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Programme coordonné Ecotron sur le site d'Arcachon (Aquitaine, France) : contrôle de la production biologique marine dans un écosystème lagunaire aménagé (réservoirs à poissons) - Bilan, synthèse et perspectives ArchiMer
Lasserre, Pierre.
Coordinated ECOTRON Program on the Arcachon Basin (Aquitaine, France) : Control of marine biological production in a man-modified lagoon ecosystem (fish ponds). Results, synthesis and prospects. The "fish reservoirs" of the Arcachon Basin consist of eutrophic lagoon ecosys­tems, empirically exploited for extensive amphihaline fish culture (grey mullets, sea bass, eels, sea breams). The 1000 hectares of exploited farms, well integrated in a traditional socio-economic context, are presently not adapted for various reasons.The coordinate researches, which have been developed at Arcachon since 1974, within the ECOTRON (CNEXO) Program, show that these highly productive man modified ecosystems are well adapted for the development of semi-intensive aqua­culture....
Tipo: Text Palavras-chave: Lagunes côtières exploitées; Réservoirs à poissons; Bassin d'Arcachon; Fonctionnement écosystème; Contrôle productivité; Modélisation; Développement potentiel; Exploited coastal lagoons; Fish ponds; Arcachon Bay; Ecosystem functioning; Productivity control; Modelling; Potential development.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41676/40885.pdf
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Projecting changes in the distribution and productivity of living marine resources: A critical review of the suite of modeling approaches used in the large European project VECTORS ArchiMer
Peck, Myron A.; Arvanitidis, Christos; Butenschon, Momme; Canu, Donata Melaku; Chatzinikolaou, Eva; Cucco, Andrea; Domenici, Paolo; Fernandes, Jose A.; Gasche, Loic; Huebert, Klaus B.; Hufnagl, Marc; Jones, Miranda C.; Kempf, Alexander; Keyl, Friedemann; Maar, Marie; Mahevas, Stephanie; Marchal, Paul; Nicolas, Delphine; Pinnegar, John K.; Rivot, Etienne; Rochette, Sebastien; Sell, Anne F.; Sinerchia, Matteo; Solidoro, Cosimo; Somerfield, Paul J.; Teal, Lorna R.; Travers-trolet, Morgane; Van De Wolfshaar, Karen E..
We review and compare four broad categories of spatially-explicit modelling approaches currently used to understand and project changes in the distribution and productivity of living marine resources including: 1) statistical species distribution models, 2) physiology-based, biophysical models of single life stages or the whole life cycle of species, 3) food web models, and 4) end-to-end models. Single pressures are rare and, in the future, models must be able to examine multiple factors affecting living marine resources such as interactions between: i) climate-driven changes in temperature regimes and acidification, ii) reductions in water quality due to eutrophication, iii) the introduction of alien invasive species, and/or iv) (over-)exploitation by...
Tipo: Text Palavras-chave: Distribution; Modelling; Habitat; Resources; Man-induced effects.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00337/44845/44436.pdf
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Putative pathogenesis-related genes within Solanum nigrum L. var.Americanum genome: isolation of two genescoding for PR5-like proteins, phylogenetic and sequence analysis. Repositório Alice
CAMPOS, M. A.; RIBEIRO, S. G.; RIGDEN, D. J.; MONTE, D. C.; SA, M. F. G. de.
Tipo: Separatas Palavras-chave: Americanum; PCR; Pathogenenesis-related proteins; Osmotin-like proteins; PR-5 proteins; Modelling; Black nightshade; Solanaceae; Solanum nigrum; Phylogeny.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/184924
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REGIONAL IMPACT ANALYSIS OF EUROPEAN POLICY SPENDING IN A RURAL REMOTE AREA (CAITHNESS & SUTHERLAND, SCOTLAND, UK) AgEcon
Bergmann, Holger; Thomson, Kenneth J..
