Persistent organic pollutant (POP) contamination of Polar Regions continues to present a major ecological challenge and an environmental stressor to local biota. Antarctic krill (Euphausia superba) are a keystone species of the Antarctic sea ice ecosystem. Krill have repeatedly been found to accumulate a diverse array of POPs and thereby serve as vectors of these to the remainder of the Antarctic food web. p,p′-Dichlorodiphenyldichloroethylene (p,p′-DDE) is a dominant POP compound accumulating in Antarctic krill and higher trophic level predators. Recently, p,p′-DDE uptake dynamics, associated behavioural and developmental toxicity were evaluated in this species. The present study investigated the response of enzymes with known roles in detoxification (glutathione S-transferase, GST and cytochrome P450 2B, CYP2B), neurotoxicity (acetylcholinesterase, AChE) and oxidative stress (glutathione peroxidase GPx) in Antarctic krill exposed to p,p′-DDE. CYP2B was not detectable in Antarctic krill. No strong concentration responses resulted from the exposure to p,p′-DDE. These findings do not provide evidence for an activated detoxification response to this compound via the tested biochemical pathways in Antarctic krill. This is the first time that GST, AChE and GPx have been characterised in this species following pollutant exposure. Further research with additional pollutants and compound mixtures is necessary to assess the practical role of these enzymes as biomarkers of pollutant exposure in Antarctic krill. These first exploratory findings present a valuable contribution to a critical knowledge gap in polar ecotoxicology, namely the comparative sensitivity of polar organisms relative to temperate and tropical counterparts.
Polar Biology – Springer Journals
Published: Sep 19, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera