Alison Smith

Species distributions in response to environmental gradients in the Upper Midwest of the United States - an example using the Neotoma database part of Neotoma:Teaching Activities
Pollen and ostracode records are used here to examine the migration of a major ecotone (transition zone between two biomes) in the Northern Midwest known as the prairie-forest border. Using the Neotoma database, we can explore the modern geographic distribution of prairie and forest vegetation (represented by pollen data) and of saline and freshwater lakes (represented by ostracodes, microscopic aquatic crustaceans) and then track the shifting boundary of the prairie forest border over the most recent 12,000 years using a lake sediment core.