Do Grandfathers Help Their Grandchildren?
Author Information
Author(s): Lahdenperä M, Russell A.F, Lummaa V
Primary Institution: University of Turku
Hypothesis
Does male lifespan influence fitness through grandfathering in historical Finns?
Conclusion
Men do not gain extra fitness through grandfathering, as their presence has little impact on offspring reproductive success.
Supporting Evidence
- Father presence reduced the age at first reproduction of offspring by an average of 2.3 years.
- Father presence shortened inter-birth intervals by 2.6 months.
- Men's longevity did not influence the number of grandchildren born to them.
Takeaway
The study looked at whether grandfathers help their grandchildren. It found that grandfathers don't really make a difference in how many grandchildren men have.
Methodology
The study used historical church records to analyze the reproductive histories of men and their offspring in pre-industrial Finland.
Potential Biases
Potential biases may arise from the reliance on historical records and the specific cultural context of the study population.
Limitations
The study is limited to a strictly monogamous society and may not generalize to other mating systems.
Participant Demographics
The study focused on pre-industrial Finnish men who married only once.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website