Abstract
Sediment-reworking macrofauna can stimulate nitrification by increasing the O2 penetration into sediments or it can reduce nitrification by grazing on nitrifying bacteria. We investigated the influence of Chironomus riparius larvae (Insecta: Diptera) on the in situ activity, abundance, and distribution of NH +4 -oxidizing (AOB) and NO −2 -oxidizing bacteria (NOB) in two freshwater sediments with microsensors and fluorescence in situ hybridization. In organic-poor sediment, nitrification activity was reduced by the presence of C. riparius larvae, whereas no such effect was detected in organic-rich sediment. We explain this difference with the variable larval burrowing and grazing behavior in the two sediment types: In organic-poor sediment larval activities were intense and evenly distributed across the whole sediment surface, whereas in organic-rich sediment larval activities were locally restricted to the microenvironment of animal burrows. Surprisingly, the animals did not cause any significant change of the abundance of AOB and NOB. This implies that the observed reduction of nitrification activity was not density-regulated, but rather was due to the lowered metabolic activity of the nitrifiers. Partial digestion and redeposition of particle-associated bacteria by C. riparius larvae are believed to have caused this loss of metabolic activity.
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Acknowledgments
We thank Enrique Llobet-Brossa and Armin Gieseke for their advice and helpful comments regarding FISH in sediments. Gabi Eickert, Anja Eggers, and Ines Schröder are acknowledged for the construction of O2 microelectrodes. For critical comments on the paper we thank Rebecca Ludwig and Armin Gieseke. For statistical advice we are grateful to Werner Wosniok (University of Bremen). Financial support was provided by the German Research Foundation (STI202/1-2), and by the Max Planck Society, Germany.
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Altmann, D., Stief, P., Amann, R. et al. Nitrification in Freshwater Sediments as Influenced by Insect Larvae: Quantification by Microsensors and Fluorescence in Situ Hybridization. Microb Ecol 48, 145–153 (2004). https://doi.org/10.1007/s00248-003-2015-6
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DOI: https://doi.org/10.1007/s00248-003-2015-6