North Temperate Lakes Long Term Ecological Research studies the ecology of lakes as one of a network of sites established by the National Science Foundation. We are interested in how biophysical setting, climate, and changing land use and cover interact to shape lake characteristics and dynamics over time (past, present, future).
Our primary study sites include a set of seven northern Wisconsin and four southern Wisconsin lakes and their surrounding landscapes. The project, which started in 1981, is administered by the Center for Limnology at the University of Wisconsin-Madison.
At the North Temperate Lakes LTER site, we have observed cyclic dynamics in a population of yellow perch in oligotrophic Crystal Lake. Since 1981, we have observed 3 cases of cohort dominance in which two age-classes dominated the population for roughly 5 years. Across years, the presence of young-of-the-year fish was negatively related to juvenile perch abundance and positively related to adult perch abundance. Conclusions drawn from a statistical dynamic linear model suggest that oscillations in young-of-the-year perch abundance were intrinsically driven by the positive effect of adult perch reproduction and the negative effect of juvenile perch via cannibalism and competition ....
This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-0822700, NTL LTER. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.