Inbreeding in nature promotes promiscuity

Promiscuity may be nature's way of solving the problem of inbreeding, according to a new survey

Sex and Relationships, Marie Claire News
Sex and Relationships, Marie Claire News

Promiscuity may be nature's way of solving the problem of inbreeding, according to a new survey

Promiscuity in nature is considered to be a good thing, according to a new study. Through recent investigations, scientists have discovered that females who are promiscuous are simply solving the problem of inbreeding.

Researchers, who reported their findings in the journal Science, now believe they have found the reason why many females have several different mates, when in essence they only need one male to breed.

By mating with several different males, females who come from inbred groups are opening themselves up to a larger gene pool. This strategy enables them to screen the sperm they collect, then filter the one that is genetically less compatible.

Scientists from the University of East Anglia used flour beetles in an experiment to study these breeding patterns.

In regular populations they found the rate of breeding was identical, irrespective of the number of mates the females took. However, when they carried out the same test among inbred groups they noticed that the survival rate of the offspring was halved when the females only mated with one individual.

The university team then deliberately produced a group of inbred beetles, by breeding them with their close relatives, and watched the effects.

They noticed that they too began to mate more regularly and with several different suitors in order to combat the ill effects of inbreeding.

‘Exactly how females filter the most compatible sperm is not yet understood,’ said Professor Matthew Gage. ‘They might simply mate more frequently, and allow the ‘best sperm to win’, or they might choose to mate most with less related males, thereby concentrating their sperm stores from those males.’

Either way females were able to easily adapt their natural behaviour to boost their chances of healthy offspring.


Natalia Lubomirski
Natalia is a health journalist with 14 years experience in the publishing industry. She has worked for a number of well known magazines and websites including Marie Claire, Woman&Home, Top Sante, Boots and The Telegraph.  She likes to think she practices what she preaches when it comes to health and fitness. Her athletic prowess began early. A keen fencer for 13 years, she wielded an epée for Olympic Team GB during her teenage years. She likes to think she made sword-fighting cool before Game of Thrones came along! While working on her sporting performance with the team, she also participated in a lot of nutrition and psychology training, When it comes to time off, you’ll most likely find her up a mountain somewhere. It seems holidays have become a time for climbing several thousand feet, rather than chilling out. She’s now hiked eight of the major mountain ranges across four continents – including the Appalachians, the Smokies, the Sierra Nevadas (she spent her honeymoon hiking to the top of Half Dome), as well as hitting the summits of Snowdon, Pen-Y-Fan (Brecon Beacons), Table Mountain in South Africa, the Blue Mountains in Australia and the Atlas Mountains in Morocco. She’s also passionate about all things health, particularly vaccinations, and will happily jump on her soap box at any given opportunity to talk about their benefits to anyone who will listen!