Changes in Lake Trout Population Dynamics Due to the Impact of Introduced Desirable Non-Native Salmonids.

Presentation Type

Oral and/or Visual Presentation

Presenter Major(s)

Natural Resource Management

Mentor Information

C. "Griff" Griffin, griffinc@gvsu.edu

Department

Biology

Location

Kirkhof Center 1104

Start Date

13-4-2011 2:30 PM

End Date

13-4-2011 3:00 PM

Keywords

Environment

Abstract

In the Great Lakes; population dynamics are changing due to introduction of desirable non-native salmonids such as rainbow trout, chinook and coho salmon. Length/age relationship data from the Ontario Ministry of Fisheries, Little River Band of Ottawa Indians and MDNRE, were analyzed to explore changes in lake trout population structure. Indicators of these changes include, slower growth rates, smaller age classes and lower individual frequency than water bodies where desirable non-native salmonids do not exist. A control lake was identified to explore lake trout populations that do not have to compete with desirable non-native salmonids. Cross examination of Lake Nipigon, the control lake, with trout populations from Lake Michigan and Lake Superior can provide better understanding of the impact non-native species introduction has had Great Lakes lake trout population structure.

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Apr 13th, 2:30 PM Apr 13th, 3:00 PM

Changes in Lake Trout Population Dynamics Due to the Impact of Introduced Desirable Non-Native Salmonids.

Kirkhof Center 1104

In the Great Lakes; population dynamics are changing due to introduction of desirable non-native salmonids such as rainbow trout, chinook and coho salmon. Length/age relationship data from the Ontario Ministry of Fisheries, Little River Band of Ottawa Indians and MDNRE, were analyzed to explore changes in lake trout population structure. Indicators of these changes include, slower growth rates, smaller age classes and lower individual frequency than water bodies where desirable non-native salmonids do not exist. A control lake was identified to explore lake trout populations that do not have to compete with desirable non-native salmonids. Cross examination of Lake Nipigon, the control lake, with trout populations from Lake Michigan and Lake Superior can provide better understanding of the impact non-native species introduction has had Great Lakes lake trout population structure.