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    Wyświetlanie 1-3 z 3
    Tytuł:
    Genetic variability in selected Polish population of Dreissena polymorpha [Pallas] [Bivalvia; Dreissenidae]
    Autorzy:
    Zielinski, R
    Soroka, M
    Wachowiak-Zielinska, M
    Powiązania:
    https://bibliotekanauki.pl/articles/2047704.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    genetic variability
    Polska
    Bivalvia
    Dreissena polymorpha
    enzyme polymorphism
    population
    Dreissenidae
    Opis:
    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 75.0% 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 high polymorphism observed in the D. polymorpha clumps had most likely resulted from external cross-fertilisation and the presence of free-swimming 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 reservoirs effected by very polymorphic parent populations of D. 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.
    Źródło:
    Journal of Applied Genetics; 1996, 37, 1; 105-120
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution, genetic structure and ecological role of Dreissena polymorpha (Pallas) in Lake Dabie, Western Pomerania, Poland
    Autorzy:
    Piesik, Z.
    Zielinski, R.
    Wachowiak-Zielinska, M.
    Ochman, T.
    Soroka, M.
    Polok, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/85237.pdf
    Data publikacji:
    1998
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    distribution
    genetic structure
    ecological role
    Dreissena polymorpha
    Lake Dabie
    West Pomeranian region
    Polska
    Pomeranian region
    bottom
    lake
    phytoplankton
    biomass
    age composition
    polymorphism
    water body
    zebra mussel
    Odra River
    estuary
    Opis:
    Dreissena polymorpha inhabits about 46.5% of the bottom area in Lake Dabie. It is most abundant in the northern part of the lake and sporadically occurs in its southern part. The average density of the zebra mussel is 891 individuals/m², while its wet weight is 1374 g/ m². In the settled areas the density of the zebra mussel reaches 1734 individuals/ m². There were presently established 7 age-groups from 0 to 6+. The highest number of specimens occurred in the age-groups between 1+ and 3+, while the lowest number - in the groups 0, 5 and 6+. Strong eutrophication and pollution of Lake Dabie on its southern side, combined with sedimentation of the extensive amounts of seston carried in by the Płonia and Regalica rivers, do not create favourable conditions for development of Dreissena. D. polymorpha plays a very positive role in the lake ecosystem through its biofiltrating action, contributing thus to an increase of water clarity and to limitation of phytoplankton development through cumulating nutrients in its biomass. Electrophoretic analysis of 9 enzymatic loci revealed strong polymorphism of the studied population of the zebra mussel: percent of polymorphic loci - 100, mean number of alleles in locus – 3.4, coefficient of expected heterozygosity per locus in the population, HS - 0.335, percentage of separate genotypes - 69%, in this number unique genotypes - 58%. A very strong scattering of the alleles was stated within the entire population. In each aggregation, on average, 90% of the specimens have a separate genotype. Each of the five defined groups of D. polymorpha, representing profiles I-V, respectively, had similar genetic composition. The values of the genetic similarity among the studied groups of the zebra mussel ranged from 0.96 to 0.99.
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1998, 02
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In-channel accretionary macroforms in the modern anastomosing system of the upper Narew River, NE Poland
    Autorzy:
    Gradziński, R.
    Baryła, J.
    Doktor, M.
    Gmur, D.
    Gradziński, M.
    Kędzior, A.
    Paszkowski, M.
    Soja, R.
    Zieliński, T.
    Żurek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/191527.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    anastomosing river
    sand bars
    vegetation
    Polska
    Opis:
    Predomination of sandy bedload is typical of the anastomosing channels of the Narew River. Several types of in-channel accretionary macroforms have been found in these channels: side bars, concave-bank bars, plug bars, point bars, linguoid bars, and mid-channel bars. The first three types are relatively rare, point bars occur only exceptionally, while linguoid bars and mid-channel bars are quite common. The bars usually occur in main channels, which are the master routes of sand transport in the whole anastomosing system of the Narew. The lower parts of the bars are built of coarse- and medium-grained sand, similarly to the sediments in the deeper parts of the channels. Fine-grained sand, locally alternating with organic-rich muddy sand, predominates usually in the upper parts; peat with high content of sand is present in the highest parts of some bars. All bars are rapidly colonised and stabilised by plants. It is for this reason and due to the low energy of the river that the bar sediments have a high preservation potential. The development of bars is usually not accompanied by lateral migration of channels. Consequently, sediment accretion in bars is one of the factors leading to gradual narrowing of channels. Deposits of some sand-bars, when preserved in fossil record, may probably be represented by characteristic "wings" in the outer parts of ribbon-like sand bodies.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2003, 73, No 1; 35-53
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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