Is the Potamogeton polygonifolius really critically endangered in Poland? The case of stable population of the rare species on its geographical range limits (original) (raw)

The present study was focused on Potamogeton polygonifolius -the species considered to be endangered in Germany, the Czech Republic, Poland and Switzerland. Field studies were carried out in the Lower Silesia and Lusatia in southwestern Poland in order to verify the current distribution of the species along the eastern edge of its general range and to assess the threat status of P. polygonifolius in that area and in general at Poland. The historical range of the species in the Lower Silesia was investigated, mainly within the Lower Silesia Forest (Bory Dolnośląskie). In total, 18, currently existing populations of P. polygonifolius were found. The Lower Silesian populations were assessed using the IUCN criteria. The species was assigned to NT category in the Lower Silesia as well as in Poland. Potamogeton polygonifolius as valuable element of Polish flora should be legally protected, monitored, and, if necessary, actively managed.

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