期刊
AQUATIC ECOLOGY
卷 42, 期 4, 页码 583-595出版社
SPRINGER
DOI: 10.1007/s10452-007-9133-z
关键词
Stream; Periphyton; Spatio-temporal variation; Hurricane Ivan; Chlorophyll a
资金
- United States Geological Survey [01-HQGR-00-99]
- US Environmental Protection Agency [IE060031]
Spatio-temporal variation of plant populations often can demonstrate synchronous patterns, particularly within highly connected landscapes. Periphyton biomass (chlorophyll alpha) 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 alpha > 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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