Navigation Links
The best both of worlds -- how to have sex and survive
Date:9/20/2007

Researchers have discovered that even the gruesome and brutal lifestyle of the Evarcha culicivora, a blood gorging jumping spider indigenous to East Africa, cant help but be tempted by that big is beautiful mantra no matter what the costs. A study recently published in Ethology found that despite the inherent risk of sexual cannibalism, virgin females were attracted to bigger males when losing their virginity before opting for the safer smaller male as a longer term mate choice.

It is quite common for male spiders to fall victim to female sexual partners once they have mated as the female is more often than not bigger than her mate. In the case of E. culicivora, the gender roles and the size ranges of both sexes are different from the norm and this is important in understanding the evolution of their mate choice behaviour. Large males are more cannibalistic towards smaller females than vice versa. Consequently, virgin females prefer larger males as mates, in spite of the increased risk of cannibalism, but once the females have mated they change tact and prefer smaller males. In contrast, males make the same choice regardless of whether they are virgins or not and prefer larger females as mates overall.

The research team based in New Zealand and Kenya used interesting techniques to ensure that their findings were based purely on size selection and not courtship behaviour. Dr Pollard explained like all salticids, E. culicivora has exceptional eyesight that is unrivalled by other animals of a similar size. Because E. culicivora can see so well, we could test what size mates virgin and non virgin males and females preferred by showing them different sized, dead conspecifics arranged in life-like postures. These motionless mounts were coated with a plastic adhesive and allowed us to test for decisions based only on the size of the potential mate and not its behaviour. To check whether the decisions made with static models related to actual mating, we also repeated the experiment with the choice being live mates.

Despite being the smaller and in this case weaker sex, the female E. culicivora has employed some interesting tactics in mate selection. Whilst this study suggests she may only mate once with a larger male, unlike male E. culicivora which discriminates less stringently, the research would suggest that her motives for doing so still remain largely unknown. Moreover this study provides the first experimental evidence of pronounced mutual mate choice in a salticid and also the first experimental evidence of a salticid making size-choice discriminations in the context of mating.


'/>"/>

Contact: Davina Quarterman
davina.quarterman@oxon.blackwellpublishing.com
01-865-476-307
Blackwell Publishing Ltd.
Source:Eurekalert

Related biology news :

1. Nano machine switches between biological and silicon worlds
2. Best of both worlds -- Targeting a single gene could inhibit bone decay and stimulate bone growth
3. Harmful Bacterium Commonly Found in Poultry May Survive Refrigeration and Frozen Storage Combined
4. Scientists reveal how disease bacterium survives inside immune system cell
5. Discoveries by UAB and Florida scientists may help transplanted organs survive longer
6. Bacteria can survive for weeks on hospital surfaces
7. Bacteria that cause tooth decay able to survive without important biochemical pathway
8. Tiny polyps gorge themselves to survive coral bleaching
9. Anthrax spores may survive water treatment
10. Heart has enough oxygen to survive hypothermia, CPR crucial
11. Life and death in the hippocampus: what young neurons need to survive
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2016)... DUBLIN , January 22, 2016 ... has announced the addition of the  ... to their offering. --> ... of the  "Global Behavioral Biometric Market ... --> Research and Markets ( http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ...
(Date:1/20/2016)... Jan. 20, 2016 A market that just ... benefit from the explosion in genomics knowledge. Learn all ... Research. A range of dynamic trends are pushing market ... personalized medicine - pharmacogenomics - pathogen evolution - next ... markets - greater understanding of the role of genetic ...
(Date:1/18/2016)... , Jan. 18, 2016  Extenua Inc., ... that simplifies the use and access of ubiquitous ... go-to-market partnership with American Cyber.  ... extensive experience leading transformational C4ISR and Cyber initiatives ... integrating the latest proven technology solutions," said ...
Breaking Biology News(10 mins):
(Date:2/12/2016)... ... February 12, 2016 , ... The Pittcon 2016 Exposition, which ... will include 848 exhibitors (count as of February 9) of which 119 are ... used by the scientific community in industrial, academic, and government labs. The Exposition ...
(Date:2/12/2016)... FRANCISCO , February 12, 2016 ... Medicine Efforts by Enabling Scientific Understanding of Complex ... and Rare Diseases --> ... genomic diagnostics in South Asia and a leading provider ... would contribute $10 million to the GenomeAsia 100K ...
(Date:2/11/2016)... 2016  Vermillion, Inc. (NASDAQ: VRML ), a ... the formation of the Steering Committee for its Pelvic ... --> Pelvic masses can present physicians and healthcare ... pregnancy is ruled out, pelvic masses may include cancers ... benign ovarian tumors and gastrointestinal and urinary tract masses. ...
(Date:2/11/2016)... Feb. 11, 2016  Spectra BioPharma Selling Solutions (Spectra) ... provides biopharma companies the experience, expertise, operational delivery ... outsourced sales teams. Created in concert with industry ... the strategic and tactical needs of its clients ... through both personal and non-personal promotion. ...
Breaking Biology Technology: