For evolution, migratory processes are events that collaborate with genetic variability, since the entry of a individual in a population group enables the introduction of new genes and, consequently, different characteristics of the existing.
Prior to the dissemination of such genes, carrier individuals are already undergoing the process of adaptation and selection, justified by the following basic principles relating to migration:
- Translocation to similar or different ecotopes, demonstrating their survival skills (defence and nutrition, for example);
- Insertion and adaptation, respectively, to a different habitat and ecological niche;
- And manifestation of behaviors similar and supplementary to those in force (among already adapted individuals).
By passing these criteria, the genes of immigrant individuals (living beings in general), if they are able to reproduce, compatible as to the morphology and physiology of the ruling species, may be transmitted to the descendants and thus successively.
Therefore, migratory events, both through immigration (entry) and emigration (exit), can gradually favor, through the gene flow, a genotypic stability, increasingly refining similarities and reducing differences between organisms of the same species in populations different.
By Krukemberghe Fonseca
Graduated in Biology
Source: Brazil School - https://brasilescola.uol.com.br/biologia/migracao-fluxo-genico.htm