Response of water column microbial communities to sudden exposure to deltamethrin in aquatic mesocosms

C.W. Knapp, T. Caquet, M.L. Hanson, L. Lagadic, D.W. Graham

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Sudden exposure of an aquatic system to an insecticide can have significant effects on populations other than susceptible organisms. Although this is intuitively obvious, little is actually known about how such exposure might affect bacterial communities and their relative metabolic activity in ecosystems. Here, we assessed small sub-unit (ssu)-RNA levels in open and shaded 9 m(3) aquatic mesocosms (16 units -2 x 2 factorial design in quadruplicate) to examine the effects of sudden addition of deltamethrin to the units. When deltamethrin was added, a cascade of bacterial then phytoplankton ''blooms'' occurred over time. The bacterial bloom, which most likely included organisms from the plastid/cyanobacterial phylogenetic guild, was almost immediate (within hours), whereas the phytoplankton (algal) bloom lagged by about 4 days. This sequential response can be explained by an apparent sudden release of nutrients consequent to arthropod death that triggered a series of responses in the microbial loop. Interestingly, bacterial blooms were noted in both open and shaded mesocosms, whereas the algal bloom was only seen in open units, suggesting that both deltamethrin addition (and presumptive nutrient release) and an adequate light supply was required for the phytoplankton response. Overall, this work shows that microbial activities as reflected by ssu-rRNA levels can respond dramatically via apparently indirect effects following insecticide application. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)157-165
Number of pages9
JournalFEMS Microbiology Ecology
Volume54
Issue number1
DOIs
Publication statusPublished - Sep 2005

Fingerprint

deltamethrin
Phytoplankton
Eutrophication
microbial community
algal bloom
water column
Insecticides
Water
phytoplankton
Food
Plastids
Arthropods
insecticide
Ecosystem
microbial loop
RNA
nutrient
plastid
Light
guild

Keywords

  • deltamethrin
  • pesticide
  • aquatic
  • Ssu-rRNA
  • bacteria
  • phytoplankton
  • indirect effects
  • microbiology
  • chemistry

Cite this

Knapp, C.W. ; Caquet, T. ; Hanson, M.L. ; Lagadic, L. ; Graham, D.W. / Response of water column microbial communities to sudden exposure to deltamethrin in aquatic mesocosms. In: FEMS Microbiology Ecology. 2005 ; Vol. 54, No. 1. pp. 157-165.
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Response of water column microbial communities to sudden exposure to deltamethrin in aquatic mesocosms. / Knapp, C.W.; Caquet, T.; Hanson, M.L.; Lagadic, L.; Graham, D.W.

In: FEMS Microbiology Ecology, Vol. 54, No. 1, 09.2005, p. 157-165.

Research output: Contribution to journalArticle

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