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    Biogeochemistry and community ecology in a spring-fed urban river following a major earthquake

    Wells, Naomi; Clough, Timothy J.; Condron, Leo M.; Baisden, W. T.; Harding, J. S.; Dong, Y.; Lewis, G. D.; Lear, G.
    Abstract
    In February 2011 a Mw 6.3 earthquake in Christchurch, New Zealand inundated urban waterways with sediment from liquefaction and triggered sewage spills. The impacts of, and recovery from, this natural disaster on the stream biogeochemistry and biology were assessed over six months along a longitudinal impact gradient in an urban river. The impact of liquefaction was masked by earthquake triggered sewage spills (∼20,000 m³ day⁻¹ entering the river for one month). Within 10 days of the earthquake dissolved oxygen in the lowest reaches was <1 mg l⁻¹, in-stream denitrification accelerated (attenuating 40–80% of sewage nitrogen), microbial biofilm communities changed, and several benthic invertebrate taxa disappeared. Following sewage system repairs, the river recovered in a reverse cascade, and within six months there were no differences in water chemistry, nutrient cycling, or benthic communities between severely and minimally impacted reaches. This study highlights the importance of assessing environmental impact following urban natural disasters.... [Show full abstract]
    Keywords
    stream biofilm; stable isotopes; sewage contamination; liquefaction; natural disaster recovery; Environmental Sciences; Animals; Invertebrates; Water Pollutants, Chemical; Ecosystem; Rivers; Environmental Monitoring; New Zealand; Earthquakes
    Fields of Research
    0402 Geochemistry; 040299 Geochemistry not elsewhere classified; 04 Earth Sciences; 0406 Physical Geography and Environmental Geoscience; 040603 Hydrogeology; 0602 Ecology; 060204 Freshwater Ecology; 0605 Microbiology; 060504 Microbial Ecology
    Date
    2013-11
    Type
    Journal Article
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    DOI
    https://doi.org/10.1016/j.envpol.2013.07.017
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    © 2013 Elsevier Ltd. All rights reserved
    Citation
    Wells et al. (2013). Biogeochemistry and community ecology in a spring-fed urban river following a major earthquake. Environmental Pollution, 182, 190-200. doi 10.1016/j.envpol.2013.07.017
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