Combined effects from γ radiation and fluoranthene exposure on carbon transfer from phytoplankton to zooplankton

Nascimento, Francisco J.A.; Svendsen, Claus ORCID: https://orcid.org/0000-0001-7281-647X; Bradshaw, Clare. 2015 Combined effects from γ radiation and fluoranthene exposure on carbon transfer from phytoplankton to zooplankton. Environmental Science & Technology, 49 (17). 10624-10631. https://doi.org/10.1021/acs.est.5b03128

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Official URL: http://dx.doi.org/10.1021/acs.est.5b03128

Abstract/Summary

Risk assessment does not usually take into account mixtures of contaminants, thus potentially under- or overestimating environmental effects. We investigated how the transfer of carbon between a primary producer, Pseudokirchneriella subcapitata, and a consumer, Daphnia magna, is affected by acute exposure of γ radiation (GR) in combination with the polycyclic aromatic hydrocarbon fluoranthene (FA). We exposed D. magna to five concentrations of FA and five acute doses of GR as single contaminants and in nine binary combinations. We compared the observed data for three end points (incorporation of carbon by D. magna, D. magna ingestion rates, and growth) to the predicted joint effects of the mixed stressors based on the independent action (IA) concept. There were deviations from the IA predictions, especially for ingestion rates and carbon incorporation by D. magna, where antagonistic effects were observed at the lower doses, while synergism was seen at the highest doses. Our results highlight the importance of investigating the effects of exposure to GR in a multistressor context. In mixtures of GR and FA, the IA-predicted effects seem to be conservative as antagonism between the two stressors was the dominant pattern, possibly due to stimulation of cellular antioxidative stress mechanisms.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1021/acs.est.5b03128
UKCEH and CEH Sections/Science Areas:	Acreman
ISSN:	0013-936X
NORA Subject Terms:	Ecology and Environment
Date made live:	22 Mar 2016 14:23 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/513304

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1021/acs.est.5b03128

UKCEH and CEH Sections/Science Areas:

Acreman

ISSN:

0013-936X

NORA Subject Terms:

Ecology and Environment

Date made live:

22 Mar 2016 14:23 +0 (UTC)