Influences of water and substrate quality for periphyton in a montane stream affected by acid mine drainage

Article Abstract:

Influences of substrate quality and water on periphyton in a montane stream where acid mine drainage has an effect have been studied at St. Kevin Gulch, a Rocky Mountain headwater stream in Colorado. In the acid mine drainage are high concentrations of heavy metals and high rates of metal hydroxide deposition. It appears that the metal hydroxides have effects on periphyton that vary by hydroxide type. When the mine drainage was diverted, the pH increased and in the second year aluminum hydroxides precipitated from the water, which inhibited growth of all periphyton, Ulothrix included.

United States, Mining industry, Rocky Mountains, Water acidification, Acid water pollution, Aluminum hydroxide

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Fecal pellets from a dense aggregation of suspension-feeders in a stream: an example of ecosystem engineering

Article Abstract:

A high density of blackfly larvae was associated with an increase in the numbers of fecal pellets in suspension downstream. The blackfly larvae have low efficiency of assimilation and they alter the size of organic matter, as they take in fine particles and dissolved matter from suspension and egest fecal pellets that are much larger. The pellets that settle become available to the benthic microbes and invertebrates.

Organic wastes, Benthos, Benthic zone, Larvae, Blackfly

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Methane input and evasion in a hardwood forest stream: effects of subsurface flow from shallow and deep pathways

Article Abstract:

Variations in groundwater concentration and subsurface discharge were associated with variations in methane concentration and evasion in stream sections of Walker Branch in east Tennessee, a hardwood forest stream. Methane in streams appears to come primarily from subsurface flow from riparian soils, although deeper bedrock flow also contributes a lower concentration of methane to surface waters.

Methane, Forest ecology, Hardwoods, Hardwood (Wood product)

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