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1

Intraspecies differentiation of Paramecium triaurelia.I.Strains from Spain

100%
Przybos E.
Folia Biologica
|
1995
|
vol. 43
|
issue 1-2
5-7
EN
The genetic differentiation of strains within Paramecium triaurelia was studied by intra- and inter-strain crosses of the Spanish strains from Castile and Andalusia and the standard one (strain 324 from Florida, USA).The clones of both generations F1 obtained by conjugation and F2 by autogamy, in intra- and inter-strain crosses showed a high survival rate.It was found that strains coming from remote regions were not genetically differentiated within P.triaurelia, which confirms the moderate inbreeding type of the breeding system of the studied species.
2

Mortality of aquatic birds in the Gulf of Gdansk as a result of oil pollution

100%
Meissner W.
Oceanological Studies
|
1996
|
vol. 25
|
issue 1-2
151-157
EN
Poland is one of the few countries around the Baltic Sea where the mortality of aquatic birds due to oil pollution has been monitored since the 1960s.The most comprehensive data has been gathered in the Gulf of Gdansk region.During the sixties and seventies Polish coastal waters were permanently comtaminated by numerous though relatively small leaks from port installations, ships and fishing cutters.The density of dead, oiled birds was then high and ranged from 3-5 individuals per km.The 1980s witnessed a rapid decline in the number of oiled birds, owing probably to the tightening of puntative measures against the perpetrators of marine pollution, and to the recession, which also affected the maritime economy.Furthermore, the source of contamination had moved, a fact endorsed by the species composition of the dead birds recovered.At present, far fewer patroleum-based contaminants enter to open sea; the major sources of such pollution are now to be found on the coast.
3

New habitats of species of the Paramecium aureliacomplex in Russia and Vietnam

100%
Przybos E., Fokin S.
|
|
vol. 44
105-106
EN
Two strains from Russia, one collected in Stary Peterhof, St. Petersburg and the second one in Irkutsk near Lake Baikal, both bearing two types of endosymbiont - Caedibacter sp. in the cytoplasm and Holospora caryophila in the macronucleus, were identified as Paramecium biaurelia. The strain originating from Hanoi, Vietnam was determined as Paramecium primaurelia, this strain has no endosymbionts.
4

Intraspecies differentiation of Paramecium triaurelia (Ciliophora, Protista). IV. Strains from Ukraine

100%
Przybos E.
Folia Biologica
|
1998
|
vol. 46
105-108
EN
The results of intra- and inter-strain crosses carried out between the Ukrainian strains and the standard one are presented. Also inter-strain cross was made between strains from distant regions of Europe, i.e. from Spain and Ukraine. The results showed that strains coming from different localities in Ukraine as well as from the distant regions of Europe, i.e. Spain and Ukraine, or even originating from Europe and the USA, were not genetically differentiated within P. triaurelia. The studied strains can interbreed in spite of their geographical isolation. The results indicate that in the studied species of the P. aurelia complex there exists a type of breeding system which can be called moderate inbreeding.
5

Phylogenetic relationships of Paramecium jenningsi strains (classical analysis and RAPD studies)

100%
Przybos E., Skotarczak B., Wodecka B.
Folia Biologica
|
2003
|
vol. 51
|
issue 1-2
85-95
EN
The present studies with application of classical strain crosses and RAPD-PCR analyses showed the existence of different genetic species (syngens) within Paramecium jenningsi. So far the existence of only one syngen has been accepted. It was found that strains from Saudi Arabia, India, and China compose one genetic species (syngen 1) and six strains from Japan compose second genetic species (syngen 2).
6

Intraspecies differentiation of Paramecium triaurelia. II. Strains from Romania

100%
Przybos E.
|
|
vol. 44
27-29
EN
A high percentage of surviving clones of F1 and F2 generations was observed in intra- and inter-strain crosses of the studied Romanian strains. A similar survival was also found in the inter-strain crosses of the Romanian strains with the standard (324) strain of the species, and in the crosses of both Romanian strains with the strains from Spain. Hybrids of the inter-strain crosses did not show any cytological disorders in the nuclear apparatus. The results prove the absence of genetic barriers between the studied strains, coming from Romania and Spain, and the American one.
7

Intraspecies structure of Paramecium pentaurelia

88%
Przybos E.
Folia Biologica
|
1999
|
vol. 47
|
issue 1-2
25-27
EN
The results of crosses carried out between the strains originating from regions of Europe distant from each other, i.e. from Spain and Hungary as well as between them and the standard strain of P. pentaurelia from Pennsylvania, USA are presented. It seems that the studied strains are not genetically differentiated within P. pentaurelia and that the species is characterized by moderate inbreeding.
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