Results 211 to 220 of about 22,317 (250)

Overwintering of Freshwater Benthic Macroinvertebrates

1991
Although temperature has long been recognized as a key variable in aquatic ecosystems, the consequences of freezing have received relatively little attention. At high elevations and latitudes, ice formation is a major variable affecting differential survival of organisms and hence the abundance and community composition of freshwater organisms. Ice may
Mark W. Oswood, L. Keith Miller, John G. Irons   +2 more
openaire   +1 more source

Acute bioassays with benthic macroinvertebrates conducted in situ

Bulletin of Environmental Contamination and Toxicology, 1989
Several methods of toxicity testing using macroinvertebrates in controlled laboratory experiments have been reported. Researchers conducted bioassays with natural assemblages of benthic macroinvertebrates exposed to several petroleum refinery effluents. They found that the populations of invertebrates declined after only a few days of exposure.
M, Whaley, R, Garcia, J, Sy
openaire   +2 more sources

A Method for Tagging Individual Benthic Macroinvertebrates

Journal of the North American Benthological Society, 1989
An inexpensive and reliable method for marking individual benthic macroinvertebrates was developed using hand-crafted 2 × 3-mm plastic tags attached with readily available cyanoacrylate instant glue. Pteronarcys stoneflies retained tags for 6 mo in a circular laboratory stream tank, and up to 81 d under field conditions in a turbulent Rocky Mountain ...
openaire   +1 more source

Effects of Diflubenzuron on Benthic Macroinvertebrates in Littoral Enclosures

Archives of Environmental Contamination and Toxicology, 1996
Two applications of the insect growth regulator diflubenzuron were made to replicate littoral enclosures at nominal concentrations of 0.7, 2.5, 7.0, and 30 &mgr;g/L. Assessment of the effects of this insecticide on benthic macroinvertebrate community structure was accomplished by measuring changes in abundance and taxonomic richness.
, O'Halloran, , Liber, , Schmude, , Corry   +3 more
openaire   +2 more sources

Responses of stream benthic macroinvertebrates to fire

Forest Ecology and Management, 2003
Synthesis of published research on the responses of stream benthic macroinvertebrates to fire in western United States indicates a consistent pattern of response that can guide resource management and future research. Direct effects of fire generally are minor or indiscernible.
openaire   +1 more source

Variation between Technicians Sorting Benthic Macroinvertebrate Samples

Freshwater Invertebrate Biology, 1984
After identification and enumeration, specimens sorted from 18 benthic macroinvertebrate samples by two technicians were returned to corresponding sample residue. Unknown to technicians, the samples were remixed and relabeled with new collection dates and then sorted as if newly collected. By chance, 13 samples were sorted by both technicians.
openaire   +1 more source

Benthic Macroinvertebrates

1992
  +4 more sources

Freshwater Biomonitoring and Benthic Macroinvertebrates

The Journal of Applied Ecology, 1994
D. M. Harper, D. A. Rosenberg, V. H. Resh   +2 more
openaire   +1 more source

Benthic macroinvertebrates (Chironomidae, Oligochaeta) in Italian lakes

2009
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Rossaro B.(1), Marziali L.(2), Boggero A., Lencioni V.(3)   +3 more
openaire   +1 more source

Benthic Macroinvertebrates

2001
openaire   +2 more sources