Consulta: subjectFacets:"Ponds"
Registros recuperados: 9
Data/hora: 12/06/2024 12:33:53

Can nesting waterbirds influence the community structure of macroinvertebrates in southern Brazilian intermittent wetlands?
Provedor de dados: Iheringia Série Zoologia
Autores: Zardo,Daniela C.; Souza,Marcela M.; Pires,Mateus M.; Stenert,Cristina; Maltchik,Leonardo.
ABSTRACT The main goal of this study was to test the effect of the presence of nesting waterbirds on the taxonomic structure (richness, abundance and composition) of macroinvertebrate communities in southern Brazilian wetlands. Macroinvertebrate communities were seasonally sampled in eight intermittent wetlands differing according to the occurrence of nesting colonies of waterbirds (four with the presence of rookeries; four without). The influence of nutrients and water and sediment physicochemical variables on macroinvertebrate communities was also assessed. The community structure of aquatic macroinvertebrates was not affected by the presence of colonies of nesting waterbirds. Rather, macroinvertebrate communities varied seasonally and they were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Ponds; Waterfowl; Water chemistry.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100219

Donnees sur les gasteropodes dulcicoles de l'ouest de la France: Mise en evidence de cinq groupes d'especes (ACP)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Estudios limnológicos en lagos y lagunas del Parque Nacional Torres del Paine (51°S, Chile)
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: 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

A null model for explain crustacean zooplankton species associations in central and southern patagonian in land waters
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: 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

Construction of earthen ponds
Provedor de dados: Ocean Docs: e-repository of  publications
Tipo: Book
Palavras-chave: Aquaculture; Ponds.
Ano: 2009
URL: http://hdl.handle.net/1834/5330

Etude taxonomique de trois espèces de Coléoptères inventoriés dans des étangs piscicoles au sud de la Côte d'Ivoire.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: 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

Inventory of water storage types in the Blue Nile and Volta River Basins
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: 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

Performance and economic indicators of a large scale fish farming in Mato Grosso, Brazil
Provedor de dados: Revista Brasileira de Zootecnia
Autores: 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

Amorphous silica biomineralizations in Schoenoplectus californicus (Cyperaceae): their relation with maturation stage and silica availability
Provedor de dados: Boletín de la Sociedad Argentina de Botánica
Autores: 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