A modified version of a system dynamics model constructed for an EU-wide case-study project (TOP-MARD) using STELLA software was used to simulate the effects of a number of development scenarios for a remote rural area in Northern Scotland, i.e. Caithness & Sutherland, which is characterised by a high regional importance of agriculture for the local economy. In this paper, the context of the modelling work in policy and socio-economic terms is first described. This is followed by the specification of the model and of the several modelling scenarios, which relate to the reconfiguration of Pillar 2 spending within the area and an reversal of recent Structural Funds spending for 2007 onwards. The modelling results are discussed, in terms of regional...
Tipo: Conference Paper or Presentation Palavras-chave: Modelling; Input-output; Systems dynamics; Rural viability; Marketing.
Ano: 2008 URL: http://purl.umn.edu/52645
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Robust volumetric models for supporting the management of secondary forest stands in the Southern Brazilian Atlantic Forest Anais da ABC (AABC)
OLIVEIRA,LAIO Z.; KLITZKE,ALINE R.; FANTINI,ALFREDO C.; ULLER,HEITOR F.; CORREIA,JEAN; VIBRANS,ALEXANDER C..
Abstract The majority of Atlantic Forest fragments in Southern Brazil are second-growth forests dominated by fast-growing species with considerable market-value timber. Nevertheless, volume prediction models are scarce, especially to estimate tree total volume (i.e., stem plus branches). This study approached the issue through the following aims: to fit and select stem and total volume models (generic and species-specific) using data from 288 harvested trees in a management operation, and to fit generic and species-specific bark factors. The power model embedding diameter at breast height (D) and tree stem or total height (H) presented the greatest prediction strength for both stem and total tree volume. Models including only D to predict total tree volume...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest inventory; Mata Atlântica; Modelling; Regression.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703729
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Sheep enterprises—what are the differences? AgEcon
Graham, Phil; White, A..
Difficult seasonal conditions during the last six years have placed many farms under significant financial pressure. Producers have been looking for enterprise changes which will quickly improve their profits. New breeds have increased the options available, but there is rarely any local production data for them. Information in the media has done little more than create confusion about the true differences between sheep enterprises. Modelling allows this complex question to be looked at in a logical fashion and combines production and financial factors in the comparison. GrassGro® was used at two locations in southern NSW, Yass and Cowra, for the period 1960 to 2007. The results indicated that no enterprise performed consistently better based on profit per...
Tipo: Article Palavras-chave: Sheep enterprises; Modelling; GrassGro®; Profitability; Farm Management.
Ano: 2010 URL: http://purl.umn.edu/120870
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Simulating tropical forage growth and biomass accumulation: an overview of model development and application. Repositório Alice
ANDRADE, A. S.; SANTOS, P. M.; PEZZOPANE, J. R. M.; ARAUJO, L. C. de; PEDREIRA, B. C. e; PEDREIRA, C. G. S.; MARIN, F. R.; LARA, M. A. S..
Crop models can aid the synthesis and application of knowledge, planning of experiments and forecasting in agricultural systems. Few studies have reviewed the uses and applications of these models for tropical forages. The purpose of this study was to review the information available in this scientific area, highlighting the main models, their applications and limitations. Several empirical models have been developed to predict the growth and biomass accumulation of tropical forages, especially for the genera Cynodon, Paspalum, Panicum and Brachiaria. Their application, however, is often location or region specific. The adaptation of mechanistic models to accurately predict biomass accumulation in tropical grasses is still limited. Recent advances have...
Tipo: Artigo de periódico Palavras-chave: Agricultural production; Systems simulator; CROPGRO; Grass; Modelling; Pasture.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1066364
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Simulating tropical forage growth and biomass accumulation: an overview of model development and application. Repositório Alice
ANDRADE, A. S.; SANTOS, P. M.; PEZZOPANE, J. R. M.; ARAUJO, L. C. de; PEDREIRA, B. C. e; PEDREIRA, C. G. S.; MARIN, F. R.; LARA, M. A. S..
