Oceanological and Hydrobiological Studies International Journal of Oceanography and Hydrobiology Vol. XXXVIII, No.1 Institute of Oceanography ISSN 1730-413X (121-138) 2009 University of Gdańsk eISSN 1897-3191 Received: Accepted: DOI 10.2478/v10009-009-0001-0 Review paper February 02, 2008 May 20, 2008 The distribution of green algae species from the Ulva genera (syn. Enteromorpha; Chlorophyta) in Polish inland waters Beata Messyasz1, Andrzej Rybak2 Department of Hydrobiology Adam Mickiewicz University, Institute of Environmental Biology ul. Umultowska 89, 61 – 614 Poznań, Poland Key words: Enteromorpha, Ulva, Chlorophyta, macroalgae, distribution Abstract Marine algae in inland waters in Poland have been rarely recorded. The distribution of 5 species and 1 subspecies of the Ulva genus (syn. Enteromorpha, Chlorophyta) observed in different inland aquatic ecosystems is reported. The algal distribution was established on the basis of the available literature, unpublished material, and oral reports. Information about the algal morphology and habitat conditions, from all of the 58 reported locations of ulvas in Poland, were assimilated and are presented here. The most widespread species of Ulva in inland waters in Poland was U. intestinalis (syn. Enteromorpha intestinalis) reported at 34 sites, while the rarest species was U. paradoxa (syn. Enteromorpha paradoxa), recorded at 2 sites. Species of Ulva have been reported at a range of inland aquatic ecosystems, but most commonly in lakes and small water-courses, such as ditches, channels and creeks. Most of the reported sites of penetration of Ulva (Enteromorpha) inland are concentrated in northwestern and central Poland. 1 2 messyasz@amu.edu.pl rybakandrzej@interia.eu Copyright© by Institute of Oceanography, University of Gdańsk, Poland www.oandhs.org 122 B. Messyasz, A. Rybak INTRODUCTION Numerous papers outline the inland distribution of macroalgae such as stonewort (Dąmbska and Karpacki 1954, Wood and Imahori 1959), resulting from the fact that there are several stonewort species, which are commonly occurring and are often characteristic of freshwater habitats. Information on the inland distribution of other macroalgae such as ulvas (Göppert and Cohn 1850, Preuschoff 1883, Kozłowski 1890, Raciborski 1910, Marczek 1954, Pliński 1971) or red algae (Raciborski 1888, Krawiecowa 1954, Kadłubowska 1960) is much less detailed. Therefore, the aim of this paper is to fill the gap in studies on the distribution of native Polish algae belonging to the genus Ulva (Enteromorpha) (Blomster et al. 1998, 2000; Hayden at al. 2003). Species of Ulva are primarily marine taxa found in saline and salty waters (Pliński et al. 1982, Haroon et al. 1999, Lee 1999, Kirchhoff and Pflugmacher 2002, Romano et al. 2003, bikowski et al. 2005), but they can also proliferate in freshwater habitats. Most studies concerned with Polish examples of this group of algae examine sites located on the Baltic seashore, with only a few reports on their distribution in inland Poland (Kozłowski 1890; Raciborski 1910; Torka 1910; Wysocka 1952; Marczek 1954; Piotrowska 1961; WilkońMichalska 1963; Podbielkowski 1969; Pliński 1971, 1973, 1973a; Kowalski 1975; Sitkowska 1999; Messyasz – in press; Messyasz and Rybak 2008). This is at least in part as a result of these species having rarely appeared in inland waters (Starmach 1970), there being few potential sites at which long term survival of the species is possible. However, in the middle of the 20th century these species started to proliferate in anthropogenically impacted environments like marl pits, peat bogs, and ponds, where chloride concentrations are low or variable. Despite reports of such occurrences, little is known about the ecology of the genus in the new habitats, or the consequences of their occurrence in limnic waters (Kowalski 1975, Sitkowska 1999, Valadimirescu 2007, Messyasz – in press). The Ulva (Enteromorpha) genus now includes over 130 species, and has repeatedly caused taxonomic difficulties (Koemann and Holk 1981, 1982; Bliding 1963). Ulva species are very difficult to identify because morphological differences between taxa are often slight (Leskinen et al. 2004), and so comparisons of morphological structures alone are insufficient to identify to species level. Rather, the colour and the texture of the thalli, the structure and arrangement of cells in different parts of the thallus, the structure of chromatophores, the number of pirenoids, and deviations from the reproductive cycle must all be investigated in order to ascertain identification (Koemann and Holk 1981, 1982; Bliding 1963, 1968). The ecology of marine green algal species has been analysed on numerous occasions (Bliding 1963, Poole and Copyright© by Institute of Oceanography, University of Gdańsk, Poland The distribution of green algae species 123 Raven 1997, Hayden et al. 2003), yet such analyses are insufficient to establish the taxonomy of Ulva species (Blomster et al. 1998, 2000; Coat et al. 1998). In addition to morphological deviations of the thallus from a nomenclature type, age related cytological changes are often observed, as well as variations in the phase of the development cycle (gametophyte, sporophyte), and depend on the time of the year in which the thallus was collected (Koeman and Van Den Hoek 1982, Leskinen et al. 2004). In order to reduce mistakes in the identification of closely related species, molecular techniques can be employed (Blomster et al. 1998, 2000; Hayden et al. 2003, Leskinen et al 2004). In fact, these methods have initiated the revision of common assumptions in the taxonomy of ulvas. As a result, the number of species Enteromorpha (135) and of Ulva (140) established prior to the late 1990s has been reduced (Index Nominum Algarum 2002), and their systematization put in order (Hayden et al. 2003). The tools of molecular genetics, particularly SDS PAGE and RFLP - PCR (Coat et al. 1998, Blomster et al. 1998, 2000; Tann et al. 1999, Rouxel et al. 2001, Hayden et al. 2003, Leskinen et al. 2004, Kagami et al. 2005), have enabled quick methods to discriminate between Ulva species that are morphologically very similar (Coat et al. 1998; Blomster et al. 1998, 2000; Hayden et al. 2003; Leskinen et al. 2004), as well as connecting Entermorpha with Ulva, these genera being more closely related than had previously been suspected (Blomster et al. 1998, Hayden et al. 2003). Currently more than 20 species that were previously assigned to Enteromorpha are now included in the Ulva genus (Blomster et al. 1999, Malta et al. 1999, Tan et al. 1999). A further 110 species will be examined in the near future in order to discriminate relationships between the taxa (Hayden et al. 2003). This paper aims to clarify knowledge about the current distribution of species of Ulva in inland Polish waters. The data indicate the direction and scope of the gradual expansion of these halophilous organisms in Polish freshwaters. Further, the results are concerned with present geobotanics and nature protection issues, in considering the bioindicative function of Ulva, with particular relevance to the protection of freshwaters. Three maps, which include physico-chemical data of the sites, show the current and historic distribution of one subspecies and five species of ulvas observed in Poland from 1849 to 2008. MATERIALS AND METHODS The basic material on which this paper is founded are reports identifying species of Enteromorpha in Polish inland ecosystems (Siemińska 1990, Siemińska and Pająk 1992), comprising more than 20 articles, notes, and other written accounts and four unpublished reports. www.oandhs.org 124 B. Messyasz, A. Rybak The distribution of the algal species is presented on the basis of a carthogram. Poland was divided into 3646 squares using the ATPOL grid developed for the Distribution Atlas of Vascular Plants in Poland (Zając and Zając, 2001), of which the basic unit is a 10 km × 10 km square. The location of every site of observed ulvas in Poland was supplemented with tables that include a description of the site. Each table contains information on basic morphometric data of the particular species of Ulva (length and width of the thalli and cells, as well as the morphology of the thallus), physicochemical parameters of the site, and the type of ecosystem in which the sample was found. Species names and their synonyms are cited after Starmach (1972), while the revisions of names postulated and employed by Bilding (1963), Blomster et al. (1998), and Hayden et al. (2003) are accounted for. Maps show the distribution and characteristics of sites where Ulva species have been observed. Symbols used are: 1. The location of the site: ○ - sites observed prior to 1930; ● - sites observed between 1950 and 2008; □ - there are a few reported sites of the species in one square of the ATPOL grid. 2. General number of sites: for example: (1, 2); the first digit – sites mentioned prior to 1930; the second digit – sites reported between 1950 and 2008. 3. Other: * - information on the site is an oral account. RESULTS Ulva compressa (L.) 1753 syn. Conferva compressa (Linnaeus) Roth 1797, Tubularia compressa (Linnaeus) Roussel 1806, Scytosiphon compressus (Linnaeus) Lyngbye 1819, Fistularia compressa (Linnaeus) Greville 1824, Solenia compressa (Linnaeus) C. Agardh 1824, Ilea compressa (Linnaeus) Gaillon 1828, Fistularia intestinalis var. compressa (Linnaeus) J.P. Jones & Kingston 1829, Hydrosolen compressus (Linnaeus) Martius 1833, Enteronia compressa (Linnaeus) Chevallier 1836, Enteromorpha compressa (Ness) Greville 1840, Enteromorpha vulgaris var. compressa (Linnaeus) Edmondston 1845, Ulva enteromorpha var. compressa (Linnaeus) Le Jolis 1863, Enteromorpha usneoides J. Agardh 1883, Enteromorpha intestinalis var. compressa (Linnaeus) Copyright© by Institute of Oceanography, University of Gdańsk, Poland The distribution of green algae species 125 Rosenvinge 1893, Enteromorpha intestinalis subsp. compressa (Linnaeus) M.W.R.N. de Silva & E.M. Burrows 1973, Enteromorpha complanata (Kützing) Silva 1996. This species has been observed at four positions in the Wielkopolska area (Fig. 1, Tab. 1). Fig. 1. Locations of recorded distributions of Ulva compressa, Ulva paradoxa and Ulva prolifera at Polish inland sites. Ulva paradoxa C. Agardh 1817 syn. Enteromorpha paradoxa (C. Agardh) Kützing 1845, Enteromorpha erecta (Lyngbye) J. Agardh 1883, Enteromorpha flexuosa subsp. paradoxa (C. Agardh) Bliding 1963, Enteromorpha plumosa (Kützing) Bliding 1963, Conferva paradoxa Dillwyn 1809. Before 1930 this species was not recorded in inland waters. Subsequently it has been reported at two sites: the peaty hole and lake (Fig. 1, Tab. 2). www.oandhs.org B. Messyasz, A. Rybak 126 Table 1 Information concerning the site locations, morphometric features and habitats of Ulva compressa. Author Site location Type of ecosystem and date of reported appearance Length and width Length and width of cells of thallus (μm) (cm) Branching of thallus Physico-chemical parameters -1 (mg l ) (VII-VIII – 1993-2006) Wielkopolskie Province, surroundings of Gołańcz Messyasz (in press) 10 – 15 5.8 – 14.7 6 – 20 0.03 – 2 Lake Laskownickie present O2 pH NH3 NO3 3PO4 NaCl cond. 0.0 – 9.8 7.47 – 8.68 0.42 – 1.05 0.00 – 0.70 0.00 – 1.01 98 – 133 648 – 1136 O2 pH NH3 NO3 3PO4 NaCl 0.25 – 0.80 7.56 – 9.22 0.23 – 0.74 0.04 – 1.02 0.08 – 0.29 537 – 776 O2 pH NH3 NO3 3PO4 NaCl 0.50 – 4.70 7.71 – 9.69 0.12 – 2.61 0.04- 1.11 0.47 – 0.97 513 – 604 O2 pH NH3 NO3 3PO4 NaCl 3.0 – 5.4 7.20 – 7.89 0.05 – 0.33 0.05 – 0.09 0.003 – 0.050 702 – 740 (VII-X – 2004, 2006- 2007) Messysz and Rybak (2008a) Wielkopolskie Province, Poznań Stream Dworski Rów 1.2 – 20 0.02 – 2 Stream Michałówka 2 – 180 0.05 – 8 Stream wiątnica 2.3 – 19.5 0.03 – 2 present 9.6 – 16 6.2 – 11 present present cond.