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Recovery of benthic macroinvertebrate and adult dragonfly assemblages in response to large scale removal of riparian invasive alien trees

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Abstract

Invasive alien organisms can impact adversely on indigenous biodiversity, while riparian invasive alien trees (IATs), through shading of the habitat, can be a key threat to stream invertebrates. We ask here whether stream fauna can recover when the key threat of riparian IATs is removed. Specifically, we address whether IAT invasion, and subsequent IAT removal, changes benthic macroinvertebrate and adult dragonfly assemblages, for the worse or for the better respectively. Natural riparian zones were controls. There were statistically significant differences between stream reaches with natural, IAT-infested and IAT-cleared riparian vegetation types, based on several metrics: immature macroinvertebrate taxon richness, average score per macroinvertebrate taxon (ASPT), a macroinvertebrate subset (Ephemeroptera, Plecoptera, Trichoptera and Odonata larvae; EPTO), and adult dragonfly species richness. Reaches with natural vegetation, or cleared of IATs, supported greater relative diversity of macroinvertebrates than reaches shaded by dense IATs. Greatest macroinvertebrate ASPT and EPTO were in reaches bordered by natural vegetation and those bordered by vegetation cleared of IATs, and the lowest where the riparian corridor was IATs. Highest number of adult dragonflies species was along streams cleared of dense IATs. Overall, results showed that removal of a highly invasive, dense canopy of alien trees enables recovery of aquatic biodiversity. As benthic macroinvertebrate scores and adult dragonfly species richness are correlated and additive, their combined use is recommended for river condition assessments.

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Acknowledgments

We thank Steven Lumber Mills and Komatiland Forest for allowing access to their plantations, S. Taylor for logistic support, and G. Diedericks for access to his internal report. We especially thank R. Madzivhe, M. Tshikalange, G. Maluleke and L. Magoba for assistance in the field. Financial support was from the Working for Water Programme.

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  1. Department of Conservation Ecology and Entomology, and Centre for Invasion Biology, University of Stellenbosch, P/Bag X1, Matieland, 7602, South Africa

    Rembu N. Magoba & Michael J. Samways

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  1. Rembu N. Magoba
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Correspondence to Michael J. Samways.

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Magoba, R.N., Samways, M.J. Recovery of benthic macroinvertebrate and adult dragonfly assemblages in response to large scale removal of riparian invasive alien trees. J Insect Conserv 14, 627–636 (2010). https://doi.org/10.1007/s10841-010-9291-5

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