SS3.10 Ecological Implications of Terrestrial Inputs into Lakes and Ponds
Date: Tuesday, June 11, 2002
Time: 4:45:00 PM
Location: Esquimalt
 
BozekM, Wisconsin Cooperative Fishery Research Unit, Univ of Wisconsin, Stevens Point, USA, mbozek@uwsp.edu
Achuff, B, , Wisconsin Cooperative Fishery Research Unit, Univ of Wisconsin, Stevens Point, USA, bachu114@uwsp.edu
Newbrey, M, , Wisconsin Cooperative Fishery Research Unit, Univ of Wisconsin, Stevens Point, USA, mnewb203@uwsp.edu
Cook, J, , College of Natural Resources, Univ of Wisconsin, Stevens Point, USA, jcook@uwsp.edu
 
A DYNAMIC MODEL LINKING RIPARIAN AREA TREE RECRUITMENT TO SUBMERGED WOODY HABITAT IN LAKES
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Dynamic processes affect the sustained recruitment of trees to lakes and its use as habitat for fish. The objective of this study is to develop a model that integrates riparian forest dynamics with the recruitment of wood to lakes, the rate of wood decay, and use of wood by fish. We surveyed the riparian area and littoral zone around Katherine Lake, WI. Data was collected on 1) the composition of the riparian forest including: age, species, height, DBH, slope, and disease, 2) branching complexity and decomposition of coarse woody structure (CWS) in adjacent littoral areas, and 3) fish use of this CWS as habitat by fish. Katherine Lake has a northern mixed hardwood forest riparian area with limited development and variable amounts of wood in adjacent littoral areas. Canonical correlation and linear regression showed the complexity of CWS was linked to several riparian forest characteristics including species composition, size, age, and other variables. Seventeen species of fish used CWS as habitat in Katherine Lake and regression analyses showed that nine species of fish were significantly related to complexity of branching. Rates of tree recruitment, CWS decomposition, and use by fish are being integrated to create a dynamic model to predict how to maintain sustainable recruitment of complex woody habitat under various riparian conditions.