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Assessing phytoplankton realized niches using a French National Phytoplankton Monitoring Network ArchiMer
Hernandez Farinas, Tania; Bacher, Cedric; Soudant, Dominique; Belin, Catherine; Barille, Laurent.
Relating environmental factors to species occurrence is a fundamental step in a better understanding of the community structure, the spatial and temporal dynamics of populations and how species may respond to environmental changes. In this paper, we used phytoplankton occurrence data, from a French national phytoplankton monitoring network, and environmental variables with the aim of characterizing the realized ecological niches of phytoplankton groups. We selected 35 phytoplankton taxa representing the most important taxa in terms of occurrence frequency and abundance along the French coast of the eastern English Channel, the Southern Bight of the North Sea and the Atlantic Ocean. We show that environmental variables such as nutrient concentration, water...
Tipo: Text Palavras-chave: Phytoplankton; Environment; Niche position; Tolerance; Kernel density; Outlying mean index.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00255/36627/35263.pdf
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Payments under the Average Crop Revenue Program: Implications for Government Costs and Producer Preferences AgEcon
Cooper, Joseph C..
This paper develops a stochastic model for comparing payments to U.S. corn producers under the U.S. Senate’s Average Crop Revenue Program (ACR) versus payments under the price-based marketing loan benefit and countercyclical payment programs. Using this model, the paper examines the sensitivity of the density function for payments to changes in expected price levels. We also assess the impact of the choice of yield aggregation used in the ACR payment rate on the mean and variance of farm returns. We find that ACR payments lower the producer’s coefficient of variation of total revenue more than does the price-based support, although ACR may not raise mean revenue as much. While corn farmers in the heartland states might still prefer to receive the...
Tipo: Journal Article Palavras-chave: Domestic support; Counter-cyclical payments; Revenue; Price; Corn; Yield; Pairs bootstrap; Kernel density; Combinatorial optimization; Agricultural and Food Policy.
Ano: 2009 URL: http://purl.umn.edu/49864
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A Revenue-Based Alternative to the Counter-Cyclical Payment Program AgEcon
Cooper, Joseph C..
This paper develops a stochastic model for comparing payments to U.S. corn producers of a revenue-based counter-cyclical payment (R-CCP) that is offered as an alternative in the 2007 House "Farm Bill" (H.R. 2419) to the current price-based CCP (P-CCP). We minimize the potential for miss-specification bias in the model by using nonparametric and semi-nonparametric approaches as specification checks in the model. Using this model, the paper examines the sensitivity of the density function for payments to changes in expected price levels. A mean-variance utility function approach is used to assess producer preferences for choice of CCP program alternative. The results show that as risk reduction instruments at the farm level, there appears to be little...
Tipo: Conference Paper or Presentation Palavras-chave: Domestic support; Counter-cyclical payments; Revenue; Price; Corn; Yield; Pairs bootstrap; Kernel density; Semi-nonparametric; Combinatorial optimization; Agricultural and Food Policy; Crop Production/Industries.
Ano: 2008 URL: http://purl.umn.edu/6197
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ACRE: A Revenue-Based Alternative to Price-Based Commodity Payment Programs AgEcon
Cooper, Joseph C..
This paper develops a stochastic model for estimating the probability density function of the Average Crop Revenue Election (ACRE), a revenue-based commodity support payment that is offered under the 2008 Farm Act as an alternative to the traditional suite of price-based commodity payments, that is, marketing loan benefits and counter-cyclical payments. We minimize the potential for miss-specification bias in the model by using nonparametric and semi-nonparametric approaches as specification checks in the model. Our simulation results show that adding ACRE revenue payments to gross revenue reduced the downside risk in revenue for corn, wheat, and soybean farmers in 2009 in the four locations examined, with reductions ranging from 4% to 25%. Integrating...
Tipo: Conference Paper or Presentation Palavras-chave: Domestic support; Average crop revenue election; Loan deficiency payments; Counter-cyclical payments; Revenue; Price; Corn; Yield; Pairs bootstrap; Kernel density; Semi-nonparametric; Combinatorial optimization; Negative exponential utility function; Agricultural and Food Policy; Demand and Price Analysis.
Ano: 2009 URL: http://purl.umn.edu/49180
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Maize properties for industrial uses Thai Agricultural
Sukoncheun Sringam; Rasamee Supasri.
5 tables
Palavras-chave: Corn; Maize; Varieties; Physical properties; Chemical analysis; Water absorption; Kernel density; Amylose content; ข้าวโพด; คุณสมบัติทางกายภาพ; คุณสมบัติทางเคมี; อะไมโลส; ความหนาแน่นของเมล็ด; ปริมาณ; การดูดซับน้ำ.
Ano: 1983 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4155
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