Crop models can aid the synthesis and application of knowledge, planning of experiments and forecasting in agricultural systems. Few studies have reviewed the uses and applications of these models for tropical forages. The purpose of this study was to review the information available in this scientific area, highlighting the main models, their applications and limitations. Several empirical models have been developed to predict the growth and biomass accumulation of tropical forages, especially for the genera Cynodon, Paspalum, Panicum and Brachiaria. Their application, however, is often location or region specific. The adaptation of mechanistic models to accurately predict biomass accumulation in tropical grasses is still limited. Recent advances have...
Tipo: Artigo de periódico Palavras-chave: Agricultural production; Systems simulator; CROPGRO; Grass; Modelling; Pasture.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1029145
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Simulation des trajectoires de matière organique dans le Pertuis Breton. Couplage de l'hydrodynamisme et d'un modèle écophysiologique de M. edulis ArchiMer
Pallas Sanz, Enric.
The "Pertuis Breton" is a macrotidal estuary with an important mollusc exploitation of the inter-tidal zones. The main cultivated specie is M.edulis. In 1991, 250 long lines have been immersed in the centre of the bay. It will be able to extend the concession on the basis of the studies results about the trophy capacity of the "Pertuis Breton". Two deterministic models have been developed for to determining the geographical origin of the matter organic sources for the long line mussels culture, and the destine of this matter in the culture park: a) a model of trajectories of the organic matter particles, b) a coupled model of the hydrodynamic conditions and a ecophysiological model of the mussel growth. The result's simulations of the trajectories model...
Tipo: Text Palavras-chave: M. edulis; Potentialité mytilicole; Déplétion; Trajectoires; Modélisation; M. edulis; Trophy capacity; Depletion; Trajectories; Modelling.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00449/56098/57634.pdf
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Sistema web para análise de curvas de progresso de doenças de plantas. Repositório Alice
BRAGA, F. E.; MEIRA, C. A. A..
A fim de minimizar o impacto de doenças em culturas, é desenvolvido um estudo baseado na análise das curvas de progresso de uma ou mais características de determinada desordem no decorrer do tempo. O estudo do comportamento dessas curvas viabiliza o entendimento do ciclo das doenças e a determinação de medidas de prevenção e manejo.
Tipo: Folhetos Palavras-chave: Sistema web; Progresso de doenças de plantas; Modelagem; Plant disease; Modelling; Web system..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/660774
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Spatio-temporal distribution of citrus leafminer and its natural enemies in São Paulo State, Brazil. Repositório Alice
TERNES, S.; BONATO, O.; SA, L. A. N. de; YANG, H. M..
Tipo: Anais e Proceedings de eventos Palavras-chave: Galeopsomyia fausta; Interação parasitóides-praga; Modelagem; Distribuição espaço-temporal; Citros; Parasitoid-pest interactions; Modelling; Spatio-temporal distribution; Phyllocnistis Citrella; Citrus.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/7878
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Study of thermodynamic water properties and moisture sorption hysteresis of mango skin Ciênc. Tecnol. Aliment.
Souza,Silvio José Ferreira de; Alves,Aline Inácio; Vieira,Érica Nascif Rufino; Vieira,José Antônio Gomez; Ramos,Afonso Mota; Telis-Romero,Javier.
The equilibrium moisture content for adsorption and desorption isotherms of mango skin was determined using the static gravimetric method at temperatures of 20, 26, 33, 38 and 44 oC in the 0.056 to 0.873 water activity range. Both sorption curves show a decrease in equilibrium moisture content as the temperature increasing. The hysteresis effect was observed at constant water activity. The Guggenheim, Anderson, and de Boer (GAB) model presented the best fitting accuracy among a group of models and was used to determine the thermodynamic properties of water sorption. Integral enthalpy and integral entropy areas showed inverted values for the adsorption and desorption isotherms over the wide range of water activity studied. These values confirm, in energetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural waste; Gravimetric method; Integral properties; Modelling; Water content.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000100157
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Sur l'hydrodynamique de la Baie de Seine. Resultats d''observations et de modelisations ArchiMer
Leprovost, C; Fornerino, M; Villaret, C.
