Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ritualized submission and pseudo-copulation reduce aggression among male crayfish

21.11.2006
Pseudo-copulation--an interaction that mimics sexual copulation--is a behavior known in mammalian communities that reduces aggression and signifies social dominance, particularly among males.

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!
Further information:
http://www.current-biology.com

Further reports about: Aggression crayfish pseudo-copulation reduce

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: In best circles: First integrated circuit from self-assembled polymer

For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.

In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Researchers invent tiny, light-powered wires to modulate brain's electrical signals

21.02.2018 | Life Sciences

The “Holy Grail” of peptide chemistry: Making peptide active agents available orally

21.02.2018 | Life Sciences

Atomic structure of ultrasound material not what anyone expected

21.02.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>