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**The impact of flash floods on microbial distribution and biogeochemistry in the parafluvial zone of a desert stream** by Robert M. Holmes; Stuart G. Fisher; Nancy B. Grimm; Bryan J. Harper is a Environmental Science article available to read on EtoBox.

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## Summary 1. The impact of flash flooding on microbial distribution and biogeochemistry was investigated in the parafluvial zone (the part of the active channel lateral to the surface stream) of Sycamore Creek, a Sonoran Desert stream in central Arizona. 2. It was hypothesized that subsurface bacteria were dependent on the import of algal‐derived organic matter from the surface stream, and it was therefore predicted that microbial numbers and rates of microbially mediated processes would be highest at locations of surface to subsurface hydrologic exchange and at times when algal biomass was high. 3. Prior to a flash flood on 19 July 1994, chlorophyll __a__ was high (≈ 400 mg m^–2^) in the surface stream and microbial numbers were highest at the stream–parafluvial interface and declined along parafluvial flowpaths, supporting the hypothesized algal–bacterial linkage. Immediately following the flash flood, chlorophyll __a__ was low (≈ 7 mg m^–2^), and microbial numbers were reduced at the stream–parafluvial interface. 4. Counter to expectations, parafluvial functioning (in terms of nitrate production and dissolved oxygen decline along flowpaths) re‐established immediately after the

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Author

Robert M. Holmes; Stuart G. Fisher; Nancy B. Grimm; Bryan J. Harper

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0046-5070)

Published

1998

Language

EN

Field

Environmental Science (Physical Sciences)