- conductivity Table 2 Informations concerning the sites, morphometric features and habitat of Ulva paradoxa and Ulva prolifera. Author Site location Pliński 1971, 1973 Łódzkie Province, surroundings of Łęczyca Kowalski 1975 West Pomeranian Province, surroundings of Lubczyny Type of the ecosystem and the period of appearing Branching of thallus 12 – 15 21 – 27 present, little up to 1530 μm NaCl 700 – 3600 10 – 15 to 0.15 4.8 – 12.5 4.8 – 12.5 present pH 3PO4 Cl 8.0 0.17 95.80 Ulva paradoxa (V – VII, 1968 – 1969) 2.1 – 7.8 peaty hole 0.0085 – 0.0154 (IX, 1970) Lake Dąbskie Physico-chemical parameters -1 (mg l ) Length and width of cells (μm) Length and width of thallus (cm) Ulva prolifera (1925) Liebetanz 1925 Kuyavia – Pomeranian Province: - Słoniawy surroundings of Szubin drainage ditch n.d. n.d. n.d. n.d. - Inowrocław drainage ditch n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. 5.8 – 14.5 90 – 160 9 – 11 11 – 13 present, little up to 1600 μm n.d. n.d. n.d. (1961) Piotrowska 1961 West Pomeranian Province, surroundings of Kołobrzeg Pliński 1971, 1973 Łódzkie Province, surroundings of Łęczyca Dąmbska 1976 Wielkopolskie Province, surroundings of Konin water-courses, ponds (V – VIII, 1968 – 1969) peaty hole NaCl 700 – 3600 (1970 – 1971) Lake Wąsowsko-Mikorzyńskie n.d.- no data Copyright© by Institute of Oceanography, University of Gdańsk, Poland n.d. The distribution of green algae species 127 Ulva prolifera O. F. Müller 1978 syn. Solenia compressa var. prolifera (O.F. Müller) C. Agardh 1824, Enteromorpha compressa var. prolifera (C. Agardh) Greville 1840, Enteromorpha salina Kützing 1845, Enteromorpha compressa f. prolifera (O.F. Müller) Ahlner 1877, Enteromorpha prolifera (O. F. Müller) J. Agardh 1883, Enteromorpha intestinalis f. prolifera (O.F. Müller) Hauck 1884, Ulva enteromorpha f. prolifera (O.F. Müller) Van Heurck 1908, Enteromorpha torta (Mertens) Reinhold 1893, Burrows 1991. This species was reported at two locations in drainage ditches in 1925. In the second half of the 20th century it was reported at three sites, in the regions of Kołobrzeg, Łęczyca and Konin (Fig. 1, Tab. 2). Ulva flexuosa Wulfen 1803 syn. Conferva flexuosa Roth 1800, Conferva compressa var. flexuosa (Wulfen) Roth 1806, Enteromorpha intestinalis var. tubulosa Kützing 1845, Enteromorpha flexuosa (Wulfen) J. Agardh 1883, Enteromorpha tubulosa (J. Agardh) Lakowitz 1929, Enteromorpha compressa var. flexuosa (Wulfen) G. Hamel 1931, Enteromorpha prolifera var. flexuosa (Wulfen) M.S. Doty 1947. This species was reported at ten locations, which had increased chloride concentrations in the water, mainly in the West Pomeranian Province (Fig. 2, Tab. 3). Table 3 Information concerning the site locations, morphometric features and habitats of Ulva flexuosa. Author Site location Type of ecosystem and date of reported appearance Length and width of thallus (cm) Length and width of cells (μm) Branching of thallus Marczek 1954 Silesian Province, Biskupice surroundings of Zabrz (IX, 1953) pond up to 83 up to 0.1 13.3 – 46.2 10 – 23 absent Pliński 1971, 1973 Łódzkie Province, Błonie surroundings of Łęczyca (IV - IX, 1968 -1969) 3 peaty holes 6–9 14 – 45 9 – 14 10 – 14 present, little 24 – 3950 μm Kowalski 1975 West Pomeranian Province: - surroundings of Wierzbno (IX, 1970) Lake Miedwie - surroundings of Lubczyny (IX, 1970) Lake Dąbskie - Szczecin, district Nad Odrą (IX, 1970) Pond Portowy - surroundings of A6 road - surroundings of Czarnocin, Warołęki, Podgród - surroundings of Ognica (VI – X, 1970) Canal on Międzyodrze (IX, 1970) Lagun Szczecin (IX, 