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Displaying 856 - 860 of 1195

restricted range of the Ethiopian Bush-crow Zavattariornis stresemanni is a consequence of high reliance on modified habitats within narrow climatic limits

Journal Articles & Books
Décembre, 2012
Éthiopie
Afrique

We attempt to describe and explain the peculiarly restricted distribution of the globally threatened Ethiopian Bush-crow Zavattariornis stresemanni. At a regional scale, models containing only correlates of land cover suggested a far wider distribution of suitable habitat in north-east Africa than the area actually occupied. However, models including only climate variables predicted the known distribution almost perfectly, and suggested that the species’ area of occupancy is delimited by a pocket of climate that is cooler, dryer and more seasonal than surrounding areas.

Modeling the radiation balance of different urban underlying surfaces

Journal Articles & Books
Décembre, 2012

An urban net all-wave radiation parameterization scheme is evaluated using annual datasets for 2010 recorded at a Beijing urban observation site. The statistical relationship between observed data and simulation data of net radiation has a correlation coefficient of 0.98 and model efficiency of 0.93. Therefore, it can be used to simulate the radiation balance of Beijing. This study analyzes the variation in the radiation balance for different underlying surfaces. To simulate radiation balance differences, we set four pure land-cover types (forest, grass, roads, and buildings).

Threatened access, risk of eviction and forest degradation: case study of sustainability problem in a remote rural region in India

Journal Articles & Books
Décembre, 2012
Inde

Degradation of common pool resource (CPR) in developing countries has often been traced to high rate attached by poor people in discounting future flow of benefits, market failure, pressure on carrying capacity or sometimes property right failure. However, the concept of poorly enforced property right and particularly risk of eviction as a measure of insecurity of land tenure has not been adequately examined in the context of degradation of CPR.

Including CO2 implications of land occupation in LCAs—method and example for livestock products

Journal Articles & Books
Décembre, 2012
Brésil

PURPOSE: Until recently, life cycle assessments (LCAs) have only addressed the direct greenhouse gas emissions along a process chain, but ignored the CO2 emissions of land-use. However, for agricultural products, these emissions can be substantial. Here, we present a new methodology for including the implications of land occupation for CO2 emissions to realistically reflect the consequences of consumers’ decisions.

Use and Economic Value of Manna grass (Glyceria) in Poland from the Middle Ages to the Twentieth Century

Journal Articles & Books
Décembre, 2012
Pologne
Ukraine
Lituanie
Bélarus

Manna grass (mainly but not exclusively G. fluitans) used to be widely gathered in most lowland areas of the present territory of Poland and western and southern Belarus. It had an important function as a component of tribute paid to local landowners by villagers, which led to the persistence of manna gathering even when this was not sustainable for peasants themselves. Manna grass was always an expensive food due to its time consuming gathering, but appreciated for its sweet taste and often served as dessert.