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Type: Journal article
Title: Changes in abiotic and biotic phosphorus uptake across a gadient of stream condition
Author: Aldridge, K.
Brookes, J.
Ganf, G.
Citation: River Research and Applications: an international journal devoted to river research and management, 2010; 26(5):636-649
Publisher: John Wiley & Sons Ltd
Issue Date: 2010
ISSN: 1535-1459
Statement of
Kane T. Aldridge, Justin D. Brookes and George G. Ganf
Abstract: Degraded streams have been shown to retain fewer nutrients than un-modified streams. The aim of this project was to investigate the relative importance of abiotic and biotic pathways of phosphorus uptake by epilithic communities in un-modified and modified streams. This was investigated through a series of filterable reactive phosphorus (FRP)-uptake experiments in two streams of the Torrens River Catchment, South Australia. Total benthic FRP uptake was assessed as the loss of FRP to unsterilized epilithic communities (kT), abiotic uptake was the loss to sterilized epilithic communities (kA) and biotic uptake (kB) was the difference between total and abiotic uptake. It was hypothesized that un-modified reaches would have higher kA and kB than degraded and engineered reaches. Overall, kT, kA and kB were greatest in un-modified reaches, but this pattern was not consistent across seasons. kT and kB were greatest in the un-modified reaches in autumn winter and late spring, but not in winterspring. Differences in kB were best explained by phosphorus availability in the water column and the period of continuous flow. kAwas greatest in the un-modified reaches in autumn-winter, greatest in the degraded reaches in winter-spring, but similar in the un-modified reaches and degraded reaches in late spring. kA was most dependent upon the background FRP concentration, but also the attached organic matter in the un-modified reaches. he project demonstrated that several impacts of changes in land-use can alter the affinity of biotic and abiotic processes for phosphorus, which will have implications for in-stream nutrient availability and downstream ecosystems. © 2009 John Wiley & Sons, Ltd.
Keywords: Stream
epilithic community
Rights: Copyright © 2009 John Wiley & Sons, Ltd.
DOI: 10.1002/rra.1276
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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