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!
Scientists uncover the role of a protein in production & survival of myelin-forming cells
19.07.2018 | Advanced Science Research Center, GC/CUNY
NYSCF researchers develop novel bioengineering technique for personalized bone grafts
18.07.2018 | New York Stem Cell Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences