Nutrient cycling in the epilithon of running waters

The development and physiology of microcommunities established on glass slides was investigated in the Matamek River, Quebec, during the summer of 1985. Microorganisms loosely attached to the substrate (overstory) and those strongly adhering to the substrate (understory) were considered separately. Community biomass accumulation resulted from increases in the overstory. Cell numbers remained relatively unchanged in the understory. As the community developed, the uptake of glucose, inorganic carbon, ammonia, and phosphate increased, mainly because of autotrophic organisms in the overstory. Organisms in the understory, especially bacteria, appeared to contribute significantly to the assimilation of glucose. The spiralling concept of nutrient reutilization in running waters was assessed in view of the changing physiology of the microorganisms comprising a developing biofilm. Release, downstream translocation, and subsequent biological assimilation of recently fixed bicarbonate, glucose, and orthophosphate wa...

[1]  J. Wilhm,et al.  USE OF ARTIFICIAL SUBSTRATA TO ESTIMATE THE PRODUCTIVITY OF PERIPHYTON1 , 1966 .

[2]  M. Bothwell,et al.  Photosynthetic characteristics of lotic periphyton , 1986 .

[3]  F. Fisher,et al.  ORGANIC COMPOUNDS RELEASED FROM A NATURAL POPULATION OF EPIBENTHIC BLUEGREEN ALGAE 1 , 1983 .

[4]  Timothy R. Parsons,et al.  A manual of chemical and biological methods for seawater analysis , 1984 .

[5]  A. Hershey,et al.  Transformation of a Tundra River from Heterotrophy to Autotrophy by Addition of Phosphorus , 1985, Science.

[6]  K. Sand‐Jensen.  Physical and chemical parameters regulating growth of periphytic communities , 1983 .

[7]  R. Mccoll.  Self‐purification of small freshwater streams: Phosphate, Nitrate, and Ammonia removal , 1974 .

[8]  H. Paerl.  Microbial organic carbon recovery in aquatic ecosystems1 , 1978 .

[9]  G. Geesey,et al.  Sessile bacteria: An important component of the microbial population in small mountain streams 1 , 1978 .

[10]  N. A. Griffith,et al.  Estimates of periphyton mass and stream bottom area using phosphorous-32 , 1969 .

[11]  M. Lock.  River Epilithon — A Light and Organic Energy Transducer , 1981 .

[12]  F. O. Howard,et al.  Organic Enrichment with Leaf Leachate in Experimental Lotic Ecosystems , 1972 .

[13]  B. Paul,et al.  PHYSIOLOGICAL MODIFICATIONS RELATED TO DENSITY INCREASE IN PERIPHYTIC ASSEMBLAGES 1 , 1987 .

[14]  J. Hiscox,et al.  A method for the extraction of chlorophyll from leaf tissue without maceration , 1979 .

[15]  T. Kairesalo.  COMPARISON OF IN SITU PHOTOSYNTHETIC ACTIVITY OF EPIPHYTIC, EPIPELIC AND PLANKTONIC ALGAL COMMUNITIES IN AN OLIGOTROPHIC LAKE, SOUTHERN FINLAND 1 , 1980 .

[16]  C. D. Mcintire,et al.  Periphyton Dynamics in Laboratory Streams: A Simulation Model and Its Implications , 1973 .

[17]  William H. McDowell,et al.  Elemental Dynamics in Streams , 1988, Journal of the North American Benthological Society.

[18]  F. Bärlocher,et al.  Dynamics of the Fungal Population on Leaves in a Stream , 1974 .

[19]  The role of microbes associated with organic and inorganic substrates in phosphorus spiralling in a woodland stream: With 3 figures and 1 table in the text , 1981 .

[20]  P. Hamilton,et al.  PERIPHYTON COLONIZATION OF ROCK SURFACES IN A BOREAL FOREST STREAM STUDIED BY SCANNING ELECTRON MICROSCOPY AND TRACK AUTORADIOGRAPHY 1 , 1984 .

[21]  P. J. Roos.  Dynamics of periphytic communities , 1983 .

[22]  A. Maurice,et al.  The fate of “dissolved” organic carbon derived from autumn‐shed maple leaves (Acer saccharum) in a temperate hard‐water stream1 , 1976 .

[23]  P. Wheeler.  USE OF METHYLAMMONIUM AS AN AMMONIUM ANALOGUE IN NITROGEN TRANSPORT AND ASSIMILATION STUDIES WITH CYCLOTELLA CRYPTICA (BACILLARIOPHYCEAE) 1 , 1980 .

[24]  R. Goulder.  SEASONAL VARIATiON IN HETEROTROPHIC ACTIVITY AND POPULATION DENSITY OF PLANKTONIC BACTERIA IN A CLEAN RIVER , 1980 .

[25]  C. Hudon,et al.  The Effect of Light on the Vertical Structure of Epibenthic Diatom Communities , 1983 .

[26]  D. Lean,et al.  Phosphate Exchange and Organic Phosphorus Excretion by Freshwater Algae , 1976 .

[27]  J. Kalff,et al.  Track autoradiography: A method for the determination of phytoplankton species productivity , 1976 .

[28]  B. Paul,et al.  An evaluation of the metabolism of sestonic and epilithic communities in running waters using an improved chamber technique , 1989 .

[29]  R. O'Neill,et al.  Measuring Nutrient Spiralling in Streams , 1981 .

[30]  R. Naiman.  Characteristics of Sediment and Organic Carbon Export from Pristine Boreal Forest Watersheds , 1982 .

[31]  J. Costerton,et al.  River epilithon: toward a structural-functional model , 1984 .

[32]  R. Weitzel,et al.  Sample Replication of Periphyton Collected from Artificial Substrates , 1979 .

[33]  A Method for the Analysis of Total Nitrogen in Natural Waters , 1984 .

[34]  P. Hamilton,et al.  Studies on periphyton community dynamics of acidic streams using track autoradiography , 1983 .

[35]  P. Harris,et al.  A method to detect metabolically-active microorganisms in leaf litter habitats , 1971 .