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| Registros recuperados: 19.480 | |
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| Facon, B.; Genton, B.J.; Shykoff, J.; Jarne, P.; Estoup, A.; David, P.. |
| Studies of bioinvasions have revealed various strategies of invasion, depending on the ecosystem invaded and the alien species concerned. Here, we consider how migration (as a demographic factor), as well as ecological and evolutionary changes, affect invasion success. We propose three main theoretical scenarios that depend on how these factors generate the match between an invader and its new environment. Our framework highlights the features that are common to, or differ among, observed invasion cases, and clarifies some general trends that have been previously highlighted in bioinvasions. We also suggest some new directions of research, such as the assessment of the time sequence of demographic, genetic and environmental changes, using detailed temporal... |
| Tipo: Journal Article |
Palavras-chave: INVASION BIOLOGIQUE; ESPECE ENVAHISSANTE BIOINVASION. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008e52b4e4b&uri=/notices/prodinra1/2008/08/ |
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| FRAGALLE, E. P.. |
| A informação é matéria-prima para a inclusão na sociedade do conhecimento, caracterizada pela velocidade de mudanças na ciência, nas tecnologias de informação e na comunicação, neste início do século XXI. O aproveitamento eficiente e eficaz do conhecimento científico, o acesso a ele e sua disseminação para a sociedade é um desafio de cientistas e comunicadores. Com este objetivo, a Fundação de Amparo à Pesquisa no Estado de São Paulo (Fapesp) criou os Centros de Pesquisa, Inovação e Difusão (CEPID). Eles têm em sua missão a difusão do conhecimento científico, entretanto, a comunicação midiática é realizada de maneira distinta nas unidades, ressentindo-se, inclusive, da falta de profissionais especializados nesse trabalho, além de outras carências. A... |
| Tipo: Tese/dissertação (ALICE) |
Palavras-chave: Gestão da comunicação; Gestão da informação; Comunicação científica; Pesquisa em rede; Comunicação midiática. |
| Ano: 2006 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/111410 |
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| Walker, Brian; CSIRO; Brian.Walker@csiro.au; Gunderson, Lance; Emory Universitry; lgunder@emory.edu; Kinzig, Ann; Arizona State University; Ann.Kinzig@asu.edu; Folke, Carl; Stockholm University; calle@system.ecology.su.se; Carpenter, Steve; University of Wisconsin; srcarpen@wisc.edu; Schultz, Lisen; Stockholm University; lisen@ecology.su.se. |
| This paper is a work-in-progress account of ideas and propositions about resilience in social-ecological systems. It articulates our understanding of how these complex systems change and what determines their ability to absorb disturbances in either their ecological or their social domains. We call them “propositions” because, although they are useful in helping us understand and compare different social-ecological systems, they are not sufficiently well defined to be considered formal hypotheses. These propositions were developed in two workshops, in 2003 and 2004, in which participants compared the dynamics of 15 case studies in a wide range of regions around the world. The propositions raise many questions, and we present a list of... |
| Tipo: Peer-Reviewed article |
Palavras-chave: Resilience; Social-ecological systems; Change; Propositions; Synthesis; Theory; Adaptatability; Transformability. |
| Ano: 2006 |
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| Huang, Chung L.; Lin, Biing-Hwan. |
| The food habits and dietary patterns of American consumers are changing and they are increasingly demanding food products that possess certain attributes relating to how the food was produced or processed. The objectives of the study are to analyze household purchase of fresh tomatoes and to determine the magnitudes of the price premium paid for the organic tomatoes by estimating a hedonic price model. The study uses the 2003 ACNielsen Homescan panel data. The data set represents a nationally representative panel of U.S. households, which provide food purchase data for at-home consumption. For empirical implementation, parameters of the hedonic model were estimated using the Box-Cox transformation procedure. The results indicated that consumers value the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Box-Cox transformation; Fresh tomatoes; Hedonic price; Organic produce; Product attributes; Crop Production/Industries; D1; Q11. |
| Ano: 2006 |
URL: http://purl.umn.edu/25404 |
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| Edmeades, Svetlana. |
| The paper extends the household hedonic model, as a non-market valuation tool, by estimating a supply function for variety attributes of a subsistence crop in a developing country. The model is applied to bananas in Uganda, making use of disaggregated data on variety-specific farm-gate banana bunch prices and attributes. The hedonic analysis is applied at the farm-gate, the first link in the market chain, while accounting for the semi-subsistence nature of banana producing households. Within the framework of the agricultural household, where consumption and production decisions are non-separable, prices reflect the implicit marginal valuation of both consumption and production attributes jointly. The paper is motivated by the need to quantify the value of... |
| Tipo: Report |
Palavras-chave: Small farms; Households models; Agricultural sector; Crops; Economic aspects; Crop diversification; Variety attributes; Decision making; Crop Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/55424 |
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| Guilhoto,Joaquim J. M.; Silveira,Fernando G.; Ichihara,Silvio M.; Azzoni,Carlos R.. |
| Este trabalho teve por objetivo avaliar o nível de atividade do agronegócio da agricultura familiar no Brasil, para o período de 1995 a 2003. Através dos Modelos de Insumo-Produto foi possível estimar a importância do Produto Interno Bruto do agronegócio familiar no contexto nacional. Concretamente, os resultados demonstram que cerca de 1/3 do agronegócio brasileiro advém da produção agropecuária realizada pelos agricultores familiares, cabendo observar, também, que o desempenho recente da agropecuária familiar e de todo o complexo a ela articulada vem sendo bastante positivo, superando, inclusive, as taxas de crescimento relativas ao segmento patronal. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agronegócio familiar; Produto Interno Bruto; Brasil; Insumo-produto. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-20032006000300002 |
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| Registros recuperados: 19.480 | |
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