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Interactive multiple-stressor effects of the antibiotic monensin, cattle effluent and light on stream periphyton

Winkworth, Cynthia L. ; Salis, Romana K. LU and Matthaei, Christoph D. (2015) In Freshwater Biology 60(11). p.2410-2423
Abstract

Streams draining agricultural land are simultaneously exposed to multiple stressors including agricultural antibiotics and effluent from surface water run-off. The potential interactive effects of these contaminants on stream benthic communities are poorly understood. Using a streamside channel experiment with a full factorial, repeated-measures design, we assessed the individual and combined effects of the veterinary antibiotic monensin (four concentrations versus control), dairy cattle effluent (added versus control) and differing light levels (reduced versus ambient) on benthic stream periphyton (biomass accrual, community composition and ecological algal guilds). Antibiotic and effluent treatments were applied during a 24-hour pulse... (More)

Streams draining agricultural land are simultaneously exposed to multiple stressors including agricultural antibiotics and effluent from surface water run-off. The potential interactive effects of these contaminants on stream benthic communities are poorly understood. Using a streamside channel experiment with a full factorial, repeated-measures design, we assessed the individual and combined effects of the veterinary antibiotic monensin (four concentrations versus control), dairy cattle effluent (added versus control) and differing light levels (reduced versus ambient) on benthic stream periphyton (biomass accrual, community composition and ecological algal guilds). Antibiotic and effluent treatments were applied during a 24-hour pulse to simulate run-off from farmland, while light was manipulated throughout the experiment, to mimic the presence or absence of riparian shading. Periphyton taxon richness was decreased by the two highest antibiotic levels 8 days after the pulse. Multivariate community composition (relative abundances of the 15 most common periphyton taxa) was also affected by all three stressors 8 days post-pulse. However, the periphyton community recovered within 16 days post-pulse. Interactions among stressors were fairly common, occurring for two of three ecological algal guilds and six of the 15 common taxa. Nevertheless, interactions were generally subtle, without any strong synergistic or antagonistic patterns. Our study shows that the antibiotic monensin can negatively affect stream periphyton communities, but also implies short pulses may not have lasting impacts. The lack of strong synergistic or antagonistic interactions between monensin and light or effluent indicates monensin effects on stream periphyton may be predicted reasonably well based on single-stressor studies.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
Algae, Algal guilds, Land use, Veterinary antibiotics
in
Freshwater Biology
volume
60
issue
11
pages
2410 - 2423
publisher
Wiley-Blackwell
external identifiers
  • scopus:84943359315
ISSN
0046-5070
DOI
10.1111/fwb.12666
language
English
LU publication?
no
id
9d0fb6a3-fa1f-4ac3-976d-d87877497a5c
date added to LUP
2019-11-06 14:37:48
date last changed
2020-01-30 03:56:37
@article{9d0fb6a3-fa1f-4ac3-976d-d87877497a5c,
  abstract     = {<p>Streams draining agricultural land are simultaneously exposed to multiple stressors including agricultural antibiotics and effluent from surface water run-off. The potential interactive effects of these contaminants on stream benthic communities are poorly understood. Using a streamside channel experiment with a full factorial, repeated-measures design, we assessed the individual and combined effects of the veterinary antibiotic monensin (four concentrations versus control), dairy cattle effluent (added versus control) and differing light levels (reduced versus ambient) on benthic stream periphyton (biomass accrual, community composition and ecological algal guilds). Antibiotic and effluent treatments were applied during a 24-hour pulse to simulate run-off from farmland, while light was manipulated throughout the experiment, to mimic the presence or absence of riparian shading. Periphyton taxon richness was decreased by the two highest antibiotic levels 8 days after the pulse. Multivariate community composition (relative abundances of the 15 most common periphyton taxa) was also affected by all three stressors 8 days post-pulse. However, the periphyton community recovered within 16 days post-pulse. Interactions among stressors were fairly common, occurring for two of three ecological algal guilds and six of the 15 common taxa. Nevertheless, interactions were generally subtle, without any strong synergistic or antagonistic patterns. Our study shows that the antibiotic monensin can negatively affect stream periphyton communities, but also implies short pulses may not have lasting impacts. The lack of strong synergistic or antagonistic interactions between monensin and light or effluent indicates monensin effects on stream periphyton may be predicted reasonably well based on single-stressor studies.</p>},
  author       = {Winkworth, Cynthia L. and Salis, Romana K. and Matthaei, Christoph D.},
  issn         = {0046-5070},
  language     = {eng},
  month        = {01},
  number       = {11},
  pages        = {2410--2423},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Interactive multiple-stressor effects of the antibiotic monensin, cattle effluent and light on stream periphyton},
  url          = {http://dx.doi.org/10.1111/fwb.12666},
  doi          = {10.1111/fwb.12666},
  volume       = {60},
  year         = {2015},
}