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Displaying 1201 - 1205 of 1605Association of ant nests with successional stages of biological soil crusts in the Tengger Desert, Northern China
Biological soil crusts are important cover in arid desert landscapes, yet their importance as habitats to secondary producers such as ants is relatively unknown. This study was conducted to determine if the presence and development of biological soil crusts on dune surfaces stabilized by revegetation facilitates ant establishment and survival. We measured topsoil properties and crustal features during different successional stages, which were characterized by cyanobacteria and algae, lichens, and mosses, respectively.
Definition of the potential treeline in the European Alps and its benefit for sustainability monitoring
Sustainability indicator systems often use administrative entities as a reference, which may cause over- or underestimations of results within topographically different regions. Within the European Alps the highest impacts due to human activities are concentrated below the potential treeline, making these zones comparable to the potentially highly impacted surroundings of the European Alps. An application of the area below the potential treeline as a reference unit for sustainability indicators allows for a more equitable comparison of the European Alps and their surroundings.
Network analysis to assess landscape connectivity trends: Application to European forests (1990–2000)
Landscape networks and ecosystems worldwide are undergoing changes that may impact in different ways relevant ecological processes such as gene flow, pollination, or wildlife dispersal. A myriad of indices have been developed to characterize landscape patterns, but not all of them are equally suited to evaluate temporal changes in landscape connectivity as is increasingly needed for biodiversity monitoring and operational indicator delivery.
Solar chimneys integrated with sea water desalination
A new solar chimney power system with integration of sea water desalination has been introduced for the production of electricity and fresh water in this paper. Two mathematical models have been developed individually for a one-dimensional flow in solo solar chimney power system and this system. Through theoretical analysis, it has been demonstrated the integrated system can significantly improve the solar energy utilization efficiency as well as the land resources utilization efficiency, at the same time, the economic, social and ecological benefits can also be significant.
Grazing intensity is a poor indicator of waterborne Escherichia coli O157 activity
Contamination of watercourses with fecal matter represents a significant risk to public health due to the associated risk from human pathogens (e.g. Escherichia coli O157, norovirus). In addition, water contamination may also perpetuate the re-infection cycle of human pathogens within domesticated and wild animal populations. While diffuse pollution from agricultural fields has been identified as a major source of these pathogens, the relationship between livestock grazing intensity and subsequent pathogen persistence in water is not well established.