Dynamic links between lipid storage, toxicokinetics and mortality in a marine copepod exposed to dimethylnaphthalene

Overview
TitleDynamic links between lipid storage, toxicokinetics and mortality in a marine copepod exposed to dimethylnaphthalene
AuthorsJager T, Øverjordet IB, Nepstad R, Hansen BH
TypeJournal Article
Journal NameEnvironmental science & technology
VolumeN/A
IssueN/A
Year2017
Page(s)N/A
CitationJager T, Øverjordet IB, Nepstad R, Hansen BH. Dynamic links between lipid storage, toxicokinetics and mortality in a marine copepod exposed to dimethylnaphthalene. Environmental science & technology. 2017 Jun 09.

Abstract

Efficiently assessing and managing the risks of pollution in the marine environment requires mechanistic models for toxic effects. The General Unified Threshold model for Survival (GUTS) provides a framework for deriving toxicokinetic-toxicodynamic (TKTD) models for the endpoint survival. Two recurring questions in the application of GUTS concern the most appropriate death mechanism, and whether the total body residue is a proper dose metric for toxic effects. We address these questions with a case study for dimethylnaphthalene in the marine copepod Calanus finmarchicus. A detailed analysis revealed that body residues were best explained by representing copepods with two toxicokinetic compartments: separating structural biomass and lipid storage. Toxicity is most likely related to the concentration in structure, which led to identification of 'stochastic death' as the most appropriate death mechanism. Interestingly, the parameterised model predicts that lipid content will have only minor influence on short-term toxicity. However, the toxicants stored in lipids may have more substantial impacts in situations not included in our experiments (e.g., during diapause and gonad maturation), and for contaminant transfer to eggs and copepod predators.

Properties
Additional details for this publication include:
Property NameValue
Publication ModelPrint-Electronic
ISSN1520-5851
eISSN1520-5851
Publication Date2017 Jun 09
Journal AbbreviationEnviron. Sci. Technol.
DOI10.1021/acs.est.7b02212
Elocation10.1021/acs.est.7b02212
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountryUnited States
Cross References
This publication is also available in the following databases:
DatabaseAccession
PMID: PMID:28598612