The relationship of floods, drying, flow and light to primary production and producer biomass in a prairie stream
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Factors related to autochthonous production were investigated at several sites along a prairie stream at Konza Prairie Research Natural Area. Primary production, algal biomass, litter input, and ability of floods to move native substrate were measured. Additional experiments were conducted to establish the influence of light and water velocity on primary production rates and recovery of biomass following dry periods. The study period encompassed two extreme (> 50 year calculated return time) floods, thus we were able to analyze the effects of scour on periphyton biomass and productivity. Biomass of sedimentary algae was reduced greatly by flooding and did not reach preflood amounts during the 2 months following the first flood. Rates of primary production associated with sediments recovered to levels above preflood rates within 2 weeks. Biomass of epilithic periphyton was not affected as severely as that of sedimentary algae. Little relationship was observed between water velocity and photosythetic rates. Production reached maximum rates at 25% of full sun light. Epilithic chlorophyll levels recovered within eight days following a dry period, and chl a was an order of magnitude greater on rocks than sediments 51 days after re-wetting. Estimated annual rates of primary production were 2.6 times greater in the prairie than in the forest reaches of the stream. The ratio of annual autochthonous:allochthonous carbon input was 4.81 for prairie and 0.32 for the forest. Periphyton production in prairie streams is resilient with regard to flooding and drought and represents a primary carbon source for the system.
Key wordsperiphyton flood primary production autochthonous light water velocity
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- APHA, 1989. Standard Methods for the Examination of Water and Wastewater, 17th edn. American Public Health Association, Washington D.C.Google Scholar
- Clement, R. W., 1987. Floods in Kansas and techniques for estimating their magnitude and frequency on unregulated streams. United States Geological Survey, Water-Resources Investigations Report 87–4008, 50 pp.Google Scholar
- Fisher, S. G. & N. B. Grimm, 1988. Disturbance as a determinant of structure in a Sonoran Desert stream ecosystem. Verh. Int. Ver. Theor. Angewandte Limnol. 23: 1183–1189.Google Scholar
- Hooker, K. L., 1987. Factors affecting the nitrate removal potential of sediments from a tallgrass prairie stream. PhD dissertation, Kansas State University, Manhattan, KS, 107 pp.Google Scholar
- Knight, C. L., J. M. Briggs & M. D. Nellis, 1994. Expansion of gallery forest on Konza Prairie Research Natural Area, Kansas, USA. Landscape Ecol. 9: 117–125.Google Scholar
- McBrayer, J. F. & K. Cromack, Jr., 1980. Effect of snow pack on lake-litter breakdown and nutrient release in a Minnesota forest. Pedobiologia 20: 47–54.Google Scholar
- Peterson, C. G. & R. J. Stevenson, 1990. Post-spate development of epilithic algal communities in different current environments. Can. J. Bot. 68: 2092–2102.Google Scholar
- Tate, C. M. & M. E. Gurtz, 1986. Comparison of mass loss, nutrients, and invertebrates associated with elm leaf litter decomposition in perennial and intermittent reaches of tallgrass prairie streams. Southwest. Nat. 31: 511–520.Google Scholar
- Wetzel, R. G. & G. E. Likens, 1991. Limnological Analysis, 2nd edition. Springer-Verlag, New York.Google Scholar
- Whittaker, R. H., 1975. Communities and Ecosystems, 2nd edition. Macmillan Publishing Co., New York.Google Scholar