Costly lifetime maternal investment in killer whales.
Curr Biol
; 33(4): 744-748.e3, 2023 02 27.
Article
en En
| MEDLINE
| ID: mdl-36758545
ABSTRACT
Parents often sacrifice their own future reproductive success to boost the survival of their offspring, a phenomenon referred to as parental investment. In several social mammals, mothers continue to improve the survival of their offspring well into adulthood;1,2,3,4,5 however, whether this extended care comes at a reproductive costs to mothers, and therefore represents maternal investment, is not well understood. We tested whether lifetime maternal care is a form of parental investment in fish-eating "resident" killer whales. Adult killer whales, particularly males, are known to receive survival benefits from their mothers;3 however, whether this comes at a cost to mothers' reproductive success is not known. Using multiple decades of complete census data from the "southern resident" population, we found a strong negative correlation between females' number of surviving weaned sons and their annual probability of producing a viable calf. This negative effect did not attenuate as sons grew older, and the cost of sons could not be explained by long-term costs of lactation or group composition effects, supporting the hypothesis that caring for adult sons is reproductively costly. This is the first direct evidence of lifetime maternal investment in an iteroparous animal, revealing a previously unknown life history strategy.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Orca
Tipo de estudio:
Health_economic_evaluation
Límite:
Animals
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Female
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Humans
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Male
Idioma:
En
Revista:
Curr Biol
Asunto de la revista:
BIOLOGIA
Año:
2023
Tipo del documento:
Article