A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Differential grandparental investment when maternal grandmothers are living versus deceased
Tekijät: Tanskanen Antti O, Helle Samuli, Danielsbacka Mirkka
Kustantaja: The Royal Society Publishing
Kustannuspaikka: Lontoo
Julkaisuvuosi: 2023
Journal: Biology Letters
Tietokannassa oleva lehden nimi: BIOLOGY LETTERS
Lehden akronyymi: BIOL LETTERS
Artikkelin numero: 20230061
Vuosikerta: 19
Numero: 5
Sivujen määrä: 5
ISSN: 1744-9561
eISSN: 1744-957X
DOI: https://doi.org/10.1098/rsbl.2023.0061
Verkko-osoite: https://doi.org/10.1098/rsbl.2023.0061
Tiivistelmä
Grandparents can increase their inclusive fitness by investing time and resources in their grandchildren. However, not all grandparents make such investments equally, and between-grandparent differences in this regard can be predicted based on paternity uncertainty, lineage and grandparents' sex. Using population-based data for English and Welsh adolescents (n = 1430), we examined whether the death of the most important grandparent (in terms of investment), the maternal grandmother (MGM), changes relative support for existing hypotheses predicting differential grandparental-investment patterns. To contrast the predictions of the grandparental investment hypotheses, we used generalized order-restricted information criterion approximation. We consequently found that, when MGMs are alive, the most-supported hypothesis is 'discriminative grandparental solicitude', which ranks grandparental investment as MGMs > maternal grandfathers (MGFs) > paternal grandmothers (PGMs) > paternal grandfathers (PGFs). However, when MGMs are deceased, the paternity uncertainty hypothesis (MGFs = PGMs > PGFs) receives the most support; this is due to increased investment by PGMs. Thus, when the heaviest investors (i.e. MGMs) are deceased, PGM investments are closer to-but do not exceed-MGF investments.
Grandparents can increase their inclusive fitness by investing time and resources in their grandchildren. However, not all grandparents make such investments equally, and between-grandparent differences in this regard can be predicted based on paternity uncertainty, lineage and grandparents' sex. Using population-based data for English and Welsh adolescents (n = 1430), we examined whether the death of the most important grandparent (in terms of investment), the maternal grandmother (MGM), changes relative support for existing hypotheses predicting differential grandparental-investment patterns. To contrast the predictions of the grandparental investment hypotheses, we used generalized order-restricted information criterion approximation. We consequently found that, when MGMs are alive, the most-supported hypothesis is 'discriminative grandparental solicitude', which ranks grandparental investment as MGMs > maternal grandfathers (MGFs) > paternal grandmothers (PGMs) > paternal grandfathers (PGFs). However, when MGMs are deceased, the paternity uncertainty hypothesis (MGFs = PGMs > PGFs) receives the most support; this is due to increased investment by PGMs. Thus, when the heaviest investors (i.e. MGMs) are deceased, PGM investments are closer to-but do not exceed-MGF investments.
Turun yliopiston Tutkimustietojärjestelmän portaali