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Aquatic Sciences

, Volume 76, Issue 2, pp 155–163 | Cite as

Effect of experimental and seasonal warming on litter decomposition in a temperate stream

  • Verónica Ferreira
  • Cristina Canhoto
Research Article

Abstract

Litter decomposition, a fundamental ecosystem process in woodland streams, is potentially affected by the predicted increase in water temperature. Here, we assessed the effects of experimental and seasonal warming on oak litter decomposition and on the relative contributions of microbes and invertebrates to this process. Experimental warming (~3 °C) stimulated litter decomposition in the coldest, but not in the warmest, months. This may be attributed to (1) higher temperature sensitivity of decomposition at lower ambient temperature due to temperature limitation of enzymatic activity, (2) higher relative temperature increase in winter than in warmer months, (3) existence of a previous warming period in winter, and (4) stronger stimulation of the activity of detritivores by warming in winter due to the prevalence of earlier (smaller) instars than in warmer months. The low response of litter decomposition to warming may have been due to the low nutrient availability in the study stream. The 30-day litter decomposition was stimulated over the seasonal gradient (monthly mean temperature: 6–16 °C), which may be attributed to a stimulation of metabolic activities by warming and to changes in detritivore life history over the seasons. The stimulation of litter decomposition with temperature suggests that the rate of CO2 release from freshwaters will increase under global warming. However, invertebrate-driven litter decomposition was more responsive to warming than microbial-driven litter decomposition, suggesting that a larger fraction of litter carbon may be converted into secondary production and stored in the system for longer periods.

Keywords

Aquatic invertebrates Aquatic microbes Climate change Ecosystem functioning Experimental warming Litter decomposition 

Notes

Acknowledgments

We thank Elsa Rodrigues and Cristina Docal for the ion chromatography analyses, Ana Lírio and João Rosa for valuable help in the field, and Felix Bärlocher for revising the English. We also thank the Company Amado & Amado Lda., Coimbra, Portugal, for help in the construction of the heating tanks and setup of the system in the stream and the Municipality of Lousã, Portugal, for their support and help in the setup of the hydraulic infrastructure and warming facilities. This study was partially financed by the Institute of Marine Research (IMAR), the European Fund for Economic and Regional Development (FEDER) through the Program Operational Factors of Competitiveness (COMPETE), and National Funds through the Portuguese Foundation of Science and Technology (FCT) under the project “Predicting the effect of global warming on stream ecosystems” (PTDC/CLI/67180/2006; FCOMP-01-0124-FEDER-007112). Financial support granted by the FCT to VF (SFRH/BPD/34368/2006 and SFRH/BPD/76482/2011, program POPH/FSE) is gratefully acknowledged.

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Copyright information

© Springer Basel 2013

Authors and Affiliations

  1. 1.IMAR-CMA, Department of Life SciencesUniversity of CoimbraCoimbraPortugal

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