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David vs. Goliath: Serotonin modulates opponent perception between smaller and larger rivals.

Abstract：

:During agonistic encounters, the perception of a larger opponent through morphological signaling typically suppresses aggression in the smaller individual, preventing contest intensity escalation. However, non-morphological factors such as central serotonin (5-HT) activity can influence individual aggression, potentially altering contest intensity despite initial size discrepancies. When male stalk-eyed flies (Teleopsis dalmanni) fight, contest escalation is directly proportional to similarity in body size, with escalation being lower in size-mismatched contests. We have shown that both high-intensity aggression and the probability of winning are increased in males with pharmacologically elevated 5-HT relative to size-matched non-treated opponents. Here, we hypothesized that, in size-mismatched contests, increasing brain 5-HT in the smaller opponent could similarly increase aggression and counteract the low contest intensity normally driven by size discrepancy. Size-mismatched male pairs (greater than 5% difference in eyestalk length) engaged in a forced fight paradigm, with the smaller fly either untreated or with pharmacologically elevated 5-HT levels. The expression of high-intensity aggressive behaviors was significantly increased in smaller treated opponents, but the probability of winning was not altered. This suggests that while elevated serotonergic activity can increase aggression and intensity despite perception of a larger opponent, this is not sufficient to overcome size biases with respect to contest outcome. However, the fact that larger opponents continued to win against smaller treated flies was not simply a function of size. Instead, untreated larger males adjusted their fighting strategy to match the increased aggression of their smaller treated opponent, suggesting contextual flexibility in behavior based on individual opponent assessment.

journal_name

Behav Brain Res

journal_title

Behavioural brain research

authors

Bubak AN,Rieger NS,Watt MJ,Renner KJ,Swallow JG

doi

10.1016/j.bbr.2015.07.028

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

521-7

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(15)30099-1

journal_volume

292

pub_type

杂志文章

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David vs. Goliath: Serotonin modulates opponent perception between smaller and larger rivals.