Bioaccumulation of organochlorine pesticides in Antarctic krill (Euphausia superba): Profile, influencing factors, and mechanisms

Accumulation of organochlorine pesticides (OCPs) in Antarctic krill (Euphausia superba), a keystone species in the Southern Ocean, is potentially harmful to the Antarctic ecosystem and human health. In the current study, we collected E. superba specimens (including muscle and carapace tissues) from...

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Bibliographic Details
Published in:Journal of Hazardous Materials
Main Authors: Xie, Jingqian, Tao, Ling, Wu, Qiang, Bian, Zhihe, Wang, Mengqiu, Li, Yingming, Zhu, Guoping, Lin, Tian
Format: Report
Language:English
Published: ELSEVIER 2022
Subjects:
Engineering
Environmental Sciences & Ecology
Antarctic krill
Organochlorine pesticides
Bioaccumulation
Trophic linkage
in vitro silicon modeling
Environmental
Environmental Sciences
PERSISTENT ORGANIC POLLUTANTS
DIPHENYL ETHERS PBDES
MARGINAL ICE-ZONE
POLYCHLORINATED-BIPHENYLS
RESEARCH STATION
GROWTH
PCBS
MODEL
OCPS
CONTAMINANTS
Antarctic
Antarctic Peninsula
Bransfield Strait
Southern Ocean
The Antarctic
Antarc*
Antarctic Krill
Antarctica
Euphausia superba
Online Access:http://ir.gig.ac.cn/handle/344008/66391
https://doi.org/10.1016/j.jhazmat.2021.128115
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Summary:Accumulation of organochlorine pesticides (OCPs) in Antarctic krill (Euphausia superba), a keystone species in the Southern Ocean, is potentially harmful to the Antarctic ecosystem and human health. In the current study, we collected E. superba specimens (including muscle and carapace tissues) from Bransfield Strait in northern Antarctic Peninsula and South Georgia to analyze the profile, influencing factors and mechanisms of OCPs bioaccumulation in them. Results indicated that the biological traits (813C, 815N and lipid contents) of krill were significantly affected by habitat. There may exist growth dilution of OCPs in Antarctic krill and no fresh OCPs input in Antarctica, except for endosulfan I. Based on lipid-normalized concentrations, no significant differences were observed between the two regions at most sampling sites. However, OCP levels showed tissue and sex dependence. Boosted regression trees (BRTs) and partial least squares structural equation models (PLS-SEMs) were built to better investigate the main factors affecting the bioaccumulation of OCPs. Lipid content, negatively correlated with OCP levels, was the main factor. In vitro silicon modeling indicated that CYP3A4 metabolism capacity in krill contributed to the OCP residues except for endosulfan I. The results of this study expand current knowledge of OCPs in Antarctic marine biota, as well as their influencing factors and potential mechanisms.

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