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Fern Azolla filiculoides at New Sites in Oder River (Poland) — Invader or Ephemeral?

Myśliwy M., Szlauer-Łukaszewska A.

Polish Journal of Ecology

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2017

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Vol. 65, nr 4

405--414

EN

Azolla filiculoides Lam. is the second most widely distributed alien aquatic plant in Europe. A native of America, it has become — on account of human mediation — a cosmopolitan species. In Poland, it has been known so far from a few stands in ponds and old river beds. In 2016, it was recorded at six new sites in-between the groynes at the main Oder river bed between Maszewko near Krosno Odrzańskie (52°3′10.69″N, 14°57′13.56″E) and Owczary (52°28′53.59″N, 14°37′30.43″E). The assemblages containing the fern were identified as representing the association Ceratophyllo-Azolletum filiculoidis Nedelcu 1967. Azolla has also entered the phytocoenoses of other floating plant communities. Mean values of several chemical parameters of the water like conductivity, salinity, total dissolved solids and nitrate content at the fern stations were significantly higher than the mean values found in the Azolla-devoid sites while the values for hardness (Ca), pH and visibility (Secchi Disc depth) were lower at Azolla sites. In 2017, this alien fern was found to had successfully overwintered in the main bed of Oder river, and its further spread down the river was observed. The appearance of Azolla filiculoides in the Oder may be associated with an exceptionally warm winter; its emergence may also accelerate the species' invasion in Poland.

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Co-occurrence of Sinanodonta woodiana with native Unionidae in the lower Oder

Szlauer-Łukaszewska A., Andrzejewski W., Gierszal H., Urbańska M.

Oceanological and Hydrobiological Studies

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2017

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Vol. 46, No. 2

244--248

EN

The Asiatic bivalve Sinanodonta woodiana (Lea, 1834), which is more and more widespread in all parts of Europe, in Poland has been mostly reported from lentic waters, especially fish ponds. In contrast to some other European countries, no data have been published on its presence in rivers of Poland. In 2015, monitoring was carried out in the lower Oder River and in the mouth of the Warta River, as a result of which S. woodiana was recorded there for the first time. This was possible due to prolonged drought, which led to extremely low water levels in most of the inland water bodies and watercourses, so that other research methods could be used. The presented results confirm that the species spreads easily by colonizing waters of various types, which in the future may lead to the formation of large populations.

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Aulodrilus pigueti Kowalewski, 1914 (Annelida: Clitellata) : a new record for the Polish fauna from the Oder River and remarks on other oligochaetes rarely noticed in Poland

Jabłońska A., Szlauer-Łukaszewska A., Bańkowska A.

Oceanological and Hydrobiological Studies

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2015

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Vol. 44, No. 4

456--465

EN

The cosmopolitan freshwater oligochaete Aulodrilus pigueti Kowalewski, 1914 (Naididae: Tubificinae) was recorded for the first time in Poland. The species was found at a few groyne field sites and in the main flow of the middle and lower course of the Oder River. Forty two other species of oligochaetes were found in the analyzed material, including rarely found in Poland Aulodrilus japonicus and Bothrioneurum vejdovskyanum, as well as alien species: Branchiura sowerbyi and Quistadrilus multisetosus.