Featured Research

from universities, journals, and other organizations

Laysan Albatross Employs 'Dual Mommies'

Date:
May 29, 2008
Source:
University of Hawaii at Manoa
Summary:
What's a girl to do if there's a shortage of males and she needs help raising a family? The Laysan albatross employs a strategy called reciprocity, where unrelated females pair together and take turns raising offspring.

Laysan albatross.
Credit: Dr. Eric Vanderwerf, Pacific Rim Conservation

What's a girl to do if there's a shortage of males and she needs help raising a family? The Laysan albatross employs a strategy called reciprocity, where unrelated females pair together and take turns raising offspring.

On the island of Oahu, in Hawaii, 31% of nests are female-female pairs. Female pairs raise fewer chicks than male-female pairs, but given the shortage of males, fewer chicks are better than none. Since albatross can only raise one chick each year, females stay together for multiple years for each to reproduce. This unusual strategy may explain why Laysan Albatross are successfully re-colonizing islands.

Unrelated same-sex individuals pairing together and cooperating to raise offspring over many years is a rare occurrence in the animal kingdom. Cooperative breeding, in which animals help raise offspring that are not their own, is often attributed to kin selection when individuals are related, or altruism when individuals are unrelated.

The study documents long-term pairing of unrelated female Laysan albatross (Phoebastria immutabilis) and shows how cooperation may have arisen as a result of a skewed sex ratio in this species. Thirty-one percent of Laysan albatross pairs on Oahu were female-female, and the overall sex ratio was 59% females as a result of female-biased immigration.

Female-female pairs fledged fewer offspring than male-female pairs, but this was a better alternative than not breeding. In most female-female pairs that raised a chick in more than 1 year, at least one offspring was genetically related to each female, indicating that both females had opportunities to reproduce. These results demonstrate how changes in the sex ratio of a population can shift the social structure and cause cooperative behavior to arise in a monogamous species, and they also underscore the importance of genetically sexing monomorphic species.


Story Source:

The above story is based on materials provided by University of Hawaii at Manoa. Note: Materials may be edited for content and length.


Journal Reference:

  1. Young LC, Zaun BJ, VanderWerf EA . Successful same sex pairing in Laysan Albatross. Biology Letters, DOI: 10.1098/rsbl.2008.0191

Cite This Page:

University of Hawaii at Manoa. "Laysan Albatross Employs 'Dual Mommies'." ScienceDaily. ScienceDaily, 29 May 2008. <www.sciencedaily.com/releases/2008/05/080528095835.htm>.
University of Hawaii at Manoa. (2008, May 29). Laysan Albatross Employs 'Dual Mommies'. ScienceDaily. Retrieved October 2, 2014 from www.sciencedaily.com/releases/2008/05/080528095835.htm
University of Hawaii at Manoa. "Laysan Albatross Employs 'Dual Mommies'." ScienceDaily. www.sciencedaily.com/releases/2008/05/080528095835.htm (accessed October 2, 2014).

Share This



More Plants & Animals News

Thursday, October 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dolphins and Turtles Under Threat in Pakistan

Dolphins and Turtles Under Threat in Pakistan

AFP (Oct. 2, 2014) — The turtles and Dolphins of Pakistan's Indus river - both protected by law - are in a fight for their survival as man's activities threatens their futures. Duration: 02:29 Video provided by AFP
Powered by NewsLook.com
'Harvest Break' Endures in Maine Potato Fields

'Harvest Break' Endures in Maine Potato Fields

AP (Oct. 2, 2014) — Educators and farmers are clinging to a tradition aimed at giving farmers much-needed help in getting potatoes out of the fields and into storage before the ground freezes in the nation's northeast corner. (Oct. 2) Video provided by AP
Powered by NewsLook.com
Attacking Superbugs

Attacking Superbugs

Ivanhoe (Oct. 1, 2014) — Two weapons hospitals can use to attack superbugs. Scientists in Ireland created a new gel resistant to superbugs, and a robot that can disinfect a room in minutes. Video provided by Ivanhoe
Powered by NewsLook.com
Cultural Learning In Wild Chimps Observed For The First Time

Cultural Learning In Wild Chimps Observed For The First Time

Newsy (Oct. 1, 2014) — Cultural transmission — the passing of knowledge from one animal to another — has been caught on camera with chimps teaching other chimps. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins