How do dominance experiences affect serotonin systems in rainbow trout and lizards?

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red deer stags (Cervus elaphus) — Aggressive behaviour A pair of red deer stags (*Cervus elaphus*) competing for possession of a female in the rutting season.

In both rainbow trout and lizards, fighting experience significantly influences brain biochemistry, particularly within the limbic system. Research indicates that dominance experiences lead to distinct patterns of activity in the brain's serotonin systems:

Dominant animals: These individuals exhibit a transient activation of the serotonin systems.
Subordinate animals: These individuals show a longer-term elevation of these systems.

These findings highlight how social status and the outcome of aggressive interactions can modulate neuroendocrine responses in these vertebrate species.1