Responses of Phytoplankton and Hyalella azteca to Agrichemical Mixtures in a Constructed Wetland Mesocosm

  • Richard E. LizotteJr.Email author
  • Sam TestaIII
  • Martin A. Locke
  • R. Wade SteinriedeJr.


We assessed the capability of a constructed wetland to mitigate toxicity of a variety of possible mixtures, such as nutrients only (NO) (nitrogen [N], phosphorus [P]), pesticides only (PO) (atrazine, S-metolachlor, permethrin), and nutrients + pesticides on phytoplankton chlorophyll-a, on 48-h aqueous Hyalella azteca survival and 10-day sediment H. azteca survival and growth. Water and sediment were collected at 10-, 20-, and 40-m distances from inflow and analyzed for nutrients, pesticides, chlorophyll-a, and H. azteca laboratory bioassays. Phytoplankton chlorophyll-a increased 4- to 10 -fold at 7 days after NO treatment. However, responses of chlorophyll-a to PO and nutrients + pesticides were more complex with associated decreases at only 20 m for pesticides only and 10 and 40 m for nutrients + pesticides treatments. H. azteca aqueous survival decreased within the first 48 h of dosing at 10- and 20-m distances during PO and nutrients + pesticides treatments in association with permethrin concentrations. H. azteca sediment survival was unaffected, whereas 10-day growth decreased within 1 day of dosing at all sites during nutrients + pesticides treatment. Constructed wetlands were shown to be an effective agricultural best-management tool for trapping pollutants and mitigating ecological impacts of run-off in agricultural watersheds.


Phytoplankton Atrazine Phytoplankton Growth Rate Autumnal Equinox Hyalella Azteca 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank John Massey, Lisa Brooks and Renée Russell for assistance with logistics, sample collection, and analysis. Mention of equipment, computer programs, or a chemical does not constitute an endorsement for use by the United States Department of Agriculture nor does it imply pesticide registration under FIFRA as amended. The United States Department of Agriculture is an equal opportunity employer.

Supplementary material

244_2013_9927_MOESM1_ESM.doc (38 kb)
Supplementary material 1 (DOC 38 kb)


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Copyright information

© Springer Science+Business Media New York (outside the USA) 2013

Authors and Affiliations

  • Richard E. LizotteJr.
    • 1
    Email author
  • Sam TestaIII
    • 1
  • Martin A. Locke
    • 1
  • R. Wade SteinriedeJr.
    • 1
  1. 1.National Sedimentation LaboratoryUSDA-ARS OxfordUSA

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