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| Luz-Freire,Hévila Prates; Trindade,Diego Pires Ferraz da; Sá-Neto,Raymundo José de; Corrêa,Michele Martins. |
| Studies on the survival of species are essential to understanding their biology and to developing effective conservation and management plans. This study aimed to determine the best model to explain the survival of the species Melocactus conoideus on the basis of time, density, age structure and habitat location, as well as to describe the interactions among those factors. The study was conducted in three M. conoideus habitat patches in the municipality of Vitória da Conquista, in the state of Bahia, Brazil, only one of which was within a "conservation unit" (protected area). In each patch, we selected 120 specimens of M. conoideus, which were marked with identification plates and classified by developmental stage and density. The survival of those... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cactus; Mortality; Population ecology; Spatial aggregation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200016 |
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| Woodard, Joshua D.; Garcia, Philip. |
| Previous studies identify limited potential efficacy of weather derivatives in hedging agricultural exposures. In contrast to earlier studies which investigate the problem at low levels of aggregation, we find using straight forward temperature contracts that better weather hedging opportunities exist at higher levels of spatial aggregation. Aggregating production exposures reduces idiosyncratic (i.e. localized or region specific) risk, leaving a greater proportion of the total risk in the form of systemic weather risk which can be effectively hedged using weather derivatives. The aggregation effect suggests that the potential for weather derivatives in agriculture may be greater than previously thought, particularly for aggregators of risk such as... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Weather derivatives; Spatial aggregation; Corn; Yield risk; Crop insurance; Hedging; Risk and Uncertainty. |
| Ano: 2007 |
URL: http://purl.umn.edu/9832 |
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| Woodard, Joshua D.; Garcia, Philip. |
| Previous studies identify limited potential efficacy of weather derivatives in hedging agricultural exposures. In contrast to earlier studies which investigate the problem at low levels of aggregation, we find that better weather hedging opportunities may exist at higher levels of spatial aggregation. Aggregating production exposures reduces idiosyncratic risk, leaving a greater proportion of the total risk in the form of systemic weather risk which can be effectively hedged using relatively simple weather derivatives. The aggregation effect suggests that the potential for weather derivatives in agriculture may be greater than previously thought, particularly for aggregators of risk such as reinsurers. |
| Tipo: Journal Article |
Palavras-chave: Crop insurance; Hedging; Reinsurance; Spatial aggregation; Systemic risk; Weather derivatives; Risk and Uncertainty. |
| Ano: 2008 |
URL: http://purl.umn.edu/36705 |
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