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| Registros recuperados: 18 | |
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| 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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| Vaz,Sérgio Renato; Lenzi,Ervim; Luchese,Eduardo Bernardi; Fávero,Luzia O. B.. |
| Este trabalho analisa a dinâmica do chumbo no lago do parque do Ingá, Maringá - PR. Mensalmente durante um ano foram coletadas amostras de água e sedimentos e o pH e temperatura medidos no ato da coleta. Nas amostras de água foi determinada a Demanda Química de Oxigênio (DQO) e a concentração total de Pb na água e sedimentos. A determinação da concentração Pb na água e sedimentos foi feita com a técnica da espectrometria da absorção atômica, modalidade chama. Os valores médios mensais encontrados, em intervalos e médias globais foram respectivamente: concentração de Pb na água, em ng.mL-1, não detectado (nd) - 55,56 e 19,23; Pb em sedimentos, em µg.g-1, 48,73 - 92,87 e 71,93; pH, 7,02 - 8,23 e 7,60; temperatura, em °C, 19,33 - 27,48 e 23,73; DQO, em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lead; Lakes; Environmental pollution; Elements environmental dynamic; Environment. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000400010 |
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| Adams, Damian C.; Lee, Donna J.. |
| We present a bioeconomic model of three invasive aquatic plants (hydrilla, water hyacinth, and water lettuce) in 13 large Florida lakes, and simulate one-year and steady-state impacts of three control scenarios. We estimate that the steady-state annual net benefit of invasive plant control is $59.95 million. A one-year increase in control yields steady-state gains of $6.55 million per year, and a one-year lapse causes steady-state annual losses of $18.71 million. This model shows that increased control of hydrilla, water hyacinth, and water lettuce is optimal. |
| Tipo: Journal Article |
Palavras-chave: Aquatic plants; Bioeconomics; Invasive species; Lakes; Maintenance control; Q57; Q26; Q28; Q51; Q25. |
| Ano: 2007 |
URL: http://purl.umn.edu/37139 |
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| 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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| Lopes,Ruy Bessa; Landell Filho,Luiz de Carvalho; Dias,Carlos Tadeu dos Santos. |
| Fee-fishing operations developed recently in Brazilian agricultural scenery in a rather disordered manner. This study, carried out at the northwest region of São Paulo State, Brazil, focuses on the productive performance of fee-fishing system. Several visits were made monthly to nine fee-fishing establishments, for six months. A questionnaire by owners targeting 13 indicators of the operation's productive performance. Data were submitted to multivariate analysis (MANOVA), principal component analysis (PCA) and cluster analysis. MANOVA indicated significant differences between the fee-fishing operations. The PCA analyses indicated, from the higher coefficient eigenvectors, three attributes for the lakes, such as productive system, fishery management and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Multivariate analyses; Productive system; Lakes. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600013 |
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| OYANEDEL,J. PABLO; VEGA-RETTER,CAREN; SCOTT,SERGIO; HINOJOSA,LUIS FELIPE; RAMOS-JILIBERTO,RODRIGO. |
| During the last decades, limnological studies on Chilean systems have contributed to know the species composition and main environmental variables of many water bodies distributed over a wide latitudinal interval, from 18º to 53º S. However, we still lack of a comprehensive view about the structure and functioning of regional freshwaters. In this work we review the available information about pelagic biota from Chilean basins, in order to reveal patterns of species distribution and their possible association with environmental variables. We built presence-absence matrices for phytoplankton, zooplankton and fish over lakes and basins. From this database, we performed parsimony analysis of endemicity as a tool for determining fundamental distribution... |
| Tipo: Journal article |
Palavras-chave: Limnology; Lakes; Plankton; Biogeography; Chile; CCA. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200004 |
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| LIMA NETO,IRAN E.. |
