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Feast or fancy? Black widows shake for love

Date:
January 17, 2014
Source:
Simon Fraser University
Summary:
Biologists have found that courting male black widow spiders shake their abdomens to produce carefully pitched vibrations and avoid potential attacks by females -- who otherwise may misinterpret the advances as the vibrations of prey.

Black widow and fly.
Credit: Sean McCann

A team of Simon Fraser University biologists has found that male black widow spiders shake their abdomens to produce carefully pitched vibrations that let females know they have "come a-courting" and are not potential prey.

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The team's research has just been published in the open access journal Frontiers in Zoology.

SFU graduate students Samantha Vibert and Catherine Scott, working with SFU biology professor Gerhard Gries, recorded the vibrations made by male black widow spiders (Latrodectus hesperus), hobo spiders (Tegenaria agrestis) and prey insects.

Scott explains: "The web functions as an extension of the spider's exquisitely tuned sensory system, allowing her to very quickly detect and respond to prey coming into contact with her silk.

"This presents prospective mates with a real challenge when they first arrive at a female's web: they need to signal their presence and desirability, without triggering the female's predatory response."

The researchers found that the courtship vibrations of both species differed from those of prey, but that the very low-amplitude vibratory signals produced when male black widows shake their abdomens were particularly distinctive. "These 'whispers' may help to avoid potential attacks from the females they are wooing," explains Scott.

Simon Fraser University is consistently ranked among Canada's top comprehensive universities and is one of the top 50 universities in the world under 50 years old. With campuses in Vancouver, Burnaby and Surrey, B.C., SFU engages actively with the community in its research and teaching, delivers almost 150 programs to more than 30,000 students, and has more than 125,000 alumni in 130 countries.


Story Source:

The above story is based on materials provided by Simon Fraser University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Samantha Vibert, Catherine Scott, Gerhard Gries. A meal or a male: the 'whispers' of black widow males do not trigger a predatory response in females. Frontiers in Zoology, 2014; 11 (1): 4 DOI: 10.1186/1742-9994-11-4

Cite This Page:

Simon Fraser University. "Feast or fancy? Black widows shake for love." ScienceDaily. ScienceDaily, 17 January 2014. <www.sciencedaily.com/releases/2014/01/140117153742.htm>.
Simon Fraser University. (2014, January 17). Feast or fancy? Black widows shake for love. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2014/01/140117153742.htm
Simon Fraser University. "Feast or fancy? Black widows shake for love." ScienceDaily. www.sciencedaily.com/releases/2014/01/140117153742.htm (accessed December 22, 2014).

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