of these dinoflagellate cysts are first recorded in the Luyuan Bay, 12 species of them are not distributing in the near sea area such as Sansha Bay and Minjiang estuary, including 6 kinds of toxic species, such as Alexandrium affine，A. minutum, A. tamarense, Gonyaulax spinifera, Gymnodinium catenatum and Scrippsiella trochoidea. The abundance and vertical distribution characterestics of the main and the toxic dinoflgellate cysts are also studied in the paper.
Tipo: Journal Contribution
Palavras-chave: Vertical distribution; Toxicity; Dinoflagellates.
Ano: 2007
URL: http://hdl.handle.net/1834/5837

Evaluación hidroacústica del recurso jurel entre la V y X Regiones, año 2003
Provedor de dados: 20
Autores: Córdova, J.; Barbieri, M.A.; Espejo, M.; Núñez, S.; Ortiz, J.; Torres, P.; Bustos, L.; Véjar, F.; Catasti, V.; Valenzuela, V.
El presente informe contiene los resultados de la cuantificación de la biomasa por hidroacústica del jurel (Trachurus murphyi) en la zona centro-sur, la distribución e indicadores biológicos del jurel, las condiciones ambientales y las relaciones entre éstas y la distribución del recurso.
Tipo: Report
Palavras-chave: Biomass; Population number; Echo surveys; Environmental conditions; Vertical distribution; Geographical distribution; Biomass; Geographical distribution; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 2004
URL: http://hdl.handle.net/1834/1731

Distribución de clorofila a en el Estrecho Bransfield (Antártica) durante el verano austral de 1987-1988
Provedor de dados: 20
Autores: Arcos, F.; Córdova, Jorge L.
Se analiza la distribución horizontal y vertical de clorofila a proveniente de 23 estaciones con cuatro niveles de muestreo en el Estrecho Bransfiel durante el verano austral de 1987-1988. Se encontró que heterogeneidad en la distribución y ésta se relaciona con la temperatura superficial así como con los valores de oxígeno disuelto, determinando estrecha relación entre estos parámetros. Los valores elevados de pigmento se restringieron al norte del estrecho, donde la temperatura y oxígeno también fueron relativamente altos. Análisis clorofílico en bahías cerradas reportó también altos valores, siendo el mayor, el encontrado en Bahía Arthur en la Isla Anvers, al sur-oeste de Bransfiel.
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Dissolved oxygen; Surface temperature; Vertical distribution; Horizontal distribution; Antarctic zone; Dissolved oxygen; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1989
URL: http://hdl.handle.net/1834/3830

A drift study of vertical distribution and mortality of Engraulis anchoita eggs and larvae.
Provedor de dados: 20
Autores: Sánchez, R.P.; de Ciechomski, J.D.; Lasta, C.A.; Guerrero, R.A.
Lagrangian changes in distribution and survival within an anchovy egg and larvae patch were studied by means of multiple opening/closing sampling following a free drifting buoy. The buoy was equipped with a radar reflector and flashing light, and it was connected to a current cross drogue floating at 15 m depth, which corresponded to the main egg and larvae concentration within the patch. The drifter was launched on the Buenos Aires continental shelf, off Necochea during the spring spawning peak of 1983. Three discrete depths (within, below and above the thermocline)were repeatedly sampled close to the drogue with a Motoda sampler. Egg and larval abundances in the vicinity of the drogue were monitored at 3/4 hour intervals for a period of three days. Each...
Tipo: Journal Contribution
Palavras-chave: Fish larvae; Fish eggs; Vertical migrations; Feeding; Environmental effects; Ichthyoplankton surveys; Vertical distribution; Survival; Abundance; Drifting data buoys; Fishery surveys; Feeding; Fish larvae; Survival; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_7538.
Ano: 1999
URL: http://hdl.handle.net/1834/1871

Evaluación de la biomasa de adultos desovantes, distribución vertical y variación cuantitativa de la intensidad de los desoves de la anchoíta (Engraulis anchoita) durante la primavera de 1982
Provedor de dados: 20
Autores: de Ciechomski, J.D.; Sánchez, R.P.; Lasta, C.A.
Ichthyoplankton was sampled in 9 exploratory cruises in the sea off Buenos Aires province (Argentina), Uruguay and Brazil, during the spawning peak of the anchovy in spring-early summer and mid-autumn. The most abundant speices in the ichthyoplankton was Engraulis anchoita, representing 88. of the eggs and 76. of the larvae collected in all the cruises. These percentages vary boath regionally and seasonally; as regards eggs, the lowest percentage (10. ) was found in January. The distribution of anchovy eggs and larvae, covered almost entirely the surveyed area, with the exception of hte region influenced by the River Plate estuary. Minimum salinity tolerance for the species eggs was 23.5o/oo. The eastern limit of the distribution of anchovy eggs, extends...
Tipo: Journal Contribution
Palavras-chave: Vertical distribution; Fish eggs; Spawning populations.
Ano: 1986
URL: http://hdl.handle.net/1834/2040

Características hidroquímicas de las Bahías Chile, Almirantazgo y Fildes, Islas Shetland del Sur. Verano austral 1990/91
Provedor de dados: 20
Autores: Valencia T., M.; Rodríguez de Moran, A.; Vega, M.
Se presentan las características hidroquímicas de las aguas de las Bahías Chile, Almirantazgo y Fildes, en las Islas del Archipiélago Shetland del Sur, en base a la distribución horizontal y vertical de los parámetros: Oxígeno disuelto, salinidad y micronutrientes inorgánicos (fosfato, nitrito, nitrato y silicato). En forma general, se observa aguas bién oxigenadas, con salinidad relativamente baja, especialmente en la capa superficial, parámetro influenciado por el aporte de aguas de deshielo de los glaciares cercanos. Igualmente alta concentración relativa de micronutrientes inorgánicos, con escasa estratificación de los mismos.
Tipo: Journal Contribution
Palavras-chave: Water analysis; Vertical distribution; Horizontal distribution; Dissolved oxygen; Salinity; Nutrients (mineral); Dissolved oxygen; Water analysis; Salinity; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1993
URL: http://hdl.handle.net/1834/3768

Distribución de Clorofila-a frente a la costa ecuatoriana durante septiembre y diciembre de 1990
Provedor de dados: 20
Autores: Espinoza, J.; Maridueña, A.M.
Este trabajo describe la distribución tanto superficial como vertical de clorofila-a (Cl-a) durante los meses de septiembre y diciembre de 1990 y se discute la influencia de las condiciones oceanográficas sobre este pigmento fotosintético, como por ejemplo la presencia de una termoclima poco profunda, la posición del Frente Ecuatorial, así como la influencia de la escasez de precipitaciones pluviales sobre el estuario exterior del Golfo de Guayaquil. Todos estos factores favorecieron la presencia de valores estacionales relativamente altos de Cl-a exceptuando los valores bajos de la misma encontrados en el estuario exterior del Golfo de Guayaquil.
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Primary production; Biomass; Horizontal distribution; Vertical distribution; Primary production; Biomass; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1991
URL: http://hdl.handle.net/1834/3107

Observaciones sobre el comportamiento de la merluza (Merluccius hubbsi) durante la pesca de arrastre
Provedor de dados: 20
Autores: Casarsa, L.; Madirolas, A.
The normal behavioral patterns of several fish species is altered during trawling affecting the fish spatial distribution. Sonar methods were carried out in this research work in order to study the reaction of reproductive concentrations of the Argentine hake (Merluccius hubbsi) during mid-water and bottom fishing trawls. Observations made from a trawl sonar mounted on the headrope of an ENGEL (35 m) bottom trawl, showed that this species concentrates at the lower-central sector of the net mouth. During daytime trawls fish schools with a vertical distribution exceeding ten meters were observed entering the trawl within the first two meters from the bottom. Some observations during pelagic trawls carried out at night, showed no specific pattern at the net...
Tipo: Journal Contribution
Palavras-chave: Behaviour; Bottom trawling; Sonar; Echo surveys; Vertical distribution; Behaviour; Http://aims.fao.org/aos/agrovoc/c_868.
Ano: 2007
URL: http://hdl.handle.net/1834/2517

Estudio de la composición específica, abundancia y distribución espacial del microzooplancton (protozoos y micrometazoos) en el estuario del Río de la Plata (Argentina-Uruguay)
Provedor de dados: 20
Autores: Kogan, M.
Species composition, abundance and spatial distribution of microzooplancton (20-200 km)from the Río de la Plata Estuary, Argentina-Uruguay, SW Atlantic (36°S 56°W)were studied from samples collected during two oceanographic cruises at the end of austral spring (in 1999 and 2001)across a gradient from fluvial to coastal waters (200 km). Heterotrophic dinoflagellates, aloricate ciliates, tintinnids, radiolarians, rotifers and copepod nauplii were found. More than 110 taxa were registered, 35 were new records for the area. Three microzooplanktonic assemblages were distinguished using cluster analysis. Species and groups spatial distribution (horizontal and vertical)was related to the distribution of the maxima gradients (salinity, turbidity, etc.), estuarine...
Tipo: Theses and Dissertations
Palavras-chave: Zooplankton; Abundance; Geographical distribution; Salinity stratification; Ecological associations; Brackishwater environment; Community composition; Vertical distribution; Zooplankton; Geographical distribution; Ecological associations; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2005
URL: http://hdl.handle.net/1834/2598

Observaciones sobre la distribución vertical y caracterización de los registros ecoicos de algunas especies de peces costeros en la plataforma bonaerense. November 1994
Provedor de dados: 20
Autores: Madirolas, A.; Castro Machado, F.
Acoustic data were recorded by means of a scientific echosounder, during a survey carried out with R/V Dr. E.L.Holmberg in the coastal region off Buenos Aires, Argentina. Data were obtained in correlation with bottom trawl stations, aiming at characterizing the echo recording of several coastal fish species. Echo recording of the following species could be identified: white croaker Micropogonias furnieri, striped weakfish Cynoscion striatus, horse mackerel Trachurus lathami and red porgy Sparus pagrus. From these, some aspects of fish behaviour are described.In situ target strength measurements were taken with a split-beam transducer for striped weak fish, obtaining mean values of -43.9 dB and -42.9 dB for fish with mean length 17.0 cm and 18.5 cm...
Tipo: Journal Contribution
Palavras-chave: Echo surveys; Marine fish; Echosounding; Vertical distribution; Coastal fisheries; Echosounding; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_16370; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 1998
URL: http://hdl.handle.net/1834/2474

Spatiotemporal dynamics of soil rotifers in a South-Bohemian beech forest
Provedor de dados: 86
Autores: Devetter,Miloslav.
The objective of this work was to determine seasonal variation and vertical distribution of the soil rotifer assemblage in a climax beech forest in South Bohemia. During 2005, soil rotifer was investigated to the species level. Soil samples of 10 cm² and 10 cm in depth were divided into five layers, which were processed separately. Thirty one rotifer species were identified during the investigation. Dominant species significantly changed throughout the seasons. The most abundant species were Encentrum arvicola and Wierzejskiella vagneri among the monogononts, and Adineta steineri, Ceratotrocha cornigera, Habrotrocha filum, Habrotrocha ligula, Macrotrachela plicata, Mniobia tentans, Mniobia incrassata and Mniobia granulosa among the bdelloids. Mean Shannon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bdelloidea; Monogonota; Rotifera; Seasonal dynamics; Vertical distribution.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800035

Composição florística e estrutura do componente epifítico vascular em floresta da planície litorânea na Ilha do Mel, Paraná, Brasil
Provedor de dados: 88
Autores: KERSTEN,RODRIGO DE ANDRADE; SILVA,SANDRO MENEZES.
O estudo das epífitas vasculares foi realizado em uma área de 3.000 m² de floresta na planície litorânea na Ilha do Mel (25°30’ S 48°23’ W); o levantamento qualitativo foi realizado em toda a área; para o estudo quantitativo, foram sorteados 100 forófitos, divididos em intervalos de 2 m a partir do solo. Em cada intervalo, registraram-se todas as espécies epifíticas ocorrentes, sendo estimado o valor de importância epifítico a partir das freqüências nos estratos, nos forófitos e nas espécies forofíticas. No levantamento total, foram encontradas 77 espécies (16 de Pteridophyta, 53 de Liliopsida e 8 de Magnoliopsida), das quais 70 foram amostradas nos forófitos analisados. As famílias mais ricas foram Orchidaceae, Bromeliaceae e Polypodiaceae e os gêneros...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal plain forests; Floristic composition; Vascular epiphytes; Vertical distribution; Restinga.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000200012

