Advanced search

Gretchen Hansen

University of Wisconsin
Center for Limnology
680 North Park Street
Madison, WI 53706
ghansen2@wisc.edu
(608) 263-2465
http://limnology.wisc.edu/personnel/jakevz/hansen.html

Research Projects

Invasive Crayfish Trapping

Can an ecosystem dominated by an invasive species be forced into an alternate stable state of low invader abundance? Invasive rusty crayfish (Orconectes rusticus) adversely affect native biota when present at high densities; however, at low densities their effects are minimal.  Lakes with high and low densities of rusty crayfish may represent alternate stable states, meaning that crayfish at low densities could be maintained ...

Lakelevel Effects on Invaded Lake Ecosystems

How do lake levels affect invaded ecosystems in northern Wisconsin? Lake levels in northern Wisconsin are currently at historic lows, and climate models predict this trend to continue.  Lowered lake levels affect littoral habitats and associated communities; however specific effects on native and invasive species are poorly understood ...

more

Selected Datasets

Biocomplexity; Whole Lake Manipulations: Aquatic Macrophytes
Biocomplexity; Whole Lake Manipulations: Exotic Crayfish Removal
Food Web Isotope Study in North Temperate Lake
Native and invasive species abundance distributions
more