Online:
Visits:
Stories:
Profile image
Story Views

Now:
Last Hour:
Last 24 Hours:
Total:

Why orcas go through menopause

Friday, January 13, 2017 17:27
% of readers think this story is Fact. Add your two cents.

(Before It's News)

Image of an orca and her calf from Wikimedia Commons

Orcas are one of only three species of mammals that go through menopause, including humans of course. A new study published in Current Biology may have discovered why this happens in killer whales.

Examination of 43 years worth of data collected by the Center for Whale Research and Fisheries and Oceans Canada, revealed a remarkable finding about the costs of reproduction in orcas. Older mothers tend to spend more time taking care of the family, so to speak, by making sure her offspring know where or when to find food. While this cooperative foraging behavior helps improve survival of the mother’s family, further offspring from the mother are 1.7 times more likely to die than her daughter’s offspring. This reproductive competition (or conflict) is thought to be a reason why the whales (and perhaps humans) evolved to go through menopause.

Source:

DP Croft, RA Johnston, S Ellis, S Nattrass, DW Franks, LJN Brent, S Mazzi, KC Balcomb, JKB Ford, MA Cant. Reproductive Conflict and the Evolution of Menopause in Killer. Current Biology. 27: 1-7, 2017. DOI: 10.1016/j.cub.2016.12.015



Source: http://scienceblogs.com/lifelines/2017/01/13/why-orcas-go-through-menopause/

Report abuse

Comments

Your Comments
Question   Razz  Sad   Evil  Exclaim  Smile  Redface  Biggrin  Surprised  Eek   Confused   Cool  LOL   Mad   Twisted  Rolleyes   Wink  Idea  Arrow  Neutral  Cry   Mr. Green

Top Stories
Recent Stories
 

Featured

 

Top Global

 

Top Alternative

 

Register

Newsletter

Email this story
Email this story

If you really want to ban this commenter, please write down the reason:

If you really want to disable all recommended stories, click on OK button. After that, you will be redirect to your options page.