Summary
Dominance hierarchy was determined in 5 groups of juvenile Arctic charr (Salvelinus alpinus), each group consisting of 4 fish. Telencephalon and brain stem (remaining parts of the brain) were analyzed with regard to their content of monoamines and monoamine metabolites. No significant differences were observed in the concentrations of norepinephrine (NE), dopamine (DA), or serotonin (5-hydroxytryptamine, 5-HT) between fish with different social rank. However, the concentration of 5-hydroxyindoleacetic acid (5-HIAA), the principle metabolite of 5-HT, was significantly higher in subordinate fish, and a significant inverse linear correlation was found between 5-HIAA concentration and social rank (as measured by dominance index) in the brain stem. In the telencephalon the dominant fish had a significantly higher level of homovanillic acid (HVA), a major DA metabolite. These findings indicate a greater serotonergic activity, possibly associated with increased stress, as well as a lower dopaminergic activity, possibly associated with reduced aggression, in subordinate charr. The differences between dominant and subordinate fish could either be caused by social interactions or reflect innate individual differences in monoamine utilization, predisposing individuals for dominant or subordinate positions in the dominance hierarchy.
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Abbreviations
- DA :
-
dopamine
- DI :
-
dominance index
- NE :
-
norepinephrine
- 5-HT :
-
serotonin (5-hydroxytryptamine)
- 5-HIAA :
-
5-hydroxyindoleacetic acid
- 5-HTOH :
-
5-hydroxytryptophol
- HVA :
-
homovanillic acid
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Winberg, S., Nilsson, G.E. & Olsén, K.H. Social rank and brain levels of monoamines and monoamine metabolites in Arctic charr, Salvelinus alpinus (L.). J Comp Physiol A 168, 241–246 (1991). https://doi.org/10.1007/BF00218416
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DOI: https://doi.org/10.1007/BF00218416