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Displaying 931 - 935 of 1195

Large herbivores may alter vegetation structure of semi-arid savannas through soil nutrient mediation

Journal Articles & Books
декабря, 2011

In savannas, the tree-grass balance is governed by water, nutrients, fire and herbivory, and their interactions. We studied the hypothesis that herbivores indirectly affect vegetation structure by changing the availability of soil nutrients, which, in turn, alters the competition between trees and grasses. Nine abandoned livestock holding-pen areas (kraals), enriched by dung and urine, were contrasted with nearby control sites in a semi-arid savanna.

Influence of exurban development on bird species richness and diversity

Journal Articles & Books
декабря, 2011
United States of America

Exurban development is an accelerating land use trend in the United States with new housing units emerging in formerly closed forests. Conservation practitioners and planners suspect exurban development alters ecological processes and biodiversity to a considerable larger extent than suspected by inhabitants of exurban development areas, but empirical support for this assertion is lacking.

National Inventory of Landscapes in Sweden (NILS)--scope, design, and experiences from establishing a multiscale biodiversity monitoring system

Journal Articles & Books
декабря, 2011
Sweden

The landscape-level and multiscale biodiversity monitoring program National Inventory of Landscapes in Sweden (NILS) was launched in 2003. NILS is conducted as a sample-based stratified inventory that acquires data across several spatial scales, which is accomplished by combining aerial photo interpretation with field inventory. A total of 631 sample units are distributed across the land base of Sweden, of which 20% are surveyed each year. By 2007 NILS completed the first 5-year inventory phase.

influence of watershed characteristics on nitrogen export to and marine fate in Hood Canal, Washington, USA

Journal Articles & Books
декабря, 2011
United States of America

Hood Canal, Washington, USA, is a poorly ventilated fjord-like sub-basin of Puget Sound that commonly experiences hypoxia. This study examined the influence of watershed soils, vegetation, physical features, and population density on nitrogen (N) export to Hood Canal from 43 tributaries. We also linked our watershed study to the estuary using a salinity mass balance model that calculated the relative magnitude of N loading to Hood Canal from watershed, direct precipitation, and marine sources.

Jefferson’s moral agrarianism: poetic fiction or normative vision?

Journal Articles & Books
декабря, 2011

Scholars today are divided on the motivation behind what is often called Jefferson’s “moral agrarianism”. On the one hand, some scholars take Jefferson at his word when he mentions that agrarianism is a moral vision. For these individuals, Jefferson’s agrarianism is a moral vision and an indispensible part of the good life. On the other hand, other scholars maintain that Jefferson’s moral agrarianism is merely a bit of propaganda that insidiously sheaths a political or economic ideal.