495 results — topic: Freshwater Ecology
Data from: Lifetime fitness, sex-specific life history, and the maintenance of a polyphenism
Polyphenisms, alternative morphs produced through plasticity, can reveal the evolutionary and ecological processes that initiate and maintain diversity within populations. We examined lifetime fitness consequences of two morphs in a polyphenic population of Arizona Tiger Salamanders using a 27-year
Chubs in the Tub: Colorado's Native Aquatic Species Restoration Facility
Colorado Division of Wildlife. 2003.
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important in situ technique, a conclusive analysis of in situ data to determine the References density dependence of emigration and CORKUM, L. D. 1978.The influence of density and immigration of benthic stream inverte-behavioural type on the active entry of two mayfly species (Ephemeroptera) into th
Embryological induction and predation ecology in Daphnia pulex
Results of laboratory experiments suggest that a water‐soluble factor released into the environment by the predacious phantom midge larva Chaoborus americanus (Diptera: Chaoboridae) causes embryos of the waterflea Daphnia pulex Leydig 1860 emend. Richard 1896 (Crustacea: Cladocera) to develop into a
Morphological variation of Daphnia pulex Leydig (Crustacea: Cladocera) and related species from North America
The data support either the view that the D. pulex species group is one widespread and variable species, or that it is comprised of a much larger number of species than presently recognized.
Determinants of diet of brook trout (<i>Salvelinus fontinalis</i>) in a mountain stream
Feeding rates, time of feeding, and prey choice of brook trout (Salvelinus fontinalis) were studied in Cement Creek, Colorado, in 1975–77. On each of five dates from early June to late September, I collected trout at intervals over a 24-h period, along with samples of invertebrate drift and benthos.
A comparative study of primary productivity in two ponds
Primary production in pond ecosystems
An analysis of the species diversity and total number of bethic invertebrates above and below the Keystone Mine effluent
Interactions between larval amphibians
Some observations on the distribution of amphibian larvae in the vicinity of Gothic, Colorado
A brief study of <i>Limnephilus</i> feeding and leaf pack colonization
Aquatic primary production
Primary production in two ponds: a comparison
A study of the attached algae of streams and ponds in the area of Gothic, Colorado
Proposed new identification character for the genus Colacium (Euglenophyceae)
An experimental analysis of biological factors contributing to stream community structure
Densities of invertebrates were manipulated within stony substrate filled cages in a Wisconsin and a Colorado stream to test the effects of prey densities on colonizaiton of the cages by invertebrate predators and potential competitors. There was no difference between the number of predators coloniz
Do stonefly predators influence benthic distributions in streams?
Experimental manipulations were conducted within the substrate of a Wisconsin stream and a Colorado stream to measure the effect of stonefly predators on the distribution of benthic invertebrates. Screen cages containing free predators, predators restricted from foraging, or no predators, allowed pr
Predator-prey interactions between stoneflies and mayflies: behavioral observations
Field experiments were conducted at two streams to determine the mechanisms by which mayfly prey detect and avoid stonefly predators, and to quantify the effect of stonefly predators upon mayfly behavior, distribution, and activity levels. Direct observations of the interactions between stoneflies a
Influence of detritus upon colonization of stream invertebrates
The effect of introduced detritus on the colonization of cages by benthic invertebrates within the substrate of two stony streams was examined. Pairs of substrate-filled screen cages were buried to a depth of 10–20 cm within the substrate of Otter Creek, Sauk County, Wisconsin, and the East River, G