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Population Dynamics and Trophic Ecology of Northern Pike and Smallmouth Bass in Coeur d'Alene Lake: Implications for the Conservation of Westslope Cutthroat Trout

Citation

Walrath, John David. (2013). Population Dynamics and Trophic Ecology of Northern Pike and Smallmouth Bass in Coeur d'Alene Lake: Implications for the Conservation of Westslope Cutthroat Trout. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/walrath_idaho_0089m_10095.html

Title:
Population Dynamics and Trophic Ecology of Northern Pike and Smallmouth Bass in Coeur d'Alene Lake: Implications for the Conservation of Westslope Cutthroat Trout
Author:
Walrath, John David
Date:
2013
Keywords:
northern pike population dynamics predation smallmouth bass trophic ecology westslope cutthroat trout
Program:
Natural Resources
Subject Category:
Fisheries and aquatic sciences
Abstract:

Adfluvial Westslope Cutthroat Trout Oncorhynchus clarkii lewisi populations have declined significantly since the 1900s in Coeur d'Alene Lake, Idaho. The Coeur d'Alene Tribe has an intense Passive Integrated Transponder (PIT) tagging program and has reported poor juvenile to adult return rates, which is hypothesized to be a result of predation by nonnative species, such as Northern Pike Esox lucius and Smallmouth Bass Micropterus dolomieu. Sampling occurred on 138 days and 15,645 individual fishes representing 24 species were captured. The population structure and dynamics of Northern Pike and Smallmouth Bass were similar across sampling locations. After pooling data for Coeur d'Alene Lake, growth of Northern Pike and Smallmouth Bass was compared using meta-analysis to other populations across their distributions. The potential effect of predation by Northern Pike on Westslope Cutthroat Trout was evaluated with bioenergetics modeling. Northern Pike (i.e., 2008-2011 year classes) consume an estimated 5,641 Westslope Cutthroat Trout annually from the four sampling locations (i.e., Cougar, Wolf Lodge, Windy bays, Benewah Lake) in Coeur d'Alene Lake.

Description:
masters, M.S., Natural Resources -- University of Idaho - College of Graduate Studies, 2013
Major Professor:
Quist, Michael C
Committee:
Wilhelm, Frank M; Wiest, Michelle M
Defense Date:
2013
Identifier:
Walrath_idaho_0089M_10095
Type:
Text
Format Original:
PDF
Format:
application/pdf

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