Parasitism reduces oxidative stress of fish host experimentally exposed to PAHs

Ecotoxicology and Environmental Safety

Simon Agostini¹  Clotilde Biard²  Aurélie Goutte³  Alexis Millot³  Fabrice Alliot³  Beatriz Decencière⁴  Frédéric Angelier⁵  Noëlie Molbert⁵  Cécile Ribout⁶  Mathieu Leroux-Coyau⁶ 

[1] Correspondence to: Sorbonne Université, CNRS, EPHE UMR METIS, 4 Place Jussieu, Paris 75252 Cedex 05, France.;METIS, Sorbonne Université, EPHE, Université PSL, CNRS, 75005 Paris, France;CNRS ENS, UMS 3194, CEREEP–Ecotron Ile De France-Ecole Normale Supérieure, St-Pierre-lès-Nemours 77140, France;Centre d′Etudes Biologiques de Chizé (CEBC), UMR 7372 CNRS, La Rochelle Université, F-79360, France;Sorbonne Université, CNRS, EPHE, UMR METIS, F-75005, Paris, France;Sorbonne Université, UPEC, Paris 7, CNRS, INRA, IRD, Institut d′Ecologie et des Sciences de l′Environnement de Paris, F-75005, Paris, France;

关键词: Aquatic ecotoxicology;    Acanthocephalan;    Ecophysiology;    Metabolites;    Telomeres;    Wildlife;   

DOI  :  

来源: DOAJ

【 摘 要 】

Some parasites are known to bioaccumulate some environmental pollutants within their host. We hypothesized that these parasites may be beneficial for their hosts in polluted environments. We experimentally increased long-term (five weeks) exposure to polycyclic aromatic hydrocarbons (PAHs, three levels: 0.1X, 1X, 10X environmental exposure) in European chubs (Squalius cephalus) that were naturally infected or uninfected with acanthocephalan parasites. We monitored PAHs levels in fish tissues, as well as oxidative stress, telomere length and condition indices. Although parasite infection did not significantly reduce the levels of PAHs and PAH metabolites in host tissues, host oxidative status was explained by parasitism and pollution levels. Oxidative damage increased with parasitism in fish exposed to low PAH levels (0.1X) but decreased in infected fish at higher PAH exposure (10X), thus corroborating our hypothesis. Meanwhile, antioxidant capacity did not differ in response to parasite infection nor PAHs exposure. Despite this imbalance in oxidative status, experimental increase in PAH levels did not compromise telomere length, body condition, or survival in infected and uninfected fish. This study provides the first experimental evidence that the outcome of host-parasite interactions can shift from negative to positive as pollutant exposure increases.

【 授权许可】

Unknown