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| Registros recuperados: 63 | |
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| Cavender-Bares, Jeannine; Department of Ecology, Evolution and Behavior, University of Minnesota; Institute on Environment, University of Minnesota; cavender@umn.edu; Polasky, Stephen; Department of Applied Economics, University of Minnesota; Department of Ecology, Evolution and Behavior, University of Minnesota; Institute on Environment, University of Minnesota; polasky@umn.edu; King, Elizabeth; Biological Sciences, Odum School of Ecology, University of Georgia; Warnell School of Forestry and Natural Resources, University of Georgia; egking@uga.edu. |
| Achieving sustainability, i.e., meeting the needs of current populations without compromising the needs of future generations, is the major challenge facing global society in the 21st century. Navigating the inherent trade-offs between provisioning, regulating, cultural, and supporting ecosystem services, and doing so in a way that does not compromise natural capital needed to provide services in the future, is critical for sustainable resource management. Here we build upon existing literature, primarily from economics and ecology, to present an analytical framework that integrates (1) the ecological mechanisms that underpin ecosystem services, (2) biophysical trade-offs and inherent limits that constrain management options, (3) preferences and values... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Dynamics; Ecosystem services; Efficiency frontier; Management constraints; Preferences; Stakeholders; Time lags; Trade-offs. |
| Ano: 2015 |
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| Walker, Brian; CSIRO Sustainable Ecosystems; Brian.Walker@csiro.au; Steffen, Will; ; Will.Steffen@dwe.csiro.au. |
| Global change is the net effect of individual and interactive effects of changes in land use, atmospheric composition, biological diversity, and climate. A synthesis of the past six years' activities of the Global Change and Terrestrial Ecosystems project of the IGBP (International Geosphere-Biosphere Programme) deals with global change effects as ecosystem responses and living with global change. Ecosystem responses are considered in terms of changes in function and vegetation composition/structure. Field experiments of elevated CO2 effects on aboveground biomass show, on average, a positive effect on biomass, ranging from -20% to +80%. Some early predictions of CO2 effects (C3 vs. C4 plants, N-fixers, C:N in litter) are not generally supported, and it... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agriculture; Biomes; Carbon dioxide; Climate; Dynamics; Ecosystem functioning; Global change; Impacts; Land use; Terrestrial biosphere; Vegetation changes.. |
| Ano: 1997 |
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| BERTANI,DANIELA FESSEL; RODRIGUES,RICARDO RIBEIRO; BATISTA,JOÃO LUIZ FERREIRA; SHEPHERD,GEORGE JOHN. |
| Neste trabalho, foram estudadas a composição florística e a estrutura fitossociológica da vegetação em um fragmento de floresta ribeirinha, ao longo do rio Passa Cinco, Ipeúna, SP. Foram amostradas 157 parcelas contínuas de 5 x 10 m, em uma área de 0,785 ha. Foram feitas medidas de diâmetro e mapeados todos os indivíduos com DAP maior ou igual a 5 cm, em 1989 e 1998. Constatou-se a presença de um mosaico vegetacional e discutiram-se os possíveis fatores definidores deste mosaico. Foram, também, verificadas as alterações florísticas e fitossociológicas na área após nove anos. As análises multivariadas da vegetação mostraram a presença de três grupos vegetacionais com grande sobreposição aos três tipos de solo identificados na área. As análises quantitativas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical riverine forest; Tree communities; Dynamics; Soil; Topography. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100002 |
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| Leckler, Fabien; Ardhuin, Fabrice; Peureux, Charles; Benetazzo, Alvise; Bergamasco, Filippo; Dulov, Vladimir. |
| The energy level and its directional distribution are key observations for understanding the energy balance in the wind-wave spectrum between wind-wave generation, nonlinear interactions, and dissipation. Here, properties of gravity waves are investigated from a fixed platform in the Black Sea, equipped with a stereo video system that resolves waves with frequency f up to 1.4 Hz and wavelengths from 0.6 to 11 m. One representative record is analyzed, corresponding to young wind waves with a peak frequency fp = 0.33 Hz and a wind speed of 13 m s−1. These measurements allow for a separation of the linear waves from the bound second-order harmonics. These harmonics are negligible for frequencies f up to 3 times fp but account for most of the energy at higher... |
| Tipo: Text |
Palavras-chave: Circulation; Dynamics; Waves; Oceanic; Observational techniques and algorithms; Remote sensing. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00284/39524/38017.pdf |
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| Gohin, Alexandre; Rault, Arnaud. |
| Epizootic outbreaks such as Foot and Mouth Disease are of great concern for agriculture. In this paper, we quantify the potential dynamic impacts of such a disease on Brittany, a French region with a strong livestock sector. We develop a dynamic computable general equilibrium model with rational expectations that allows us to measure the impacts of culling infected animals and restraining movements of live animals on the livestock sectors and downstream food industries. Our results show that economic losses are spread over many periods even with a one-time shock. The impacts on the primary sectors and downstream food sectors do not move in parallel. The food industries suffer most in the first period while the negative impacts on agriculture are mostly... |
| Tipo: Presentation |
Palavras-chave: Dynamics; CGE; Animal disease; Catastrophic event; Risk and Uncertainty; Q11; Q18. |
| Ano: 2012 |
URL: http://purl.umn.edu/122438 |
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| Jaramillo-González, J.; Acosta, A.. |
