However, this complex, so-called ritualized behavior is not widely known to occur among invertebrate species. Researchers have now reported that male crayfish--invertebrates--also use pseudo-copulation to signify formation of a dominance hierarchy and reduce aggression and lethal battles between male rivals.
The findings, reported by Fadi Issa and Donald Edwards of Georgia State University, appear in the November 21st issue of the journal Current Biology, published by Cell Press.
The researchers found that pseudo-copulation among male crayfish was nearly identical to normal sexual copulation, in that the eventual dominant male displays male copulatory behavior and the subordinate male displays female copulatory behavior. Bouts of pseudo-copulation were intermingled with aggressive interactions as the eventual dominant male attempts to mount the eventual subordinate male, who either accepts or refuses. In pairs that pseudo-copulated, initial aggressive interactions became less intense and less frequent over the first hour of interaction, and all the animals survived over the first 24 hours.
However, in male pairs that did not pseudo-copulate, similar initial levels of aggression were maintained over the first hour, and half of the subordinate males were killed during the first 24 hours. Therefore, to a large extent, subordinate males depend on pseudo-copulation for survival--an illustration of how this mutual behavior directly affects the fitness of crayfish and how it may have proven beneficial over the course of evolution.
Heidi Hardman | EurekAlert!
Making fuel out of thick air
08.12.2017 | DOE/Argonne National Laboratory
‘Spying’ on the hidden geometry of complex networks through machine intelligence
08.12.2017 | Technische Universität Dresden
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
An interdisciplinary group of researchers interfaced individual bacteria with a computer to build a hybrid bio-digital circuit - Study published in Nature Communications
Scientists at the Institute of Science and Technology Austria (IST Austria) have managed to control the behavior of individual bacteria by connecting them to a...
Physicists in the Laboratory for Attosecond Physics (run jointly by LMU Munich and the Max Planck Institute for Quantum Optics) have developed an attosecond electron microscope that allows them to visualize the dispersion of light in time and space, and observe the motions of electrons in atoms.
The most basic of all physical interactions in nature is that between light and matter. This interaction takes place in attosecond times (i.e. billionths of a...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
11.12.2017 | Physics and Astronomy
11.12.2017 | Earth Sciences
11.12.2017 | Information Technology