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Periphyton Production in an Appalachian Mountain Trout Stream
L. E. Hornick, J. R. Webster and E. F. Benfield
The American Midland Naturalist
Vol. 106, No. 1 (Jul., 1981), pp. 22-36
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2425132
Page Count: 15
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Periphyton primary production was investigated in a second-order Appalachian Mountain stream and two of its tributaries. Using 14C fixation in recirculating chambers, estimates averaged 2.27 mg C m-2 h-1 in the mainstream and 1.65 and 1.37 mg C m-2 h-1 in the two tributaries. Abiotic factors most influential on primary production rates were light, streamflow and inorganic carbon. Based on annual budgets, the estimated stream energy input attributable to autochthonous primary production was about 3% of allochthonous inputs. However, because of high nutritive value and timing, autochthony may be more important than indicated by annual budgets.
The American Midland Naturalist © 1981 The University of Notre Dame