| Los arrecifes coralinos del mundo han sufrido un declive durante las pasadas tres décadas. Estos cambios se han evaluado en arrecifes en franja; sin embargo, se desconoce si los tensores causantes de dichos cambios afectan la dinámica de una comunidad coralina en los primeros estados de la sucesión antes del desarrollo de un arrecife. Para resolver este interrogante, se monitoreó durante 2004, 2005 y 2006 una comuniddad coralina aislada en San Andrés. Se compararon temporalmente la abundancia, cobertura y mortalidad parcial sufrida por la comjnidad coralina y sus poblaciones de coral dominantes. La comunidad coralina no presentó variación estadística en riqueza, abundancia, cobertura, ni en área de mortalidad parcial. Sin embargo, esta comunidad si varió... |
| Tipo: Journal Contribution |
Palavras-chave: Coral; Dynamics; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3605 |
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| Bojnec, Stefan; Ferto, Imre. |
| Trade balances and unit values in Hungarian and Slovenian bilateral agri-food trade with Austria, Germany and Italy, respectively, to distinguish types of the one-way and the two-way trade flows, categories of price competition and categories of quality competition in the twoway trade flows, their dynamics and stability over time are analyzed. The two-way matched trade flows prevail among trade types. In the matched two-way bilateral agri-food trade there is prevalence of categories of price competition over categories of non-price competition, but varies across trading partners. In Hungarian agri-food trade the first category of successful price competition and the third category of successful non-price or quality competition prevail, suggesting... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Competition; Trade types; Dynamics; Mobility index; F12; Q17; Q18; International Relations/Trade. |
| Ano: 2006 |
URL: http://purl.umn.edu/25760 |
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| Weiss, Christoph R.; Briglauer, Wolfgang. |
| This paper examines the impact of various farm and household characteristics (such as farm size, the off-farm employment status, the farm operator's age and schooling and the number of family members) on the level as well as the dynamics of on-farm diversification. Using linked census data for Upper-Austria from 1980, 1985 and 1990 we provide evidence that smaller farms are more specialised and also tend to increase the degree of specialisation over time more quickly than large farms. A significantly lower degree of diversification (higher degree of specialisation) as well as a stronger reduction in diversification over time is also reported for businesses operated by older, less educated, part-time farm operators. The analysis of diversification dynamics... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Diversification; Farm Sector; Dynamics; Panel Data; Farm Management. |
| Ano: 2002 |
URL: http://purl.umn.edu/24929 |
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| Torres,G; Andrade,C. |
| En Bahía Aeolián es un puerto que esta sometido al tráfico marítimo principalmente turístico, donde se efectúa el centro de distribución comercial de combustibles para las mismas. En el agua de lastre y casco de los barcos se transportan organismos no deseados (virus, bacterias, algas que causan plagas o enfermedades), que se han propagado a nivel mundial, afectando algunos ecosistemas naturales (Waite et al., 2003), generando grandes problemas que siguen afectando tanto a países desarrollados como en vías de desarrollo. Existen escasas investigaciones del plancton en la Bahía Aeolián, el objetivo del presente estudio fue caracterizar una Base de datos de la biodiversidad el fitoplancton y zooplancton del ecosistema marino costero del Puerto Baltra y... |
| Tipo: Preprint |
Palavras-chave: Plankton; Ocean tides; Dynamics. |
| Ano: 2014 |
URL: http://hdl.handle.net/1834/5455 |
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| Lybbert, Travis J.; Galarza, Francisco B.; McPeak, John G.; Barrett, Christopher B.; Boucher, Stephen R.; Carter, Michael R.; Chantarat, Sommarat; Fadlaoui, Aziz; Mude, Andrew G.. |
| The effective design and implementation of interventions that reduce vulnerability and poverty require a solid understanding of underlying poverty dynamics and associated behavioral responses. Stochastic and dynamic benefit streams can make it difficult for the poor to learn the value of such interventions to them. We explore how dynamic field experiments can help (i) intended beneficiaries to learn and understand these complicated benefit streams, and (ii) researchers to better understand how the poor respond to risk when faced with nonlinear welfare dynamics. We discuss and analyze dynamic risk valuation experiments in Morocco, Peru, and Kenya. |
| Tipo: Journal Article |
Palavras-chave: Poverty; Risk and uncertainty; Dynamics; Experiments; Kenya; Morocco; Peru; International Development; Research Methods/ Statistical Methods; Risk and Uncertainty. |
| Ano: 2010 |
URL: http://purl.umn.edu/90791 |
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| Wittwer, Glyn; Vere, David T.; Jones, Randall E.; Griffith, Garry R.. |
| A recent analysis indicated that the direct financial cost of weeds to Australia’s winter grain sectorwas approximately $A1.2bn in 1998–1999. Costs of thismagnitude represent a large recurring productivity loss in an agricultural sector that is sufficient to impact significantly on regional economies.Using amulti-regional dynamic computable general equilibrium model, we simulate the general equilibrium effects of a hypothetical successful campaign to reduce the economic costs of weeds. We assume that an additional $50m of R&D spread over five years is targeted at reducing the additional costs and reduced yields arising from weeds in various broadacre crops. Following this R&D effort, one-tenth of the losses arising from weeds is temporarily... |
| Tipo: Article |
Palavras-chave: CGE modelling; Dynamics; Weed management; Crop Production/Industries. |
| Ano: 2005 |
URL: http://purl.umn.edu/118584 |
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| Registros recuperados: 63 | |
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