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1

Doubly uniparental inheritance of mitochondrial DNA in the freshwater bivalve Anodonta woodiana (Bivalvia: Unionidae)

100%
Soroka M.
Folia Biologica
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2008
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vol. 56
|
issue 1-2
91-95
EN
Unlike the vast majority of organisms in which mitochondrial DNA is transmitted maternally (standard mitochondrial inheritance, SMI), some marine or freshwater bivalves exhibit a different pattern of mtDNA transmission, named doubly uniparental inheritance (DUI). In this case there are two types of mtDNA, i.e. the female-transmitted (F-type) and the male-transmitted (M-type), the latter being present only in the male gonads of Unionidae bivalves. Current knowledge on DUI does not cover any freshwater mussels that are found in Poland. This study confirms DUI of mtDNA in A. woodiana, a Chinese mussel discovered in Poland in 1993. The sequence divergence in the COI gene region for the F-type ranged between 0% (separately for Polish and Japanese mussels) and 8.1% (between Polish and Japanese specimens). On the other hand, this parameter was higher for the M-type, reaching 9.7% between Polish and Japanese specimens. Sequence divergence between the F- and M-types reached 34-35% and, although very high, was still characteristic for the bivalves in which DUI had been found.
2

Complete sequences of maternally inherited mitochondrial genomes in mussels Unio pictorum (Bivalvia, Unionidae)

63%
Soroka M., Burzynski A.
|
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vol. 51
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issue 4
469-476
EN
Mitochondrial genomes are frequently used to infer phylogenetic relationships. Some taxa are, however, poorly represented. To facilitate better understanding of the potential of mitochondrial genome data in freshwater mussels, we present here, for the first time, the mitochondrial sequences of 4 complete F-type mitochondrial genomes from the European freshwater bivalve Unio pictorum (Unionidae). These genomes are very compact (15 761 bp) but have a typical gene complement for bilaterian mitochondrial genomes and a very similar organization to other unionid genomes available in databases. Very low nucleotide diversity within the species suggests a small effective population size of Polish U. pictorum, a phenomenon of potential importance for environmental management policies.
3

Genetic variability in selected Polish population of Dreissena polymorpha (Pallas) (Bivalvia: Dreissenidae)

51%
Zielinski R., Soroka M., Wachowiak-Zielinska M.
Journal of Applied Genetics
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1996
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vol. 37
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issue 1
105-120
EN
Genetic variability of a selected population of Dreissena polymorpha an invasive species playing a significant role in aquatic ecosystems was studied.Starch gel electrophoresis was used to analyse 8 enzymatic loci in 200 individuals collected from 20 sites in a lake.The population was found to have 75% of polymorphic loci, 2.8 alleles per locus, 3.5 alleles per polymorphic locus, 0.393 coefficient of expected heterozygosity, and 149 genotypes.Zebra mussel clumps were strongly polymorphic; almost every individual had a different genotype.The hihg polymorphism observed in the Dreissena polymorpha clumps had mostly likely resulted from external cross-fertilization and the presence of free-swiming veliger larvae as well as from a considerable heterozygosity of individual bivalves.Genetic variability of the population studied was found to be similar to that of populations inhabiting other Western Pomeranian lakes, including both highly polluted ones and those formed as recently as about 40 years ago.This provides evidence for a mass colonisation of freshwater reservoires effected by very polymorphic parent populations of Dreissena polymorpha.The literature data on North American zebra mussel populations which invaded that continent about 10 years ago show them to be polymorphic, too, but not as much as European ones.
4

Distribution and genetic diversity of the terrestrial slugs Arion lusitanicus Mabille, 1868 and Arion rufus (Linnaeus, 1758) in Poland based on mitochondrial DNA

51%
Soroka M., Kozlowski J., Wiktor A., Kaluski T.
Folia Biologica
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2009
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vol. 57
|
issue 1-2
71-81
EN
The slugs Arion lusitanicus and Arion rufus inhabit ecologically degraded areas and are serious vegetation pests. In recent years, new localities of these species have been found in various parts of Poland. Here we study themorphology of 90 specimens from9 populations of slugs. The morphology of the genital system allowed for the identification of 60 A. lusitanicus specimens from 6 populations and 30 A. rufus individuals from another 3 localities. In order to describe their genetic diversity at the level of the individual, population, and species, we compared sequences of the mitochondrial cytochrome oxidase subunit I (cox1) gene. The morphological analysis revealed that each of the studied populations comprised a single species, which was also confirmed by the molecular assay.We obtained 674-bp sequences of the cox1 gene for each species that showed a total of eight haplotypes. The genetic diversity of A. lusitanicus individuals ranged from 0.5% to 2.1%, whereas that of A. rufus was twice as low: 0.4-1.0%. The difference between the two species within the cox1 gene was at the level of 12%. Three A. lusitanicus and two A. rufus populations were found to be monomorphic. Large inter-population variability was found within each of the studied species, which suggests that the Polish populations of A. lusitanicus may have originated from repeated, separate introductions arriving from various parts of Europe.
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