Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Why Beavers Survived In The 19th Century

15.10.2004


Russian scientists give an explanation for the wonder of beaver survival throughout the 19th century, when these animals were badly endangered and lived in conditions that would be fatal for another mammalian species.



A population of beavers can survive, if it includes only three animals living together. Such a small size of viable population is explained by the genetic adaptation of beavers to inbreeding. Beaver genome and behaviour account for an outstanding viability of this species, as is established by A.N. Milishnikov and his colleagues from the Severtsov Institute of Ecology and Evolution in Moscow.

Beavers have a rather puritan character: as distinct from other mammalian species, they don’t give way to promiscuity, but live as couples and even families. Several families make up a settlement (colony) that is a larger society of beavers. However, families maintain their genetic isolation and do not interbreed. Each family resides within a certain area of a river and bank, where the others cannot enter (trespassers are severely punished).


In every family, only one couple breeds, and their offspring stay with them for a long while and don’t breed. Young beavers can make up a couple once they find a suitable place on the river for their own family lodge. Obviously, beavers possess a huge reserve of genetic diversity in order to avoid the negative consequences of inbreeding.

Russian scientists have revealed that genetic differences between beavers within the same colony are stronger than those between representatives of different colonies. A beaver chooses a mate not haphazardly. This was for the first time discovered in the course of captive breeding, which was rather unsuccessful: most animals refused to mate and behaved aggressively to each other.

Only very few couples were happy and lived together for many years. The scientists do not yet know how beavers choose their mates. Apparently, it is somehow connected with the need to avoid genetic similarity.

Sergey Komarov | alfa
Further information:
http://www.informnauka.ru

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling of PET Bottles: New Ideas for Resource Cycles in Germany
25.06.2018 | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

nachricht Dry landscapes can increase disease transmission
20.06.2018 | Forschungsverbund Berlin e.V.

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

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

Im Focus: Future electronic components to be printed like newspapers

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...

Im Focus: First evidence on the source of extragalactic particles

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...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

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...

Im Focus: Breaking the bond: To take part or not?

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...

Im Focus: New 2D Spectroscopy Methods

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....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>