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Registros recuperados: 3
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Searching Explanations of Nature in the Mirror World of Math Ecology and Society
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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Extinction Risk in Successional Landscapes Subject to Catastrophic Disturbances Ecology and Society
Boughton, David; Pacific Northwest Research Station, U.S. Forest Service; david.boughton@noaa.gov; Malvadkar, Urmila; Princeton University; malvadkr@princeton.edu.
We explore the thesis that stochasticity in successional-disturbance systems can be an agent of species extinction. The analysis uses a simple model of patch dynamics for seral stages in an idealized landscape; each seral stage is assumed to support a specialist biota. The landscape as a whole is characterized by a mean patch birth rate, mean patch size, and mean lifetime for each patch type. Stochasticity takes three forms: (1) patch stochasticity is randomness in the birth times and sizes of individual patches, (2) landscape stochasticity is variation in the annual means of birth rate and size, and (3) turnover mode is whether a patch is eliminated by disturbance or by successional change. Analytical and numerical analyses of the model suggest that...
Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity; Catastrophe; Dispersal; Disturbance; Extinction; Landscape; Metapopulation; Patch dynamics; Patchy population; Succession.
Ano: 2002
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Determinants of Participation in a Catastrophe Insurance Programme: Empirical Evidence from a Developing Country AgEcon
Akter, Sonia; Brouwer, Roy; Chowdhury, Saria; Aziz, Salina.
The paper presents empirical evidence of the determinants of catastrophe insurance participation in one of the poorest and most disaster prone countries in the world. In a large-scale household survey carried out in 2006 we ask 3,000 residents in six different districts in Bangladesh facing various environmental risk exposure levels about their willingness to participate in a catastrophe insurance programme. Combining factors put forward in risk theory and economics, we estimate a model of insurance participation. We show that the household decision to participate in the insurance programme differs depending on both exogenous and endogenous risk exposure levels. As predicted by micro-economic theory, ability to pay, measured in terms of household income...
Tipo: Conference Paper or Presentation Palavras-chave: Natural disasters; Catastrophe; Insurance; Participation; Risk; Bangladesh; Consumer/Household Economics; Environmental Economics and Policy; International Development; Risk and Uncertainty; Q54.
Ano: 2008 URL: http://purl.umn.edu/5984
Registros recuperados: 3
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