1970) Canal Piastowski up to 36 0.009 – 0.013 15.0 – 30 12.1 – 18.0 present, little up to 150 μm Physico-chemical parameters -1 (mg l ) O2 8.49 pH 7.5 3PO4 10.0 48.9 NaCl NaCl 700 – 3600 pH NO3 3 PO4 Cl pH 3PO4 Cl pH NO3 3PO4 Cl 7.2 0.25 0.04 38.20 8.0 0.17 95.80 7.3 0.61 0.03 130.50 n.d. n.d. n.d. n.d. - no data www.oandhs.org 128 B. Messyasz, A. Rybak Fig. 2. Locations of recorded distributions of Ulva flexuosa and Ulva flexuosa subsp. pilifera at Polish inland sites. Ulva flexuosa subsp. pilifera (Kützing) Bliding 1963 syn. Enteromorpha flexuosa subsp. prolifera (A. Ag.) Greville This taxon was reported in small channel and pond ecosystems in the surroundings of Szczecin and Łód (Fig. 2, Tab. 4). Ulva intestinalis L. 1753 syn. Conferva intestinalis (Linnaeus) Roth 1797, Tetraspora intestinalis (Linnaeus) Desvaux 1818, Scytosiphon intestinalis (Linnaeus) Lyngbye 1819, Enteromorpha intestinalis (Linnaeus) Nees 1820, Fistularia intestinalis (Linnaeus) Greville 1824, Solenia intestinalis (Linnaeus) C. Agardh 1824, Ilea intestinalis (Linnaeus) Leiblein 1827, Hydrosolen intestinalis (Linnaeus) Martius 1833, Scytosiphon intestinalis var. nematodes Wallroth 1833, Enteronia simplex Chevallier 1836, Enteromorpha vulgaris var. lacustris Edmondston Copyright© by Institute of Oceanography, University of Gdańsk, Poland The distribution of green algae species 129 Table 4 Information concerning the site locations, morphometric features and habitats of Ulva flexuosa subsp. pilifera. Author Kowalski 1975 Site location West Pomeranian Province, Szczecin, surroundings of A6 highway Length and Type of ecosystem and date width of thallus of reported appearance (cm) (VI – X, 1970) 15 – 25 Canal on Międzyodrzu 1.5 – 3.0 Length and width of cells (μm) 14.8 – 19.7 9.9 – 15.6 Branching of thallus Physico-chemical parameters -1 (mg l ) present Łódzkie Province, Piotrowice surroundings of Łód (1984 - 1987) pond 20 – 30 1–2 14.4 – 19.0 12.0 – 14.2 present Łódzkie Province, Kuciny surroundings of Łód (1994 - 1995) pond 20 – 30 1–2 14.4 – 24 12.0 – 16.8 absent Sitkowska 1999 n.d. pH NO3 NO2 3PO4 NH3 NaCl pH NO3 NO2 NH3 NaCl 7.5 – 8 0.39 0.037 0.23 0.5 20 8.5 0.08 0.001 0.5 20 n.d. - no data 1845, Ulva enteromorpha var. intestinalis (Linnaeus) Le Jolis 1863, Ulva bulbosa var. intestinalis (Linnaeus) Hariot 1889, Enteromorpha compressa var. intestinalis (Linnaeus) G. Hamel 1931. Prior to 1930 Ulva intestinalis was reported at 13 locations (Fig. 3). The first inland site of U. intestinalis was located in 1849 in the Lower Silesia Province in Miękinia and Duszniki Zdrój (Göppert and Cohn 1850). In the 19th century U. intestinalis was reported in the Pomeranian Province, where it was present in ditch surroundings of Nidowa (Preuschoff 1883), and at Kuyavia, Pomeranian Province, in the surroundings of Ciechocinek (Kozłowski 1890). Moreover, Kozłowski (1890) reported that thalli of this species were found in ditches in Stary Ciechocinek, in which the waters contained from 127 to 7680 g NaCl m-3. In 1895 – 1896 thalli of U. intestinalis were identified in the Warmia – Masuria Province area in Tolkmick, floating in Lagoon Wi lany (Nitardy 1898). In 1904 it appeared in Elbląg (Nitardy 1904) in the Warmia – Masuria Province. The next reported sites were lake ecosystems at Słoniawy, in the surroundings of Szubin and Inowrocław (Torka 1910). In the Kuyavia – Pomeranian Province (in the surroundings of Ciechocinek) on the 23rd June 1910 U. intestinalis was found in suburban salty waters (Racibórz and Wóycicki 1910). In 1913 it was reported in the old river bed of the Vistula at new sites around Słońsk, in the surroundings of Ciechocinek (Rouppert 1913). In 1925 thalli appeared in the Kuyavia - Pomeranian Province: at Słoniawy, in the surroundings of Szubin, and in Inowrocław. Thalli collected from a drainage ditch at this site achieved lengths