Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

An invasion of cheats: The evolution of worthless nuptial gifts

11.01.2005


So-called nuptial gifts – often consisting of food or tokens – are typically bestowed by males on females as part of courtship and copulation rituals in many species. By manipulating the nuptial gifts that female insects receive during copulation, researchers have now shown that female preferences can be exploited by males who are "cheating" on their reproductive investment by presenting easily obtainable token gifts.





Gift-giving during courtship and copulation occurs across the animal kingdom, including in humans. Nuptial gifts can range from valuable nutritious food items to inedible tokens such as leaves or silk balloons. Gift-giving is of clear benefit to females when gifts are nutritious and thus valuable, but why females of some species require an inedible and worthless gift remains unexplained. In experiments reported this week, researchers Natasha LeBas and Leon Hockham from the University of St. Andrews removed the valuable (i.e., edible) nuptial gift that male empidid dance flies normally provide their female partner and replaced the gift with either a large edible gift or an inedible cotton ball token that resembles tokens given by other empidid fly species. The researchers found that although pairs copulated longest after presentation of a large edible gift, the females receiving the worthless cotton ball token were sufficiently tricked to allow males to copulate for as long as when the males provided a small nutritious gift. Males who substitute highly visible, but easily obtainable and worthless gifts may thus be able to invade a population of genuine gift-giving males.

The research demonstrates that, at least in some cases, females are susceptible to the invasion of so-called male cheating behaviour, and it suggests that the evolution of worthless gift-giving may arise though males’ sensory exploitation of female preferences for nutritious gifts.


Natasha R. LeBas and Leon R. Hockham: "An Invasion of Cheats: The Evolution of Worthless Nuptial Gifts"

Heidi Hardman | EurekAlert!
Further information:
http://www.cell.com
http://www.current-biology.com

More articles from Life Sciences:

nachricht What the world's tiniest 'monster truck' reveals
23.08.2017 | American Chemical Society

nachricht Treating arthritis with algae
23.08.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>