Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Anemone Armies Battle to a Standoff

23.08.2005


Clashing colonies of sea anemones fight as organized armies with distinct castes of warriors, scouts, reproductives and other types, according to a new study.


Warrior anemones reach over from several rows behind the front to attack animals from a neighboring colony. (Rick Grosberg/UC Davis photo)



The sea anemone Anthopleura elegantissima lives in large colonies of genetically identical clones on boulders around the tide line. Where two colonies meet they form a distinct boundary zone. Anemones that contact an animal from another colony will fight, hitting each other with special tentacles that leave patches of stinging cells stuck to their opponent.

David J. Ayre from the University of Wollongong, Australia, and Rick Grosberg from UC Davis have previously taken individual anemone polyps from separate colonies and studied fighting strategies one-on-one. But that’s like trying to understand two armies by taking a single soldier from each side, Grosberg said.


Now, the researchers have been able to study two entire colonies as they clash.

When the tide is out, the polyps are contracted and quiet. As the tide covers the colonies, "scouts" move out into the border to look for empty space to occupy. Larger, well-armed "warriors" inflate their stinging arms and swing them around. Towards the center of the colony, poorly armed "reproductive" anemones stay out of the fray and conduct the clone’s business of breeding.

When anemones from opposing colonies come in contact, they usually fight. But after about 20 or 30 minutes of battle the clones settle down to a truce until the next high tide.

It’s not just polyps along the border between two clones that clash. Polyps three or four rows away from the front will reach over their comrades to engage in fights, Grosberg said.

Differentiation into warriors seems to depend on a combination of signals from enemy stings and the genetics of the colony. Different colonies react differently to similar signals, explaining why different clones are organized into so many different kinds of armies. But borders between colonies can remain stable for years, even though the two colonies organize their armies in different ways.

The study shows that very complex, sophisticated, and coordinated behaviors can emerge at the level of the group, even when the group members are very simple organisms with nothing resembling a brain, Grosberg said. The research was published in the June issue of the journal Animal Behaviour.

Andy Fell | EurekAlert!
Further information:
http://www.ucdavis.edu

More articles from Life Sciences:

nachricht Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery
20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH

nachricht Seeking structure with metagenome sequences
20.01.2017 | DOE/Joint Genome Institute

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>