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1 March 2007 Cotton strips as a leaf surrogate to measure decomposition in river floodplain habitats
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Leaf-litter assays have advanced understanding of decomposition processes in both terrestrial and aquatic ecosystems. Some shortcomings inherent in the technique may be overcome through use of a cotton-strip assay. Key assumptions for using cotton strips as proxies for natural leaves are: 1) decomposition rates of the 2 materials are related, and 2) the materials decay in a similar way when exposed to the same environmental conditions. These assumptions were tested by comparing cotton-strip decomposition (loss of tensile strength and mass) and leaf decomposition (mass loss) across different floodplain habitats of the Tagliamento River (northeastern Italy). Patterns of loss of cotton-strip tensile strength and leaf mass were broadly comparable across river channels, ponds, and terrestrial sites. Differences between river channels and ponds were greater for loss of cotton-strip tensile strength than leaf mass, indicating that, in some situations, loss of cotton-strip tensile strength may be more sensitive to differing environmental conditions than loss of leaf mass. Loss of cotton-strip mass was less sensitive than loss of either tensile strength or leaf mass. Although combined data from all floodplain sites and additional sites in Swiss streams yielded a curvilinear relationship between loss of cotton-strip tensile strength and mass, the slope was extremely steep in the range of 20 to 30% mass loss (corresponding to 0 to 95% loss in tensile strength), indicating that inferring one variable from the other is unreliable. Leaf mass loss was significantly correlated with loss of tensile strength in fine- and coarse-mesh bags in ponds and in coarse-mesh bags in terrestrial sites. However, these correlations were relatively weak (r = 0.50–0.63), suggesting that loss of tensile strength did not accurately reflect leaf mass loss. Thus, the cotton-strip assay should not be used uncritically as a surrogate for leaf-litter assays, but it has potential as a standardized method to measure organic-matter decomposition in fluvial settings and as a functional indicator for stream assessment.

S. D. Tiegs, S. D. Langhans, K. Tockner, and M. O. Gessner "Cotton strips as a leaf surrogate to measure decomposition in river floodplain habitats," Journal of the North American Benthological Society 26(1), 70-77, (1 March 2007).[70:CSAALS]2.0.CO;2
Received: 20 February 2006; Accepted: 26 September 2006; Published: 1 March 2007

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