495 results — topic: Freshwater Ecology
Dataset for temporal influences on selenium partitioning, trophic transfer, and exposure in a major U.S. river
The trace element selenium is an essential element with a narrow window between concentrations needed to support life and those that cause toxicity to egg laying organisms. Selenium bioaccumulation in aquatic organisms is primarily the result of trophic transfer through food webs and is poorly predi
Beaver Re-introduction
Beaver can be important regulators of aquatic and terrestrial ecosystems, with effects far beyond their food and space requirements'. Beaver have the potential to modify stream morphology and hydrology by cutting significant amounts of wood and building dams. This in turn influences a variety of bio
Diel epibenthic activity of mayfly nymphs, and its non-concordance with behavioral drift
Facultative Metamorphosis in a Series of High Altitude Fossil Populations of Ambystoma tigrinum (Irvingtonian: Alamosa County, Colorado)
CHESSON, P. 1978. Predator-prey theory and variability. Ann. Rev. Ecol. Syst. 9:323-347. CURIO, E. 1976. The ethology of predation. Springer-Verlag, New York. DILL, L. M. 1983. Adaptive flexibility in the foraging behavior of fishes. Can. J. Fish. Aq. Sci. 40:398408. DUNBRACK, R. L., AND L. M. DILL.
An Artificial Key to the Aquatic Insects of Gunnison County, Colorado Streams above 2750 Elevation including chrironomid larvae from streams and ponds
Contaminants in Aquatic Ecosystems
A key to the aquatic insects of streams in the vicinity of the Rocky Mountain Biological Lab, including chironomid larvae from streams and ponds
The reservoir cytoskeleton and a possible cytostomal homologue in Colacium (Euglenophyceae)
ABSTRACTThe reservoir cytoskeleton of Colacium Ehrenberg is formed of three bands of microtubules. The microtubules of the dorsal band (DMT) become doublets and are continuous with the longitudinal microtubules of the canal and, therefore, of the pellicle. A band of para‐reservoir microtubules (PMT)
A cytostome/cytopharynx in green euglenoid flagellates (Euglenales) and its phylogenetic implications
The observations support the hypothesis that the phagotrophic euglenoids arose from a bondonid ancestor and gave rise to the phototrophs by chloroplast acquisition.
Do predaceous stoneflies and siltation affect the structure of stream insect communities colonizing enclosures?
Experiments in Colorado and New York streams assessed the effects of predaceous stoneflies on benthic invertebrate community establishment in enclosures providing uncolonized habitat. Aspects of prey community structure measured were density, species richness, relative species abundance, and body si
Acid precipitation and surface-water vulnerability on the western slope of the high Colorado Rockies
of low levels of molybdenum in the environment using aquatic insects
Observations on the emergence and habits of adults of Agnetina capitata and Acroneuria carolinensis (Plecoptera: Perlidae)
The quantification of stream drift
Although the purpose of many drift studies is to describe quantitatively the abundance of drifting invertebrates and make comparisons between seasons or sites, almost no investigations have employed replicate sampling. We analyzed drift collections from a Rocky Mountain stream in order to investigat