Roczniki Akademii Rolniczej w Poznaniu CCCXCII
Botanika – Steciana , , - www.up.poznan.pl/steciana ISSN -
NEW STATION OF POTAMOGETON ×SALICIFOLIUS WOLFG. IN NORTH EASTERN POLAND
A P
A. Pliszko, Department of Plant Taxonomy, Phytogeography and Herbarium, Jagiellonian University, Kopernika , - Kraków, Poland, e-mail: [email protected]
(Received: April , . Accepted: June , )
ABSTRACT. Potamogeton ×salicifolius Wolfg., the hybrid between P. lucens L. and P. perfoliatus L., is re- corded from north-eastern Poland for the fi rst time. The new station is located in the Wigry Lake (the Wigry National Park), within FB square unit of the ATPOL cartogram grid. The distribution is updated with one new population of vegetative ramets.
KEY WORDS: Potamogeton, hybrid, distribution, Wigry National Park, Poland
INTRODUCTION TAXONOMICAL REMARKS
Potamogeton ×salicifolius Wolfg. (Potamogetonace- Potamogeton ×salicifolius was originally described ae), willow-leaved pondweed is an established hybrid from Lithuania by J.F. Wolfgang in his unpublished between P. lucens L. and P. perfoliatus L., which oc- monograph in the beginning of the th century (K - curs mainly in the northern part of Europe (Ireland, and Z -G ). It is sterile hybrid the United Kingdom, Denmark, Sweden, France, the between two submerged broad-leaved homophyllous Netherlands, Switzerland, Germany, Poland, Lithuania, species of Potamogeton, which reproduces vegetatively Estonia and Russia). The distribution of the hybrid co- by rhizomes and stem fragmentation. Potamogeton ×sa- incides with the areas aff ected by the Late Pleistocene licifolius is generally intermediate, but may be confused glaciation, where the postglacial lakes occur (K with its parental species and P. ×nitens Weber. Pota- ). In the southern part of the European continent, mogeton ×salicifolius diff ers from P. lucens by having the hybrid is extremely rare, and has been recorded the leaves sessile and semi-amplexicaul, and with more only from Italy (K ). Both parental species longitudinal veins, and from P. perfoliatus by the leaves have wide ranges: P. lucens is confi ned to Europe, west- apiculate and slightly mucronate, with fewer veins, and ern and central Asia, northern and eastern Africa, and by delicate, but persistent stipules (Z -G P. perfoliatus is native to Europe, Asia, eastern North , K ). In contrast to P. ×salicifolius, P. America, northern and central Africa, and rarely occurs ×nitens has shorter stipules (without winged ribs), and in Australia and Central America (W and K - sometimes produces fl oating leaves and infl orescences. ). Potamogeton ×salicifolius is one of the most Some individuals of P. ×salicifolius resemble P. lucens frequent Potamogeton hybrids, especially in the United or P. ×nitens so closely that they can not be reliably dis- Kingdom (F and P ) and the North of tinguished by comparative morphology (P , European Russia (B and C ). It usu- Z -G , , ), and such cases ally occurs in lakes and rivers, together with one or need molecular analysis (F and P , K - both parents, as a component of the Potametea com- , B and S , K and munities. At some sites the hybrid dominates among F , ). The hybrid is highly variable, like the other pondweeds (B and S ). many Potamogeton taxa, and its morphological features All established and widespread Potamogeton hybrids can depend on the growing conditions (K ). are taxonomically and ecologically important, however, In fl owing waters P. ×salicifolius has long and narrow they are diffi cult for accurate identifi cation during the leaves, but in shallow ditches its leaves are shorter and fi eld studies (K ). almost as broad as long (P ). In Poland, the distribution of P. ×salicifolius is poorly Specimens of P. ×salicifolius found in the Wigry Lake recognised, because of the lack of herbarium materials are morphologically uniform and similar to P. lucens and misidentifi cation (Z -G ). A new rather than to P. perfoliatus. Moreover, all shoots are station of this interesting hybrid was found in the Wigry vegetative and short (less than cm long). Flowering Lake in August . specimens of the hybrid have not been observed in Po- land (Z -G ). A. Pliszko
DISTRIBUTION IN POLAND were observed in the Gatno Lake in the Kaszuby Lake- AND NEW STATION land (Z -G ). The newly discovered population of the hybrid is small and consists of one Potamogeton lucens and P. perfoliatus have wide dis- cluster of vegetative ramets, occupying an area about tributions and high abundance in Poland, thus, hybridi- m². However, both parental species occur in the Wigry zation between them may occur frequently. However, Lake frequently and abundantly. In comparison with P. ×salicifolius has been hitherto reported from seven other Potamogeton hybrids occurring in Poland such as localities in north-western Poland, mostly from lakes P. ×angustifolius Bercht. & J. Presl ex Opiz and P. ×nitens (Z -G ). (Z -G ), the number of documented The new locality of the hybrid is situated in the stations of P. ×salicifolius is low. south-western part of the Wigry Lake, in the Wigierki Specimens collected from the new station were de- Bay, in the Wigry National Park. This is the fi rst docu- posited in the Herbarium of Jagiellonian University in mented station of P. ×salicifolius in north-eastern Po- Cracow (KRA). land (Fig. ). According to the ATPOL cartogram grid (Z ), the new locality is included in FB square Acknowledgements (cartogram unit km × km). The hybrid grows in I would like to thank MSc Maciej Romański from the shallow water of the littoral zone (about . m deep), Wigry National Park for his help during the fi eld survey. on sandy and silty sediments, together with one of its I am grateful to PhD habilitatus Joanna Zalewska-Gałosz parents, P. perfoliatus. The mesotrophic waters of the and PhD Alexander A. Bobrov for verifi cation of Pota- Wigry Lake in this place are threatened by eutrophica- mogeton ×salicifolius specimens. I also thank the two tion (K et . ). Similar habitat conditions anonymous reviewers for their helpful comments.
F . . Distribution map of Potamogeton ×salicifolius Wolfg. in Poland according to the ATPOL cartogram units ( km × km): ○ – documented localities (Z -G ), ● – new locality New station of Potamogeton ×salicifolius Wolfg. in north-eastern Poland
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