Temporal and spatial variations in the structure of macroalgal communities associated with mangrove trees of Ilha do Cardoso, São Paulo state, Brazil
Provedor de dados: 88
Autores: YOKOYA,NAIR S.; PLASTINO,ESTELA M.; BRAGA,MARIA DO ROSÁRIO A.; FUJII,MUTUE T.; CORDEIRO-MARINO,MARILZA; ESTON,VERENA R.; HARARI,JOSEPH.
Temporal and spatial variations in species composition and vertical distribution of macroalgal communities growing on mangrove trees were analyzed bimonthly in the Ilha do Cardoso State Park, São Paulo state (25°03'S and 47°55'W), Southeastern Brazil. The macroalgal communities from mangroves of Perequê and Sítio Grande rivers comprised 10 and 18 taxa respectively. Bostrychia radicans (Mont.) Mont. and B. calliptera (Mont.) Mont. were the predominant taxa, present almost throughout the year and in all the sites studied. The species composition of macroalgal communities from both mangroves presented temporal and spatial variations related to environmental factors. The highest number of taxa was observed during colder, drier months, coinciding with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilha do Cardoso; Mangroves; Macroalgae; Vertical distribution.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000200010

Florística e estrutura do componente epifítico vascular em floresta ombrófila mista aluvial do rio Barigüi, Paraná, Brasil
Provedor de dados: 88
Autores: KERSTEN,RODRIGO A.; SILVA,SANDRO M.
O estudo das epífitas vasculares foi realizado em floresta ombrófila mista aluvial do rio Barigüi, município de Araucária (25º34' S e 49º20' W); o levantamento qualitativo foi realizado em uma área aproximada de 8,6 ha. Para o estudo quantitativo foram sorteados 110 forófitos, divididos em três estratos (fuste baixo, fuste alto e copa). Em cada estrato foram atribuídas notas de abundância para as espécies epifíticas ocorrentes. No levantamento florístico foram encontradas 49 espécies (16 de Pteridophyta, 23 de Liliopsida e 10 de Magnoliopsida), das quais 34 foram observadas na amostragem quantitativa. As famílias e gêneros mais ricos foram: Orchidaceae, Polypodiaceae e Bromeliaceae, e Pleurothallis, Tillandsia e Oncidium. As áreas de maior similaridade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vascular epiphytes; Floristic composition; Vertical distribution; Araucaria forest.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000300002

Biomass and abundance of termites in three remnant areas of Atlantic Forest in northeastern Brazil
Provedor de dados: 92
Autores: Vasconcellos,Alexandre.
Termite biomass and abundance were estimated in three remnant areas of Atlantic Forest in northeastern Brazil: Reserva Biológica de Pedra Talhada-RBPT (Alagoas State), Parque Estadual Dois Irmãos-PEDI (Pernambuco State), and Área de Proteção Ambiental Mata do Buraquinho-APMB (Paraíba State). A quantitative sampling of the termite assemblages present on trunks and leaf litter, in nests, and in the soil was undertaken during the months of June and July (rainy season) and November and December (dry season) of 2000. Thirty seven species of termites were encountered and quantified in the three remnant forest areas. The termite biomass varied from 10.09 to 11.30 g (fresh weight)/m² and abundance varied from 4911 to 5663 individuals/m². The subfamily...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isoptera; Neotropical Region; Nest; Quantitative survey; Vertical distribution.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000300017

