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

By Aldo Leopold

ISBN-10: 0345345053

ISBN-13: 9780345345059

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

These miraculous pictures of the wildlife 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 realm we like.

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

Example text

There is essentially no information on how different species of soft-sediment prey recover from sea otter predation. The Pismo clam typifies this lack of knowledge. This species has pelagic larvae that live in the plankton several weeks before settlement (Fitch 1950). We do not know how they are released by local populations, how they disperse in local and regional currents, or how they reach the narrow zone where most adults live. What is known is that recruitment is highly variable in both space and time, with major recruitment events often separated by many years.

1980). In addition, the siphon plates of Tresus spp. provide a hard substratum in regions otherwise dominated by soft sediments. Some 50 species have been found growing on the siphon plates of Tresus nuttallii (Stout 1970). Not only do the deep burrowers provide substrata and refugia for a variety of species, but their burrows also affect the geometry of the porewater system. By increasing the extent and depth of the sediment - water interface, the burrows facilitate the diffusion of solutes across this boundary, creating a complex mosaic of microenvironments (Aller 1982; Aller et a1.

Large Dungeness crabs provided 70% of the caloric intake of some otters, yet were captured on only 9% of the foraging dives at one male area in Nelson Bay (Garshelis 1983). 5 Class and Individual Variation In California, an average of 70% to 73% of all diurnal feeding dives result in the successful capture of prey (Loughlin 1977; Estes et a1. 1981), although a complex array of variables may affect the proportion of successful dives, type of prey obtained, dive times, and foraging tactics (Estes et a1.

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


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