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Effects of intense agricultural practices on heterotrophic processes in streams

Piscart, Christophe and Genoel, Romuald and Doledec, Sylvain and Chauvet, Eric and Marmonier, Pierre Effects of intense agricultural practices on heterotrophic processes in streams. (2009) Environmental Pollution, 157 (3). 1011-1018. ISSN 0269-7491

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.envpol.2008.10.010


In developed countries, changes in agriculture practices have greatly accelerated the degradation of the landscape and the functioning of adjacent aquatic ecosystems. Such alteration can in turn impair the services provided by aquatic ecosystems, namely the decomposition of organic matter, a key process in most small streams. To study this alteration, we recorded three measures of heterotrophic activity corresponding to microbial hydrolasic activity (FDA hydrolysis) and leaf litter breakdown rates with (kc) and without invertebrates (kf) along a gradient of contrasted agricultural pressures. Hydrolasic activity and kf reflect local/microhabitat conditions (i.e. nutrient concentrations and organic matter content of the sediment) but not land use while kc reflects land-use conditions. kc, which is positively correlated with the biomass of Gammaridae, significantly decreased with increasing agricultural pressure, contrary to the taxonomic richness and biomass of Trichoptera and Plecoptera. Gammaridae may thus be considered a key species for organic matter recycling in agriculture-impacted streams.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF can be found at Environmental Pollution website: http://www.sciencedirect.com/science/article/pii/S0269749108005241
HAL Id:hal-00870740
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 - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
Laboratory name:
Deposited On:08 Oct 2013 07:06

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