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Displaying 1216 - 1220 of 1605Are Swiss birds tracking climate change? Detecting elevational shifts using response curve shapes
Climate change is affecting biodiversity worldwide inducing species to either “move, adapt or die”. In this paper we propose a conceptual framework for analysing range shifts, namely a catalogue of the possible patterns of change in the distribution of a species along elevational or other environmental gradients and an improved quantitative methodology to identify and objectively describe these patterns.
Validation of modeled carbon-dioxide emissions from an urban neighborhood with direct eddy-covariance measurements
Modeled carbon-dioxide (CO₂) emissions from an urban area are validated against direct eddy-covariance flux measurements. Detailed maps of modeled local carbon-dioxide emissions for a 4 km² residential neighborhood in Vancouver, BC, Canada are produced. Inputs to the emission model include urban object classifications (buildings, trees, land-cover) automatically derived from Light Detection and Ranging (LiDAR) and optical remote sensing in combination with census, assessment, traffic and measured radiation and climate data.
Grazing intensity monitoring in Northern China steppe: Integrating CENTURY model and MODIS data
Steppe, an important belt to protect North China from dust storms, is vulnerable and has been degraded in recent decades because of climatic change and heavy grazing. In order to improve steppe management, this study presents a framework for the monitoring of grazing intensity in Xilingol steppe of middle Inner Mongolia, northern China, by integrating the CENTURY ecosystem model-based simulation and remotely sensed MODIS data-based inversion.
Impact of urbanization and agriculture on the occurrence of bacterial pathogens and stx genes in coastal waterbodies of central California
Fecal pollution enters coastal waters through multiple routes, many of which originate from land-based activities. Runoff from pervious and impervious land surfaces transports pollutants from land to sea and can cause impairment of coastal ocean waters. To understand how land use practices and water characteristics influence concentrations of fecal indicator bacteria (FIB) and pathogens in natural waters, fourteen coastal streams, rivers, and tidal lagoons, surrounded by variable land use and animal densities, were sampled every six weeks over two years (2008 & 2009).
social and environmental challenges faced by goat and small livestock local activities: Present contribution of research-development and stakes for the future
Small livestock (goats, sheep, llamas, camels…) like other agricultural activities could have to face dramatic social, economical and environmental challenges. These challenges are identified underlining that these activities are often important and well present in countries with low incomes or in less favored areas. Although they are often low input production systems with lower environmental impacts, they face desertification and less water availability, genetic erosion, soil degradation and degradation of rangelands, competitions for land use.