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Scientific Investigations Report 2010–5255

Prepared in cooperation with the International Joint Commission,
International St. Croix River Watershed Board

A Digital Terrain Model of Bathymetry and Shallow-Zone Bottom-Substrate Classification for Spednic Lake and Estimates of Lake-Level-Dependent Habitat to Support Smallmouth Bass Persistence Modeling

By Robert W. Dudley, Charles W. Schalk, Nicholas W. Stasulis, and Joan G. Trial

ABSTRACT

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In 2009, the U.S. Geological Survey entered into a cooperative agreement with the International Joint Commission, St. Croix River Board to do an analysis of historical smallmouth bass habitat as a function of lake level for Spednic Lake in an effort to quantify the effects, if any, of historical lake-level management and meteorological conditions (from 1970 to 2009) on smallmouth bass year-class failure. The analysis requires estimating habitat availability as a function of lake level during spawning periods from 1970 to 2009, which is documented in this report. Field work was done from October 19 to 23, and from November 2 to 10, 2009, to acquire acoustic bathymetric (depth) data and acoustic data indicating the character of the surficial lake-bottom sediments. Historical lake-level data during smallmouth bass spawning (May-June) were applied to the bathymetric and surficial-sediment type data sets to produce annual historic estimates of smallmouth-bass-spawning-habitat area. Results show that minimum lake level during the spawning period explained most of the variability (R2 = 0.89) in available spawning habitat for nearshore areas of shallow slope (less than 10 degrees) on the basis of linear correlation. The change in lake level during the spawning period explained most of the variability (R2 = 0.90) in available spawning habitat for areas of steeper slopes (10 to 40 degrees) on the basis of linear correlation. The next step in modeling historic smallmouth bass year-class persistence is to combine this analysis of the effects of lake-level management on habitat availability with meteorological conditions.

First posted March 4, 2011

For additional information contact:
Director
U.S. Geological Survey
Maine Water Science Center
196 Whitten Road
Augusta, Maine 04330
(207)622-8201

http://me.water.usgs.gov/

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Suggested citation:

Dudley, R.W., Schalk, C.W., Stasulis, N.W., and Trial, J.G., 2011, A digital terrain model of bathymetry and shallow-zone bottom-substrate classification for Spednic Lake and estimates of lake-level-dependent habitat to support smallmouth bass persistence modeling: U.S. Geological Survey Scientific Investigations Report 2010–5255, 18 p., at http://pubs.usgs.gov/sir/2010/5255/.


Contents

Abstract

Introduction

Purpose and Scope

Description of Spednic Lake

Hydrography

Surficial Geology

Climate

Methods of Study

Data Collection

Post-Processing of Echosounder Data

Post-Processing of ADCP Data

GIS Construction of the Digital Terrain Model of Bathymetry

Interpretation of Bottom-Substrate Types

Bathymetry and Shallow-Zone Bottom-Substrate Classification for Spednic Lake and Estimates of Lake-Level-Dependent Habitat

References Cited


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