The brown lacewings (Neuroptera, Hemerobiidae) of northwestern Turkey with new records, their spatio-temporal distribution and harbouring plants
Provedor de dados: 92
Autores: Kovanci,Orkun Baris; Canbulat,Savas; Kovanci,Bahattin.
The brown lacewings (Neuroptera, Hemerobiidae) of northwestern Turkey with new records, their spatio-temporal distribution and harbouring plants. The occurrence and spatio-temporal distribution of brown lacewing species (Neuroptera, Hemerobiidae) in Bursa province, northwestern Turkey, was investigated during 1999-2011. A total of 852 brown lacewing specimens of 20 species, including the genera of Hemerobius, Megalomus, Micromus, Sympherobius, and Wesmaelius were collected. Of these, 12 species were new records for northwestern Turkey while Sympherobius klapaleki is a new record for the Neuroptera fauna of Turkey. The most widespread species were Hemerobius handschini and Sympherobius pygmaeus with percent dominance values of 42.00 and 15.96%,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bursa; Host plants; Insecta; Phenology; Vertical distribution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262014000200006

Complexo Littorina ziczac (Gmelin) (Mollusca, Gastropoda, Caenogastropoda) no litoral fluminense: análise morfométrica, distribuição vertical e bioquímica
Provedor de dados: 104
Autores: Absalão,Ricardo Silva; Roberg,Renata Alves Pinheiro.
The Littorina ziczac (Gmelin, 1791) species complex was studied in Rio de Janeiro State, southeastern Brazil. The occurrence of three species was confirmed, through the analysis of penis morphology: L. ziczac (Gmelin, 1791), L. lineata d'Orbigny, 1841 and L. lineolata d'Orbigny, 1840. There is a correlation between the morphology of the penis and shell shape, thus it was possible to make a discrimination model based in conchologic data, with an efficiency of 75%. However, this model cannot be applied to others samples that weren't included in its formulation, due to phenotypic plasticity of the shell caused by biotic and abiotic factors. In the 9 areas studied L. lineolata was always the most abundam species. No vertical stratification in the distribution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Littorina; Species complex; Vertical distribution; Biochemistiy; Rio de Janeiro; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000200005

Estimation of soil organic carbon (SOC) at different soil depths and soil use in the Sumapaz paramo, Cundinamarca - Colombia
Provedor de dados: 109
Autores: Montes-Pulido,Carmen Rosa; Ramos-Miras,José Joaquín; San José -Wery,Ana María.
Abstract The vertical distribution of soil organic carbon (SOC), considered to be a key component of the carbon cycle, is still poorly understood in tropical highest mountain ecosystems such as the Andean paramo. The estimation of the SOC in the presence and absence of anthropic intervention, will help to define policies to mitigate CO2 emissions into the atmosphere from this ecosystem. The aim of this research was to determine soil organic carbon sequestration at three soil depths under two types of soil use in the paramo of Sumapaz, Colombia. The soil variations of pH, phosphorus, aluminum, bulk density, carbon sequestration, cation exchange capacity, texture and to estimate the vertical distribution of soil organic carbon SOC, were evaluated,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andisols; Root carbon; Soil organic matter; Vertical distribution.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100095

Floristic composition and spatial distribution of vascular epiphytes in the restingas of Maracanã, Brazil
Provedor de dados: 39
Autores: Quaresma,Adriano Costa; Jardim,Mário Augusto Gonçalves.
Vascular epiphytes constitute a life form that is important to maintaining the biological diversity of forest ecosystems, because they provide food resources and specialized microenvironments for fauna in the forest canopy. This study aimed to describe the floristic composition and ecological aspects of vascular epiphytes occurring in the restingas (coastal woodlands) within the Algodoal-Maiandeua Environmentally Protected Area, located in the municipality of Maracanã, in the state of Pará, Brazil. We sampled five 50 × 50 m plots (three in dry restinga forest and two in floodplain restinga forest), the sampled area therefore totaling 1.25 ha. In the plots sampled, vascular epiphytes were identified and described according to their frequency, abundance,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional group; Amazon coast; Epiphytism; Vertical distribution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100007

