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The role of the freshwater shrimp Atyaephyra desmarestii in leaf litter breakdown in streams

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Abstract

In aquatic ecosystems, microorganisms and invertebrates provide critical links between plant detritus and higher trophic levels. Atyaephyra desmarestii is an omnivorous decapod that inhabits freshwaters and exhibits high tolerance to temperature oscillations and high ability to colonize new habitats. Although A. desmarestii is able to ingest a variety of foods, few studies have been conducted to elucidate the role of this freshwater shrimp on detritus breakdown in streams. In this study, A. desmarestii was allowed to feed on conditioned or unconditioned alder and eucalyptus leaves in microcosms with or without access to its fecal pellets. At the end of the experiment, total body length of the animals was measured, and the remaining leaves and fecal pellets were used for dry mass quantification and assessment of bacterial and fungal diversity by denaturing gradient gel electrophoresis (DGGE). Cluster analyses of DGGE fingerprints indicated that the major differences in microbial communities on leaves were between leaf types, while on fecal pellets were between conditioned and unconditioned leaves. However, the consumption rate by the shrimp did not differ between leaf types, and was significantly higher on leaves conditioned by microorganisms and in treatments without access to feces. In treatments without access to feces, the production of feces and fine particulate organic matter was also significantly higher for conditioned leaves. Overall, our results support the feeding plasticity of A. desmarestii and its potential role in plant litter breakdown in streams. This might have implications for maintaining stream ecosystem functioning, particularly if more vulnerable shredders decline.

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Acknowledgments

The Portuguese Foundation for the Science and Technology supported S. Duarte (SFRH/BPD/47574/2008).

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Authors and Affiliations

  1. Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Braga, Portugal

    Sofia Duarte, Cláudia Pascoal & Fernanda Cássio

  2. Centre for Marine and Environmental Research (CIIMAR), Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal

    Maria Leonor Fidalgo

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  1. Sofia Duarte
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  2. Maria Leonor Fidalgo
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  3. Cláudia Pascoal
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  4. Fernanda Cássio
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Correspondence to Fernanda Cássio.

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Handling editor: Núria Bonada

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Duarte, S., Fidalgo, M.L., Pascoal, C. et al. The role of the freshwater shrimp Atyaephyra desmarestii in leaf litter breakdown in streams. Hydrobiologia 680, 149–157 (2012). https://doi.org/10.1007/s10750-011-0912-0

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  • DOI: https://doi.org/10.1007/s10750-011-0912-0

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