of 30 cm and widths up to 0.2 cm (Liebetanz 1925). The last report of U. intestinalis from the 1920s is from the Kuyavia Pomeranian Province area, where thalli appeared in the salty waters of Ciechocinek (Namysłowski 1927). www.oandhs.org 130 B. Messyasz, A. Rybak Fig. 3. Locations of recorded distributions of Ulva intestinalis at Polish inland sites. Further reports of sightings of U. intestinalis are listed in chronological order in Table 5 (see also Fig. 3). DISCUSSION Species of the genus Ulva are cosmopolitan (Bäck et al. 2000, Hayden et al. 2003, Leskinen et al. 2004), being present in all types of sea and ocean waters, except the arctic area (Leskinen et al. 2004). In the Baltic basin they are concentrated in northwestern parts, where higher levels of salinity positively impact on their occurrence (Leskinen et al. 2004). Masses of ulvas frequently accumulate on seashore rocks, where they attach themselves using small hooks (Fish and Fish 1989). Under circumstances favourable for their development these macroalgae can become dominant in the littoral zone, covering rocks or creating free floating Ulva mats up to several square meters in size (Fletcher Copyright© by Institute of Oceanography, University of Gdańsk, Poland The distribution of green algae species 131 Table 5 Information concerning the site locations, morphometric features and habitats of Ulva intestinalis. Author Site location Wysoka 1952 Mazovian Province, - Nowodwory, surroundings of Warszawa Marczek 1954 Lublin Province, Biskupice - Zabrz Wysocka 1954 * Jasielski and * Zabawski 1954 Piotrowska 1961 Wilkoń-Michalska 1963 Kuyavia - Pomeranian Province, Kujawy Mazovian Province, surroundings of Warszawa Silesia Province, Gliwice West Pomeranian Province, surroundings of Kołobrzeg Kuyavia - Pomeranian Province: - Ciechocinek - Mątwy, surroundings of Inowrocław Podbielkowski 1969 Pliński 1971, 1973a Pliński 1973a Kowalski 1975 Masuria province: - Baniocha, surroundings of Warszawa Łódzkie Province, surroundings of Łęczyca Pomeranian Province, surroundings of Lubkowa Length and width of thallus (cm) Length and width of cells (μm) Branching of thallus River Wisła (1952) n.d. n.d. n.d. (IX, 1953-1954) pond up to 40 up to1.25 6.5 – 23.2 3.3 – 13.3 absent (1953) lake (1953) Lake Czerniakowskie n.d. n.d. n.d. n.d. n.d. (1954) swimming pool n.d. n.d. n.d. n.d. (1961) water-courses and ponds n.d. n.d. n.d. n.d. salted waters (1962) n.d. n.d. n.d. n.d. (1962) (1967) clay pit (IV - IX, 1968 -1969) 5 peaty holes (VII - X, 1967-70) Lake arnowieckie (IX, 1970) River Płonia - surroundings of Lubczyny (IX, 1970) Lake Dąbskie - Szczecin, Nad Odrą district (IX, 1970) Pond Portowy Wielkopolskie Province: - surroundings of Gołańcz n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. 5 – 23 0.2 – 1.2 8 – 30 0.05 – 0.5 7 – 18 9 – 18 12 – 18 5 – 10 18 – 42 0.4 – 1.4 7.3 – 27.2 6.5 – 18.1 present, little up to 140 NaCl μm present, little up to 150 Cl μm pH NO3 3PO4 Cl pH NO3 3PO4 Cl pH 3present, little up PO4 to 900 μm Cl pH NO3 3PO4 Cl (IX, 1970) Lagoon Szczecin (IX, 1970) Canal Piastowski River Dymer (VII, 2005) 8.49 7.5 10.0 48.9 700 – 3600 40 7.2 0.25 0.04 38.20 7.1 0.43 0.05 39.70 8.0 0.17 95.80 7.3 0.61 0.03 130.50 n.d. n.d. n.d. n.d. n.d. (V - VII, 1993 - 2006) Lake Laskownickie 13 – 23 5–7 12 – 16 13 – 15 present (V - VII, 1993 - 2006) River Nielba 15 - 17 5-6 12 - 13 14 - 15 present Messyasz (in press) - Wągrowiec O2 pH 3PO4 NaCl n.d. - surroundings of Szczecin Warmia-Masuria Province, Nowe Marcinkowo surroundings of Olsztyn n.d. n.d. (VI - IX, 1970) Lake Miedwie - surroundings of Karsibor Physico-chemical parameters -1 (mg l ) n.d. West Pomeranian Province: - surroundings of Wierzbno - surroundings of Czarnocin, Warołęki and Podgrodzie Endler 2006 Type of ecosystem and date of reported appearance n.d. O2 pH NH3 NO3 3PO4 NaCl cond. O2 pH NH3 NO3 3PO4 NaCl cond. 0.0 – 9.8 7.47 – 8.68 0.42 – 1.05 0.00 – 0.70 0.00 – 1.01 98 – 133 648 – 1136 4.5 – 9.7 6.44 – 8.71 0.49 – 1.59 0.12 – 0.810 0.05 – 1.40 80 – 127 648 – 1136 cond. – conductivity; * - information on the site is an oral account; n.d. – no data www.oandhs.org 132 B. Messyasz, A. Rybak 1996, Callow et al. 1997, Blomster et al. 2002). Ulvas are generally tolerant to periodic decreases in water salinity, and as a result can proliferate in estuaries (Bäck et al. 2000, McAvoy and Klug 2005). However, some species, for example U. intestinalis, do not settle in Baltic waters where the salinity is lower than 2 ppt, and U. compressa was not recorded in the Baltic Sea in areas where the salinity did not exceed 15 ppt (Leskinen et al. 2004). This implies that the distribution of particular species of Ulva in the Baltic basin is more restricted than was previously assumed, and that it depends to a large degree on water salinity (Nielsen et al. 1995, Tolstoy and Willén 1997). Species of Ulva have also been reported in inland salt habitats globally, e.g. in reservoirs located at salt mines or at ore mines in North America (Lois et al. 1975). In addition, they have been observed in big European rivers (Kirchhoff and Pflugmacher 2002) and salty swamps (Fish and Fish 1989). Nine species of Ulva (Table 6) have been identified in Poland (Pankow 1971, Starmach 1972), most of them appearing at the Baltic seashore, primarily near Gdańsk (Lucks 1907, Korna and Medwecka-Korna 1949, Biernacka 1961, Pliński et al. 1982, Haroon et al. 1999), Puck Bay (Starmach 1972, Fronczak and Pliński 1982, Wojtusiak et al. 1984, Boszke et al. 2003, Skwarzec et al. 2003, bikowski et al. 2005) and near Władysławowo (Biernacka 1968). Table 6 Species of Ulva (Enteromorpha) appearing in salt and freshwaters in Poland (see Starmach 1972). Species Enteromorpha torta (Mertes) Reinhold 1893 Enteromorpha prolifera J. Ag. 1882-1883 Enteromorpha ramulosa (Engl. Bot.) Hooker 1833 Enteromorpha flexuosa (Wulf. ex Roth) J. Ag. 1883 Enteromorpha compressa Ness 1820 Enteromorpha linza (L.) J. Ag. 1883 Enteromorpha intestinalis (L.) Link 1820 Enteromorpha clathrata (Roth) Greville 1830 Enteromorpha ahlneriana Blinding 1933 sea ecosystem + + + + + + + + + inland ecosystem + + + + + - Only five Ulva species have been recorded in inland freshwater and salty reservoirs (Göppert and Cohn 1850; Preuschoff 1883; Kozłowski 1890; Raciborski 1910; Torka 1910; Wysocka 1952; Marczek 1954; Piotrowska 1961; Wilkoń-Michalska 1963; Podbielkowski 1969; Pliński 1971, 1973, 1973a; Kowalski 1975; Sitkowska 1999; Messyasz and Rybak 2008; and others). Ulva species are highly mutable, the same species developing into separate forms depending on even slight differences in environmental conditions (higher water temperature, concentrations of nitrate, phosphorus or chlorides, and other physico-chemical parameters) (Starmach 1972, Endler et al. 2006, Sitkowska Copyright© by Institute of Oceanography, University of Gdańsk, Poland The distribution of green algae species 133 1999, Messyasz – in press, Messyasz and Rybak 2008a). This mutability commonly results in identification mistakes, and of establishing new species in the genus. Multiple subspecies and forms previously observed in Poland (Marczek 1954, Piotrowska 1961, Pliński 1971, Starmach 1972, Kowalski 1975) are now assumed to be one species. Synonymous naming of species, subspecies and forms in the Ulva genus is employed in this paper (Blomster et al. 1998, Index Nominum Algarum 2002, Hayden et al. 2003). The distribution of ulvas in Polish waters can be examined with respect to the level of pollution of these waters, as some Ulva species have proved to be very useful bioindicators. Their presence can indicate pollution by heavy metals, increased concentrations of chlorides and nitrate, and increases