Spatio-temporal variation of periphyton biomass and accumulation in a temperate spring-fed stream |
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Authors: | Casey M Godwin Hunter J Carrick |
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Institution: | (1) School of Forest Resources, Pennsylvania State University, University Park, PA 16802, USA |
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Abstract: | Spatio-temporal variation of plant populations often can demonstrate synchronous patterns, particularly within highly connected
landscapes. Periphyton biomass (chlorophyll a) and net accumulation were measured at five sites in a spring-fed fourth-order stream located in central Pennsylvania with
a mixed land-uses watershed (Spring Creek, USA) to characterize longitudinal variation within the stream. Samples were collected
at three-week intervals over one year to describe seasonal patterns of periphyton biomass and net production (n = 17 per site). Spring Creek periphyton biomass and net accumulation increased dramatically from the headwaters to downstream
(range 10–1,000 mg/m2). The downstream reaches had exceptionally large algal biomass (chlorophyll a > 300 mg/m2) and potential for rapid turnover. Varying degrees of seasonality were observed among the sites, with upstream sites showing
more temporal variation but no distinct seasonal pattern. Despite this, large-scale disturbances within the watershed seem
to promote synchrony among sites throughout the stream as reflected by close correlations in chlorophyll values (Pearson correlation
coefficient r > 0.50). |
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Keywords: | Stream Periphyton Spatio-temporal variation Hurricane Ivan Chlorophyll a |
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