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Composition and structure of macroinvertebrate communities in contrasting open-water habitats in Irish peatlands: implications for biodiversity conservation

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Abstract

The purpose of this study was to consider the relative importance of several habitat variables in explaining the patterns in the structure of macroinvertebrate assemblages in open-water habitats, in relatively intact bogs and fens, which should inform conservation strategies. It was hypothesised that variables relating to the size of the water body would differentiate the communities and that some species would be unique to certain conditions. The macroinvertebrate communities from pools >100 m2, 10.1–100 m2 and Sphagnum hollows were characterised using sweep sampling for eight intact peatland sites across four bog types, and related to habitat variables including pool size, Sphagnum cover and hydrochemistry. Results showed community composition and structure differed significantly between deep, permanent pools and shallow, drought-sensitive Sphagnum hollows, with larger invertebrates, such as Odonates and Dytiscinae, rarely found in the hollows. Sphagnum cover accounted for a substantial amount of the variation in community composition. An examination of life-history strategies found species dependent on predictable conditions for juvenile development to be more abundant in pools. In contrast, taxa that could delay juvenile development until conditions were favourable were more abundant in Sphagnum hollows. These results highlight the importance of habitat heterogeneity in maintaining macroinvertebrate diversity in peatlands.

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Acknowledgments

The authors would like to thank the EPA for funding this work and Dr. Florence Renou-Wilson, Dr. Rachel Wisdom and Dr. Louise Deering for their help throughout the project. They would also like to thank Dr. J. P. O’Connor in the Natural History Museum for validating trichopteran identifications.

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Authors and Affiliations

  1. Freshwater Biodiversity, Ecology and Fisheries Research Group, School of Biology and Environmental Science, Science Centre West, University College Dublin, Belfield, Dublin 4, Ireland

    Edel Hannigan & Mary Kelly-Quinn

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  1. Edel Hannigan
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  2. Mary Kelly-Quinn
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Correspondence to Edel Hannigan.

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Guest editor: Chris B. Joyce / Wetland services and management

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Hannigan, E., Kelly-Quinn, M. Composition and structure of macroinvertebrate communities in contrasting open-water habitats in Irish peatlands: implications for biodiversity conservation. Hydrobiologia 692, 19–28 (2012). https://doi.org/10.1007/s10750-012-1090-4

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  • DOI: https://doi.org/10.1007/s10750-012-1090-4

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