| Abstract: Field surveys and integral modelling were carried out to study the effect of bubble plumes on the flow hydrodynamics and the time-evolution of water temperature profiles in a shallow lake with maximum depth of about 4 m. Then, model simulations were performed to verify the feasibility of destratification of ten water-supply reservoirs with capacities of 10-2,000 hm3. Finally, hydrological modelling was conducted to assess the impact of destratification on evaporation suppression and its effects on reservoir yield. The results indicate that net temperature reductions of the order of 1.0°C can be obtained, which corresponds to evaporation suppressions of approximately 10%. In turn, this resulted in increases in the regulated flow of 2-12% that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeration; Evaporation; Bubble plumes; Lakes; Stratification; Water yield. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500904 |
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| SILVA,MARCIO S. DA; GUIMARÃES,JOSÉ T.F.; SOUZA FILHO,PEDRO W.M.; NASCIMENTO JÚNIOR,WILSON; SAHOO,PRAFULLA K.; COSTA,FRANCISCO R. DA; SILVA JÚNIOR,RENATO O.; RODRIGUES,TARCÍSIO M.; COSTA,MARLENE F. DA. |
| ABSTRACT High-resolution satellite images, digital elevation models, bathymetric and sedimentological surveys coupled with statistical analysis were used to understand the physical environment and discuss their influence on water quality of the five upland lakes of Serra Sul dos Carajás, southeast Amazonia. The lakes have mid-altitude ranges (elevation), very small (catchment) and shallow to very shallow (central basins). Based on the length, area and volume, Violão and TI (Três Irmãs)-3 lakes may present large vertical movements of the water due to wind action and weakly stratified waters. Trophic conditions based on depth and shore development (Ld) parameters must be used with caution, since Amendoim Lake is relatively deep, but it is oligotrophic to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lateritic crust; Lakes; Limnology; Geomorphology; Amazon region; Carajás. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401309 |
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| Carpenter, Stephen R; Center for Limnology, University of Wisconsin-Madison; srcarpen@wisc.edu; Booth, Eric G.; Department of Agronomy, University of Wisconsin-Madison; Department of Civil and Environmental Engineering, University of Wisconsin-Madison; egbooth@wisc.edu; Gillon, Sean; Department of Food Systems and Society, Marylhurst University; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; sgillon@marylhurst.edu; Kucharik, Christopher J.; Department of Agronomy, University of Wisconsin-Madison; Nelson Institute Center for Sustainability and the Global Environment, University of Wisconsin-Madison; kucharik@wisc.edu; Loheide, Steven; Department of Civil and Environmental Engineering, University of Wisconsin-Madison; Loheide@wisc.edu; Mase, Amber S.; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; Mase@wisc.edu; Motew, Melissa; Nelson Center for Sustainability and the Global Environment, University of Wisconsin-Madison; Motew@wisc.edu; Qiu, Jiangxiao; Department of Zoology, University of Wisconsin-Madison; jqiu7@wisc.edu; Rissman, Adena R; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; ARRissman@wisc.edu; Seifert, Jenny; Center for Limnology, University of Wisconsin-Madison; JSeifert2@wisc.edu; Soylu, Evren; Department of Civil Engineering, Meliksah University; Nelson Institute for Sustainability and the Global Environment, University of Wisconsin-Madison; evrensoylu@gmail.com; Turner, Monica; Department of Zoology, University of Wisconsin-Madison; turnermg @ wisc.edu; Wardropper, Chloe B; Nelson Institute for Environmental Studies, University of Wisconsin-Madison; Wardropper@wisc.edu. |
| Agricultural watersheds are affected by changes in climate, land use, agricultural practices, and human demand for energy, food, and water resources. In this context, we analyzed the agricultural, urbanizing Yahara watershed (size: 1345 km², population: 372,000) to assess its responses to multiple changing drivers. We measured recent trends in land use/cover and water quality of the watershed, spatial patterns of 10 ecosystem services, and spatial patterns and nestedness of governance. We developed scenarios for the future of the Yahara watershed by integrating trends and events from the global scenarios literature, perspectives of stakeholders, and models of biophysical drivers and ecosystem services. Four qualitative scenarios were created to... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Alternative futures; Climate; Ecosystem services; Eutrophication; Governance; Lakes; Land-use change; Phosphorus; Scenarios. |
| Ano: 2015 |
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| Gichuki, J.; Maithya, J.; Masai, D. M.. |
