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| Registros recuperados: 42 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 42 | |
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