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:4/17/2014)... that devastate honeybees in Europe, Asia and the United ... appear to be impacting native honeybee populations at this ... invasive pests include including Nosema microsporidia and ... to be resilient to these invasive pests, which suggests ... in Europe, Asia and the United States currently are ...
(Date:4/17/2014)... France have hit on a novel method to ... correct and most effective treatment possible., Kidney stones ... and developing world. If left untreated, apart from ... failure and other complications. In many patients treated ... a more effective pathological approach to diagnosis and ...
(Date:4/17/2014)... IPCC meeting painted a stark warning on the possible ... a greenhouse effect 32 times that of carbon dioxide. ... humic substances act as fully regenerable electron acceptors which ... in wetlands instead of being released to the atmosphere. ... disrupted it may enter into a vicious cycle to ...
Breaking Biology News(10 mins):East African honeybees are safe from invasive pests… for now 2East African honeybees are safe from invasive pests… for now 3Methane climate change risk suggested by proof of redox cycling of humic substances 2
... Researchers from the University of Georgia College of ... that could open new avenues for treating Ichthyophthirius ... that commonly attacks freshwater fish. With the ... harbors two apparently symbiotic intracellular bacteria: Bacteroides, ...
... turns out that wearing a cap is good for you, ... from the Johns Hopkins Engineering in Oncology Center have shown ... holds the cell,s nucleus, its genetic storehouse, in its proper ... the researchers say, could provide clues to the diagnosis and ...
... Calif., Dec. 2 DigitalPersona, Inc., a leader in ... with IBM to deploy a new model of its ... systems. The DigitalPersona U.are.U® 4500HD offering allows point-of-sale applications ... specific transactions can be linked to the individuals who ...
Cached Biology News:UGA researchers lead team in discovery involving devastating freshwater fish parasite, 'Ich' 2UGA researchers lead team in discovery involving devastating freshwater fish parasite, 'Ich' 3A cell's 'cap' of bundled fibers could yield clues to disease 2DigitalPersona Fingerprint Sensor Technology Ships on IBM SurePOS 500 Retail Systems 2
(Date:1/15/2014)... January 15, 2014 A study has been ... the Formula 1 track could help to tackle the problem ... (MAT), Stowhealth (a GP surgery based in Stowmarket) and academics ... Simplyhealth. Telemetry technology, which is inspired by equipment ...
(Date:1/15/2014)... Rochester, NY (PRWEB) January 15, 2014 The ... cause a major disease. One of these latent viruses is ... is rheumatoid arthritis (RA). Rheumatoid arthritis (RA) is a chronic ... the theory, a study found that RA patients have high ...
(Date:1/15/2014)... Freeslate, Inc ., the leading ... Lupin Limited, one of India’s top five pharmaceutical companies, ... System for high throughput solid form screening. ... a wide range of quality, affordable generic and branded ...
(Date:1/14/2014)... (PRWEB) January 14, 2014 Date: Friday, April ... Location: Warrington Country Club, 1360 Almshouse Road, Warrington, Pa. ... nonprofit organization solely dedicated to finding a cure for hepatitis ... worldwide, will host its annual Crystal Ball on Friday, April ...
Breaking Biology Technology:Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4Study: 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 3Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2
... As open ... at leading industry events. , ... Washington, DC (PRWEB) June 11, 2010 -- Open source software will be a featured topic ... Meeting is the premier event for professionals involved in the discovery, development, and life ...
... 11 PRA International, a leading Clinical Research Organization, is exhibiting ... 15th congress in Barcelona 10-13 June 2010 . , ... At PRA,s booth (#202), conference ... M.D., to discuss the key issues and latest developments in hematology drug ...
... , FORT WORTH, Texas , ... of a new educational module "Exploring Biofilms," an,accredited, online course designed ... play in chronic wound infections. , ... "Bacterial biofilms are a ...
Cached Biology Technology:Open Source Clinical Trials Software Featured at the 46th DIA Annual Meeting 2Open Source Clinical Trials Software Featured at the 46th DIA Annual Meeting 3PRA International Exhibits at European Hematology Association Congress 2The Wound Institute(R) Launches Educational Course on Bacterial Biofilms 2The Wound Institute(R) Launches Educational Course on Bacterial Biofilms 3The Wound Institute(R) Launches Educational Course on Bacterial Biofilms 4
Immunogen: VDAC3 Protein Storage: -20 C, Avoid Freeze/Thaw Cycles...
TRBP1 Antibody...
Complete cell culture media with cytokines...
Collected from sexually mature, mixed sex, mixed breed cats. Physiochemical constituents are measured to ensure lot-to-lot consistency....
Biology Products: