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Saturday, 30 December 2006 10:08
Saturday, 30 December 2006 10:01
Saturday, 30 December 2006 10:00
Saturday, 30 December 2006 09:51
As key components of freshwater (lake and river), estuarine and nearshore marine aquatic environments of the circumpolar north, Arctic char and related fishes of the genus Salvelinus are fundamental to the lifestyles and well-being of northerners as the basis for extensive fisheries conducted for household food (i.e., domestic and subsistence), commercial and sport purposes. Chars contribute significantly to household and wage economies, and social and cultural elements of northern life. Chars are also key integrators and indicators of the health of northern aquatic ecosystems, many aspects of which are at significant risk from increased climate variability and change. However, human adaptive responses are hampered by a lack of vital information regarding char thermal ecology, biodiversity and its functional significance in northern ecosystems, mercury and other pollutant interactions, and how these may respond to climate change.
Saturday, 30 December 2006 07:23
Saturday, 30 December 2006 06:21
Even though climate change is dramatically affecting the biosphere, our understanding of its effects on biological communities is poor. The Southern Ocean is an ideal natural laboratory to the impact of regional and global climate change because of the sensitive interactions between temperature, ice extent and species. Measuring variations in penguin populations can tell us a great deal about climate change, but could tell us even more if we understood the mechanisms the underlie the dynamics of penguin colonies. Taking advantage the major advances that have been made in microelectronics recently, this project will fit penguins with hugely powerful yet tiny state-of-the-art transponders and data recorders. The project will provide the first complete global and unified picture of penguin population dynamics, uncovering the processes that drive their numbers and the effects climate change is having on them.
Saturday, 30 December 2006 06:18
Saturday, 30 December 2006 06:07
POLENET will deploy an ambitious array of geophysical instruments across the polar regions in order to study the complex interplay between climate, ice sheets, geodynamics, and global sea level change. POLENET geodetic and seismic observations, paired with other types of geophysical measurements, will greatly improve our understanding of high latitude Earth systems. This international collaboration of 24 countries will involve scientists, students and educators at all levels, and will further advance our capability to deploy autonomous instruments in extreme environments
Saturday, 30 December 2006 06:01
The proposed activity aims at establishing a bipolar network to obtain data needed to quantify properties of aerosols at high latitudes, including seasonal background concentrations by measurements of aerosol optical depth (AOD), spectral characterizations, and the evolutionary patterns of the natural and anthropogenic processes that perturb the aerosol cycles. An effort to quantify direct and indirect climate forcing by polar aerosols will be made through a set of closure experiments using observations in conjunction with model calculation and satellite data.
Saturday, 30 December 2006 06:00
As human travel continues to increase, the impact of the non-native (alien) species that they often accidentally carry with them on ecosystems across the globe is becoming one of the major environmental challenges of the 21st Century. The impact of these alien species ranges from minor transient introductions to substantial loss of biodiversity and ecosystem changes. The Antarctic is not immune from the risk of invasive species, although to date impacts have been restricted to the milder sub-Antarctic islands. But as parts of the continent warm, it will become easier for non-native species to gain a foothold. It is also now easier for humans (and their unintended living cargo) to travel to and around the Antarctic than it ever has been, and many more people are doing so. Focusing on the annual migration of scientists and tourists to the Antarctic in 2007, this project will take samples from clothing and equipment to provide a unique snapshot of the number of spores, seeds, invertebrates and eggs transported to the continent: the first time that an assessment of the extent of transfer of alien species into an entire biome has ever been made.
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