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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 9
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A null model for explain crustacean zooplankton species associations in central and southern patagonian in land waters OceanDocs
De los Rios, Patricio.
Los ensambles zooplanctónicos en cuerpos de agua de la zona centro y sur de la Patagonia chilena se caracterizan por su alto endemismo y un relativo bajo número de especies lo cual se debería principalmente a la oligotrofía y niveles de conductividad de estos ambientes. El objetivo del presente trabajo consistió en analizar información publicada y sin publicar sobre crustáceos zooplanctónicos en lagos y lagunas de la zona central y sur de la Patagonia (44 - 53g S). A estos datos se les estimó la razón especies / género, y se aplicó un modelo nulo basado en co-ocurrencia de especies mediante una matriz de presencia y ausencia de especies, con la intención de determinar ausencia de factores reguladores de las asociaciones de especies. Dentro de este mismo...
Tipo: Journal Contribution Palavras-chave: Zooplankton; Assemblages; Lakes; Ponds; Crustaceans.
Ano: 2008 URL: http://hdl.handle.net/1834/4161
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Amorphous silica biomineralizations in Schoenoplectus californicus (Cyperaceae): their relation with maturation stage and silica availability Boletín de la Sociedad
Fernández Honaine,Mariana; Borrelli,Natalia L; Osterrieth,Margarita; Del Rio,Luis.
The factors involved on the silicifcation process in Cyperaceae are scarcely known. In this study we analyse the effect of maturation stage and silica availability on the production of amorphous silica biomineralizations in culms of Schoenoplectus californicus. Young and senescent culms were collected from ponds with different silica availability. Two complementary methodologies (calcination and staining techniques), light and scanning electron microscopy and EDS were applied for amorphous silica analyses in plants. Quantitative data were analysed by Kruskal-Wallis and a two-way ANOVA tests. There were no signifcant differences between silica content of culms collected in ponds with different silica availability. Instead, silica content in senescent culms...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sedge; Silicophytoliths; Senescence; Aerenchyma; Culms; Ponds; SE Buenos Aires province.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722013000200006
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Construction of earthen ponds OceanDocs
Tipo: Book Palavras-chave: Aquaculture; Ponds.
Ano: 2009 URL: http://hdl.handle.net/1834/5330
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Donnees sur les gasteropodes dulcicoles de l'ouest de la France: Mise en evidence de cinq groupes d'especes (ACP) ArchiMer
Costil, F.
24 Species of Gastropoda, representing 3357 specimens, have been sampled in 57 varied ponds of Brittany (France). The most frequent species (at least in 10% of the samples) are considered according to their average abundance and dominance. The average specific richness of the ponds where the species have been collected is studied. In a second stage, the Gastropoda are analysed by means of a principal component analysis. The 1-2 plane correspond to 87% of the whole variance. This analysis associated with a cluster analysis led to the partition of 5 groups of species.
Tipo: Text Palavras-chave: Gastropoda; Frequency analysis; Freshwater molluscs; Fresh water; Check lists; Inventories; Mathematical models; Ponds; Abundance.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1713.pdf
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Estudios limnológicos en lagos y lagunas del Parque Nacional Torres del Paine (51°S, Chile) OceanDocs
Soto, Doris; De los Ríos, Patricio.
La Patagonia de Chile posee muchos ecosistemas acuáticos sin contaminación, dentro de estos ecosistemas hay muchos lagos y lagunas prístinos. En este estudio, se analizó información colectada entre los años 1989 y 1990 (sin publicar y sin publicar) sobre lagos y lagunas del Parque Nacional Torres del Paine, un área sin contaminar en el sur de Chile (51° S). Se aplicó un análisis de componentes principales considerando parámetros químicos, riqueza de especies zooplanctónicas y biomasa. Los resultados denotaron que las concentraciones de cationes (Ca, Na y Mg), cloruros, seston y clorofila, junto con biomasa de zooplancton y riqueza de especies zooplanctónicas fueron las principales variables que contribuyeron al modelo obtenido. Según este modelo, se...
Tipo: Journal Contribution Palavras-chave: Lakes; Ponds; Chlorophylls; Zooplankton; Nutrients; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2009 URL: http://hdl.handle.net/1834/4167
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Etude taxonomique de trois espèces de Coléoptères inventoriés dans des étangs piscicoles au sud de la Côte d'Ivoire. OceanDocs
Yapo, M.L.; Atsé, B.C..
L'étude taxonomique de trois taxons appartenant aux genres Bagous, Pseudobagous et Macroplea récoltés dans les étangs de cinq fermes piscicoles au sud de la Côte d'Ivoire a permis d'identifier trois nouvelles espèces pour la Côte d'Ivoire. Ceci constitue une contribution à la liste des Coléoptères aquatiques pour la communauté scientifique.
Tipo: Journal Contribution Palavras-chave: Aquatic insects; Ponds.
Ano: 2010 URL: http://hdl.handle.net/1834/5778
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Inventory of water storage types in the Blue Nile and Volta River Basins AgEcon
Johnston, Robyn M.; McCartney, Matthew P..
For agriculture there is a continuum of water storage options, ranging from groundwater aquifers, soil water, natural wetlands and small ponds and tanks to large reservoirs. In any situation each of these has its own niche in terms of technical feasibility, socioeconomic sustainability and impact on public health and the environment. Planning storage requires insight into impending needs and also a good understanding of what already exists and what was, and was not, successful, in the past. This report provides an inventory of existing and prospective water storage in the Ghanaian Volta and the Ethiopian Blue Nile basins. It provides as much quantitative data as possible, but highlights both the dearth of readily available information and the lack of...
Tipo: Working or Discussion Paper Palavras-chave: Water storage; River basins; Reservoirs; Ponds; Tanks; Groundwater; Soil moisture; Wetlands; Environmental Economics and Policy; Farm Management.
Ano: 2010 URL: http://purl.umn.edu/113608
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Pedogenesis in a semi-arid wetland. Repositório Alice
SÁ, E. S. dos S. C. G. de; SOUZA JÚNIOR, V. S. de; SILVA, A. H. N. da; SOUSA, J. E. S. de; ARAUJO FILHO, J. C. de.
The purpose of this work is to identify the pedogenetic processes and to classify chemically, physically and morphologically the soils.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Lagoa; Ponds; Wetlands; Semiarid zones.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115323
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Performance and economic indicators of a large scale fish farming in Mato Grosso, Brazil R. Bras. Zootec.
Barros,Adriana Fernandes de; Martins,Maria Inez Espagnoli Geraldo.
Performance and economic indicators of a large scale fish farm that produces round fish, located in Mato Grosso State, Brazil, were evaluated. The 130.8 ha-water surface area was distributed in 30 ponds. Average total production costs and the following economic indicators were calculated: gross income (GI), gross margin (GM), gross margin index (GMI), profitability index (PI) and profit (P) for the farm as a whole and for ten ponds individually. Production performance indicators were also obtained, such as: production cycle (PC), apparent feed conversion (FC), average biomass storage (ABS), survival index (SI) and final average weight (FAW). The average costs to produce an average 2.971 kg.ha-1 per year were: R$ 2.43, R$ 0.72 and R$ 3.15 as average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Costs; Income; Ponds; Profitability; Round fish.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600001
Registros recuperados: 9
Primeira ... 1 ... Última
 

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