Download A Sand County Almanac (Outdoor Essays & Reflections) by Aldo Leopold PDF

By Aldo Leopold

"We can position this ebook at the shelf that holds the writings of Thoreau and John Muir." San Francisco Chronicle

These incredible graphics of the flora and fauna discover the breathtaking range of the unspoiled American panorama -- the mountains and the prairies, the deserts and the coastlines. a beautiful tribute to our land and a daring problem to guard the area we adore.

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Additional resources for A Sand County Almanac (Outdoor Essays & Reflections)

Example text

For an individual genotype the phenotypic expression of a quantitative character across an environmental factor is called a " r e a c t i o n n o r m " (Woltereck, 1909). It can be r e p r e s e n t e d by a functional response of the genotype to the environmental factor (de Jong, 1995). Now consider a set of genotypes with the same niche positions but different niche widths across an e n v i r o n m e n t a l gradient (Fig. 1). U n d e r the assumption that the fitness response (shown in a g r a p h of the niche) is related to the response of some resource-use character such as rooting d e p t h (shown in a reaction n o r m ) in each genotype, the generalist genotypes in the set are expected to have a m o r e plastic response in the resource-use character than the specialist genotypes.

Genostasis and the limits to evolution. B 333, 289-305. Curtis, P. , and Teeri, J. A. (1992). Seasonal responses of leaf gas exchange to elevated carbon dioxide in 22, 1320-1325. Curtis, P. , Snow, A. , and Miller, A. S. (1994). Genotype-specific effects of elevated CO2 on fecundity in wild radish 97, 100-105. Drake, B. , and Leadley, P. W. (1991). Canopy photosynthesis of crops and native plant communities exposed to long-term elevated COs. 14, 853-860. 22 Fajer, E. , Bowers, M. , and Bazzaz, F.

And Teeri, J. A. , unpublished. J. (1987). The quantitative genetics of life history and ftness components in L. (Brassicaceae): Ecological and evolutionary consequences of seed-weight variation. 130, 891-914. Mooney, H. , Drake, B. , Luxmoore, R. , Oechel, W. , and Pitelka, L. F. (1991). Predicting ecosystem responses to elevated CO2 concentrations. 41, 96-104. Teramura, A. , and Strain, B. R. (1979). Localized populational differences in the photosynthetic response to temperature and irradiance in 57, 25592563.

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