Does polyploidy occur in central European species of the family Sphaeriidae (Mollusca: Bivalvia)?

Abstract: Some representatives of the bivalve family Sphaeriidae are assumed to be polyploid. In this study, 11 sphaeriid species (nine of the genus Pisidium, one of Musculium, and one of Sphaerium) inhabiting central Europe were studied karyologically, 10 of them for the first time. Analysis revealed high chromosome numbers (from 140 to 240). To elucidate the origin of high chromosome numbers, DNA contents were measured by flow cytometry in 5 of the studied species and, for comparison, in S. corneum and S. nucleus, which are known to be diploid (2n=30). Species with high chromosome counts yielded very similar DNA contents that are not higher than in the related species with low diploid numbers. This finding contradicts a possible origin of these species by recent polyploidization or hybridization of related species. Chromosome complements of the investigated species with high chromosome numbers differ from those with low 2n in their small chromosome size and the high proportion of subtelo- or acrocentric chromosomes. This indicates their possible origin either by an ancient polyplodization event followed by chromosomal rearrangements or by multiple chromosome fissions.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Does polyploidy occur in central European species of the family Sphaeriidae (Mollusca: Bivalvia)? ; volume:5 ; number:6 ; year:2010 ; pages:777-784 ; extent:8 ; Open life sciences ; 5, Heft 6 (2010), 777-784 (gesamt 8)

Contributors, Places and Time

• Creator: Kořínková, Tereza ; Morávková, Alena

Further information

• DOI: 10.2478/s11535-010-0066-5
• URN: urn:nbn:de:101:1-2409201858595.070249117654
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:37 AM CEST