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| Registros recuperados: 16 | |
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| Elmer, Nicole A.; Thurow, Amy Purvis; Johnson, Jason L.; Rosson, C. Parr, III. |
| The Dixit-Pindyck model was applied to examine the hypothesis that uncertainty associated with grapefruit production costs and returns is an important determinant of Texas grapefruit growers' investment behavior. Freezes, price variability, and the effects of expanded trade were analyzed as risk factors. An investment decision rule based on a net-present value calculation would approve a 25-year commitment to a 20-acre grapefruit grove, given a 6-percent discount rate. The modified hurdle rate, calculated using an ex ante version of the Dixit-Pindyck model, is 24 percent. The major source of the risk borne by Texas grapefruit investors is from freezes, rather than from expanded trade. |
| Tipo: Journal Article |
Palavras-chave: Citrus; Ex ante analysis; Dixit-Pindyck model; Freezes; Investment; Simulation; Texas; Trade; Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/15451 |
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| McIntyre,Nancy E.; Nisbett,Richard A.; Abuzeineh,Alisa; Holsomback,Tyla; Chu,Yong-Kyu; Carmichael,Joseph A.; de la Sancha,Noé; Dick,Carl W.; Jonsson,Colleen B.; Owen,Robert D.. |
| Home range size and habitat use of seropositive Oryzomys palustris, primary host for the Bayou strain of hantavirus, were compared to that of seronegative individuals from March 2002 - August 2003 in a longitudinal field population study. There were significant macrohabitat associations with serological status, but selection for most microhabitat variables did not differ between seropositive and seronegative animals. Seropositive adult males moved farther (had larger home ranges) than did seronegatives and were larger in terms of mass and testes size. These patterns may reflect the influence of infection on rodent ecology in terms of dominance and access to preferred habitats. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: BAYV; Habitat selection; Hantavirus; Home range size; Texas. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832009000100008 |
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| RAPOPORT,EDUARDO H.. |
| The percentage of exotic plant species (PES) at large geographic scales is presented in form of political maps (Texas and North America) and of isoline maps (Great Britain). In the latter case it is possible to visualize that higher proportions of alien invaders are present in urban and industrial areas as well as in maritime ports rather than in agricultural lands. Consequently, it is possible to predict that the ratio of urban to agricultural species will continue to increase in the future. Based on a survey of 200 world floras, a multiple regression analysis is presented in order to determine the importance of different factors in the yield of PES values. The contribution to the total variance was: disturbance degree 55 %; total species richness 14%;... |
| Tipo: Journal article |
Palavras-chave: Invasions; Dispersal rates; Cosmopolitanism; Great Britain; North America; Texas. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200012 |
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| Registros recuperados: 16 | |
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