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| Registros recuperados: 19 | |
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| Pollard, Sharon; The Association for Water and Rural Development; sharon@award.org.za; Biggs, Harry; SANParks; Harry.Biggs@sanparks.org; Du Toit, Derick R; The Association for Water and Rural Development; derick@award.org.za. |
| We aimed to contribute to the field of natural resource management (NRM) by introducing an alternative systemic context-based framework for planning, research, and decision making, which we expressed practically in the development of a decision-making “tool” or method. This holistic framework was developed in the process of studying a specific catchment area, i.e., the Sand River Catchment, but we have proposed that it can be generalized to studying the complexities of other catchment areas. Using the lens of systemic resilience to think about dynamic and complex environments differently, we have reflected on the development of a systemic framework for understanding water and livelihood security under transformation in postapartheid... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Complexity; Decision making; Dynamic; Governance; IWRM; Livelihood security; Resilience; SES; Social-ecological systems; Transdisciplinarity; Transformation. |
| Ano: 2014 |
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| Soudant, Dominique; Beliaeff, Benoit; Thomas, G. |
| Classical regression analysis can be used to model time series. However, the assumption that model parameters are constant over time is not necessarily adapted to the data. In phytoplankton ecology, the relevance of time-varying parameter values has been shown using a dynamic linear regression model (DLRM). DLRMs, belonging to the class of Bayesian dynamic models, assume the existence of a non-observable time series of model parameters, which are estimated on-line, i.e. after each observation. The aim of this paper was to show how DLRM results could be used to explain variation of a time series of phytoplankton abundance. We applied DLRM to daily concentrations of Dinophysis cf. acuminata, determined in Antifer harbour (French coast of the English... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Dinophysis; Time series; Regression; Dynamic; Bayesian. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44784/44490.pdf |
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| Rouze, Heloise; Lecellier, Gael; Saulnier, Denis; Berteaux-lecellier, Veronique. |
| Coral disease outbreaks have increased over the last three decades, but their causal agents remain mostly unclear (e.g., bacteria, viruses, fungi, protists). This study details a 14-month-long survey of coral colonies in which observations of the development of disease was observed in nearly half of the sampled colonies. A bimonthly qPCR method was used to quantitatively and qualitatively evaluate Symbiodinium assemblages of tagged colonies, and to detect the presence of Vibrio spp. Firstly, our data showed that predisposition to disease development in general, and, more specifically, infection by Vibrio spp. in Acropora cytherea depended on which clades of Symbiodinium were harbored. In both cases, harboring clade D rather than A was beneficial to the... |
| Tipo: Text |
Palavras-chave: Coral disease; Dynamic; Resistance; Symbiodinium assemblages; Vibrio. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00307/41848/41080.pdf |
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| Lemonnier, Clarisse; Perennou, Morgan; Eveillard, Damien; Fernandez-guerra, Antonio; Leynaert, Aude; Marié, Louis; Morrison, Hilary G.; Memery, Laurent; Paillard, Christine; Maignien, Lois. |
| Ocean frontal systems are widespread hydrological features defining the transition zone between distinct water masses. They are generally of high biological importance as they are often associated with locally enhanced primary production by phytoplankton. However, the composition of bacterial communities in the frontal zone remains poorly understood. In this study, we investigate how a coastal tidal front in Brittany (France) structures the free-living bacterioplankton communities in a spatio-temporal survey across four cruises, five stations and three depths. We used 16S rRNA gene surveys to compare bacterial community structures across 134 seawater samples and defined groups of co-varying taxa (modules) exhibiting coherent ecological patterns across... |
| Tipo: Text |
Palavras-chave: Marine front; Bacterial communities; Dynamic; Network; Ecological strategies. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00634/74657/74557.pdf |
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| Batabyal, Amitrajeet A.. |
| In a two-period model, economists such as K.J. Arrow, A.C. Fisher, and C. Henry, have shown that when development is both indivisible and irreversible, a developer who ignores the possibility of obtaining new information about the outcome of such development will invariably underestimate the benefits of preservation and hence favor development. In this note, I extend the AFH analysis in two directions. I model the land development problem in a dynamic framework, explicitly specifying an information production function. In such a setting, I then ask and answer the question concerning when development should take place. Forthcoming in Journal of Environmental Management |
| Tipo: Working or Discussion Paper |
Palavras-chave: Development; Dynamic; Information; Uncertainty; Land Economics/Use; D82; Q20. |
| Ano: 1995 |
URL: http://purl.umn.edu/28356 |
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| Clapan, Carmen; Periklis, Drakos; Gadanakis, Yiorgos; Baourakis, George. |
| This paper examines and analyzes the impacts of the reformed CAP as well as the decisions of the new round of negotiations for the olive oil and cotton sectors in the European Union. The aim of this study is to estimate the changes in supply (agricultural supply plus intermediate demand and final production), demand (consumption), price and stock formation (import, export, beginning and ending stocks, national price formation) for both the olive oil and cotton sectors. The model designed for this purpose is partial equilibrium and policy oriented. The objectives of this model are to estimate changes in the production and consumption of the two products concerned, to determine how the reformed Common Agricultural Policy (CAP) and the new round of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Olive oil; Cotton CAP; Trade; Socio economic effects; Partial equilibrium model; Dynamic; Multi market; Synthetic; Policy oriented simulation model; Crop Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/10079 |
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| Richards, Timothy J.; Patterson, Paul M.. |
| The Lanchester model of strategic interaction typically considers only two-firm rivalry and one strategic tool. This paper presents an alternative that considers rivalry among several firms using multiple tools. Marketing decisions are dynamically optimal and use equations of motion for market share that are consistent with optimal consumer choice. Using a single-market case study that consists of five years of monthly data on ready to eat cereal sales, advertising, product development investments and new product introductions, we test our model against a similar Lanchester specification. Non-nested specification tests fail to reject the proposed model, but reject the Lanchester alternative. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Advertising; Brands; Cereal; Dynamic; Lanchester; Oligopoly; Strategic interaction.; Marketing. |
| Ano: 2002 |
URL: http://purl.umn.edu/28545 |
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| Registros recuperados: 19 | |
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