Study of Seine bay hydrodynamics can't be separated from the Channel and continental shelf. The authors' modellings are aimed at the study of this global ladder and the insertion of coastal areas such as the Seine Bay in this context. Two 2-D models are used. One covers only the Channel, and the other from Pas-de-Calais to continental shelf limits including Celtic sea, Channel and southern North Sea. The results are comparated with long time current observations.
Tipo: Text Palavras-chave: Current data; Mathematical models; Modelling; Tidal currents; Current prediction; Water circulation; Hydrodynamics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1259.pdf
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Temporal changes on the effect of rock fragments in interrill soil loss: a simulation experiment and a simple descriptive model IPB - Escola Superior Agrária
Figueiredo, Tomás de; Ferreira, Alfredo; Gonçalves, Dionísio; Poesen, Jean.
Soils with rock fragments have been studied under several aspects in the last years. Research shows that a single pattern in the erosional response of these soils to rainfalls is not always found. In order to contribute to the understanding of this topic, an experiment was carried out, simulating interrill areas covered by rock fragments. This paper specifically aims at presenting and discussing temporal changes on sediment exported from such areas, also introducing a simple descriptive model to represent soil loss temporal evolution. Small bottom perforated boxes, 612 cm2 area, were filled with a silt-loam fine earth, very poor in organic matter, covered with simulated rock fragments and leaned at 10% slope gradient. The experiment comprised the exposure...
Tipo: Article Palavras-chave: Soil erosion; Rock fragments; Wash; Splash; Modelling.
Ano: 2009 URL: http://hdl.handle.net/10198/5269
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The collapse and recovery potential of carbon sequestration by baleen whales in the Southern Ocean ArchiMer
Durfort, Anaelle; Mariani, Gael; Troussellier, Marc; Tulloch, Vivitskaia; Mouillot, David.
Limiting climate warming below 2°C requires both reducing anthropic greenhouse gas emissions and sequestering more atmospheric carbon. Natural Climate Solutions (NCS) rely on the ability of ecosystems to capture and store carbon. Despite the important role of marine megafauna on the ocean carbon cycle, its potential as a NCS has not yet been explored. Here, we quantify the amount of carbon potentially sequestered by five baleen whale species across the Southern Hemisphere between 1890 and 2100 through both the sinking of carcasses after natural death and the fertilisation of phytoplankton by nutrients in faeces. At their pre-exploitation abundances, the five whales could sequester 10.6 106 tonnes of carbon per year (tC.yr-1) but this natural carbon sink...
Tipo: Text Palavras-chave: Natural Climate Solutions; Climate change; Population dynamics; Modelling; Krill.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00682/79434/82038.pdf
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The effect of catch weight on trawl behaviour ArchiMer
Priour, Daniel.
Measurements at sea during fishing trials on bottom trawl, have revealed that the geometry of the trawl is affected by the catch. A series of 27 hauls of around 3h have been carried out during the EFFICHALUT project. This project aimed to find out improvements on the fishing gear in order to reduce the energy consumption. For this project numerous sensors have been used, for bridles tension, doors spread, vertical opening, doors attitude. The measurements show quite clearly that the doors spread decreases and the bridles tension increases along most of the hauls. The doors spread decreases by 1.35m per hour, with a standard deviation of 1.98m/h when the top bridle tension increases of 47kg/h, with a standard deviation of 59kg/h. The mean catch per haul is...
Tipo: Text Palavras-chave: Trawl; Data; Modelling; Doors spread; Bridle tension; Catch weight.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00186/29761/28208.pdf
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The effect of the Mbita Causeway on water currents in the region of Rusinga Channel, Winam Gulf, Lake Victoria: a 3D modelling study with ELCOM OceanDocs
Romero, J.R.; Khisa, P..
The Mbita Causeway in Kenya was constructed in the early 1980’s to link Rusinga Island to the mainland to facilitate the transport of people, goods, and services to the island. One of the effects of the Causeway was to permanently block a secondary connection between Rusinga Channel and the offshore waters of Lake Victoria. This secondary channel may have served as a substantial pathway of exchange between Winam Gulf and Lake Victoria prior to the Causeway. There has been considerable scientific and political debate as to whether decreased flushing within the two bays on either side of the Causeway has occurred and led to poorer lake water quality since the construction of the barrier. In Apr.-May 2005 an intensive field investigation was undertaken to...
Tipo: Proceedings Paper Palavras-chave: Hydrodynamics; Water quality; Channel flow; Development projects; Simulation; Modelling; Flushing; Environmental effects; Water currents; Inland water environment; Hydrodynamics; Http://aims.fao.org/aos/agrovoc/c_3723.
Ano: 2006 URL: http://hdl.handle.net/1834/1473
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The Estimation of Food Demand Elasticities in Canada AgEcon
Pomboza, Ruth; Mbaga, Msafiri Daudi.
Changing consumer and market demands is an important driver behind the challenges and opportunities that are facing the agriculture and agri-food sector in Canada and that will influence the sector's profitability and competitiveness in the future. It is therefore important to understand developments in the consumer demand for agriculture and agri-food products. The report provides updated demand elasticities for fourteen food groups in Canada. The estimates are useful for conducting analysis of the changing structure of the agriculture and agri-food sector and can help quantify the impacts that changes in economic variables and policies that impact those economic variables might have.
Tipo: Report Palavras-chave: Food; Demand; Demand analysis; Elasticities; Price elasticities; Cross price elasticities; Income elasticities; Price; Econometric; Modelling; Agribusiness; Agricultural and Food Policy; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Production Economics; Public Economics.
Ano: 2007 URL: http://purl.umn.edu/52705
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The influence of variability in larval dispersal on the dynamics of a marine metapopulation in the eastern Channel ArchiMer
Ellien, Celine; Thiebaut, Éric; Barnay, Anne-sophie; Dauvin, Jean-claude; Gentil, Franck; Salomon, Jean-claude.
In the English Channel, the polychaete Pectinaria in koreni forms isolated populations confined in bays and estuaries. To determine the influence of larval dispersal variability on the observed stock fluctuations of the three major Pectinaria koreni populations reported along the French coasts of the eastern Channel, larval dispersal was simulated using a 2D hydrodynamical lagrangian model integrating both the tidal residual and the wind-driven circulation. Year-to-year fluctuations of adult stocks were established from benthic surveys carried out between 1973 and 1998. Larval dispersal patterns vary between populations according to the relative importance of tidal advection and eddy diffusion so that local larval retention is maximal where tidal advection...
Tipo: Text Palavras-chave: Pectinaria koreni; Metapopulation; Modelling; Recruitment; Larval dispersal; Pectinaria koreni; Métapopulation; Modélisation; Recrutement; Dispersion larvaire.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-535.pdf
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The Nexus Land-Use Model, an Approach Articulating Biophysical Potentials and Economic Dynamics to Model AgEcon
Souty, Francois; Brunelle, Thierry; Dumas, Patrice; Dorin, Bruno; Ciais, Philippe; Crassous, Renaud.
Interactions between food demand, biomass energy and forest preservation are driving both food prices and land-use changes, regionally and globally. This study presents a new model called Nexus Land-Use which describes these interactions through a generic representation of agricultural intensification mechanisms. The Nexus Land-Use model equations combine biophysics and economics into a single coherent framework to calculate crop yields, food prices, and resulting pasture and cropland areas within 12 regions inter-connected with each other by international trade. The representation of cropland and livestock production systems in each region relies on three components: (i) a biomass production function derived from the crop yield response function to inputs...
Tipo: Working Paper Palavras-chave: Land-use Change; Modelling; Global Biomass Projections; Environmental Economics and Policy; Q11; Q15.
Ano: 2012 URL: http://purl.umn.edu/122859
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