期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 742, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.140657
关键词
Pollution; Trace metals; Global change; Parasitism; Ecophysiology; Structural equation modelling
资金
- Adour-Garonne water agency (PHYPAT project)
- french national programme CNRS EC2CO-Ecodyn
- LTSER ZA PYGAR
- French Ministry of Higher Education and Research
- French Laboratory of Excellence TULIP [ANR-10-LABX-41, ANR-11-IDEX-0002-02]
Freshwater fish face multiple challenges in human-altered rivers such as trace metal contamination, temperature increase and parasitism. These multiple stressors could have unexpected interactive effects on fish health due to shared physiological pathways, but few studies investigated this question in wild fish populations. In this study, we compared 16 populations of gudgeon (Gobio occitaniae) distributed along perturbation gradients in human-altered rivers in the South of France. We tested the effects of single and combined stressors (i.e., metal contamination, temperature, parasitism) on key traits linked to fish health across different biological levels using a Structural Equation Modelling approach. Parasitism and temperature alone had limited deleterious effects on fish health. In contrast, fish living in metal-contaminated sites had higher metal bioaccumulation and higher levels of cellular damage in the liver through the induction of an inflammatory response. In addition, temperature and contamination had interactive negative effects on growth. These results suggest that trace metal contamination has deleterious effects on fish health at environmentally realistic concentrations and that temperature can modulate the effects of trace metals on fish growth. With this study, we hope to encourage integrative approaches in realistic field conditions to better predict the effects of natural and anthropogenic stressors on aquatic organisms. (C) 2020 Elsevier B.V. All rights reserved.
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