Publisher's Synopsis
Excerpt from Effects of Regulated Lake Levels on Muskrats in Voyageurs National Park, Minnesota
Before the dams were built, natural annual fluctuations were probably meters throughout this chain of lakes (flug Currently, Rainy Lake water levels fluctuate one meter annually (minimal drawdown), while Namakan Reservoir fluctuates approximately meters (flug The significant drawdown in Namakan Reservoir occurs during winter with progressive declines continuing through February and March (fig. Food sources of the muskrat, including cattail (typha burreed (sparganium sedges (carex grass (gramineae), smartweed (polygonum horsetail (eguisetum bulrush (soir us, and wild rice (zizania aguatica), are left dry and frozen at the harshest time of year. Water rises quickly in late April and May when northern muskrats are having their first litters of the year (errington 1963; Willner et al. The highest water levels are maintained from June through September. Flug (1986) estimated that natural water fluctuations in Namakan Reservoir would have less amplitude, with highest water in June and lowest water throughout the fall and winter (fig. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.