Navigation Links
Bigger, scarier weapons help spiders get the girl
Date:12/12/2011

DURHAM, N.C. If you're a red-headed guy with eight bulging eyes and a unibrow, size does indeed matter for getting the girl.

More specifically, the bigger a male jumping spider's weapons appear to be, the more likely his rival will slink away without a fight, leaving the bigger guy a clear path to the waiting female.

Duke University graduate student Cynthia Tedore, working with her dissertation advisor, visual ecologist Snke Johnsen, wanted to know what visual signals matter most to magnolia green jumping spiders, which have an impressive array of eyes, including two giant green ones that face forward.

Vision is clearly important to these quarter-inch animals, which can be "very predaceous and aggressive," when love is in the air.

Tedore's lab in the basement of Duke's biological sciences building is lined with wire shelves covered with row after row of Lucite boxes, each holding an individual chartreuse jumping spider. Full-spectrum lights and squares of green paper mimic sunlight and leaves to keep the spiders calm between bouts. They're fed leftover fruit flies from other labs.

In pairs, 24 males squared off for 10 minutes in "the arena," a box festooned with female silk to put the males in a fighting frame of mind. Over the course of 68 of these cage matches, the male with the bigger chelicerae, heavy, bristling fangs hanging in front of their mouth parts, usually scared the other guy off without a fight.

"The males wave their forelegs at each other for a period, and then the smaller male runs off," Tedore said. "That's why we think they're using vision to size each other up. Most of the time, the smaller one will run away before it comes to blows."

On the rare occasion that a male with smaller weapons won, he tended to have chelicerae which were less red. That's the opposite of what Tedore expected, and she's not sure what the color differences are about. It may be that the spiders who in
'/>"/>

Contact: Karl Leif Bates
karl.bates@duke.edu
919-681-8054
Duke University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Evolution drives many plants and animals to be bigger, faster
2. New materials capability to increase weapons explosive force demonstrated at Navy test range
3. Protein microarrays may reveal new weapons against malaria
4. Rutgers, UMDNJ receive $23 million to develop antidotes for chemical weapons attacks
5. Native ants use chemical weapons to turn back invading Argentine ants
6. Engineering new weapons in the fight against juvenile diabetes
7. Search for weapons of mass destruction expands to East Africa
8. Zooming in on the weapons of Salmonella
9. New medical weapons to protect against anthrax attacks
10. Multifunctional polymer neutralizes both biological and chemical weapons
11. Lombardi research: Monoclonal antibodies primed to become potent immune weapons against cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/10/2014)... a leader in performance biometric data sensor technology, today ... licensees for highly accurate, clinically validated biometric technology. This ... fitness and health sectors, but first responders/military and gaming ... as useful as the biometric data it delivers. As ...
(Date:12/10/2014)... CIE San Diego has launched an innovative trust network and ... coordination among social service and care providers by enabling them ... grant from the Alliance Healthcare Foundation to expand to organizations ... a "Live Well San Diego" partner on December 11 th ...
(Date:12/10/2014)... California , December 9, 2014 ... ITN,s BCARD Platform   ... enterprise meeting scheduling solutions for business-to-business (B2B) events, ... world leader in mobile near-field communication (NFC), Bluetooth ...
Breaking Biology News(10 mins):Wearable Technology Products Demand Highly Accurate Biometric Technology 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 2Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 3
... black, brittle and freeze-dried (just like the ice cream ... Designed by Northwestern University chemists, it can remove mercury ... and, perhaps most impressive of all, is a more ... sulfur out of crude oil. Hydrodesulfurization might be ...
... have broken the stubborn impasse that has frustrated the ... approach that bypasses the usual path followed by vaccine ... that block infection, the scientists protected monkeys from infection ... virus, or SIVthat causes AIDS in rhesus monkeys. ...
... professor of medicine, physiology and biophysics at the Boston ... of vitamin D and its role in disease prevention, ... Health Research. The prize was presented at a ... Linus Pauling Institute at Oregon State University. It recognizes ...
Cached Biology News:One sponge-like material, three different applications 2One sponge-like material, three different applications 3Novel vaccine approach offers hope in fight against HIV 2Vitamin D expert receives Linus Pauling Prize for Health Research 2
(Date:1/22/2015)... Boulder, CO / Rootstown, OH (PRWEB) January 22, 2015 ... sensitive detection platform, announced today that it has received AOAC-PTM ... O26, O45, O1O3, O111, O121, and O145; collectively referred to ... (E. coli) O157, at 1 colony forming unit (cfu) per ...
(Date:1/22/2015)... 2015 Controlled Substance Compliance Services (CSCS), ... companies check the legal requirements around using controlled substances ... , As their international operations expand and become ... solutions built as a result of the first phase ...
(Date:1/22/2015)... Jan. 22, 2015   Cypher Genomics, Inc., ... (NASDAQ: SQNM ), the leading molecular ... next generation noninvasive prenatal tests (NIPT). Through this ... called Mantis™, to advance analysis of clinically-relevant fetal ...
(Date:12/25/2014)... The report “Service Quality Management and Telco Customer ... - Global Advancements, Worldwide Forecasts & Analysis (2014-2019)” defines ... forecasting of revenues. , Browse 152 market data ... TOC on “Service Quality Management (SQM) and Telco Customer ...
Breaking Biology Technology:Crystal Diagnostics Awarded AOAC-PTM Accreditation for the Rapid Detection of “Big 6” E.coli Food Pathogens 2Global Compliance Service for Controlled Substances to Expand to China 2Cypher Genomics and Sequenom Announce Development Agreement 2Cypher Genomics and Sequenom Announce Development Agreement 3Cypher Genomics and Sequenom Announce Development Agreement 4Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 2Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 3Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 4
... Reading, School of Pharmacy have developed an important new technique ... birth and prenatal mortality. The findings are published in the ... , Dr Che Connon, a Research Councils UK Fellow in ... X-ray beam to examine tiny structures within the protective sac ...
... 9.45am (EST):, "CYT006-AngQb, a Vaccine Against Hypertension Targeting Angiotensin II, ... Blood Pressure.", The American Heart Association Publishes Today an Independent News Release ... ... Confirmed: no, Vaccine-Related Adverse Events Reported in 12 Months Follow-Up ...
... of Siemens Medical Solutions Diagnostics, ERLANGEN, ... the acquisition of Dade Behring Holdings, Inc. ... of Siemens,Medical Solutions Diagnostics. As the market ... of in vitro diagnostics, Siemens now can ...
Cached Biology Technology:Synchrotron radiation illuminates how babies' protective bubble bursts 2Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 2Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 3Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 4Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 5Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 6Presentation of Phase IIa Results for Cytos Biotechnology's Hypertension Vaccine at the American Heart Association Scientific Sessions 2007 7Siemens Completes Acquisition of Dade Behring 2Siemens Completes Acquisition of Dade Behring 3
... The Jouan RC10 series of vacuum ... product protection features allied to rapid and ... modules can be combined with oil-free or ... traps and a wide selection of rotors ...
...
... MB (For small quantities of solvents with ... vacuum concentrator/centrifugal evaporator systems respond to specific ... rapid and safe concentration of heat-labile samples. ... pumps, different of cold traps and a ...
... MBS Start up kit. Includes configured Laptop ... of 1 MultiBlock satellite thermal Cycler ... User friendly software. Store/track run ... heated lid. Outstanding uniformity. Advanced ...
Biology Products: