Wyniki wyszukiwania - Biblioteka Nauki

1

The variability of macrophyte metrics used in river monitoring

100%

Szoszkiewicz K. , Zbierska J. , Staniszewski R. , Jusik S.

|

2009

|

tom Vol. 38, No.4

117-126

EN

The study aimed at estimating the reliability of river classification based on macrophytes under differentiated habitat conditions. The studies were carried out between 2002 and 2005, within the EU STAR project and two other local projects. Factors taken into consideration included: shading, habitat modification, and lengths of the survey sections. Polish lowland watercourses were surveyed. The analyzed streams represented a wide range of degradation. Several macrophyte-based metrics were evaluated, including major European systems (MTR, IBMR, TIM, MI, RI) and diversity metrics (number of species, Shannon diversity index, total cover). The reaction of the macrophyte-based metrics examined to habitat factors was compared. It was proved that some of the metrics appeared to be resistant to different sources of variability, thus confirming their usefulness for river monitoring.

2

Issues in the protection of small river valleys: the example of the Kulawa River valley (northwest Poland)

80%

Prajs B. , Antkowiak W.

|

2010

|

tom Vol. 39, No.3

129-136

EN

This paper presents the results of research relating to the vegetation of the Kulawa River valley and its flow lakes - Głuche Duże, Głuche Małe, and Sieczonek. Transformations observed in the flora examined were the result of two overlapping factors: 1. anthropogenic factors - among others, a high phosphorus content in the waters of the river and in nutrients accumulating in the lakes; 2. natural factors, such as a reduced level of subsoil waters. In the protection of river valleys, it is important to diagnose all threats. The diagnosis should be based not only on an evaluation of water quality, but also on the state of the whole environment of the valley.

3

The influence of emergent and submerged macrophyte beds on ciliate communities in a shallow lake

80%

Mieczan T.

|

2010

|

tom Vol. 39, No.4

107-115

EN

Relationships between ciliates and the presence of emergent and submerged vegetation were studied in a shallow lake in eastern Poland. Samples were collected in zones of Phragmites, Typha, Batrachium, Elodea, Stratiotes and from the open water zone. The abundance and biomass of ciliates were significantly higher at sites with structurally most complex plants than in the open water or sparsely vegetated sites. The redundancy analysis indicated that bacterial abundance and total organic carbon were the most influential variables that determine the distribution of ciliates. However, chlorophyll a and Ptot have a lesser influence on the distribution of these microorganisms. Based on differences in macrophyte structure, two groups of habitats with similar patterns of size-related ciliate distribution were distinguished. The first group consisted of three vegetation zones of sparse stem structure and the open water zone, the second group comprised submerged macrophyte species, which were more complex.

4

Struktura makrofitów na tle warunków siedliskowych zbiornika retencyjnego w 8 lat po jego powstaniu

80%

Sender J.

|

2009

|

tom R. 17, nr 5

235-239

PL

Zbiorniki retencyjne to ekosystemy wodne charakteryzujące się specyficzną budową morfometryczną. Jest to bowiem odcinek rzeki podpiętrzony w wyniku przegrodzenia jego doliny zaporą. Stąd zaznaczają się w nim wyraźnie obszary o odmiennym charakterze. Występujące w nich biocenozy wodne są charakterystyczne zarówno dla ekosystemów rzecznych jak i jeziornych. Nie należą one do ekosystemów chętnie zasiedlanych przez roślinność wodną, tak istotną w ich funkcjonowaniu. Zbiornik retencyjny Majdan Zahorodyński - o powierzchni 49 ha powstał w 2000 r. Celem jego budowy była przede wszystkim regulacja stosunków wodnych na tym terenie oraz rekreacyjne użytkowanie zbiornika. Obecna struktura makrofitów oraz właściwości fizyczne i chemiczne jego wód wskazują, iż zbiornik ten jest na etapie wysokiej trofii. Jego fitolitoral zajmujący 32% powierzchni lustra wody jest nieregularny warunkowany, występowaniem wcześniejszych oczek wodnych. Reprezentuje go 11 zbiorowisk roślinnych.

EN

Dammed reservoirs are characterized special morphometrical structure. It is a banked up section of a river. So what, there are places with different conditions within the reservoir. Water biocenosis are specific to lake as well as river ecosystems. Dammed reservoirs belong to ecosystems unwillingly colonize by water plants, such important in water ecosystem functioning. Water reservoir Majdan Zahorodyński with a surface 49 ha came into existence in 2000. The main goal its building was hydrological regime regulation of region as well as recreational using. The present structure of macrophytes and physical and chemical properties of water shoved that investigated reservoir is in the high eutrophy stage. Phytolittoral was irregular and covered 32% of water surface. 11 plant communities created the phytolittoral.

5

Does charophyte meadow induce the spatial heterogeneity of water abiotic properties of a tachymictic Lake?

70%

Pełechaty M.

|

2007

|

tom R. 15, nr 1

24-29

EN

The study objective was to find out whether extensively developed charophyte meadow (built by Chora tomentosa) induce the spatial heterogeneity of basie physical-chemical water properties of a large, clearwater and tachymictic Lake and, so, with a long period of water overturn (Lake Lednica, Wielkopolska Region, mid-Western Poland) . Current trophic state might be assumed as moderately eutrophic with impressive water clariry. Submersed vegetation is well developed and predominated by charophytes forming dense beds. In the period of intense development of vegetation (between 17th May and 6th July 2004) physical-chemical analyses (water temperature, pH, oxygen concentration, conductMty, total dissolved substances) were performed five times at five sampling sites. Three of them were macrophyte-free open water regions (with varied contribution of charophytes in the phytolit-toral zone) and two further were shallow littoral sites: one close to a bathing place with sparse Tolypella glomerata specimens and the other in dense Chora tomentosa bed. The results showed lower conductivity and TDS values, and higher pH and the concentration of oxygen inside charophyte meadow as compared to the rest of sampling sites. By contrast, at the other littoral site but without plant cover conductivity and TDS revealed the highest values. Results are discussed in the light of habitat forming power of charophytes contrasted with long water overturned the Lake is subject to.

6

Using macrophytes as trophic state indicators in upland river waters: a case study of the Czarna Maleniecka River

70%

Kopeć D. , Dałkowski R. , Urbaniak P.

|

2010

|

tom Vol. 39, No.1

119-126

EN

The study was conducted on the upper reach of the Czarna Maleniecka River from Furmanów to the ford at Piekło. Nine sampling sites were selected along this 20-km section. Detailed studies of flora and the physicochemical water parameters were performed in the 2004- 2006 period. Data on macrophytes were collected with the Mean Trophic Rank (MTR) method. The results of physicochemical measurements were analyzed in reference to the water quality classification of the Polish Ministry of the Environment. Based on the results of these studies, the authors recommend adding two species, Utricularia intermedia and Glyceria fluitans, to the list of bioindicators.

7

Interactions of Ipomoea aquatica and Utricularia reflexa with phytoplankton densities in a small water body in northern Nigeria

70%

Chia M. A. , Adelanwa M. A. , Ladan Z. , Iortsuun D. N. , Adanyi S. E. , Stephen B. J.

|

2012

|

tom Vol. 41, No. 2

39-47

EN

The interactions of Ipomoea aquatica and Utricularia reflexa with phytoplankton densities were studied in a small water body in Zaria, Nigeria from June to November 2007. The negative effects of both macrophytes on 10 out of 15 phytoplankton taxa, including Staurastrum sp., Netrium sp., Ulothrix sp., Marssionella sp. and Closterium sp. were differentiated from other environmental effects. U. reflexa, on the other hand, showed positive associations with species like Actinocyclus sp., Palmellopsis sp., Spirotaenia sp., Microcystis sp. and Marssionella sp. Qualitative phytochemical screening and FT-IR analyses confirmed the presence of glycosides, anthraquinone, saponins, steroids, triterpenes, flavonoids, and alkaloids in Ipomoea aquatica and Utricularia reflexa. The observed variations in phytoplankton community dynamics were closely related to the presence of these macrophytes as well as the environmental conditions in the pond.

8

Effects of submerged macrophytes on the concentrations of phosphorous and chlorophyll a under experimental conditions

70%

Tarkowska-Kukuryk M. , Pęczuła W. , Mieczan T. , Płaska W. , Rechulicz J.

|

tom XII

9

Influence of habitat conditions on the occurrence of epiphytic invertebrate fauna in oxbow lakes

70%

Tarkowska-Kukuryk M. , Płaska W. , Mieczan T. , Rechulicz J. , Pęczuła W.

|

2016

|

tom XIII

10

Crustacean communities as food resources for fish in shallow Polesie lakes with contrasting development of submerged macrophytes

70%

Adamczuk M. , Kornijów R.

|

2011

|

tom Vol. 40, No.1

11-18

EN

The aim of the research was to evaluate crustacean forage resources for fish in five shallow lakes varied in respect to species richness and coverage of submerged macrophytes, and thus representing different alternative stable states. The results revealed that lakes with a high or moderate abundance of macrophytes and moderate visibility (macrophyte-dominated Lake Rotcze, phytoplankton-macrophyte dominated lakes Sumin and Głębokie) displayed reach crustacean forage base for fish. Poor feeding conditions were found in two extremely different lakes: turbid phytoplankton-dominated Lake Syczyńskie devoid of macrophytes, and heavily vegetated, clear-water macrophytedominated Lake Kleszczów. Possible reasons for these differences are discussed.

11

Effects of grass carp introduction on macrophyte communities in a shallow lake

70%

Krupska J. , Pełechaty M. , Pukacz A. , Ossowski P.

|

2012

|

tom Vol. 41, No. 1

35-40

EN

In 2002, 2005 and 2007 vegetation and physicochemical properties of pelagial water were investigated in a shallow mid-forest lake. In 2002, the highest phytocoenotic diversity was recorded; charophytes and vascular submerged macrophytes formed their own extensive communities. After stocking with grass carp (Ctenopharyngodon idella Val.) in 2002, reduction of water transparency, as well as changes in qualitative and quantitative composition of macrophyte communities were observed. Submerged vegetation declined during subsequent growing seasons. Charophyte meadows vanished first. The introduction of grass carp appeared to be a potential trigger for the rapid changes observed in the vegetation.

12

Relationships between epipelic diatoms, aquatic macrophytes, and water quality in Akarçay Stream, Afyonkarahisar, Turkey

70%

Kargioglu M. , Serteser A. , Kivrak E. , Içaga Y. , Konuk M.

|

2012

|

tom Vol. 41, No. 1

74-84

EN

The Akarçay is the most important stream in the Afyonkarahisar region in central Turkey. In this study, the relationships between epipelic diatoms, macrophytes, and the water quality of Akarçay Stream are presented. According to Canonical Correspondence Analysis (CCA), BOD5, COD, TDS, NH4-N, NO2-N, and PO4-P had the most significant effects on the diatom and macrophyte community structures of the stream. According to CCA and Correspondence Analysis (CA), dominant diatom species and macrophytes constituted two groups, eutrophic and polluted. While eutraphentic taxa were abundant among upstream diatoms, hypereutraphentic taxa were found downstream in the Akarçay. The diatom assemblages in the sites upstream were generally characterized by an abundance of ß-mesosaprobous and .-mesosaprobous species, while the diatom assemblages downstream had a very high abundance of polisaprobous species. Eutrophic and hypertrophic macrophyte taxa (such as Lemna trisulca, Potamogeton nodosus, and Ranunculus sp.) covered a high percentage of the stream bottom. Both diatom indices and macrophyte indices with the exception of the Biological Macrophyte Index of Rivers (IBMR) were correlated with BOD5, COD, TDS, NH4-N, NO2-N, PO4-P, and EC. Physicochemical variables, diatom and macrophyte taxa and the results of diatom and macrophyte indices indicated that the Akarçay stream basin is eutrophic and organically polluted.

13

The impact of biometric parameters of a hydromacrophyte habitat on the structure of zooplankton communities in various types of small water bodies

70%

Kuczyńska-Kippen N. , Nagengast B. , Joniak T.

|

2009

|

tom Vol. 38, No.2

99-108

EN

Hydromacrophyte habitats, which can differ in a multiplicity of biometric parameters, are among the most important factors affecting zooplankton community structure. The main goal of this work was to determine the impact of plant habitat parameters expressed by density, biomass, and plant volume along with chemical features on the composition and dynamics of rotifer and crustacean communities. A number of small water bodies of different origin (12) located in different catchment areas of the Wielkopolska region were analyzed. It was found that helophytes and nymphaeids had the highest biomass and the lowest stem density, while elodeids were of the lowest biomass and the greatest stem density. Similarity analysis confirmed this distribution of biometric parameters among particular ecological groups of macrophytes. The greatest numbers of zooplankton were noted among vegetated zones, which supports the idea of zooplankton using macrophytes as anti-predator refuge. Based on the study of a total of 23 plant stands, it was found that macrophyte biomass and the density of the plant habitat were the strongest predictors of three biometric parameters of zooplankton abundance.

14

Algae assemblages in the Rąbień peat-bog reserve

60%

Rakowska B. , Sitkowska M.

|

2010

|

tom Vol. 39, No.2

63-74

EN

Due to anthropogenic stress, the character of the Rąbień peat-bog reserve is changing, and large parts of it are being transformed into a transitional peat-bog. During more than 23 years of research, considerable changes have been noted in water pH (from 4.63 to 6.64), trophic status, and the species composition of algae. The subject of the research carried out in 2004-2005 were Bacillariophyceae and Chlorophyta. A decrease was observed in the number of species characteristic of high peat-bogs in favor of alkaliphilic species and those occurring in eutrophic waters.

15

Do physical-chemical water properties reflect the macrophyte and open water induced spatial heterogeneity of a shallow lake?

60%

Pełechaty M.

|

2006

|

tom Vol. 35, No.4

369-386

EN

The aim of this study was to determine if water properties reveal spatial variability related to the presence or absence or types and structures of vegetation in a shallow lake with a long period of water overturn (Lake Jarosławieckie, Wielkopolski National Park, midwestern Poland). Results of a two-year study indicate the absence of statistically significant differentiation among the studied macrophyte communities and open water areas. Temporal changes appeared to be more significant. With the exception of temperature, pH, and conductivity, studied properties showed lower values during the vegetative seasons in comparison with those in spring (total phosphorus) or both spring and fall (total nitrogen). Spatial versus temporal heterogeneity and the differentiation of water properties are discussed in light of data from the literature regarding other lakes.

16

Changes in the spatial structure of submerged macrophytes in Lake Rotcze (Łęczna-Włodawa Lakeland)

60%

Lorens B. , Sugier P.

|

2010

|

tom Vol. 39, No.4

65-73

EN

The aim of this study is to present short-term changes in the spatial structure of water vegetation in Lake Rotcze. Field studies were carried out during the growing seasons of 2000 and 2005. The obtained results allowed to estimate the following parameters that characterize the spatial structure of macrophytes: species frequency in particular ecological groups, the average vegetation cover in these groups, the average cover of particular species, both in the whole reservoir and in different depth ranges, as well as the PVI (Percent Volume Infested) coefficient for ecological groups. The frequency and cover of some species and ecological groups of macrophytes changed during the study period.

17

Przekształcenia struktury jakościowej i ilościowej makrofitów w mezotroficznym jeziorze Piaseczno (Pojezierze Łeczyńsko-Włodawskie) w latach 1996-2006

51%

Sender J.

|

2007

|

tom R. 15, nr 2

64-69

PL

Jezioro Piaseczno należy do jednych z najciekawszych przyrodniczo jezior Pojezierza Lęczyńsko-Włodawskiego. Jeszcze do lat 50. określane było jako jezioro o charakterze oligotroficznym, w latach 70. - amezotroficzne. Obecnie niektóre cechy wód jeziora wskazują na zaawansowany proces eutrofizacji [18]. Ze względu na ogromne tempo tych zmian w ostatnich latach podjęto próbę oceny zmian struktury jakośclowej oraz zasięgu występowania makrofitów, ich biomasy, a także frekwencji i dominacji poszczególnych gatunków makrofitów w ciągu ostatnich 10 lat. Powierzchnia zasiedlana przez makrofity znacznie zmieniła się z 29% w 1996 r. do 39% 2006 r., znacznie zwiększył się także udział makrofitów wynurzonych, a zwłaszcza ich zagęszczenie i biomasa, Zmieniła się także struktura jakościowa makrofitów. Zmniejszyła się bowiem liczba gatunków makrofitów zanurzonych. Największy udział wśród tej grupy makrofi l.ów miały gatunki takie jak Myriophyllum alternifolmm i Elodea canadensis, obecnie dominują w biomasie MyiT.ophyll.um al ternifolmm oraz Nitella flexilis. Jednakże całkowita biomasa makrofitów zwłaszcza wynurzonych znacznie wzrosła. Zmniejszył się natomiast zasięg występowania makrofitów.