in the trophy of particular water bodies (Sfriso et al. 1987; Fletcher 1992, 1996; Kautsky 1982; Castilla 1996; Bonsdorff et al. 1997; Valiela et al. 1997; Blomster 1998, 2000; Bäck et al. 2000; Farina et al. 2003; Reed and Russel 1978, 1979; Reed and Moffat 2003; Worm and Lotze 2006). The occurrence of free floating Ulva mats dominated by U. compressa and U. intestinalis can indicate Cd, Cu, Pb, Zn or Mn contamination (Reed and Moffat 2003, bikowski et al. 2005). Such thick Ulva mats, comprised of a couple of species (e.g. mainly U. compressa and U. intestinalis), can cause local disorders in ecosystem functioning in the littoral zone (Fletcher 1996). It can be argued that similar processes are taking place in inland lake and river ecosystems, in which floating mats of ulvas are observed (Messyasz – in press, Messyasz and Rybak – 2008a). FINAL CONCLUSIONS • • • • Five species and one subspecies of the genus Ulva (Entermorpha) were recorded at 58 inland sites in Poland (Fig. 1 - 3). The location of one site of U. intestinalis, reported by Wysocka (1952) was not discovered. The author stated that Ulva was found in one of the lakes in the region of Kujawy, but as a result of insufficient site details, it was not marked on the distribution map of U. intestinalis reported here. The most widespread Ulva species in inland Polish waters was U. intestinalis, the thalli of which were observed at 34 sites (Fig. 3, Tab. 5). The next most widespread were: U. flexuosa, observed at 10 sites (Fig. 2, Tab. 3), U. prolifera, observed at 5 sites (Fig. 1, Tab.2), and U. compressa, observed at 4 sites (Fig 1, Tab. 1). Of the Ulva species reported in inland Poland the rarest species are U. flexuosa subsp. pilifera, found at 3 sites (Fig. 2, Tab. 4), and U. paradoxa, which appeared at 2 sites (Fig. 1, Tab. 2). www.oandhs.org B. Messyasz, A. Rybak 134 • • • • • • • The inland locations of species of Ulva are concentrated in northwestern and central Poland, but single sites were also found in the North and East of Poland. The inland Ulva species were mostly recorded in lake ecosystems (13 reports) or small water-courses and ditches (12 reports). Less numerous habitats (3-7 reports) were brine rivers, canals, and peat bogs. Single reports were observed in freshwater bays, a swimming pool, and mar pits (Tab. 1-5). U. intestinalis was reported at all types of inland water ecosystems, ranging from natural water bodies, such as lakes, rivers, and salt water bodies, to streams and ditches, as well as anthropogenic sites such as fish ponds and mar pits. U. intestinalis was found in 8 Polish lakes and other water bodies, implying that this species can endure a wide ecological range. This assumption is confirmed by the physicochemical parameters of the sites at which the species has been reported (Tab. 5). U. flexuosa, similar to U. intestinalis, has been seen to proliferate in numerous ecosystems of different origin as well as water quality. This species was recorded in lakes, ponds, bog pits, and estuaries (Tab. 3). U. flexuosa subsp. pilifera was found in fish ponds, which were characterised by very low salinities, and in the canal, which has inflows of freshwater (Tab. 4). It is very uncommon for the thalli of species of Ulva to be collected from sites with low chloride concentrations. U. paradoxa and U. prolifera were reported in freshwater ecosystems, such as lakes and ponds, but also in peat bogs, although at each site where these two species were reported chloride concentrations were at least moderately high (Tab. 2). U. compressa was recorded in one lake and three creeks (Tab. 1). This species is tolerant of a wide range of chloride concentrations, which often are of anthropogenic origin, and proliferates in running waters, where water levels frequently fluctuate. 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