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| Registros recuperados: 127 | |
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| Paredes Santaella, Andrés. |
| Se realizaron dos modelos, uno hidrológico y uno dinámico, para simular el comportamiento de la poza La Becerra, en el valle de Cuatro Ciénegas, Coahuila, para identificar el efecto de las extracciones de agua para el riego en la hidrología del humedal El Garabatal. Los modelos se basan en un balance hídrico, el cual está definido por la aplicación del principio de conservación de masas, también conocido como ecuación de la continuidad. Esta establece que, para cualquier volumen arbitrario y durante cualquier período de tiempo, la diferencia entre las entradas y salidas estará condicionada por la variación del volumen de agua almacenada (Sokolov A., 1981). Estos modelos hacen un balance de los volúmenes derramados, el déficit, los volúmenes evaporados, las... |
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Palavras-chave: Modelo; Humedales; Balance; Model; Wetland; Maestría; Hidrociencias. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/484 |
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| Paredes Santaella, Andrés. |
| Se realizaron dos modelos, uno hidrológico y uno dinámico, para simular el comportamiento de la poza La Becerra, en el valle de Cuatro Ciénegas, Coahuila, para identificar el efecto de las extracciones de agua para el riego en la hidrología del humedal El Garabatal. Los modelos se basan en un balance hídrico, el cual está definido por la aplicación del principio de conservación de masas, también conocido como ecuación de la continuidad. Esta establece que, para cualquier volumen arbitrario y durante cualquier período de tiempo, la diferencia entre las entradas y salidas estará condicionada por la variación del volumen de agua almacenada (Sokolov A., 1981). Estos modelos hacen un balance de los volúmenes derramados, el déficit, los volúmenes evaporados, las... |
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Palavras-chave: Modelo; Humedales; Balance; Model; Wetland; Maestría; Hidrociencias. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/484 |
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| Downing, Andrea S.; Stockholm Resilience Centre, Stockholm University, Sweden; Aquatic Ecology and Water Quality Management group, Wageningen University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands ; andrea.downing@su.se; van Nes, Egbert H.; Aquatic Ecology and Water Quality Management group, Wageningen University, Netherlands ; Egbert.vannes@wur.nl; Balirwa, John S.; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; jbalirwa@yahoo.com; Beuving, Joost; Department of Cultural Anthropology and Development Studies, Faculty of Social Sciences, Radboud University, Nijmegen, Netherlands ; joostbeuving@gmail.com; Bwathondi, P.O.J.; University of Dar es Salaam, College of Natural and Applied Sciences, Department of Aquatic Sciences and Fisheries, Dar es Salaam, Tanzania ; bwathondi@yahoo.co.uk; Chapman, Lauren J.; Department of Biology, McGill University, Montreal, Canada; lauren.chapman@mcgill.ca; Cornelissen, Ilse J. M.; Aquaculture & Fisheries Group, Wageningen University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; ilsecornelissen@hotmail.com; Cowx, Iain G.; Hull International Fisheries Institute, University of Hull, United Kingdom; I.G.Cowx@hull.ac.uk; Goudswaard, Kees P. C.; Institute for Marine Resource and Ecosystem Studies (IMARES), Wageningen University, Yerseke, Netherlands; kees.goudswaard@wur.nl; Hecky, Robert E.; Biology Department and Large Lakes Observatory, University of Minnesota-Duluth, USA; rehecky@gmail.com; Janse, Jan H.; Netherlands Environmental Assessment Agency (PBL), Bilthoven, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; JH.Janse@rivm.nl; Janssen, Annette B. G.; Aquatic Ecology and Water Quality Management group, Wageningen University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; A.Janssen@nioo.knaw.nl; Kaufman, Les; Boston University Marine Program, Biology Department, Boston University, USA ; lesk@bu.edu; Kishe-Machumu, Mary A.; Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania; mkishe@yahoo.com; Kolding, Jeppe; Department of Biology, University of Bergen, Norway; jeppe.kolding@bio.uib.no; Ligtvoet, Willem; Netherlands Environmental Assessment Agency (PBL), The Hague, Netherlands; Willem.Ligtvoet@pbl.nl; Mbabazi, Dismas; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; mbabazidismas@yahoo.com; Medard, Modesta; Department of Sociology of Development and Change. Social Science Group, Wageningen University, Netherlands ; modesta.medard@wur.nl; Mkumbo, Oliva C.; Lake Victoria Fisheries Organisation, Jinja, Uganda; ocmkumbo@lvfo.org; Mlaponi, Enock; Tanzania Fisheries Research Institute (TAFIRI), Mwanza, Tanzania; emlaponi@yahoo.com; Munyaho, Antony T.; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; ataabum@yahoo.com; Nagelkerke, Leopold A. J.; Aquaculture & Fisheries Group, Wageningen