Transition to siblinghood causes a substantial and long-lasting increase in urinary cortisol levels in wild bonobos.
early-life adversity
evolutionary biology
immature Pan paniscus
life history event
sibling birth
sibling rivalry
weaning
Journal
eLife
ISSN: 2050-084X
Titre abrégé: Elife
Pays: England
ID NLM: 101579614
Informations de publication
Date de publication:
30 08 2022
30 08 2022
Historique:
received:
20
01
2022
accepted:
29
08
2022
pubmed:
31
8
2022
medline:
23
9
2022
entrez:
30
8
2022
Statut:
epublish
Résumé
In animals with slow ontogeny and long-term maternal investment, immatures are likely to experience the birth of a younger sibling before reaching maturity. In these species, the birth of a sibling marks a major event in an offspring's early life as the older siblings experience a decrease in maternal support. The transition to siblinghood (TTS) is often considered to be stressful for the older offspring, but physiological evidence is lacking. To explore the TTS in wild bonobos, we investigated physiological changes in urinary cortisol (stress response), neopterin (cell-mediated immunity), and total triiodothyronine (T3, metabolic rate), as well as changes in behaviors that reflect the mother-offspring relationship. Following a sibling's birth, urinary cortisol levels of the older offspring increased fivefold, independent of their age, and remained elevated for 7 months. The cortisol level increase was associated with declining neopterin levels; however, T3 levels and behavioral measures did not change. Our results indicate that the TTS is accompanied by elevated cortisol levels and that this change does not coincide with nutritional weaning and attainment of physical independence. Our results suggest that bonobos and humans experience TTS in similar ways and that this developmental event may have emerged in the last common ancestor.
Identifiants
pubmed: 36040310
doi: 10.7554/eLife.77227
pii: 77227
pmc: PMC9489214
doi:
pii:
Substances chimiques
Triiodothyronine
06LU7C9H1V
Neopterin
670-65-5
Hydrocortisone
WI4X0X7BPJ
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2022, Behringer, Berghänel et al.
Déclaration de conflit d'intérêts
VB, AB, TD, SL, BF, GH No competing interests declared
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