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 h
'/>"/>

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

Page: 1 2

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:4/17/2014)... One day about eight years ago, Katia Silvera , ... her father were on a field trip in a mountainous ... they had never seen before. , Unable to identify it, ... The orchid turned out to be an unnamed species. So ... . , "Lophiaris" is the genus name, comprising about 40 ...
(Date:4/17/2014)... If a restaurant ... he can expect his premises to be trashed. Warnings like ... is enough to make restaurant owners pay up. Similarly, mafia-like ... in other birds, nests. If the host birds throw the ... destroying the entire nest. Consequently, it is beneficial for hosts ...
(Date:4/17/2014)... fragmentation of forests in the Amazon help create ... to rapid and widespread forest loss during drought ... findings show that forests in the Amazon could ... with forest fires lead to large-scale loss of ... assistant professor of geography, Penn State. , "We ...
Breaking Biology News(10 mins):Orchid named after UC Riverside researcher 2Orchid named after UC Riverside researcher 3Fear of the cuckoo mafia 2Fear of the cuckoo mafia 3Drought and fire in the Amazon lead to sharp increases in forest tree mortality 2Drought and fire in the Amazon lead to sharp increases in forest tree mortality 3
... An international team of investigators at Sanford-Burnham Medical Research ... Centre for Molecular Life Sciences and other organizations have ... also plays a significant role in Frank-Ter Haar syndrome ... on February 12 in the American Journal of ...
... CINCINNATI -- Scientists have discovered a molecular pathway that works ... may lead to new therapies for repairing injury in a ... week,s Proceedings of the National Academy of Sciences ... Children,s Hospital Medical Center and the Brigham & Women,s Hospital ...
... reveals that a common underlying mechanism is shared by ... complex defects in brain development and function. Rett syndrome ... Retardation, X-linked syndrome (ATR-X) have each been linked with ... DNA that make up chromosomes and control how genetic ...
Cached Biology News:Researchers identify mechanism for Frank-Ter Haar syndrome 2Scientists discover molecular pathway for organ tissue regeneration and repair 2A common thread links multiple human cognitive disorders 2
(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)... (PRWEB) January 15, 2014 2013 was ... Scottsdale’s Brain State Technologies®. They saw continued independent research ... Center who were awarded a $1 million grant from ... in “Brain and Behavior” a peer reviewed journal, Amy ...
(Date:1/15/2014)... AudioNotch is the internet's leading provider ... treatment of tinnitus. Patients listen to sound therapy that ... period of weeks to months, their tinnitus volume decreases. , ... Notched Music and Notched White Noise. Now, AudioNotch is pleased ...
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: ... 1360 Almshouse Road, Warrington, Pa. , Details: The ... to finding a cure for hepatitis B and improving the ... annual Crystal Ball on Friday, April 11 at Warrington Country ...
Breaking Biology Technology:Study: 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 3Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 2Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2
... the Risks of DVT to Mark U.S. House of ... Coalition to Prevent DVT today announced the launch of ... deep-vein thrombosis (DVT) and to encourage dialogue between healthcare ... A customized recreational vehicle will visit hospitals and ...
... Christine Lawless, MD, has accepted the position as Medical ... medical education (CME), beginning March 2, 2009. Recognized as ... cardiology, Dr. Lawless recently completed her clinical tenure at ... she was Associate Professor of Internal Medicine and Co-Director ...
... March 10 WaferGen Biosystems, Inc. (OTC Bulletin ... analysis systems, today announced that Kumar Kastury, Ph.D., ... will present data on the company,s SmartChip(TM) Real-Time ... Anniversary Quantitative PCR Conference. The conference will ...
Cached Biology Technology:The Coalition to Prevent Deep-Vein Thrombosis (DVT) RV Tour Takes to the Road to Educate the Nation About the Importance of DVT Risk Assessment 2The Coalition to Prevent Deep-Vein Thrombosis (DVT) RV Tour Takes to the Road to Educate the Nation About the Importance of DVT Risk Assessment 3The Coalition to Prevent Deep-Vein Thrombosis (DVT) RV Tour Takes to the Road to Educate the Nation About the Importance of DVT Risk Assessment 4The Coalition to Prevent Deep-Vein Thrombosis (DVT) RV Tour Takes to the Road to Educate the Nation About the Importance of DVT Risk Assessment 5Former President of Sports Cardiology Consultants, LLC Christine Lawless, MD, MBA, ABCL, FACC, FACSM, Named Medical Director of CME Enterprise 2WaferGen to Present Data on SmartChip(TM) Real-Time PCR System at Cambridge Healthtech Institute's Quantitative PCR Conference 2WaferGen to Present Data on SmartChip(TM) Real-Time PCR System at Cambridge Healthtech Institute's Quantitative PCR Conference 3WaferGen to Present Data on SmartChip(TM) Real-Time PCR System at Cambridge Healthtech Institute's Quantitative PCR Conference 4
iNOS/NOS Type II Purified Anti-Mouse, Anti-Rat, Anti-Human clone Polyclonal, Isotype Rabbit Ig, 150 µg Consult technical datasheet for details....
...
... gradient system uses two Adept CE 4100 ... CE 4200 dual wavelength detector for added flexibility. ... by PowerStream data processing software and interface unit, ... The supplied analytical pumps may be substituted ...
... Highly nutritious peptone, used ... production of bacterial toxins, ... of bacteria with high ... Haemophilus, Neisseria, Pasteurella, Salmonella ...
Biology Products: