by Marina KHOLODOVA, Cand. Sc. (Biol.), leading research associate, A.N. Severtsev Institute for Problems of Ecology and Evolution, Russian Academy of Sciences (RAS) Now why waste time and effort in studying the genetic diversity of wild animals? Is this relevant for their present and future? Such questions have been asked time and again. Why not just protect populations of rare species even if their initial progenitors were few in number-just several individuals? European bisons (aurochs) are an excellent example illustrating what might seem to be at first sight the small significance of genetic diversity in the animal kingdom. By the onset of the 20th century there were only a few individuals of them, while their present population of three thousand comes from only twelve ancestors. That is why the genetic diversity of the newly reproduced population of aurochs is but very small. Our optimism in the initial period of the struggle for their numbers is giving way to concern about the future welfare of this species. Such signs as the diminishing survival value of youngsters as well the incidence of diseases detected by Russian and Polish zoologists (caused by microorganisms, these diseases were considered not pathogenic before) go to show that the viability of aurochs whose gene pool is much depleted is declining. Today many facts point to this interdependence. It is particularly evident in rare species and small populations (cheetah, isolated groups of wolves, etc.). The matter involves not only the above negative aftereffects for the newly born younglings (lower weight, resistance to infections). The depleted gene pool also tells on different aspects of the reproduction process-from faulty spermatogeny in males to deviations in the normal sexual behavior and mating. Small isolated populations become prone to inbreeding and incest, something that worsens the animals' morphophysiological characteristics. In some species males come to be superior in numbers amongst ... Read more

Эта публикация была размещена на Либмонстре в другой стране и показалась интересной редакторам.

Полная версия:
Қазақстан Желіде · 2124 days ago 0 1821
Professional Authors' Comments:
Order by: 
Per page: 
  • There are no comments yet
Library guests comments

0 votes
Қазақстан Желіде
Астана, Kazakhstan
02.10.2018 (2124 days ago)
Permanent link to this publication:

Library Partners

BIBLIO.KZ - Digital Library of Kazakhstan

Create your author's collection of articles, books, author's works, biographies, photographic documents, files. Save forever your author's legacy in digital form. Click here to register as an author.

Editorial Contacts
Chat for Authors: KZ LIVE: We are in social networks:

About · News · For Advertisers

Digital Library of Kazakhstan ® All rights reserved.
2017-2024, BIBLIO.KZ is a part of Libmonster, international library network (open map)
Keeping the heritage of Kazakhstan


US-Great Britain Sweden Serbia
Russia Belarus Ukraine Kazakhstan Moldova Tajikistan Estonia Russia-2 Belarus-2

Create and store your author's collection at Libmonster: articles, books, studies. Libmonster will spread your heritage all over the world (through a network of affiliates, partner libraries, search engines, social networks). You will be able to share a link to your profile with colleagues, students, readers and other interested parties, in order to acquaint them with your copyright heritage. Once you register, you have more than 100 tools at your disposal to build your own author collection. It's free: it was, it is, and it always will be.

Download app for Android