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Title of Journal: Hydrobiologia

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Abbravation: Hydrobiologia

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Springer International Publishing

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DOI

10.1007/bf01463161

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ISSN

1573-5117

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Influence of aperiodic summer droughts on leaf lit

Authors: Maurizio Pinna Gabriele Marini Giovanni Cristiano Luca Mazzotta Patrizia Vignini Bruno Cicolani Antonio Di Sabatino
Publish Date: 2016/06/09
Volume: 782, Issue: 1, Pages: 111-126
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Abstract

Climate changes geomorphologic modifications and the rise in water demand for human uses contribute to “aperiodic summer drought” ASD events in Mediterraneantype rivers ASD results in a reach that flows in one summer dries in next or more summers and then flowing again The ecological structure and function of streams affected by ASD are understudied especially with respect to permanent and regular intermittent streams We tested the drying memory in a reach of Aterno River Italy disturbed by ASD Leaf litter breakdown of Phragmites australis and macroinvertebrate assemblages were studied Discharge was monitored since 2006 The experiment was performed during summer 2010 using the litterbag technique and was replicated four times The disturbed site was affected by drought in the three previous summers while the control was always flowing Taxonomic diversity indices abundance and structure of macroinvertebrate assemblages varied significantly between sites Instead leaf litter breakdown wasn’t influenced by ASD Therefore ASD events seem to affect the structure of macroinvertebrate assemblages confirming the role of drying memory of the systems The resilience of leaf litter breakdown in reach affected by ASD seems to be high probably depending on the activity of selected microbial communities and macroinvertebrate features like metabolism and biomassThe present research was supported by ex60 funds Italian MIUR attributed to M Pinna The postdoc Grant of G Marini was supported by Fishes in Reefs Project European Fish Funds 2007–2013 The PhD Grant of L Mazzotta was supported by BIOforIU Project Italian MIUR PON Research and Competitiveness 2007–2013 The authors are grateful to S Janzen for language revision and to anonymous reviewers for their helpful comments to previous draft

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