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Displaying 991 - 995 of 1195

Windy Commons

Journal Articles & Books
Décembre, 2010
États-Unis d'Amérique

Wind power generation is growing rapidly in the United States, doubling nearly every three years since 1998. Yet, wind is an open access resource, and past experiences with open access resources suggest that tragedies of the commons may occur. While the engineering literature has focused on turbine siting within a wind farm to maximize profits and minimize interaction effects, the economics literature has overlooked interaction effects between windfarms. We provide a qualitative framework for measuring wake externalities and use simulation modeling to determine their magnitude.

comparative assessment of land cover dynamics of three protected forest areas in tropical eastern Africa

Journal Articles & Books
Décembre, 2010
Ouganda
Kenya
Afrique
Afrique orientale

Processes of deforestation, known to threaten tropical forest biodiversity, have not yet been studied sufficiently in East Africa. To shed light on the patterns and causes of human influences on protected forest ecosystems, comparisons of different study areas regarding land cover dynamics and potential drivers are needed. We analyze the development of land cover since the early 1970s for three protected East African rainforests and their surrounding farmlands and assess the relationship between the observed changes in the context of the protection status of the forests.

influence of groundwater withdrawal and land use changes on brook charr (Salvelinus fontinalis) thermal habitat in two coldwater tributaries in Michigan, U.S.A

Journal Articles & Books
Décembre, 2010
États-Unis d'Amérique

Brook charr (Salvelinus fontinalis) is a sentinel fish species which requires clean, cold water habitats. As such, many jurisdictions in the United States where brook charr are present use this species as an indicator of ecosystem health. In Michigan, groundwater-dominated streams are currently being impacted by increased groundwater withdrawal and land use/land cover changes which alter stream temperatures and their flow, and thus have the potential to significantly influence brook charr production and behavior.

conceptual framework to analyse the land-use/land-cover changes and its impact on phytodiversity: a case study of North Andaman Islands, India

Journal Articles & Books
Décembre, 2010
Inde

Phytodiversity is affected both by natural and anthropogenic factors and in Island ecosystems these impacts can devastate or reduce diversity, if the native vegetation is lost. In addition to rich species richness and diversity, Island systems are the sites of high endemism and any threat to these ecosystems will consequently lead to loss and extinction of species.

Effects of land cover changes induced by large physical disturbances on hydrological responses in Central Taiwan

Journal Articles & Books
Décembre, 2010
Taiwan

This study analyzes the significant impacts of typhoons and earthquakes on land cover change and hydrological response. The occurrence of landslides following typhoons and earthquakes is a major indicator of natural disturbance. The hydrological response of the Chenyulan watershed to land use change was assessed from 1996 to 2005. Land use changes revealed by seven remote images corresponded to typhoons and a catastrophic earthquake in central Taiwan. Hydrological response is discussed as the change in quantities and statistical distributions of hydrological components.