University, Netherlands; leo.nagelkerke@wur.nl; Ogutu-Ohwayo, Richard; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; ogutuohwayo@yahoo.com; Ojwang, William O.; Kenya Marine and Fisheries Research Institute (KMFRI), Kisumu, Kenya; w_ojwang@yahoo.com; Peter, Happy K.; Aquaculture & Fisheries Group, Wageningen University, Netherlands; Happy.Peter@wur.nl; Schindler, Daniel E.; Aquatic & Fishery Sciences/Department of Biology, University of Washington, USA; deschind@uw.edu; Seehausen, Ole; Eawag, Kastanienbaum, Switzerland; Ole.Seehausen@eawag.ch; Sharpe, Diana; Smithsonian Tropical Research Institute, Panama City, Panama; Department of Biology, McGill University, Montreal, Canada; diana.sharpe@gmail.com; Silsbe, Greg M.; Royal Netherlands Institute for Sea Research, Yerseke, Netherlands; Greg.Silsbe@nioz.nl; Sitoki, Lewis; The Technical University of Kenya, Nairobi, Kenya; Sitoki@hotmail.com; Tumwebaze, Rhoda; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; t60rhoda@gmail.com; Tweddle, Denis; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa; D.Tweddle@saiab.ac.za; van de Wolfshaar, Karen E.; Institute for Marine Resource and Ecosystem Studies (IMARES), Wageningen University, Ijmuiden, Netherlands; karen.vandewolfshaar@wur.nl; van Dijk, Han; Department of Sociology of Development and Change. Social Science Group, Wageningen University, Netherlands ; han.vandijk@wur.nl; van Donk, Ellen; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; E.vandonk@nioo.knaw.nl; van Rijssel, Jacco C.; Institute of Biology, University of Leiden, Netherlands; Naturalis Biodiversity Center, Leiden, Netherlands; Eawag, Kastanienbaum, Switzerland; j.c.van.rijssel@biology.leidenuniv.nl; van Zwieten, Paul A. M.; Aquaculture & Fisheries Group, Wageningen University, Netherlands; paul.vanzwieten@wur.nl; Wanink, Jan; Institute of Biology, University of Leiden, Netherlands; Koeman en Bijkerk bv, Ecological Research and Consultancy, Haren, Netherlands; j.h.wanink@koemanenbijkerk.nl; Witte, F.; Institute of Biology, University of Leiden, Netherlands; Naturalis Biodiversity Center, Leiden, Netherlands;; Mooij, Wolf M.; Aquatic Ecology and Water Quality Management group, Wageningen University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands ; w.mooij@nioo.knaw.nl. |
| East Africa’s Lake Victoria provides resources and services to millions of people on the lake’s shores and abroad. In particular, the lake’s fisheries are an important source of protein, employment, and international economic connections for the whole region. Nonetheless, stock dynamics are poorly understood and currently unpredictable. Furthermore, fishery dynamics are intricately connected to other supporting services of the lake as well as to lakeshore societies and economies. Much research has been carried out piecemeal on different aspects of Lake Victoria’s system; e.g., societies, biodiversity, fisheries, and eutrophication. However, to disentangle drivers and dynamics of change in this complex system, we need... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Eutrophication; Feedbacks; Fisheries; Lake Victoria; Model; Multidisciplinary social-ecological system; Sustainability. |
| Ano: 2014 |
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| Conroy, Michael J; USGS Cooperative Fish and Wildlife Research Unit; conroy@forestry.uga.edu; Allen, Craig; University of Nebraska; allencr@unl.edu; Peterson, James T; USGS Cooperative Fish and Wildlife Research Unit;; Pritchard, Lowell, Jr.; Emory University; lpritc2@emory.edu; Moore, Clinton T; ;. |
| The southern Piedmont of the southeastern United States epitomizes the complex and seemingly intractable problems and hard decisions that result from uncontrolled urban and suburban sprawl. Here we consider three recurrent themes in complicated problems involving complex systems: (1) scale dependencies and cross-scale, often nonlinear relationships; (2) resilience, in particular the potential for complex systems to move to alternate stable states with decreased ecological and/or economic value; and (3) uncertainty in the ability to understand and predict outcomes, perhaps particularly those that occur as a result of human impacts. We consider these issues in the context of landscape-level decision making, using as an example water resources and lotic... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Piedmont; Adaptive management; Land use; Model; Resilience; Scale; Sprawl; Uncertainty; Urbanization; Water resources. |
| Ano: 2003 |
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| Scheffer, Marten; Wageningen Agricultural University; Marten.Scheffer@wur.nl. |
| Despite the huge scientific progress of the last century, the dynamics of complex systems such as the atmosphere, human societies, and ecosystems remain difficult to understand and predict. Nonetheless, our ability to carve the future depends largely on our insight into the functioning of such complex systems. Complex systems are the focus of considerable mathematical theory. Rather than referring to any particular part of the world, such theory addresses what seems to be another world: a world of strange attractors, catastrophe folds, torus destruction, and homoclinic bifurcations. So disparate is the language and notation in this discipline that it is hard to imagine that it has any thing to do with reality as we know it. Indeed, it deals with a kind of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Bifurcation; Catastrophe; Chaos; Cycle; Daphnia; Fish; Macrophyte; Model; Multiple stable states; Plankton; Predation; Trophic cascade. |
| Ano: 1999 |
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| Casagrandi, Renato; Dipartimento di Elettronica e Informazione, Politecnico di Milano; casagran@elet.polimi.it; Rinaldi, Sergio; CIRITA, Politecnico di Milano; rinaldi@elet.polimi.it. |
| This paper shows that it is difficult, if not impossible, to formulate policies that guarantee that tourism can be maintained for a long time without severely impacting on the environment. The analysis is purely theoretical and is based on very simple and general assumptions about the interactions between the three main components of the system: the tourists, the environment, and the capital. These assumptions are encapsulated in a so-called minimal model, used to predict the economic and environmental impact of any given policy. This paper is of value for three reasons. First, it introduces the approach of minimal descriptive models in the context of tourism, which has traditionally been dominated by the use of black-box econometric models. Second, the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Bifurcation analysis; Environment; Model; Nonlinear dynamics; Sustainability; Tourism. |
| Ano: 2002 |
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| Loisy, Fabienne; Atmar, R; Le Saux, Jean-claude; Cohen, J; Caprais, Marie-paule; Pommepuy, Monique; Le Guyader, Soizick. |
| Rotavirus virus-like particles (VLPs) and MS2 bacteriophages were bioaccumulated in bivalve mollusks to evaluate viral persistence in shellfish during depuration and relaying under natural conditions. Using this nonpathogenic surrogate virus, we were able to demonstrate that about 1 log(10) of VLPs was depurated after 1 week in warm seawater (22 degrees C). Phage MS2 was depurated more rapidly (about 2 log(10) in 1 week) than were VLPs, as determined using a single-compartment model and linear regression analysis. After being relayed in the estuary under the influence of the tides, VLPs were detected in oysters for up to 82 days following seeding with high levels of VLPs (concentration range between 10(10) and 10(9) particles per g of pancreatic tissue)... |
| Tipo: Text |
Palavras-chave: Seawater; Viral diseases; Bioaccumulation; Depuration; Contamination; Model; Pancreas; Regression analysis; Shellfish; Phages; Virus. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1233.pdf |
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| Barton, Benjamin I. |
| Winter sea ice has declined in the Barents Sea and there is growing evidence that the low sea ice here coincides with cold, winter surface air temperature in Europe and Asia. Atlantic Water (AW) transported into the Barents Sea is warming and its temperature variability is correlated with variability in sea ice extent. As AW extends into the Barents Sea it is modified into a cooler, fresher water mass called BarentsSea Water (BSW). There are limited observations of BSW despite its importance in the Arctic Ocean system, leading to the question, how does the seasonal sea ice impact ocean stratification and mean flow?First, satellite observations are used to find the Polar Front, a water mass boundary between BSW and fresher Arctic Water to the north. The sea... |
| Tipo: Text |
Palavras-chave: Barents Sea Water; Front polaire; Banquise; Satellite; Modélisation; Model; Barents Sea Water; Polar front; Sea ice; Satellite. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00692/80424/83560.pdf |
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| Heath, Michael R.; Speirs, Douglas C.; Steele, John H.. |
| Climate fluctuations and human exploitation are causing global changes in nutrient enrichment of terrestrial and aquatic ecosystems and declining abundances of apex predators. The resulting trophic cascades have had profound effects on food webs, leading to significant economic and societal consequences. However, the strength of cascades-that is the extent to which a disturbance is diminished as it propagates through a food web-varies widely between ecosystems, and there is no formal theory as to why this should be so. Some food chain models reproduce cascade effects seen in nature, but to what extent is this dependent on their formulation? We show that inclusion of processes represented mathematically as density-dependent regulation of either consumer... |
| Tipo: Text |
Palavras-chave: Bottom-up; Density dependence; Food chain; Food web; Harvesting; Model; Predator-prey; Simulation; Top-down. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00171/28249/26505.pdf |
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| Registros recuperados: 127 | |
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