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:7/8/2015)... FRANKLIN LAKES , N.J. and NEW YORK ... and Company) and Guidepoint today announced ... selected start-up healthcare companies with free access to Guidepoint,s ... mentoring several start-ups that are developing cutting-edge technologies to ... of a dedicated Guidepoint research manager, each start-up entrepreneur ...
(Date:7/7/2015)... July 7, 2015  Based on its recent ... Sullivan recognizes Credence ID, LLC with the 2015 ... of the Year Award. Credence ID has developed ... its mission of offering enrollment and identification solutions ... Credence ID was formed by experts from the ...
(Date:7/2/2015)... , July 2, 2015 Fingerprint Cards ... FPC1035, FPC1145 and FPC1155 from the distributor World Peace Industrial ... FPC,s distributors in Asia . Deliveries are ... sensors will be used by smartphone manufacturers in ... included in the communicated revenue guidance of approximately 2,200 MSEK ...
Breaking Biology News(10 mins):BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 2BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 3Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 2Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 3Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 4Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 5FPC Receives Order for Touch Fingerprint Sensors of 268 MSEK 2
... one way to get children to eat more whole grains, ... Federal nutrition guidelines recommend at least three servings a day ... typically only eat about one serving per day, largely because ... In this study, researchers served graham snacks with four ...
... EAST LANSING, Mich. A Michigan State University researcher ... parkin may help nerve cells fight off damage from ... therapies for the degenerative ailment. John Goudreau, an ... Unit, believes parkin can rescue certain neurons from injury ...
... programmed cell death, is essential to normal development, ... process dramatically transforms cellular structures but the limitations ... this structural reorganization a mystery. , Now, in ... issue of Proceedings of the National Academy ...
Cached Biology News:Specific protein may help neurons fix themselves in Parkinson's patients 2How do cells die? Biophotonic tools reveal real-time dynamics in living color 2How do cells die? Biophotonic tools reveal real-time dynamics in living color 3
(Date:7/30/2015)... , July 30, 2015 AACC welcomed ... the 2015 AACC Annual Meeting & Clinical Lab ... July 26–30. The meeting showcased revolutionary advancements in ... ability of healthcare providers to diagnose patients quickly ... medical treatment. As of Wednesday, ...
(Date:7/30/2015)... Grenoble, France and Dallas, TX, USA (PRWEB) , ... ... ... manufacturer of innovative nano and microsystems, has appointed Francois Vieillard as Sales & ... & Marketing at executive positions, Francois Vieillard will be responsible for reinforcing Tronics’ ...
(Date:7/30/2015)... Washington , July 30, 2015 ... Market, by Product (Software, Molecular Modeling, PB/PK, PKPD, Trial ... Discovery & Development, Preclinical, Clinical Trial), by End Users ... Biosimulation Market is expected to reach USD 2,107.99 million ... a CAGR of 15.29%. Browse more ...
(Date:7/30/2015)... 2015   Aratana Therapeutics, Inc . (NASDAQ: ... on the licensing, development and commercialization of innovative ... its strategic partner VetStem Biopharma, Inc. has shared ... AT-016, an adipose-derived allogeneic stem cell product exclusively ... pain in dogs. The double-blinded, multi-site, ...
Breaking Biology Technology:Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 2Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 3Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 4Tronics appoints Francois Vieillard as Sales and Marketing Director 2Biosimulation Market Worth 2,107.99 Million USD by 2020 2Biosimulation Market Worth 2,107.99 Million USD by 2020 3Biosimulation Market Worth 2,107.99 Million USD by 2020 4Aratana Therapeutics Announces Positive Pilot Field Study for AT-016 2Aratana Therapeutics Announces Positive Pilot Field Study for AT-016 3Aratana Therapeutics Announces Positive Pilot Field Study for AT-016 4Aratana Therapeutics Announces Positive Pilot Field Study for AT-016 5
... for Biologically Inspired Engineering at Harvard University have developed ... seek out specific cell targets within a complex mixture ... as telling cancer cells to self-destruct. Inspired by the ... might one day be used to program immune responses ...
... ORLANDO, Fla., Feb. 16, 2012   GeneLink ... biotech company, has completed the sale of the ... Life Sciences, Inc. (GeneWize)  to Capsalus Corp. (OTCBB: ... and wellness marketplace.  As previously disclosed, GeneLink and ...
... -- FirstMark today announced the completion of the clinical ... These clinical results demonstrate the extraordinary effectiveness of the ... myocardial infarction and death in patients with suspected or ... final data was well received in an oral presentation, ...
Cached Biology Technology:Harvard's Wyss Institute develops DNA nanorobot to trigger targeted therapeutic responses 2Harvard's Wyss Institute develops DNA nanorobot to trigger targeted therapeutic responses 3GeneLink Biosciences Completes Sale of GeneWize Life Sciences 2FirstMark's Landmark Clinical Study Successfully Completed that Fulfills the Unmet Need to Access the Risk of Near Term MI 2
XEDAR Antibody...
Pharmalyte, narrow range pH 4.2-4.9, 25 ml. Category: Electrophoresis Systems & Standards & Reagents, Electrophoresis Standards and Reagents, Immobiline for IEF and Carrier Ampholytes....
...
...
Biology Products: