Journal article 991 views 234 downloads
Collective action reduces androgen responsiveness with implications for shoaling dynamics in stickleback fish
Ines Fuertbauer 
,
Rowan Brown ,
Michael Heistermann
,
Rowan Brown ,
Michael Heistermann
Hormones and Behavior, Volume: 119, Start page: 104636
Swansea University Authors:
Ines Fuertbauer , Rowan Brown
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DOI (Published version): 10.1016/j.yhbeh.2019.104636
Abstract
Androgens, traditionally viewed as hormones that regulate secondary sexual characteristics and reproduction in male vertebrates, are often modulated by social stimuli. High levels of the ‘social hormone’ testosterone (T) are linked to aggression, dominance, and competition. Low T levels, in contrast...
| Published in: | Hormones and Behavior |
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| ISSN: | 0018-506X |
| Published: |
Elsevier BV
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa52635 |
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| Abstract: |
Androgens, traditionally viewed as hormones that regulate secondary sexual characteristics and reproduction in male vertebrates, are often modulated by social stimuli. High levels of the ‘social hormone’ testosterone (T) are linked to aggression, dominance, and competition. Low T levels, in contrast, promote sociopositive behaviours such as affiliation, social tolerance, and cooperation, which can be crucial for group-level, collective behaviours. Here, we test the hypothesis that - in a collective context - low T levels should be favourable, using non-reproductive male and female stickleback fish (Gasterosteus aculeatus) and non-invasive waterborne hormone analysis. In line with our predictions, we show that the fishes' T levels were significantly lower during shoaling compared to when alone, with high-T individuals showing the largest decrease. Ruling out stress-induced T suppression and increased T conversion into oestradiol, we find evidence that shoaling directly affects androgen responsiveness. We also show that groups characterized by lower mean T exhibit less hierarchical leader-follower dynamics, suggesting that low T promotes egalitarianism. Overall, we show that collective action results in lower T levels, which may serve to promote coordination and group performance. Our study, together with recent complementary findings in humans, emphasizes the importance of low T for the expression of sociopositive behaviour across vertebrates, suggesting similarities in endocrine mechanisms. |
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| Keywords: |
Collective hormone profiles, Social context, Social modulation, Social tolerance, Testosterone |
| College: |
Faculty of Science and Engineering |
| Start Page: |
104636 |