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New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas
Inputs of nitrogen to terrestrial and aquatic ecosystems have increased several-fold over the last one hundred and fifty years, with the steepest increases during the last four decades. The expansion of fertilizer manu facture and use, the increase in fossil fuel combustion, the intensification of animal husbandry, and widespread cultivation of N2 fixing crops have all contributed to the dramatic increase in N inputs. The increase has been most rapid in Northern Hemisphere (NH) temperate ecosystems, but presently subtropical and tropical regions of Asia are also experiencing an explosive increase in N inputs to terrestrial ecosystems (W. Chameides, pers. comm. ; Galloway et al. 1996). Projec...
Fisheries Review
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Technical Series
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Territories of Conflict
This interdisciplinary volume investigates the cultural and political landscapes of Colombia through citizenship, displacement, local and global cultures, grass-root movements, political activism, human rights, environmentalism, and media productions.
Ocean Acidification
The ocean has absorbed a significant portion of all human-made carbon dioxide emissions. This benefits human society by moderating the rate of climate change, but also causes unprecedented changes to ocean chemistry. Carbon dioxide taken up by the ocean decreases the pH of the water and leads to a suite of chemical changes collectively known as ocean acidification. The long term consequences of ocean acidification are not known, but are expected to result in changes to many ecosystems and the services they provide to society. Ocean Acidification: A National Strategy to Meet the Challenges of a Changing Ocean reviews the current state of knowledge, explores gaps in understanding, and identifi...
The Bare-toed Vaquero
Rarely visited by outsiders, the ranchers of the Sierra de la Giganta in Baja California Sur live much as their ancestors have for the past two centuries. They raise goats and cattle and grow a magnificent variety of fruits, vegetables, and flowers. In this book a gifted photojournalist introduces us to individual ranchers and their families and describes their traditional practices and the ways they have adapted to twenty-first-century challenges and technological advances. Marchand’s photographs and text are both informative and intimate. His introduction to this little-known corner of Mexico will delight travelers and scholars alike.
