Dose‐ and time‐dependent effects of an immune challenge on fish across biological levels
[SDE] Environmental Sciences
Lipopolysaccharides
0301 basic medicine
Cypriniformes
Oxidative Stress
0303 health sciences
03 medical and health sciences
Time Factors
Behavior, Animal
Animals
14. Life underwater
DOI:
10.1002/jez.2430
Publication Date:
2020-11-17T11:10:31Z
AUTHORS (7)
ABSTRACT
AbstractDue to global changes, fish are increasingly exposed to immune challenges associated with disease outbreaks in aquatic ecosystems. Adjustments in physiology and behavior are generally critical to maintaining homeostasis after an immune challenge, but there is limited knowledge on the specific thresholds and dynamics of responses across levels of biological organization in fish. In this study, we tested how different concentrations of an antigens mixture (phytohemagglutinin and lipopolysaccharide) affected innate immunity with potential consequences on oxidative stress, energy reserves, body condition, and behavior across time, using the common gudgeon (Gobio sp.) as model species. The immune challenge induced a transitory increase in lytic enzyme activity (i.e., lysozyme) and local immune response (i.e., skin swelling) 2 days after the antigen injection. The available energy stored in muscle was also reduced 4 days after injection, without inducing oxidative stress at the cellular level. Overall, the immune challenge induced limited costs at the molecular and cellular levels but had strong effects at the whole organism level, especially on behavior. Indeed, fish swimming activity and sociability were affected in a dose‐ and time‐dependent manner. These results suggest that immune challenges have dose‐dependent effects across levels of biological organization and that behavior is a key response trait to cope with pathogen‐induced immune costs in the wild, although fitness consequences remain to be tested.
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