Navigation Links
Paying for sex and 'playing dead' - the deceitful gift-giving spider
Date:11/13/2011

Male nursery web spiders (Pisaura mirabilis) prepare silk-wrapped gifts to give to potential mates. Most gifts contain insects, but some gifts are inedible plant seeds or empty exoskeletons left after the prey has already been eaten (presumably by the male himself!). Males will also 'play dead' if a female moves away and then attempt to re-establish mating. New research published in BioMed Central's open access journal BMC Evolutionary Biology examines the reproductive success of deceitful males and shows that females are not impressed by worthless gifts.

Male spiders were provided with either a potential gift of a fly, or a worthless item, such as a cotton wool ball, a dry flower head, a prey leftover (previously eaten housefly), or no gift at all. All the gifts were approximately the same size, so the females would not be able to tell what the gift was without unwrapping it. Males that offered any gift were more likely to successfully mate than males without. However the length of time the females allowed males with worthless gifts to spend transferring sperm was shorter than those with edible gifts (and even shorter for those with no gift at all!).

It appears that both male and female spiders are apparently able to assess the value of the gift and modify their behavior accordingly. Not only did the female spiders end mating sooner with an inedible gift, but male death feigning (thanatosis), which is triggered by the female attempting to end mating and run away with the gift, occurred in half of the matings involving an edible gift, but only once with a worthless gift. Similarly males and females were sometimes seen fighting over edible gifts, but never for a worthless gift.

Maria Albo who led the research explained, "The evolution of male deceit involves a complex equation of costs and benefits. It costs the males to find and wrap a gift, but these costs can be reduced if the male does not have to first catch his gift, or gives one that has already been eaten. The benefit of the gift is longer mating, which leads to more sperm being transferred, and potentially a higher number of offspring. However, the females are wise to deception and terminate mating early for worthless gifts."

She continued, "The final results show that the number of eggs hatching was lower if the female had not received a gift, but there was little difference between females who had received an edible or inedible gift. The success of cheating probably explains why both strategies have co-evolved and are maintained in the population."


'/>"/>
Contact: Dr Hilary Glover
hilary.glover@biomedcentral.com
44-020-319-22370
BioMed Central
Source:Eurekalert  

Related biology news :

1. Is governmental investment in industrial R&D paying off?
2. Golf course: Playing fields, wildlife sanctuaries or both
3. Playing it safe
4. Playing sport up to the end of pregnancy is healthy for the baby and the mother
5. Playing Pong with the blink of an eye
6. Rigorous study confirms video game playing increases food intake in teens
7. Deadly rugby virus spreads in sumo wrestlers
8. Brown scientist finds coastal dead zones may benefit some species
9. 15-state Southern obesity summit to focus on deadly epidemic
10. Battling bacteria in the blood: Researchers tackle deadly infections
11. Study: Excessive use of antiviral drugs could aid deadly flu
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Paying for sex and 'playing dead' - the deceitful gift-giving spider
(Date:6/2/2016)... , June 2, 2016 The Department ... has awarded the 44 million US Dollar project, for the ... Vehicle Plates including Personalization, Enrolment, and IT Infrastructure , ... in the production and implementation of Identity Management Solutions. Numerous ... however Decatur was selected for the ...
(Date:6/1/2016)... -- Favorable Government Initiatives Coupled With Implementation ... to Boost Global Biometrics System Market Through 2021  ... " Global Biometrics Market By Type, By End ... - 2021", the global biometrics market is projected to ... growing security concerns across various end use sectors such ...
(Date:5/16/2016)... --  EyeLock LLC , a market leader of iris-based ... IoT Center of Excellence in Austin, Texas ... embedded iris biometric applications. EyeLock,s iris authentication ... with unmatched biometric accuracy, making it the most proven ... platform uses video technology to deliver a fast and ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... ... June 24, 2016 , ... While the majority of commercial spectrophotometers ... 5000 and the 6000i models are higher end machines that use the more unconventional ... spectrophotometer’s light beam from the bottom of the cuvette holder. , FireflySci has ...
(Date:6/23/2016)... , June 23, 2016 /PRNewswire/ - FACIT has ... Ontario biotechnology company, Propellon Therapeutics Inc. ... and commercialization of a portfolio of first-in-class WDR5 ... targets such as WDR5 represent an exciting class ... in precision medicine for cancer patients. Substantial advances ...
(Date:6/23/2016)...  The Biodesign Challenge (BDC), a university competition that ... living systems and biotechnology, announced its winning teams at ... New York City . The teams, ... at MoMA,s Celeste Bartos Theater during the daylong summit. ... curator of architecture and design, and Suzanne Lee ...
(Date:6/23/2016)... 2016 Apellis Pharmaceuticals, Inc. today announced ... of its complement C3 inhibitor, APL-2. The trials ... dose studies designed to assess the safety, tolerability, ... in healthy adult volunteers. Forty subjects ... single dose (ranging from 45 to 1,440mg) or ...
Breaking Biology Technology: