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Media type:
E-Article
Title:
The founder principle, genetic drift and selection in isolated populations of Philaenus spumarius (L.) (Homoptera)
Contributor:
Halkka, O.;
Raatikainen, M.;
Halkka, Liisa;
Lallukka, Riitta
Published:
SOCIETAS BIOLOGICA FENNICA VANAMO, 1970
Published in:
Annales Zoologici Fennici, 7 (1970) 2, Seite 221-238
Language:
English
ISSN:
0003-455X;
1797-2450
Origination:
Footnote:
Description:
The relative significance of the founder principle, genetic drift and selection was estimated in 31 populations of Philaenus spumarius living on small islands in the Gulf of Finland, and experiencing great yearly fluctuations in numbers. Philaenus is polymorphic with regard to colour, and this polymorphism is known to be of the balanced type. Each of the main colour forms is determined by a specific chromosomal gene. The frequencies of the colour forms were determined in each of the 31 populations. In populations living on large islands or on small islands close to the mainland, the frequencies approximate to those typical of the mainland populations of southwestern Finland. In such islands, the frequencies were found to be governed mainly by selection. However, the founder principle also appears to be significant. With decreasing size or increasing isolation of the islands, the founder principle, intermittent drift and permanent drift gain in importance. In the outermost zone of the archipelago, the frequencies of the colour genes are determined primarily by the founder principle and genetic drift. The effects exerted by selection under such conditions are discussed.