Abstract
The integrity of freshwater ecosystems worldwide is under threat from agriculture and invasive species. Past agricultural activity can have persistent effects on aquatic diversity even decades after restoration, and the spread of invasive species is increasingly difficult to prevent due to globalisation. In the South Island of New Zealand, the invasive diatom Didymosphenia geminata (Didymo) causes nuisance blooms in streams. The impact of Didymo on stream invertebrate communities in upland streams with natural flow regimes remains poorly understood. We investigated the relationships between legacy effects of agriculture, Didymo and benthic invertebrate communities at 55 stream sites in Mahu Whenua, a 530 km2 conservation area comprising four former New Zealand high-country farms. The farms were destocked of sheep 4–9 years before stream sampling started. Kick-netting was used to collect macroinvertebrates from 7–23 streams within each farm to provide a land-use legacy gradient. Moreover, samples from 16 sites with clearly visible Didymo mats covering most of the stream bed (indicating high biomass and a dominant role in the biofilm) were compared with 39 sites without such Didymo mats. Total invertebrate taxon richness and EPT richness (taxon richness of larval mayflies, stoneflies and caddisflies) were lower in the stream catchments destocked most recently. When Didymo was present, relative EPT abundance was lower than when Didymo was absent, and Deleatidium mayflies decreased whereas midges and oligochaetes increased. These results highlight the need to look at past land-use practices when restoring high-country streams after agricultural impacts. They also show that Didymo can have negative effects on invertebrate communities in upland streams with natural flow regimes, a stream type previously overlooked in studies on this invasive diatom.
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Acknowledgements
Our sincere thanks go to Russell Hamilton (Mt Soho Ltd) who went out of his way to provide logistic support with the fieldwork and indispensable knowledge about Mahu Whenua. We thank Bryony Alden, Charlotte Patterson, Torea Scott-Fyfe, Julia Hunn and Matt Ward for their help in the field and/or the laboratory, and Nicola McHugh who was extremely helpful inside and outside the laboratory. The comments of two anonymous referees considerably improved the manuscript. Financial support came from a University of Otago Priming Partnerships grant and a grant from Mt Soho Ltd & Queen Elizabeth II Trust.
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Anderson, S.E., Closs, G.P. & Matthaei, C.D. Agricultural Land-Use Legacy, The Invasive Alga Didymosphenia geminata and Invertebrate Communities in Upland Streams with Natural Flow Regimes. Environmental Management 65, 804–817 (2020). https://doi.org/10.1007/s00267-020-01285-6
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DOI: https://doi.org/10.1007/s00267-020-01285-6