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Effects of experimental warming, litter species, and presence of macroinvertebrates on litter decomposition and associated decomposers in a temperate mountain stream

Ferreira, Verónica and Chauvet, Eric and Canhoto, Cristina Effects of experimental warming, litter species, and presence of macroinvertebrates on litter decomposition and associated decomposers in a temperate mountain stream. (2014) Canadian Journal of Fisheries and Aquatic Sciences, 72 (2). 206-216. ISSN 0706-652X

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Official URL: http://dx.doi.org/10.1139/cjfas-2014-0119

Abstract

Small woodland streams make the majority of water courses in most watersheds. Litter decomposition is a key ecosystem process in these shaded streams, and its response to warming can have profound consequences for food webs and the carbon (C) cycle. However, these responses can be modulated by litter identity and the structure of the detrital food web. Here we report on a manipulative study aiming at evaluating the effects of warming (+2.8 °C), litter identity (chestnut (Castanea sativa) or oak (Quercus robur) litter), and the structure of the detrital food web (presence or absence of macroinvertebrates) on litter decomposition and decomposers in a small, temperate woodland stream. Warming significantly stimulated overall (microbial- + macroinvertebrate-driven) decomposition of oak and microbial-driven decomposition of chestnut. The similar shredder densities at elevated and ambient temperatures suggest that stimulated overall decomposition of oak resulted from increased activity of macroinvertebrate individuals. Stimulated microbial-driven decomposition of chestnut resulted from higher fungal activity with warming. Stimulation of litter decomposition by warming can lead to increases in the amount of C returned to the atmosphere and to a faster disappearance of litter from the benthos, with consequences to the C cycle and aquatic food webs.

Item Type:Article
Additional Information:Thanks to NRC Research Press. The definitive version is available at http://www.nrcresearchpress.com The original PDF of the article can be found at NRC Research Press website : www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2014-0119#.VS5yzBCeN30
HAL Id:hal-01142859
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Universidade de Coimbra (PORTUGAL)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
IMAR–CMA - FEDER European Funds - Program Operational Factors of Competitiveness (COMPETE) - Portuguese Science and Technology Foundation - French EC2CO (Continental and Coastal Ecosphere) CNRS program - FCT - Pessoa exchange program between Portugal and France (PHC 22808TB) from the French Ministry of Foreign and European Affairs
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Deposited By: Eric Chauvet
Deposited On:16 Apr 2015 09:12

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