ISSN:
1573-5117
Keywords:
stream ecosystems
;
periphyton
;
algae
;
primary production
;
freshets
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The effects of light and discharge on standing crops of periphyton in adjacent shaded and open reaches of first to fourth order streams were examined during winter in three streams of the Western Cascades, Oregon. Standing crops were measured in terms of chlorophylla and periphyton biomass at each site on 8 occasions. Open sites supported higher standing crops of periphyton than shaded sites and increases in standing crop were shown to be related to light input at each site. Biomass increased throughout winter until scouring associated with an unusually late winter freshet reduced periphyton standing crops to their lowest observed levels. It is concluded that periphyton levels are affected by a combination of factors of which light levels, and the periodicity of storm events are of major importance.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00008267
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