A University of Liverpool study of fruit flies has revealed that males forced to compete with other males become less attractive to females and die young.
In the test, male fruit flies of the species Drosophila subobscura were kept either alone or in groups. The females of this species are monandrous – they only mate once in their lives, meaning that males have to get very lucky to mate at all. As a result males compete furiously for access to females.
Evolutionary biologist, Dr Anne Lizé, who led the study said: "When we see stags fighting over mates, it's obvious what the potential costs to the males are, but in this case it's more subtle. The flies aren't using antlers to beat each other into submission, but instead are harassing each other to the point where exhaustion causes them to die young."
Dr Lizé and her colleagues from the University's Institute of Integrative Biology, think that rivals disrupt the flies' sleep patterns, which has already been identified as a cause of early death in many other species, and is potentially harmful to humans.
Males exposed to rivals fare even worse when they finally do meet a virgin female. Females strongly prefer the males that were kept alone, with females refusing to mate with three quarters of the males that previously had to battle with rivals.
Dr Lizé concluded: "The idea that competition has more subtle effects on a male could be extended to other species that humans are trying to breed or keep healthy."
The study was funded by the Natural Environment Research Council (NERC) and published in Proceedings of the Royal Society B.
Jamie Brown | Eurek Alert!
Researchers observe major hand hygiene problems in operating rooms
30.03.2015 | University of Gothenburg
Electric vehicle range in 450,000 kilometer real-world test
30.03.2015 | Technische Universität Chemnitz
In an experiment at the Department of Energy's SLAC National Accelerator Laboratory, scientists precisely measured the temperature and structure of aluminum as...
The IPH presents a solution at HANNOVER MESSE 2015 to make ship traffic more reliable while decreasing the maintenance costs at the same time. In cooperation with project partners, the research institute from Hannover, Germany, has developed a sensor system which continuously monitors the condition of the marine gearbox, thus preventing breakdowns. Special feature: the monitoring system works wirelessly and energy-autonomously. The required electrical power is generated where it is needed – directly at the sensor.
As well as cars need to be certified regularly (in Germany by the TÜV – Technical Inspection Association), ships need to be inspected – if the powertrain stops...
When an earthquake hits, the faster first responders can get to an impacted area, the more likely infrastructure--and lives--can be saved.
The Atlantic overturning is one of Earth’s most important heat transport systems, pumping warm water northwards and cold water southwards. Also known as the Gulf Stream system, it is responsible for the mild climate in northwestern Europe.
Scientists now found evidence for a slowdown of the overturning – multiple lines of observation suggest that in recent decades, the current system has been...
Because they are regularly subjected to heavy vehicle traffic, emissions, moisture and salt, above- and underground parking garages, as well as bridges, frequently experience large areas of corrosion. Most inspection systems to date have only been capable of inspecting smaller surface areas.
From April 13 to April 17 at the Hannover Messe (hall 2, exhibit booth C16), engineers from the Fraunhofer Institute for Nondestructive Testing IZFP will be...
25.03.2015 | Event News
19.03.2015 | Event News
17.03.2015 | Event News
31.03.2015 | Life Sciences
31.03.2015 | Materials Sciences
31.03.2015 | Earth Sciences