The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
James E Wilen - One of the best experts on this subject based on the ideXlab platform.
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optimal spatial management of renewable resources matching policy scope to ecosystem scale
Journal of Environmental Economics and Management, 2005Co-Authors: James N Sanchirico, James E WilenAbstract:Abstract We investigate the characteristics of an optimally managed spatially explicit renewable resource system. The bioeconomic system is depicted with a metapopulation model where the subpopulations are connected by Dispersal processes and are affected by the spatial distribution of harvesting effort. We characterize the optimal way to distribute harvesting effort over space and time in order to optimize returns from this spatial/dynamic system. We also investigate how the optimal spatial allocation of effort, harvesting, and biomass compare with second-best allocations that ignore spatial processes in this system. We find that optimal instruments reflect the interplay between the spatial gradient of rents and the spatial gradient of Biological Dispersal. Using a simple parameterization to explore qualitative properties in several specific examples, we find that second-best solutions blend or average results of the differentiated case and differ in intuitive ways from first-best optima.
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bioeconomics of spatial exploitation in a patchy environment
Journal of Environmental Economics and Management, 1999Co-Authors: James N Sanchirico, James E WilenAbstract:Abstract This paper presents a model of renewable resource exploitation that incorporates both intertemporal dynamics and spatial movement. The model combines the H. S. Gordon–Vernon Smith hypothesis of a rent dissipation process with Ricardian notions that resources are exploited across space in a pattern dependent upon relative profitabilities. The population structure is characterized in a manner consistent with modern Biological ideas that stress patchiness, heterogeneity, and interconnections among and between patches. Generally, we find the equilibrium patterns of biomass and effort across the system to be dependent upon bioeconomic conditions within each patch and the nature of the Biological Dispersal mechanism between patches. We use simple examples to illustrate how the distribution of effort throughout the system reflects the heterogeneity and the spatial Biological linkages.
James N Sanchirico - One of the best experts on this subject based on the ideXlab platform.
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optimal spatial management of renewable resources matching policy scope to ecosystem scale
Journal of Environmental Economics and Management, 2005Co-Authors: James N Sanchirico, James E WilenAbstract:Abstract We investigate the characteristics of an optimally managed spatially explicit renewable resource system. The bioeconomic system is depicted with a metapopulation model where the subpopulations are connected by Dispersal processes and are affected by the spatial distribution of harvesting effort. We characterize the optimal way to distribute harvesting effort over space and time in order to optimize returns from this spatial/dynamic system. We also investigate how the optimal spatial allocation of effort, harvesting, and biomass compare with second-best allocations that ignore spatial processes in this system. We find that optimal instruments reflect the interplay between the spatial gradient of rents and the spatial gradient of Biological Dispersal. Using a simple parameterization to explore qualitative properties in several specific examples, we find that second-best solutions blend or average results of the differentiated case and differ in intuitive ways from first-best optima.
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bioeconomics of spatial exploitation in a patchy environment
Journal of Environmental Economics and Management, 1999Co-Authors: James N Sanchirico, James E WilenAbstract:Abstract This paper presents a model of renewable resource exploitation that incorporates both intertemporal dynamics and spatial movement. The model combines the H. S. Gordon–Vernon Smith hypothesis of a rent dissipation process with Ricardian notions that resources are exploited across space in a pattern dependent upon relative profitabilities. The population structure is characterized in a manner consistent with modern Biological ideas that stress patchiness, heterogeneity, and interconnections among and between patches. Generally, we find the equilibrium patterns of biomass and effort across the system to be dependent upon bioeconomic conditions within each patch and the nature of the Biological Dispersal mechanism between patches. We use simple examples to illustrate how the distribution of effort throughout the system reflects the heterogeneity and the spatial Biological linkages.
Florian Altermatt - One of the best experts on this subject based on the ideXlab platform.
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emerging predictable features of replicated Biological invasion fronts
Proceedings of the National Academy of Sciences of the United States of America, 2014Co-Authors: Andrea Giometto, Andrea Rinaldo, Francesco Carrara, Florian AltermattAbstract:gorov framework of reaction–diffusion processes captures the observed fluctuations in range expansions. Therefore, predictability of the key features of Biological Dispersal overcomes the inherent Biological stochasticity. Our results establish a causal link from the short-term individual level to the long-term, broad-scale population patterns and may be generalized, possibly providing a general predictive framework for Biological invasions in natural environments.
Andrea Rinaldo - One of the best experts on this subject based on the ideXlab platform.
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emerging predictable features of replicated Biological invasion fronts
Proceedings of the National Academy of Sciences of the United States of America, 2014Co-Authors: Andrea Giometto, Andrea Rinaldo, Francesco Carrara, Florian AltermattAbstract:gorov framework of reaction–diffusion processes captures the observed fluctuations in range expansions. Therefore, predictability of the key features of Biological Dispersal overcomes the inherent Biological stochasticity. Our results establish a causal link from the short-term individual level to the long-term, broad-scale population patterns and may be generalized, possibly providing a general predictive framework for Biological invasions in natural environments.
Laurence Despres - One of the best experts on this subject based on the ideXlab platform.
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landscape does matter disentangling founder effects from natural and human aided post introduction Dispersal during an ongoing Biological invasion
Journal of Animal Ecology, 2020Co-Authors: Stephanie Sherpa, Julien Renaud, Maya Gueguen, Gilles Besnard, Loic Mouyon, Delphine Rey, Laurence DespresAbstract:Environmental features impacting the spread of invasive species after introduction can be assessed using population genetic structure as a quantitative estimation of effective Dispersal at the landscape scale. However, in the case of an ongoing Biological invasion, deciphering whether genetic structure represents landscape connectivity or founder effects is particularly challenging. We examined the modes of Dispersal (natural and human-aided) and the factors (landscape or founders history) shaping genetic structure in range edge invasive populations of the Asian tiger mosquito, Aedes albopictus, in the region of Grenoble (Southeast France). Based on detailed occupancy-detection data and environmental variables (climatic, topographic and land-cover), we modelled A. albopictus potential suitable area and its expansion history since first introduction. The relative role of Dispersal modes was estimated using Biological Dispersal capabilities and landscape genetics approaches using genome-wide SNP dataset. We demonstrate that both natural and human-aided Dispersal have promoted the expansion of populations. Populations in diffuse urban areas, representing highly suitable habitat for A. albopictus, tend to disperse less, while roads facilitate long-distance Dispersal. Yet, demographic bottlenecks during introduction played a major role in shaping the genetic variability of these range edge populations. The present study is one of the few investigating the role of founder effects and ongoing expansion processes in shaping spatial patterns of genetic variation in an invasive species at the landscape scale. The combination of several Dispersal modes and large proportions of continuous suitable habitats for A. albopictus promoted range filling of almost its entire potential distribution in the region of Grenoble only few years after introduction.