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A cost-effective method to quantify biological surface sediment reworking

De Nadaï-Monoury, Eve and Lecerf, Antoine and Canal, Julie and Buisson, Laetitia and Laffaille, Pascal and Gilbert, Franck A cost-effective method to quantify biological surface sediment reworking. (2013) Hydrobiologia, 713 (1). 115-125. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1007/s10750-013-1497-6

Abstract

We propose a simple and inexpensive method to determine the rate and pattern of surface sediment reworking by benthic organisms. Unlike many existing methods commonly used in bioturbation studies, which usually require sediment sampling, our approach is fully non-destructive and is well suited for investigating non-cohesive fine sediments in streams and rivers. Optical tracer (e.g., luminophores or coloured sand) disappearance or appearance is assessed through time based on optical quantification of surfaces occupied by tracers. Data are used to calculate surface sediment reworking (SSR) coefficients depicting bioturbation intensities. Using this method, we evaluated reworking activity of stream organisms (three benthic invertebrates and a fish) in laboratory microcosms mimicking pool habitats or directly in the field within arenas set in depositional zones. Our method was sensitive enough to measure SSR as low as 0.2 cm2.d-1, such as triggered by intermediate density (774 m-2) of Gammarus fossarum (Amphipoda) in microcosms. In contrast, complex invertebrate community in the field and a fish (Barbatula barabatula) in laboratory microcosms were found to yield to excessively high SSR (>60 cm2.d-1). Lastly, we suggest that images acquired during experiments can be used for qualitative evaluation of species-specific effects on sediment distribution.

Item Type:Article
Additional Information: Thanks to SpringerLink editor. The definitive version is available at http://dx.doi.org/10.1007/s10750-013-1497-6
HAL Id:hal-00866569
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Franck Gilbert
Deposited On:26 Sep 2013 15:15

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