495 results — topic: Freshwater Ecology
Dissolved Oxygen and Temperature Data from the Hyporheic Zone of the East River Watershed July 2017 to October 2018
Dissolved oxygen (DO) is critical for aquatic ecosystems. Our focus is on the long-term DO dynamics in hyporheic zone of rivers, which are a function of both transport (hydrologic exchange between river and hyporheic zone) and uptake by biogeochemical reactions or respiration. The study site is the
Comparison of stonefly habitat on various sized rocks
A comparison of several lake eutrophication restorative techniques
The relationship between stream velocity and body size of Blephariceridae larvae - the net-winged midge
The effects of light intensity on the activity of predacious stonefly nymphs on mayfly nymphs
Does predation effect abundance and diversity of zooplankton in beaver ponds?
The influence of edge effects on aquatic invertebrate diversity in the streams of the East River Valley of Colorado
Seasonal movement patterns in a subalpine population of the tiger salamander, <i>Ambystoma tigrinum nebulosum</i>
Seasonal movements of a subalpine population of metamorphic tiger salamanders, Ambystoma tigrinum nebulosum, were explored from 1990 to 1992. Metamorphic adults bred in permanent and semipermanent habitats during June of each year. After breeding, soma individuals returned to the terrestrial environ
Evolution of Facultative Paedomorphosis in Salamanders
In some salamander species the retention of larval characteristics in sexually mature adults (paedomorphosis) is an alternative to metamorphosis. In many species paedomorphosis is facultative, thus offering a unique opportunity to test predictions on the evolution of life history variation. Here I e
Consequences and plasticity of the specialized predatory behavior of stream-dwelling stonefly larvae
The purpose of this study was to determine experimentally the potential mechanism(s) favoring specialized foraging behavior of stream—dwelling predatory stonefly larvae (Megarcys signata), and whether this specialized behavior was fixed or flexible. We measured stonefly growth rates after 10 d of co
Non-visual communication in freshwater benthos: an overview
This overview of non-visual communication in freshwater benthic animals emphasizes recent studies of the effect of chemical and mechanical signals on predator-prey interactions of benthic macroinvertebrates and amphibians. Prey species use chemical signals to modify their morphological development,
Diel feeding and positioning periodicity of a grazing mayfly in a trout stream and a fishless stream
We studied the feeding and positioning periodicity on natural substrates of the overwintering and fast-growing summer generations of a grazing mayfly, Baetis bicaudatus, in a third-order trout stream and a fishless, first-order tributary in western Colorado. At 4-h intervals over 24-h, we recorded t
The behavioral effects of intraspecific predation on larval tiger salamanders: an investigation of life history variation in montane populations of <i>Ambystoma tigrinum</i>
Use of macroinvertebrates to assess water quality at three sites along the East River
Organization of crustacean epizoan communities in a change of subalpine ponds
Planktivore effects on zooplankton epibiont communities: epibiont pigmentation effects
We observed the development of epibiont communities on freshwater crustacean zooplankton from 12 July–31 August 1991 in three ponds: one with planktivorous fish, a second with planktivorous larval salamanders, and a third with planktivorous fish added midway through the sampling period. Prevalence,
Colonization, interaction, and organization of cladoceran epibiont communities
The organization of zooplankton epibiont communities
This study examines the organization of communities whose populations are distributed among ephemeral habitat patches and the frequent molting of the crustacean exoskeleton keeps these epibiont populations in a state of constant renewal.
Foraging behavior of <i>Ambystoma tigrinum nebulosum</i>
An Integrated Wastewater Treatment and Reuse System to Enhance Wildlife and Other Estuarine Values
George H. Allen, Robert A. Gerheart, and John R. Williams. Western Association of Fish and Wildlife Agencies and Western Division of American Fisheries Society. ? ?