Scots scientists test the costs and benefits of sex

Stirling University use water fleas to prove sex helps next generation of species resist infection.

Water fleas: Scientists used the tiny creatures for their research.
Water fleas: Scientists used the tiny creatures for their research. Stirling University

Scots scientists have taken a new approach to test the costs and benefits of sex.

A team of experts from Stirling University discovered sex can help the next generation of species resist infection.

The theory has been difficult to test as most animals or organisms are either wholly sexual or clonal so cannot be compared easily.

Some animal and plant species can reproduce without sex, such as komodo dragons, starfish and bananas, but sex is still the dominant mode of reproduction in the natural world.

But using an insect that can reproduce both with and without sex - the water flea - researchers found sexually produced offspring were more than twice as resistant to infectious disease as their clonal sisters.

Dr Stuart Auld, of the university's Faculty of Natural Sciences, said: "One of the oldest questions in evolutionary biology is, why does sex exist when it uses up so much time and energy?

"Sex explains the presence of the peacock's tail, the stag's antlers and the male bird of paradise's elaborate dance.

"But if a female of any of these species produced offspring on her own, without sex, her offspring should come to dominate, while the other females watch the redundant males fighting and dancing.

"So, why are we not surrounded by clonal organisms?"

He explained: "By comparing clonal and sexual daughters from the same mothers, we found sexually produced offspring get less sick than offspring that were produced clonally.

"The ever-present need to evade disease can explain why sex persists in the natural world in spite of the costs."

The water fleas and their parasites were collected from the wild. Sexual and clonally produced daughters were harvested from the wild waterfleas and these offspring were exposed to the parasites under controlled laboratory conditions.

Download: The STV News app is Scotland's favourite and is available for iPhone from the App store and for Android from Google Play. Download it today and continue to enjoy STV News wherever you are.

One account. All of STV.

This field is required. That doesn't look like a valid e-mail format, please check. That e-mail's already in our system. Please try again.
ShowHide
Forgot password?
This field is required. At least 6 characters please. Did you enter your details correctly?
If you've forgotten your details then use the 'Forgot password?' link.
Need to reset your password?

We'll send a link to reset your password to

We've sent you details on how to reset your password

Please check your email and follow the instructions.

Forgotten your email address?

Have you forgotten the email address that you previously joined with? Don't worry, by emailing enquiries@stv.tv we can help.

One account. All of STV.

This field is required. Please enter at least 2 characters
This field is required. Please enter at least 2 characters
At least 6 characters please
ShowHide
This field is required. At least 6 characters please.
You have to be 16 or over to join
This field is required. This doesn't appear to be a valid date
Type your full postcode and select your address This field is required. It doesn't look like you've entered a valid postcode. Can't find your address? Confirm the details you've given us are correct by clicking here

By continuing you agree to our Terms of Use, including our Privacy Policy and Cookie Policy. Any issues contact us.

Upload Profile Picture

Please make sure your image is under 2mb in size and a valid JPG, PNG or GIF.

Are you sure?

Unfortunately, you'll be unable to access our premium content. We’ll be sorry to see you go, but if you change your mind you can rejoin us at any time.

Please verify your STV account

Please verify your STV account using the email we sent you. If you have lost the email, we can send you another one, just click the button below.

Thanks

We've sent you a new verification email.
Please check your email and follow the instructions to verify your account.

Welcome to STV
Thanks for joining us.

Oops!

Sorry, you must be at least 12 years old to place a vote for your Real Hero.

Please review our Voting Terms of Use for more information.

Oops!

Sorry! It seems that you are using a browser that is incompatible with our voting service.

To register your vote please copy the below URL in to your regular mobile browser. We recommend Google Chrome, or Safari.

http://shows.stv.tv/real-heroes/voting

Oops!

Sorry, you seem to have already voted in this category.

Thanks for voting

Now share your vote with friends on your social network

Share on twitter Share on facebook

Cast your vote

Please register or sign in to continue.

Cast your vote

This field is required. This doesn't appear to be a valid date

Cast your vote

Please fill out this form to cast your vote. As you are under 16 years old you will not create an STV account. Why do we need these details?

This field is required. Please enter at least 2 characters
This field is required. Please enter at least 2 characters
This field is required. That doesn't look like a valid e-mail format, please check.
Location This field is required.
Parental Consent This field is required.

That's you. All that's left is to click the 'Submit Vote' button below. By doing so, you confirm that you and your parent or guardian have read and accept our Voting Terms of Use, Privacy Policy and Cookie policy, and that the details you have entered are correct. We'll look after them as carefully as if they were our own.