| Studies on the ecology of Lake Sare (Kenya) were carried out to provide baseline information on the ecological conditions before a major wetland reclamation project was started upstream of the lake. Results indicated that maximum depth had decreased by 0.9 m while Secchi depth readings had decreased by 0.1 m compared to historical values. This implies that the lake was undergoing siltation. pH values had increased from 6.80 to 7.58 reflecting increased primary production. Conductivity had increased from 106 – 137 2 ~kS/cm. NO3- N and PO4-P had significantly increased from 0.8~kg N l-1 and 0.14 ~kg P l-1 to 23.90.8~kg N l-1 and 34.80.8~kg P l-1 respectively while chlorophyll a values reached 34.8 ~kgl-1. The macrophyte environment was dominated by Cyperus... |
| Tipo: Proceedings Paper |
Palavras-chave: Aquatic ecology; Wetlands; Lakes. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4298 |
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| Angeler, David G; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment; david.angeler@slu.se; Drakare, Stina; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; stina.drakare@slu.se; Johnson, Richard K; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; richard.johnson@slu.se. |
| Revealing the adaptive responses of ecological, social, and economic systems to a transforming biosphere is crucial for understanding system resilience and preventing collapse. However, testing the theory that underpins complex adaptive system organization (e.g., panarchy theory) is challenging. We used multivariate time series modeling to identify scale-specific system organization and, by extension, apparent resilience mechanisms. We used a 20-year time series of invertebrates and phytoplankton from 26 Swedish lakes to test the proposition that a few key-structuring environmental variables at specific scales create discontinuities in community dynamics. Cross-scale structure was manifested in two independent species groups within both communities across... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Complex adaptive systems dynamics; Complex adaptive systems organization; Cross-scale structure; Discontinuities; Environmental variables; Invertebrates; Lakes; Panarchy; Phytoplankton; Resilience; Time series modeling. |
| Ano: 2011 |
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| Tedesco,Carla D; Petry,Claudia; Bortoluzzi,Edson C; Castamann,Alfredo. |
| ABSTRACT White Star (Nymphoides humboldtiana), an aquatic-environmental native species of Brazilian flora, was selected in order to be used as ornamental plant in lakes. White Star plants were submitted to two water levels (high water level, up to 30 cm water depth and, low water level until substrate saturation) and two light intensities (full sun and 50% shading) to evaluate vegetative and flowering development. The experimental design was completely randomized, in a subplot scheme, being the water level the main plot and luminosity the subplot. Seven replicates were performed, and the sample unit consisted of one plant. Data related to number of leaves and flowers, length and diameter of petioles and leaf area were submitted to analyze of variance and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lakes; Landscaping; Cultivation environment; Ornamental. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000200133 |
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| Gunderson, Lance H; Emory University; lgunder@emory.edu; Carpenter, Steve R; University of Wisconsin; srcarpen@facstaff.wisc.edu; Folke, Carl; Stockholm University; calle@system.ecology.su.se; Olsson, Per; Centre for Transdiciplinary Environmental Research; per@ctm.su.se; Peterson, Garry; McGill University; garry.peterson@mcgill.ca. |
| The lakes in the northern highlands of Wisconsin, USA, the lakes and wetlands of Kristianstads Vattenrike in southern Sweden, and the Everglades of Florida, USA, provide cases that can be used to compare the linkages between ecological resilience and social dynamics. The erosion of ecological resilience in aquatic and wetland ecosystems is often a result of past management actions and is manifest as a real or perceived ecological crisis. Learning is a key ingredient in response to the loss of ecological resilience. Learning is facilitated through networks that operate in distinct arenas and are structured for dialogue, synthesis, and imaginative solutions to chart alternative futures. The networks also help counter maladaptive processes such as information... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Resilience management social networks learning; Wetlands; Lakes; Wisconsin; Everglades; Florida; Sweden. |
| Ano: 2006 |
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| Registros recuperados: 18 | |
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