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EFFECTS OF INTRODUCED FISH ON MOUNTAIN LAKE ZOOPLANKTON COMMUNITIES Open Access

Descriptions

Other title
MOUNTAIN LAKE ZOOPLANKTON
Subject/Keyword
Rockies
Climate
Mountain
Fish
Introduced
Lake
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Messner, Jordan S
Supervisor and department
Vinebrooke, Rolf (Biological Sciences)
Examining committee member and department
Foote, Lee (Renewable Resources)
Schindler, Dave (Biological Sciences)
Tonn, Bill (Biological Sciences)
Department
Department of Biological Sciences
Specialization
Ecology
Date accepted
2012-01-09T15:01:23Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
Decades of fish introductions into mountain lakes have altered invertebrate communities. I assessed the current status of fish populations and their effects on crustacean zooplankton communities by sampling 37 lakes in the mountain parks, where stocking practices had been halted over 25 years ago. I discovered that introduced fish were more likely to persist in colder alpine lakes than in montane sites. However, their effects on total zooplankton biomass and species diversity increased with rising lake temperatures. Persistence of introduced fish in warmer lakes favored small-bodied zooplankton species, whereas larger-bodied communities in colder, larger alpine lakes were relatively unaffected. Greater resistance and resilience (i.e. recovery rate) of alpine zooplankton (e.g. Hesperodiaptomus arcticus) in deeper, fish-stocked lakes was likely attributable to a greater availability of refuge from predators and more abundant diapausing egg banks. Fish residence time and the species of stocked fish were key factors of taxonomic stability in perturbed zooplankton communities.
Language
English
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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