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June 14th

6/14/2013

 
Picturewww.marionchonorscsj.com
On the news this morning, experts suggest the menopause and its side effects can all be blamed on men.

First proposed in the 1950s, the grandmother hypothesis stated that menopause, which stops a female's fertility well before the end of her lifespan, may have evolved to benefit a social group. Grandmothers played an important a role in caring for offspring that were already born.

The grandmother effect suggests that women lose their fertility at an age where they might not live to see a child grow, and instead are available to care for younger women's children. The menopause was therefore seen as the block to older women from continuing to reproduce.

Using computer modeling, a research team concluded preferential mating was the evolutionary answer. Men of all ages chose younger women as partners. That meant older women didn't need to be fertile.

But a UK expert said that was the wrong way round and men chose younger women because older women were less fertile, which gave rise to menopause.


Picturebaaaaabyanimals.livejournal.com

A grandmother effect link has been found in the behavior of whales and monkeys.

Scientists have discovered an evolutionary reason why humans and whales both have grandmothers. Scientists developed a mathematical model to study kinship dynamics in killer whales (orcas), short-finned pilot whales and humans. This revealed that, as post-menopausal females aged, they developed closer ties to infants.


Picturewww.macalester.edu
This showed an underlying similarity between whales and great apes that might otherwise have been masked by the big differences in their social structures. Researchers said the analysis can help explain why, of all long-lived social mammals, it is specifically among great apes and toothed whales that menopause and post-reproductive helping have evolved.

In Japan, two grandmother monkeys have been seen intervening to raise their own grandchildren, providing essential care including suckling in one instance where the grandmother was young enough. The scientists who witnessed the actions say it is the first unambiguous example of such behavior shown by a non-human primate. The observations were made in a free-ranging group of Japanese macaques. The group has been studied since 1958, so scientists have kept a record of the birth date and blood relationships of each individual.

Once again, experts' opinions differ about the reason for menopause. Do men choose younger women because older ones are less fertile? Or does their betrayal induce menopause? Maybe Mother Nature has a good reason for grandmothers to help in caring for the young.


Kathy Hadley link
6/14/2013 01:44:25 am

Very interesting theories. Whatever the reason, I think it works out well. Being a "some times" care giver at an older age is much easier than being a "full time" care giver.

:-)

Kathy

Francene Stanley link
6/14/2013 03:22:19 am

I only wish I had been close enough to give some care to my grandchildren. But I was on the other side of the world.

Author Bek Mugridge link
6/15/2013 05:57:24 pm

How fascinating reading about the grandmother effect and it makes so much sense, my mother is such a hands on grandmother to my two, it is wonderful, and yes she has been through menopause :)


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    Author

    Francene Stanley, author of many published novels. If you like my writing, why not consider purchasing one of my books? You'll see them on the sidebar below.
    Born in Australia, I moved to Britain half way through my long life.

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