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Ecotoxicology

, Volume 13, Issue 7, pp 707–720 | Cite as

Seasonal Variation in Plankton Community Responses of Mesocosms Dosed with Pentachlorophenol

  • Kate J. Willis
  • Paul J. Van Den Brink
  • John D. Green
Article

Abstract

Seasonal variations in plankton community response to pentachlorophenol (PCP) were studied in four mesocosm experiments using enclosures in a small lake. The mesocosms (860 l) were dosed with single applications of technical grade PCP (0, 4, 10, 24, 36, 54, 81 and 121 μg/l PCP) and monitored for 20 days. Multivariate statistical analyses showed that plankton community taxonomic composition varied with season. In winter and spring, communities were most stable in time; species diversity and abundance were lowest in winter. Seasonally, the communities varied little with respect to the dominant species, which were the copepod Calamoecia lucasi, the alga Peridinium sp. and the rotifer Ascomorpha ovalis. The direct effects of the PCP additions varied little between seasons, but indirect effects were evident at lower treatment levels in autumn. Indirect effects were not evident in winter. Minor variations in plankton community responses to PCP with season were apparent in the following order of decreasing sensitivity; autumn ≥ winter/spring ≥ summer. At the species level, C. lucasi showed the largest response. The responses observed were greatest in autumn, with decreased abundance at PCP concentrations ≥ 24 μg/l. In the other seasons, effects were observed at levels of 54 or 81μg/l and higher. Ascomorpha ovalis was the most responding rotifer in winter and spring, whereas Anuraeopsis fissa responded more strongly in autumn and summer. The dinoflagellate alga Peridinium sp. had the largest negative response in all but winter, when Dinobryon cylindricum did. Cryptomonas sp. responded positively to PCP in all seasons, increasing in abundance in the highest treatments, possibly due to reduced grazing pressure, reduced competition, or increased decomposition. The plankton community no-observed effect-concentration (NOEC) was 24–36 μg/l PCP. Results reported here suggest that the Australian and New Zealand water quality guideline values for PCP are sufficient to protect plankton communities against adverse effects.

Keywords

seasonal responses plankton community copepods mesocosms PCP 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Kate J. Willis
    • 1
    • 3
  • Paul J. Van Den Brink
    • 2
  • John D. Green
    • 1
  1. 1.Centre for Biodiversity and Ecology ResearchUniversity of WaikatoHamiltonNew Zealand
  2. 2.Alterra Green World ResearchWageningen University and Research CentreWageningenThe Netherlands
  3. 3.Scottish Association for Marine Science Dunstaffnage Marine LaboratoryOban, ArgyllScotland

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