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1. Changes in species composition of the periphyton on introduced substrates were determined in an oiigotrophic mountain stream subject to long-term heavy metal contamination.2. At the upstream control site, the numerically most abundant taxa were Bacillariophyta {Achnanthes minutissima, Achnanthes microcephala and Achnanthes linearis) as well as, in summer, the Chlorophyta (Mougeotia spp. and Ulothrix subtilissima).3. At the downstream contaminated site the periphyton community was totally dominated by Bacillariophyta throughout the sampling period. A. minutissima and A. microcephala were co-dominants during spring. Seasonal succession patterns did not parallel those at the upstream site. Chlorophyta were virtually absent and A. minutissima comprised 94% of the community during summer.4. Species diversity, species evenness and dissimilarity index were utilized to delect differences in species composition, abundance and number. Slight differences were found in spring samples while summer samples indicated major differences between sampling sites.

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GARLAND: We at Industrial Biotechnology are interested in exploring a broad range of biobased industries, and in this Roundtable Discussion bring together leaders in the field of what we're calling "on-site biotechnological applications." This would be distinct from other kinds of green building applications that might involve biotechnology such as offsite production of biobased materials.What we'd like to talk about today is the application of systems that involve microorganisms, plants, animals, or combinations thereof for a specific purpose within, or perhaps on, the building. This is an expansion of what people have done for a long time with onsite treatment of wastewater using septic tanks and drain fields. But there have been many developments in the field of on-site wastewater treatment. Advanced systems (ranging from multiple trophic-level ecosystems, to small-footprint membrane bioreactors, an example of the latter being the Zenon technology that GE has commercialized) are becoming increasingly common for treatment and recycling of water onsite.In addition, there have been developments in the use of ecological systems on site beyond wastewater treatment. Some of our panel members today are involved with systems that treat air inside buildings, or that provide multiple benefits, as is the case with green roofs.

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