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Morphometric Evaluation Of The Whitefish Complex In Bear Lake, Utah/Idaho, Alan Ward

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Whitefish populations around the world have long been difficult to categorize taxonomically. The whitefish of Bear Lake, Utah/Idaho are no exception. There are three recognized species of Prosopium that are endemic to the lake. Two of these species, Prosopium spilonotus and Prosopium abyssicota, have previously been indistinguishable outside of spawning times. Previous studies have proposed additional taxa within P. spi/onotus to further complicate the identification among these taxa.

Morphological characteristics were quantified on wild whitefish from Bear Lake, as well as from progeny reared in the laboratory from the wild adult fish. The purported taxa were separated in the field …

Aspects Of The Feeding Ecology Of The Bonneville Cisco Of Bear Lake, Utah-Idaho, David C. Lentz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Bonneville cisco (Prospium gemmiferum), a small planktivorous whitefish, is an important part of the distinctive fish community of Bear Lake, Utah-Idaho. The Bonneville cisco plays a key role in the trophic structure by converting zooplankton to fish biomass and providing a major forage source for cutthroat and lake trout. Aspects of cisco feeding ecology studied include characterization of the zooplankton community composition and dynamics and cisco feeding habits and prey selection.

Composition and seasonal dynamics of the zooplankton community were determined for a fifteen month period during 1981-1982. The community was dominated by a calanoid copepod, Epischura …

An Ecological Study Of The Bear Lake Littoral Zone, Utah-Idaho, Gar W. Workman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In the past, several projects have been conducted at Bear Lake, Utah-Idaho, by the Utah State University through the Wildlife Resources Department, in conjunction with the Utah and Idaho fish and game departments, the Fish and Wildlife Service , and the National Science Foundation. These projects have dealt primarily with limnology, limnological techniques, fish life histories, fish movements, and bottom fauna in the pelagic and benthic areas of the lake. Subsequently, a littoral zone project was set up to study some of the ecological aspects of the shallow waters of Bear Lake, and some of the influences that this area …