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Workshop 3DIVERSITY OF ECOSYSTEMS WITHIN THE CENTRES OF BIG INDUSTRIAL TOWNS
Workshop leader: dr Beata Węgrzynek On 27 September 2007 we took part in a workshop for teachers of polish schools participating In The BSP. The outdoor workshop took place in the park „Dolina Trzech Stawów”, “Ochojec” and „Las Murckowski” reserves (the remaining of Puszcza ¦l±ska). The objectives of our observations were species of rare and protected plants typical for the highland regions as well as invasive and expansive species or plants introduced by man.The park „Dolina Trzech Stawów” is a very interesting observation site for a biologist. We could see there mountain spesies like: Alnus incana, Sambucus racemosa, Polygonatum verticillatum, among the rare and protected plants there are: Frangula alnus, Hetera helix, Nuphar luteum, Nymphea alba.
 We also learned about invasive species like Reynoutria japonica, R. sachalinense, R. bohemica, numerous representatives of Impatiens parviflora. We also saw many expansive species like: Carex bryzoides, Pteridium aquilinum. Among many interesting species introduced by man are Platanus xacerifolia or Aesculus hippocastanum. One of the proofs for changes of the air quality is lichens we noticed on the trees in the park „Dolina Trzech Stawów” as well as many species of animals rare within the town area.  Ochojec reserve was another location of our workshop where we observed a representation of very rare species of a mountain shrub Streptopus amplexifolius seldom observed in lower regions. We also noticed that Quercus rubra appears commonly in „Dolina Trzech Stawów”, „Ochojec” and “Las Murckowski’ reserves. Invasive species and the ones introduced by man can be easily distinguished. Having no natural enemies, they are not attacked by parasites and usually win the competition with the native plants therefore fighting them remains an unsolved problem.
Authors: Marzena Jerczyńska, Małgorzata KuĽma, Ludmiła Smęt-Dudziak
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