Status-dependent metabolic effects of social interactions in a group-living fish

Biology Letters, Journal Year: 2024, Volume and Issue: 20(7)

Published: July 1, 2024

Social interactions can sometimes be a source of stress, but social companions also ameliorate and buffer against stress. Stress metabolism are closely linked, the degree to which modulate metabolic responses during stressful situations—and whether such effects differ depending on rank—is poorly understood. To investigate this question, we studied Neolamprologus pulcher , group-living cichlid fish endemic Lake Tanganyika measured dominant subordinate individuals when they were either visible or concealed from one another. When could see each other, subordinates had lower maximum rates tended take longer recover following an exhaustive chase compared with dominants. In contrast, dominants did not These findings suggest that presence individual has negative consequences for subordinates, even in stable groups strong prosocial relationships.

Language: Английский

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Do Barn Swallow nestlings incur an oxidative cost of begging?

Journal of Ornithology, Journal Year: 2023, Volume and Issue: 165(1), P. 231 - 239

Published: July 6, 2023

Abstract Some theoretical models predict that nestling begging must be a costly activity to transmit reliable information parents about offspring hunger. One candidate cost is oxidative stress, which could impair growth or immune function. This hypothesis predicts nestlings in poor status should pay higher costs for given amount of begging, hence beg at lower rates similar degree To test this prediction, we experimentally induced transient alteration the Barn Swallow ( Hirundo rustica ) by administering them either single dose pro-oxidant substance (BSO) an antioxidant (vitamin E), and recorded their behaviour. Chicks treated with vitamin E increased hours following treatment. However, contrary BSO did not decrease compared controls. These inconsistent results are difficult explain performance mediated because chicks impaired (the group) begged same as Alternatively, may alleviate inhibitory effects on stress responses glucocorticoids. study suggests minor absent species. Future studies consider alternative explanations association between status, supplementation behaviour, particularly those involving

Language: Английский

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Manipulation of a social signal affects DNA methylation of a stress-related gene in a free-living bird

Journal of Experimental Biology, Journal Year: 2024, Volume and Issue: 227(15)

Published: July 18, 2024

Social status directly affects the health of humans and other animals. Low individuals receive more antagonistic encounters, have fewer supportive relationships worse outcomes. However, physiological cellular processes that mediate relationship between social environment are incompletely known. Epigenetic regulation hypothalamic-pituitary-adrenal (HPA) axis, neuroendocrine pathway activates in response to stressors, may be one process is sensitive environment. Here, we experimentally manipulated plumage, a key signal female tree swallows (Tachycineta bicolor) quantified methylation four genes HPA axis before after treatment. We found dulling white breast plumage affected gene, CRHR1; however, effect depended on original brightness bird. Methylation this gene was correlated with baseline corticosterone levels, suggesting DNA CRHR1 helps regulate glucocorticoid production species. two genes, FKBP5 GR, changed over course experiment, independent These results show these labile into adulthood suggest epigenetic could help birds respond current environmental conditions.

Language: Английский

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Social rank influences relationships between hormones and oxidative stress in a cichlid fish

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: Oct. 17, 2022

Abstract An individual’s social environment can have widespread effects on their physiology, including oxidative stress and hormone levels. Many studies posited that variation in experienced by individuals of different ranks might be due to endocrine differences, however, few evaluated this hypothesis. Here, we assessed whether a suite markers associated with tissues (blood, plasma, liver, or gonads) had rank-specific relationships circulating testosterone cortisol levels males cichlid fish, Astatotilapia burtoni . Across all blood DNA damage (a global marker stress) gonadal synthesis reactive oxygen species (as indicated NADPH-oxidase (NOX) activity) were lower when was high. High both the gonads high subordinates, but low dominants. Additionally, greater production (greater NOX (dominants only) liver subordinates). In general, across ranks, whereas dominants higher subordinates. Taken together, our results show differences lead contrasting between hormones stress.

Language: Английский

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Introduction to the Special Issue “Hormones and Hierarchies”

Hormones and Behavior, Journal Year: 2023, Volume and Issue: 148, P. 105299 - 105299

Published: Jan. 6, 2023

Language: Английский

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