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Registros recuperados: 7
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A length-structured spatially explicit model for estimating hake growth and migration rates ArchiMer
Drouineau, Hilaire; Mahevas, Stephanie; Bertignac, Michel; Duplisea, Daniel.
Drouineau, H., Mahevas, S., Bertignac, M., and Duplisea, D. 2010. A length-structured spatially explicit model for estimating hake growth and migration rates. - ICES Journal of Marine Science, 67: 1697-1709.
Tipo: Text Palavras-chave: Growth; Length-structured model; Merluccius merluccius; Migration; Spatial model.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00016/12714/9767.pdf
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Assessing the impact of different management options using ISIS-Fish*: the French Merluccius merluccius Nephrops norvegicus mixed fishery of the Bay of Biscay ArchiMer
Drouineau, Hilaire; Mahevas, Stephanie; Pelletier, Dominique; Beliaeff, Benoit.
In this paper, we present an approach to compare the impact of different management options oil the dynamics of a mixed fishery. We used ISIS-Fish, a simulation tool aimed at evaluating the impact of spatial and seasonal management measures on the dynamics of mixed fisheries. The French Nephrops norvegicus (Norway lobster) Merluccius merluccius (hake) mixed fishery of the Bay of Biscay was chosen as a Study case. First, we parameterised the Population and exploitation models. We then selected several management measures, including marine protected fishermen's reaction to each measure. Then, a sensitivity analysis (MPAs) and total allowable catches (TAC), and parameterised fish sensitivity analysis was performed according to a fractional factorial...
Tipo: Text Palavras-chave: Simulation design; Sensitivity analysis; Management measures; Spatial model; Fisheries dynamics.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1340.pdf
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GENERIC COMMODITY PROMOTION AND PRODUCT DIFFERENTIATION AgEcon
Crespi, John M..
This paper considers whether generic promotion lowers the differentiation among competing brands as claimed in the 1997 Supreme Court case (Wileman et al. v. Glickman). Commodity promotion is modeled as a multi-stage game where products are vertically differentiated. Analytical results show that if the benefits of generic advertising from increased demand are outweighed by the costs from lower product differentiation then high-quality producers will not benefit from generic promotion but producers of lower-quality goods may.
Tipo: Conference Paper or Presentation Palavras-chave: Generic advertising; Product differentiation; Spatial model; Marketing.
Ano: 1999 URL: http://purl.umn.edu/21488
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Integrated assessment of the spatial distribution and structural dynamics of deep benthic marine communities ArchiMer
Jansen, Jan; Dunstan, Piers K.; Hill, Nicole A.; Koubbi, Philippe; Melbourne‐thomas, Jessica; Causse, Romain; Johnson, Craig R..
Characterising the spatial distribution and variation of species communities and validating these characteristics with data from the field are key elements for an ecosystem‐based approach to management. However, models of species distributions that yield community structure are usually not linked to models of community dynamics, constraining understanding and management of the ecosystem, particularly in data‐poor regions. Here we use a qualitative network model to predict changes in Antarctic benthic community structure between major marine habitats characterised largely by seafloor depth and slope, and use multivariate mixture models of species distributions to validate the community dynamics. Further, we then assess how future increases in primary...
Tipo: Text Palavras-chave: Deep‐sea; Ecosystem structure; Ecosystem dynamic; Southern Ocean; Antarctica; Continental shelf; Upper slope; Species archetype model; Qualitative network model; Spatial model.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00599/71143/69460.pdf
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Model-Based Estimation of Collision Risks of Predatory Birds with Wind Turbines Ecology and Society
Eichhorn, Marcus; UFZ-Helmhotz Centre for Environmental Research; marcus.eichhorn@ufz.de; Johst, Karin; UFZ-Helmhotz Centre for Environmental Research; karin.johst@ufz.de; Seppelt, Ralf; UFZ-Helmhotz Centre for Environmental Research; ralf.seppelt@ufz.de; Drechsler, Martin; UFZ-Helmholtz Centre for Environmental Research; martin.drechsler@ufz.de.
Tipo: Peer-Reviewed Reports Palavras-chave: Collision risk; Foraging behavior; Impact assessment; Individual-based model; Milvus milvus; Red Kite; Spatial model; Wind power.
Ano: 2012
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Modeling Distribution and Abundance of Antarctic Baleen Whales Using Ships of Opportunity Ecology and Society
Williams, Rob; Sea Mammal Research Unit; rmcw@st-andrews.ac.uk; Hedley, Sharon L.; University of St. Andrews; slc@st-andrews.ac.uk; Hammond, Philip S.; University of St. Andrews; psh2@st-andrews.ac.uk.
Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ship time to conduct design-unbiased line transect surveys may be simply out of reach for researchers in many countries, which nonetheless grapple with problems of conservation of endangered species, by-catch of small cetaceans in commercial fisheries, and progression toward ecosystem-based fisheries management. Recently developed spatial modeling techniques show promise for estimating wildlife abundance using non-randomized surveys, but have yet to receive much field-testing in areas where designed surveys have also been conducted....
Tipo: Peer-Reviewed Reports Palavras-chave: Abundance; Antarctic; Baleen whale; Cetacean; Distance sampling; Distribution; Line transect; Platform of opportunity; Spatial model.
Ano: 2006
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Simulating the effects of decoupled transfer payments using the land use model ProLand AgEcon
Weinmann, Bernd; Schroers, Jan Ole; Sheridan, Patrick.
This paper describes the bio-economic land use model ProLand and presents selected results for scenarios of coupled and fully decoupled Pillar One transfer payments under the European Union’s Common Agricultural Policy (CAP). The basic assumption for the model is that land users select the land use alternative from a set of agricultural and silvicultural land use systems which is expected to generate the highest possible land rent. The model is used to estimate effects of fully decoupled transfer payments on land use in a less favoured region in Hesse, Germany. The results confirm that the CAP Reform removes the distorting effects of coupled transfer payments. The extent and direction of land use changes are spatially variant. Overall, the CAP Reform will...
Tipo: Journal Article Palavras-chave: CAP Reform; Land use modelling; Decision support; Spatial model; ProLand; Agricultural and Food Policy; Land Economics/Use.
Ano: 2006 URL: http://purl.umn.edu/97191
Registros recuperados: 7
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