Bryophyte flora in upland forests at different successional stages and in the various strata of host trees in northeastern Pará, Brazil
Provedor de dados: 39
Autores: Tavares-Martins,Ana Cláudia Caldeira; Lisboa,Regina Célia Lobato; Costa,Denise Pinheiro da.
In the northeastern region of the Brazilian state of Pará, approximately 90% of the forested areas are secondary forests. Secondary forests are interesting areas for floristic studies aimed at determining the effects that clear-cutting has on bryophyte communities. The aim of this study was to compare upland forests at different successional stages and the various strata of host trees, in terms of the bryophyte species composition. Bryophyte specimens were collected between August 2005 and September 2006 from host trees in primary and secondary forests of different ages and of different heights, within the municipality of Capitão Poço, in the state of Pará. The vertical distribution of bryophytes was evaluated in 15 host trees within the primary forest. We...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophytes; Northeastern Pará; Primary forests; Secondary forests; Vertical distribution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100005

Phytoplankton abundance, dominance and coexistence in an eutrophic reservoir in the state of Pernambuco, Northeast Brazil
Provedor de dados: 42
Autores: Lira,Giulliari A. S. T.; Araújo,Elcida L.; Bittencourt-Oliveira,Maria Do Carmo; Moura,Ariadne N.
The present study reports the phytoplankton abundance, dominance and co-existence relationships in the eutrophic Carpina reservoir, Pernambuco, Brazil. Sampling was carried out at six different depths bimonthly at a single reservoir spanning two climatic periods: dry season (January, September, and November 2006) and rainy season (March, May, and July 2006). Density, abundance, dominance, specific diversity and equitability of the community were determined, along with chlorophyll a, and physical and chemical variables of the environment. Eight species were considered abundant, and their densities corresponded to more than 90% of the total phytoplankton community quantified. Cyanobacteria represented more than 80% of this density. Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carpina reservoir; Cylindrospermopsis raciborskii; Cyanobacteria; Limnological characteristics; Phytoplankton structure; Vertical distribution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400018

Changes in microplanktonic protists assemblages promoted by the thermocline induced stratification around an oceanic archipelago
Provedor de dados: 42
Autores: COSTA,ALEJANDRO E.S.F. DA; SANTANA,JANA R. DE; NEUMANN-LEITÃO,SIGRID.
Abstract In the area around the archipelago of São Pedro e São Paulo (ASPSP), a set of small rocky islands in the Equatorial Atlantic, the thermocline begins at a more superficial depth than in the surrounding waters. This raises the question if there is any change in heterotrophic microplanktonic protists assemblages occurring in the surface mixed layer and in the subsurface layer. To answer this question, we sampled seawater in seven depths (between 1-100 m) with a 10L Niskin bottle and obtained temperature and salinity profiles with a CTD at eight sites around the ASPSP. The depth of the surface mixed layer varied between 18-63 meters. Dinoflagellates dominated in terms of abundance representing over 80% and 65% of the individuals found in the surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinoflagellates; Ecological indicators; Polycystine radiolarians; Tintinnid ciliates; Tropical oceans; Vertical distribution.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502249

Arbuscular mycorrhizal fungi in saline soils: vertical distribution at different soil depth
Provedor de dados: 58
Autores: Becerra,Alejandra; Bartoloni,Norberto; Cofré,Noelia; Soteras,Florencia; Cabello,Marta.
Arbuscular mycorrhizal fungi (AMF) colonize land plants in every ecosystem, even extreme conditions such as saline soils. In the present work we report for the first time the mycorrhizal status and the vertical fungal distribution of AMF spores present in the rhizospheric soil samples of four species of Chenopodiaceae (Allenrolfea patagonica, Atriplex argentina, Heterostachys ritteriana and Suaeda divaricata) at five different depths in two saline of central Argentina. Roots showed medium, low or no colonization (0-50%). Nineteen morphologically distinctive AMF species were recovered. The number of AMF spores ranged between 3 and 1162 per 100 g dry soil, and AMF spore number decreased as depth increased at both sites. The highest spore number was recorded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arbuscular mycorrhiza; Saline environments; Soil profile; Vertical distribution; Mycorrhizal status.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000200029