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Full-Text Articles in Life Sciences

Living On The Edge-Plants And Global Change In Continental And Maritime Antarctica, Sharon A. Robinson, J. Wasley, A. K. Tobin Dec 2003

Living On The Edge-Plants And Global Change In Continental And Maritime Antarctica, Sharon A. Robinson, J. Wasley, A. K. Tobin

Faculty of Science - Papers (Archive)

Antarctic terrestrial ecosystems experience some of the most extreme growth conditions on Earth and are characterised by extreme aridity and sub-zero temperatures. Antarctic vegetation is therefore at the physiological limits of survival and, as a consequence, even slight changes to growth conditions are likely to have a large impact, rendering Antarctic terrestrial communities sensitive to climate change. Climate change is predicted to affect the high latitude regions first and most severely. In recent decades, the Antarctic has undergone significant environmental change, including the largest increases in ultraviolet B (UV-B; 290-320nm) radiation levels in the world and, in the maritime region ...


How Rapidly Can Maternal Behavior Affecting Primary Sex Ratio Evolve In A Reptile With Environmental Sex Determination?, Carrie L. Morjan Aug 2003

How Rapidly Can Maternal Behavior Affecting Primary Sex Ratio Evolve In A Reptile With Environmental Sex Determination?, Carrie L. Morjan

Zoology and Genetics Publications

Theoretical models identify maternal behavior as critical for the maintenance and evolution of sex ratios in organisms with environmental sex determination (ESD). Maternal choice of nest site is generally thought to respond more rapidly to sex ratio selection than environmental sensitivity of offspring sex (threshold temperatures) in reptiles with temperature‐dependent sex determination (TSD, a form of ESD). However, knowledge of the evolutionary potential for either of these traits in a field setting is limited. I developed a simulation model using local climate data and observed levels of phenotypic variation for nest‐site choice and threshold temperatures in painted turtles ...


The Impacts Of Climate Change On Stream Flow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu Jul 2003

The Impacts Of Climate Change On Stream Flow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu

CARD Working Papers

We evaluate the impact of climate change on stream flow in the Upper Mississippi River Basin (UMRB) by using a regional climate model (RCM) coupled with a hydrologic model, the Soil and Water Assessment Tool (SWAT). The SWAT model was calibrated and validated against measured stream flow data using observed weather data and inputs from the Environmental Protection Agency’s BASINS (Better Assessment Science Integrating Point and Nonpoint Sources) geographical information/database system. The combined performance of the SWAT and RCM was examined using observed weather data as a lateral boundary condition in the RCM. The SWAT and RCM were ...


Evidence For Survival Of Pleistocene Climatic Changes In Northern Refugia By The Land Snail Trochoidea Geyeri, David Posada, Markus Pfenninger, Frederic Magnin Apr 2003

Evidence For Survival Of Pleistocene Climatic Changes In Northern Refugia By The Land Snail Trochoidea Geyeri, David Posada, Markus Pfenninger, Frederic Magnin

Faculty Publications

The study of organisms with restricted dispersal abilities and presence in the fossil record is particularly adequate to understand the impact of climate changes on the distribution and genetic structure of species. Trochoidea geyeri (Soos 1926) is a land snail restricted to a patchy, insular distribution in Germany and France. Fossil evidence suggests that current populations of T. geyeri are relicts of a much more widespread distribution during more favourable climatic periods in the Pleistocene. Results: Phylogeographic analysis of the mitochondrial 16S rDNA and nuclear ITS-1 sequence variation was used to infer the history of the remnant populations of T ...


The 'Ideal' Climate Change Ph.D. Program, Sheldon D. Drobot, David F. Porinchu, Krisa M. Arzayus, Valerie A. Barber, Lisa J. Delissio, L. Micaela Smith, Jeff M. Warren Jan 2003

The 'Ideal' Climate Change Ph.D. Program, Sheldon D. Drobot, David F. Porinchu, Krisa M. Arzayus, Valerie A. Barber, Lisa J. Delissio, L. Micaela Smith, Jeff M. Warren

Biology Faculty Publications

The training of the next generation of climate-change researchers is of utmost importance as climate change and its associated impacts take on increasing local, regional, and global relevance. This report seeks to address this issue by highlighting aspects of a successful climate-change Ph.D. program; a program which seeks to balance traditional disciplinary training with exposure to the broader, interdisciplinary climate-change community.