Scientists have found new evidence to explain how female insects can influence the father of their offspring, even after mating with up to ten males. A team from the University of Exeter has found that female crickets are able to control the amount of sperm that they store from each mate to select the best father for their young.
The research team believes the females may be using their abdominal muscles to control the amount of sperm stored from each mate. Their findings are now published in the journal Molecular Ecology.
Female crickets mate with several different males, including their closest relatives. In general, offspring produced with close relatives are more likely to have genetic disorders. Different animals employ a range of behaviours to avoid this, such as not mating other animals from the group they grow up in. Crickets do not avoid mating with relatives, but this research shows that they produce more offspring fathered by males that are unrelated to them.
To conduct their study, the researchers bred field crickets in the laboratory. They used new DNA-based techniques to determine the quantity stored by each the female. They found that the females stored a higher content of sperm from unrelated males. They then tested young crickets to determine their paternity. The results showed that, regardless of the order in which they had mated, an unrelated mate was more likely to become a father. This must have been under female control, because the methods the team used meant that males could not influence the amount of sperm they passed to the female.
Though the study focused on field crickets, the findings are likely to be relevant in other insect species and possibly other sections of the animal kingdom. For example, chickens are known to store more sperm from dominant males.
Lead author Dr Amanda Bretman of the University of Exeter said: "Our study shows that even after mating, female insects control who fathers their offspring. We're only really just beginning to understand the reasons for the different mating strategies in the insect world and that is thanks to new techniques."
Sarah Hoyle | EurekAlert!
Value from wastewater
16.08.2017 | Hochschule Landshut
Species Richness – a false friend? Scientists want to improve biodiversity assessments
01.08.2017 | Carl von Ossietzky-Universität Oldenburg
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,...
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...
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...
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...
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...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
17.08.2017 | Physics and Astronomy
17.08.2017 | Earth Sciences
17.08.2017 | Physics and Astronomy