Featured Research

from universities, journals, and other organizations

Evolution Of Animal Personalities

Date:
May 30, 2007
Source:
Santa Fe Institute
Summary:
Animals differ strikingly in character and temperament. Yet only recently has it become evident that personalities are a widespread phenomenon in the animal kingdom. Animals as diverse as spiders, mice and squids appear to have personalities. Personality differences have been described in more than 60 species, including primates, rodents, birds, fish, insects and mollusks.

Animals differ strikingly in character and temperament. Yet only recently has it become evident that personalities are a widespread phenomenon in the animal kingdom. Animals as diverse as spiders, mice and squids appear to have personalities. Personality differences have been described in more than 60 species, including primates, rodents, birds, fish, insects and mollusks.

New work by Max Wolf (University of Groningen; currently at the Santa Fe Institute), Santa Fe Institute Postdoctoral Fellow Sander van Doorn, Franz Weissing (University of Groningen), and Olof Leimar (Stockholm University) offers an explanation for the evolution of animal personalities.

The evolutionary origins of "animal personality"--defined as consistent behavior over time and in different situations--is poorly understood. Why do different personality types exist within a single population given that, at first sight, one would expect one type to be more successful than another? Why are individuals not more flexible considering that personality rigidity sometimes leads to seemingly inefficient behavior? Why do we find the same types of traits correlated with each other in very different kinds of animals?

The authors argue that in many cases personalities are shaped by a simple underlying principle: the more an individual stands to lose (in terms of future reproduction) the more cautiously it is likely to behave, in all kinds of situations and consistently over time.

They begin with two basic observations. First, variation in personalities is often structured according to differences in the overall willingness to take risks. Second, individuals are often confronted with a trade-off between current and future reproduction: the more an individual currently invests in reproduction, the less resources are left to invest in future opportunities, and vice versa.

Using a mathematical model the authors demonstrate that this fundamental trade-off can give rise to populations where some individuals put more emphasis on future reproduction than others. Individuals who invest in future reproductive success evolve to be consistently risk-averse in different behavioral contexts (e.g. encounters with predators and aggressive interactions), whereas individuals who put emphasis on current reproductive success evolve a more risk-prone personality.

The researchers intend to continue their collaborative work on the evolution of animal personalities. Currently, at the Santa Fe Institute, Max Wolf and Sander van Doorn are developing alternative ideas on structuring properties of personalities.

These findings are detailed in "Life-history trade-offs favour the evolution of animal personalities" in the May 31 issue of Nature.


Story Source:

The above story is based on materials provided by Santa Fe Institute. Note: Materials may be edited for content and length.


Cite This Page:

Santa Fe Institute. "Evolution Of Animal Personalities." ScienceDaily. ScienceDaily, 30 May 2007. <www.sciencedaily.com/releases/2007/05/070530132400.htm>.
Santa Fe Institute. (2007, May 30). Evolution Of Animal Personalities. ScienceDaily. Retrieved April 25, 2014 from www.sciencedaily.com/releases/2007/05/070530132400.htm
Santa Fe Institute. "Evolution Of Animal Personalities." ScienceDaily. www.sciencedaily.com/releases/2007/05/070530132400.htm (accessed April 25, 2014).

Share This



More Plants & Animals News

Friday, April 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Fungus Killing Bats, Spreading in US

Deadly Fungus Killing Bats, Spreading in US

AP (Apr. 24, 2014) A disease that has killed more than six million cave-dwelling bats in the United States is on the move and wildlife biologists are worried. White Nose Syndrome, discovered in New York in 2006, has now spread to 25 states. (April 24) Video provided by AP
Powered by NewsLook.com
Blood From World's Oldest Woman Suggests Life Limit

Blood From World's Oldest Woman Suggests Life Limit

Newsy (Apr. 24, 2014) Scientists say for the extremely elderly, their stem cells might reach a state of exhaustion. This could limit one's life span. Video provided by Newsy
Powered by NewsLook.com
Raw: Kangaroo Rescued from Swimming Pool

Raw: Kangaroo Rescued from Swimming Pool

AP (Apr. 24, 2014) A kangaroo was saved from drowning in a backyard suburban swimming pool in Australia's Victoria state on Thursday. Australian broadcaster Channel 7 showed footage of the kangaroo struggling to get out of the pool. (April 24) Video provided by AP
Powered by NewsLook.com
Could Marijuana Use Lead To Serious Heart Problems?

Could Marijuana Use Lead To Serious Heart Problems?

Newsy (Apr. 24, 2014) A new study says marijuana use could lead to serious heart-related complications. 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:
from the past week

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