McGill University scientists have documented profound changes in lake ecosystems following the introduction of two exotic species, smallmouth bass and rock bass, into Canadian lakes. What's more, these changes may threaten native fish populations, particularly lake trout. In an upcoming article to be published in the prestigious journal Nature, Jake Vander Zanden and Joseph Rasmussen, together with a colleague from the Ontario Ministry of Natural Resources, John Casselman, report that when bass are introduced into lakes, they prey aggressively on smaller fish, forcing lake trout to shift to energetically-poor foods such as invertebrates. "Bass consume many of the food organisms that the lake trout depend on and greatly reduce their abundance," explains Rasmussen.
The above story is based on materials provided by McGill University. Note: Materials may be edited for content and length.
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