It is common for
parents to influence mate choice -- from arranged marriages to more subtle
forms of persuasion -- but they often disagree with their children about what
makes a suitable partner. A new study has found an evolutionary explanation for
why some parents try to control who their children pair up with.
The study, involving a
University of Bristol researcher and published today in the journal Evolution
& Human Behavior, shows that this conflict over mate choice may
be rooted in an evolutionary conflict over resources.
Dr Tim Fawcett, a research
fellow in Bristol's School of Biological Sciences, teamed up with scientists at
the University of Groningen to investigate how the mate preferences of parents
and children co-evolve. They found that parents tend to give more resources to
children whose partners provide less support, and that this leads to a conflict
over mate choice.
The team built a computer
model to simulate the evolution of parental behaviour when their daughter is
searching for a partner. The model shows that, typically, parents should prefer
a son-in-law who is more caring and supportive than their daughter would
otherwise choose.
Dr Fawcett said: "The
conflict over parental resources is central to understanding why parents and
children disagree in mate choice."
The model predicts that,
when parents distribute resources equally among their children, their mate
preferences should coincide exactly. But when parents contribute more to
children whose partners invest less, a conflict arises.
Dr Fawcett explained:
"Parents are equally related to all of their children, whereas children
value themselves more than their siblings -- so each child wants to get more
than their fair share of parental resources." This means that the children
are willing to settle for a mate who is less caring than their parents would
ideally like.
The new theory, if
correct, sheds light on an intriguing aspect of human behaviour and may help to
explain patterns of variation across cultures. Piet van den Berg, lead author
on the study, said: "Our model predicts that the conflict will be stronger
when fathers rather than mothers control resources, but this remains to be
tested."
In
future work, the scientists plan to investigate preferences for different
aspects of quality. "Surveys show that children tend to place more
importance on physical attractiveness, smell and sense of humour, whereas
parents care more about social class and family background," said Mr van
den Berg. "We don't yet understand the reason for this difference, but it
probably has something to do with our evolutionary history.
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