Navigation Links
Small male chimps use politics, rather than aggression, to lead the pack, U of Minnesota study says
Date:2/2/2009

With most mammals, the biggest and most aggressive male claims the alpha male role and gets his choice of food and females. But a new study from the University of Minnesota suggests that at least among chimpanzees, smaller, more mild-mannered males can also use political behavior to secure the top position.

The finding was gleaned from 10 years of observing dominant male chimpanzees in Gombe National Park, Tanzania, looking at behaviors they used to compete for alpha male status relative to their size. Analysis showed that larger males relied more on physical attacks to dominate while smaller, gentler males groomed other chimpanzees, both male and female, to gain broad support.

The study focused on three alpha males who reigned between 1989 and 2003. Frodo, one of the largest and most aggressive male chimpanzees ever observed at Gombe, weighed 51.2 kg (112.6 lbs.) at his peak. He relied on his size and aggression to rule. While he allowed other chimpanzees to groom him, he seldom returned the favor. At the other end of the spectrum, Wilkie, who weighed only 37 kg (81.4 lbs.), obsessively groomed both male and female chimpanzees to maintain his top position. And Freud, who weighed 44.8 kg (98.6 lbs.), used a combination of the two strategies. (The average male chimp in Gombe weighs about 39 kg (85.8 lbs.).

The findings are reported in the February issue of the American Journal of Primatology. While it's widely known that grooming plays an important role in chimpanzee social interaction, this study is the first to show that it can be a strategy for achieving dominance.

Mark Foster, who was an undergraduate pursuing a bachelor of arts degree in anthropology and a B.F.A. in acting when the research was conducted, was the study's lead author of the study. As a recipient of a Katherine E. Sullivan Fellowship he later spent six months in Tanzania and Gombe and then became an educational assistant at the Lincoln Park Zoo in Chicago.

"Mark showed extraordinary creativity and tenacity in pulling together this study while still an undergraduate and then seeing it through to publication," said Anne Pusey, who was senior author. Pusey is director of the Jane Goodall Institute's Center for Primate Studies at the University of Minnesota and a University McKnight Distinguished Professor in the College of Biological Sciences' department of ecology, evolution and behavior (EEB).

Other collaborators included EEB graduate students Ian Gilby, who guided Foster in the initial outline of the question and in data extraction; Carson Murray, who guided data analysis; and Emily Wroblewski, who analyzed data on male dominance hierarchies. Statistics graduate student Alicia Johnson of the U of M Statistics Clinic guided the statistical analysis. Gilby is now a post-doctoral fellow at Harvard, and Murray a post-doctoral fellow at Lincoln Park Zoo.

"We were aware that Frodo was a bully and a stingy groomer, but we did not know how closely grooming patterns would correlate with body size," Pusey said. "We plan to study more alpha males to determine if grooming is a common strategy that small-bodied males use to placate rivals or cultivate cooperative alliances."


'/>"/>

Contact: Patty Mattern
mattern@umn.edu
612-624-2801
University of Minnesota
Source:Eurekalert

Related biology news :

1. CSHL scientists find a new class of small RNAs and define its function
2. Small changes can lead to big rewards, says ASN president
3. New study indicates smallpox vaccination effective for decades
4. Small satellite takes on large thunderstorms
5. Nanoparticles in the home: More and smaller than previously detected
6. Networks of small habitat patches can preserve urban biodiversity
7. Studies of small water fleas help ecologists understand population dynamics
8. When particles are so small that they seep right through skin
9. Exciting new companies at NJITs small biz incubator get 100K in grants
10. Exciting new companies at NJITs small biz incubator get 100K in lrants
11. Americas smallest dinosaur uncovered
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/24/2016)... Cercacor today introduced Ember TM Sport ... non-invasively measure hemoglobin, Oxygen Content, Oxygen Saturation, Perfusion ... in approximately 30 seconds. Smaller than a smartphone, using ... to key data about their bodies to help monitor ... Hemoglobin carries oxygen to muscles. When hemoglobin ...
(Date:11/17/2016)... Global Market Watch: Primarily supported by ownership types; ... Academics) market is to witness a value of US$37.1 billion ... Compounded Annual Growth Rate (CAGR) of 10.75% is foreseen from ... 2014-2020. North America is not way ... Europe at 9.56% respectively. Report Focus: ...
(Date:11/14/2016)... Technology, Inc. ("xG" or the "Company") (Nasdaq: XGTI, XGTIW), ... in challenging operating environments, announced its results for the ... a conference call to discuss these results on November ... Key Recent Accomplishments ... acquire Vislink Communication Systems. The purchase is expected to ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... ... December 02, 2016 , ... ... and biotechnology companies dedicated to collaboratively developing improved chemistry, manufacturing and control ... vendor-supported, portable online UHPLC, with robust, probe-based sampling. , Online liquid ...
(Date:12/2/2016)... --  SurePure, Inc. (OTCQB: SURP) a global leader ... concluded an agreement with Tamarack Biotics under which Tamarack ... acquire units of the Company,s patented photopurification technology with ... Concurrently with the option, SurePure has entered ... seek regulatory approvals in the United States ...
(Date:12/2/2016)... 2, 2016 /PRNewswire/ - bioLytical Laboratories, a world leader in rapid infectious disease tests, ... Pharmaceutical Association members. (Photo: http://photos.prnewswire.com/prnh/20161201/444905 ) ... ... , , ... Pharmaceutical Association (KPA) to introduce the INSTI HIV Self Test to 350 pharmacy representatives ...
(Date:11/30/2016)... , Nov. 30, 2016  GenomOncology today announced the appointment ... of Medical Affairs.  Dr. Coleman will oversee ... company,s proprietary knowledge-enabled platform. The GenomOncology software suite empowers molecular ... sequencing data and clinical decision support, from quality control through ... , , ...
Breaking Biology Technology: