A Nutrient Loading Model for Lake Winnipeg to estimate the impacts of various nutrient management strategies.
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Date
2008
Authors
Page, S.J.
Hesslein, R.
McCullough, G.
Stainton, M.
Journal Title
Journal ISSN
Volume Title
Publisher
Freshwater Institute, Department of Fisheries and Oceans
Abstract
Over the past few decades, scientists have observed signifi cant
changes in the state of Lake Winnipeg, which has in turn spawned
an environmental awareness for many Manitobans and Canadians.
Since the 1990s, algal blooms on this great lake have increased
in size, frequency and intensity: a threatening indicator of a
deteriorating ecosystem. While these algal blooms have often
been linked to increased human activities in the watershed (e.g.
municipal sewage, septic fi elds, industrial discharge, livestock
manure, agriculture, urban runoff) , climate related events may
be having a more signifi cant and pressing infl uence on their
occurrence and extent .
We employ a STELLA based nutrient loading model which simulates
lake nutrient concentrations (carbon, nitrogen and phosphorus)
from 1913 to 2006 based on historical river inputs. In addition,
we then use the same model to predict future lake concentrations
based on various fl ow regimes as well as to estimate the impact
of various proposed nutrient management strategies
Description
Keywords
nutrient loading, Lake Winnipeg, nutrient management, Stella Model