After decades of strict pollution control and municipal sewage treatment, the water quality of the Tanshui River increased significantly after pollution mitigation as indicated by the River Pollution Index (RPI). The pollution level of the estuarine region decreased from severe pollution to mostly moderately impaired. The most polluted waters are presently restricted to a flow track length betw...

Effects of gizzard shad Dorosoma cepedianum on benthic communities in a large southern reservoir (Lake Texoma, U.S.A.) were examined during two field enclosure and exclosure experiments in which enclosures were stocked at high and low densities in 1998 and 1999, respectively. In both years, chironomid abundance significantly increased in treatments that excluded large fishes from foraging on se...

This research was developed between 1993 and 1996, aiming to study the structure of the benthic macroinvertebrate community, relating it to some abiotic variables, in an amazonian lake (lago Batata), that received for ten years a great amount of bauxite tailings. The benthic macroinvertebrates were collected with a core and the abiotic variables that were measured were: dissolved oxygen, suspen...

Forest wetlands are biodiversity hotspots that perform functions of vital ecological importance, but they among the world's most threatened ecosystems. Due to their high diversity habitats and species, study benthic macroinvertebrate communities is challenging, there no consensus on which sampling methods allow a better representation these communities. Here we compared performance 3 (hand net,...

In North America, disturbed riparian zones have had a deleterious effect on the life cycles of anadromous fish, especially commercially and culturally important salmon steelhead. The result has been significant reduction in numbers average size these fish. Tributaries John Day River are spawning waters for western populations National Forest Service Confederated Tribes Umatilla Indian Reservati...