Navigation Links
Fish can determine their social rank by observation alone, study finds

to hold territories and consequently descend in social status," the authors wrote. "Success in aggressive bouts is therefore crucial to male reproductive fitness, and the ability to infer the relative strength of rivals before engaging them in potentially costly fights should be highly adaptive."

When A. burtoni males fight, it's easy to spot the winner. Mature males have a menacing black stripe, or eyebar, on their face. After a fight, the winner retains his showy appearance, but the loser's eyebar temporarily disappears as he tries to flee his more aggressive opponent.

To test for transitive inference, the Stanford team took advantage of this reversible change in appearance by staging a series of short fights between male cichlids of equal size. In the experiment, fish that lost their eyebar during one-on-one combat were declared the loser.

After each bout, the loser was separated from his opponent and put back in his original tank. Within minutes, his eyebar returned, and he looked like all the other dominant males again.

Bystanders and rivals

The fights were staged in a square tank divided into several compartments. A lone male observer--the "bystander"--was placed in a cubicle in the center of the tank. Surrounding him were five smaller compartments, each with a solitary male rival identified simply as A, B, C, D and E. Researchers made sure that the bystander had never met any of his five potential rivals.

Although the bystander remained alone in his cubicle and never swam with the others, he was allowed to observe a series of fights between rival pairs--A vs. B, B vs. C, C vs. D, and D vs. E. Researchers manipulated the fights so that A would dominate B, B would dominate C, and so forth down the line.

"These fights, taken together, imply the dominance hierarchy A>B>C>D>E," the authors wrote. But did the bystander really comprehend this intricate pecking order, and if so, wo
'"/>

Source:Stanford University


Page: 1 2 3 4

Related biology news :

1. Newly-discovered class of genes determines ?and restricts ?stem cell fate
2. Biologists determine genetic blueprint of social amoeba
3. USC researchers determine mechanism of action of chemotherapy drug
4. Hidden sponges determine coral reefs nutrient cycle
5. Weapon performance determines mating success in the collared lizard
6. Scientists determine structure of enzyme that disrupts bacterial virulence
7. New technique helps researchers determine amino-acid charge
8. Researchers unlock how cells determine their functions
9. Researchers map out networks that determine cell fate
10. Genetic tug of war determines sexual differentiation
11. Structure determined for p53 tumor suppressor protein as bound to DNA for anti-cancer activity
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Fish can determine their social rank observation alone study finds

(Date:7/9/2014)... (July 9, 2014) Emerging fungal pathogens pose ... parasitic group, causing population declines of amphibians, bats, ... University of South Florida published in the prestigious ... acquire behavioral or immunological resistance to a deadly ... , "Acquired resistance is important because it ...
(Date:7/9/2014)... ill children with traumatic injuries have identified an ... to develop a hospital-acquired infection. The study, led ... online in June in the journal Shock ... could lead to the clinical implementation of quick-turnaround ... reverse immune system damage following critical illness or ...
(Date:7/9/2014)... the prevalence of antibiotic-resistant illness, Case Western Reserve ... disabling disease: blocking bacteria,s access to iron in ... siderophore, a small molecule, captures iron from two ... as well as how the body launches a ... appear in a recent edition of The ...
Breaking Biology News(10 mins):USF study: Amphibians can acquire resistance to deadly fungus 2Immune function predicts infection risk among child trauma patients 2Immune function predicts infection risk among child trauma patients 3Bacteria hijack plentiful iron supply source to flourish 2
... studying the reliability of species distribution models for ... have focused their research on the endangered marsupial, ... Ecography demonstrates that studying weather events, rather ... a clearer insight into the Bettong,s movements, range ...
... BRUNSWICK, N.J. The National Institutes of Health (NIH) ... quick and economical analysis of tissue from breast cancer ... a common form of breast cancer is likely to ... minimize side effects. The NIH made its grant ...
... Large, persistent populations of genetically engineered canola ... North Dakota. As genetically engineered crops become increasingly ... potential ecological side effects. A study published ... reports that genetically engineered canola endowed with ...
Cached Biology News:Australia's endangered bettong reveals how weather effects species distribution 2Rutgers-affiliated company receives funding for technology to help choose breast cancer treatments 2Rutgers-affiliated company receives funding for technology to help choose breast cancer treatments 3
(Date:1/15/2014)... The Microcompetition with Foreign DNA theory explains how latent ... viruses is the Epstein Barr Virus (EBV), and one of ... a chronic inflammatory disease that destroys the body’s joints. As ... have high concentrations of EBV DNA in their bodies (1). ...
(Date:1/15/2014)... TaiGen Biotechnology Company, Limited ("TaiGen") today announced that ... leading Russian pharmaceutical company, to develop and commercialize nemonoxacin ... , Turkey and other ... novel antibiotic for the treatment of bacterial infections including ...
(Date:1/14/2014)... BURLINGAME, Calif. , Jan. 14, 2014 As pet owners ... no doubt many of them wrote: "Take better care of my ... and even designer clothes and top-brand carrying cases to take the ... Pet parents might also feel compelled to buy some pricey toys ...
(Date:1/14/2014)... In recent years, growing suspicion about the ... development and promotion has led to unprecedented levels of ... concerns about the insidious impact of commercialization of research, ... to the world’s biggest pharmas for illegal marketing activities, ...
Breaking Biology Technology:Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 3
... XI,AN, China, Aug. 14 /Xinhua-PRNewswire-FirstCall/ -- Huifeng Bio-,Pharmaceutical ... and producer of plant extracts and pharmaceutical raw ... is pleased to,announce record sales and earnings for ... 2008., "In the first half of 2008, ...
... Life Sciences,Holdings, Inc. (Nasdaq: ADLS ), a ... of novel drugs in the,therapeutic areas of infection, ... for the second quarter ended June 30, 2008., ... loss for the three months was $3.4 million ...
... 14 /PRNewswire-FirstCall/ - Ondine Biopharma,Corporation (the "Company" ... medical,technology company developing photodisinfection based products, today,announced ... ended June 30, 2008., "During the ... clinical,progress with our photodisinfection technology and we ...
Cached Biology Technology:Huifeng Bio-Pharmaceutical (HFGB) Reports over $5 Million in Gross Sales; Record Results for the First Half of 2008 2Advanced Life Sciences Announces Second Quarter 2008 Financial Results 2Advanced Life Sciences Announces Second Quarter 2008 Financial Results 3Advanced Life Sciences Announces Second Quarter 2008 Financial Results 4Advanced Life Sciences Announces Second Quarter 2008 Financial Results 5Advanced Life Sciences Announces Second Quarter 2008 Financial Results 6Advanced Life Sciences Announces Second Quarter 2008 Financial Results 7Advanced Life Sciences Announces Second Quarter 2008 Financial Results 8Advanced Life Sciences Announces Second Quarter 2008 Financial Results 9Advanced Life Sciences Announces Second Quarter 2008 Financial Results 10Ondine Biopharma Announces Second Quarter 2008 Financial Results 2Ondine Biopharma Announces Second Quarter 2008 Financial Results 3Ondine Biopharma Announces Second Quarter 2008 Financial Results 4Ondine Biopharma Announces Second Quarter 2008 Financial Results 5Ondine Biopharma Announces Second Quarter 2008 Financial Results 6Ondine Biopharma Announces Second Quarter 2008 Financial Results 7Ondine Biopharma Announces Second Quarter 2008 Financial Results 8Ondine Biopharma Announces Second Quarter 2008 Financial Results 9Ondine Biopharma Announces Second Quarter 2008 Financial Results 10Ondine Biopharma Announces Second Quarter 2008 Financial Results 11Ondine Biopharma Announces Second Quarter 2008 Financial Results 12Ondine Biopharma Announces Second Quarter 2008 Financial Results 13Ondine Biopharma Announces Second Quarter 2008 Financial Results 14Ondine Biopharma Announces Second Quarter 2008 Financial Results 15Ondine Biopharma Announces Second Quarter 2008 Financial Results 16Ondine Biopharma Announces Second Quarter 2008 Financial Results 17