Browse by Archive
DigitalCommons@USU
|
A multi-year experiment in which zooplankton species were manipulated in 12 ponds indicated that the presence of the carnivorous copepod Heterocope septentrionalis eliminated Daphnia pulex whenever H. septentrionalis became established. In...
2011-01-01
|
|
In glaciated mountains, lakes are interspersed through watersheds and connected by streams. Although lakes or streams are frequently studied as individual water bodies, studying them as integrated functional units provides considerable insight on...
2005-01-01
|
|
The growth rates of rainbow trout, Salmo gairdneri, which ranged in size from 0.6 to 5.2 g and were provided rations of three different sizes, were measured during a 15-day study. The relative maintenance rations (food/gram of fish at zero growth...
1977-01-01
|
|
1. After Chaoborus flavicans became established in 1974, the species composition of zooplankton in Lake Lenore changed. Diaptomus nevadensis disappeared and densities of Diaptomus siciliswere reduced.
2. A transplant experiment showed the D....
1987-01-01
|
|
Rainbow trout (Oncorhynchus mykiss [Walbaum]) in Castle Lake, California were concentrated at certain depths during day and evening hours. A fish bioenergetics simulation model based on vertical gradients of temperature, oxygen concentration, and...
1994-01-01
|
|
The current recovery strategy for threatened Snake River Chinook salmon Oncorhynchus tshawytscha relies heavily on improvements to the quality of freshwater spawning and rearing habitat; however, the potential survival benefit from these actions...
2004-01-01
|
|
This study evaluates the effect of different nitrogen fertilization regimes in an American sycamore (Platanus occidentalis L.) plantation on tree growth, fertilizer recovery by the trees, and nitrate leaching from the soil with the objective of...
1994-01-01
|
|
The location of a stream reach relative to other landforms in a watershed is an important attribute. We hypothesized that lakes disrupt the frequency of finer, more mobile sediments and thereby change sediment transport processes such that benthic...
2007-01-01
|
|
In the Great Salt Lake of Utah, the brine shrimp Artemia franciscanaKellogg is an important food resource for birds and they produce dormant cysts that are harvested and used extensively in the aquaculture industry.We analyzed the limnological...
2001-01-01
|
|
Personnel from Utah State University, working in cooperation with the Utah Division of Wildlife Resources and the Utah Cooperative Fish and Wildlife Research Unit, are attempting to determine various sources of mortality of fingerling rainbow...
1987-01-01
|
|
We tested the hypotheses that benthic macroinvertebrates, especially chironomid larvae in the Tribe Chironomini, from small oligotrophic arctic lakes are only weakly linked to pelagic food sources, and that they are trophically linked to biogenic...
2006-01-01
|
|
The effects of constant temperatures (10, 15, 20, 25, 30, and 35 C) and ration size on the growth rates and activity of juvenile mosquitofish Gambusia affinis (mean wet weight, about 20 mg) were measured in laboratory experiments. On ad libitum...
1983-01-01
|