EN

Lake Piaseczno belongs to one of the most natural interesting Lake of Leczyńsko-Włodawskie Lakeland. It was characterizerl as a oligotrophic Lake until 50 in 70. as a a-rnezotrophic. Nowadays some of water features of Lake indicale on advanced eutrophication process [18], As a matter of a huge tempo of these changes during the last years qualitative and quantitative changes in the structure of macrophytes were estimated as well as the range of occurrence, biomass, frequency and dominance of particular macrophyte species during the last decade. The surface covered with macrophytes has changed very clearly froni 29% in 1996 to 39% in 2006. The share of ernergent macrophytes considerably increased, especially their density and biomass. The qualitative structure has also changed, The number of submerge macrophyte species has decreased. The highest participation among this group of macrophytes had such species as: Myriophiillum alternifolium and Elodea canadensis nowadays Myriophyllum alternifolium and Nitella Jlexilis were as a dominant. After all total biomass, especially emergent macrophytes. significantly increased. But the range of macrophytes occurrence has decreased.

18

Hydrobotaniczna charakterystyka stawów Poleskiego Parku Narodowego

51%

Sender J.

|

2011

|

tom R. 19, nr 3

145-151

PL

Zasadniczą cechą stawów jest ich zmienność i astatyczność. Roślinność stawów z reguły cechuje duża różnorodność, mimo niewielkiej liczby budujących ją gatunków. Badania obejmowały stawy dwóch kompleksów stawów rybnych położonych na obszarze Poleskiego Parku Narodowego. Stawy te były wcześniej użytkowanych w różny sposób i znajdują się w różnych stadiach sukcesji. Oba kompleksy nie są typowymi stawami produkcyjnymi. Stanowią mozaikę otwartej wody, szuwarów i różnorodnej roślinności wodnej. Badania florystyczne wybranych stawów Poleskiego Parku Narodowego wskazują, iż stanowią dogodne siedliska do rozwoju roślinności. Łącznie w badanych stawach odnotowano 16 zbiorowisk roślinnych. Parametry fizyczno-chemiczne osiągały bardzo zbliżone wartości w obu badanych zbiornikach. Pozwoliło to zaliczyć je do zbiorników żyznych. Zasobniejsze w związki biogenne były wody stawu Głębokiego niż stawu Perkoz. Dzięki ekstensywnemu użytkowaniu rybackiemu stawów PPN mają one naturalny charakter. W badanych stawach to głównie makrofity wynurzone budowały fitolitoral. Badane stawy zasiedlały zbiorowiska charakterystyczne dla wód mezo-, lekko- i eutroficznych.

EN

The principal feature of fish ponds is their changeability and astatic. The vegetation of ponds as a rule characterize the large variety despite the small number of species. The investigations were carried out in rwo complexes of fish ponds located on the area of the Poleskiego National Park. These ponds were earlier used in various way. At present they are in various stages of the plant succession, Both complexes they are not typical productive fish ponds. They create the mosaic of open water, reeds and different water vegetation. Floral investigations of some fish ponds of the Poleski National Park showed, that they create good conditions to the vegetation development. In total there were 16 plant associations. Physical and chemical parameters achieved very approximate values in both studied reservoirs. This analysis confirmed their eutrophic character. The waters of the Głęboki pond were richer in nutrients than the Perkoz pond. The ponds in PPN, thanks to the extensive fishing use have the natural character. The phytolittoral was created mainly with ernergent macrophytes in studied ponds. There were plant communities typical for mezo- and slightly eutrophic waters.

19

Littoral zone flora versus quality of Kielecki Bay waters

51%

Rabajczyk A. , Jóźwiak M.

|

2008

|

tom Vol. 15, nr 12

1359-1368

EN

Environmental assessment is largely based on knowledge about tolerance of organisms to different biotope factors. If upper or lower critical point values ale exceeded for specific organisms in relation to environmental factor, according to Shelford's law of tolerance, it causes a withdrawal of organisms from their natural biotope. This feature is used for biomonitoring the environmental condition. Research was performed in the Kielecki Bay area. It is the water basin located in the city zone of Kielce. It was formed by closing the Silnica River valley by weir at 8 km of the river course. Państwowa Komunikacja Samochodowa (State Motor Transport Company), "Metalowiec" Allotments and City Road Administration in Kielce are users of the bar water, which determines the usage of the areas around the basin for recreational, housing and industrial purposes. Additional loads for Kielecki Bay ale the nearby located class one road which runs towards the city of Lodz and is a source of transportation pollution as well as the city swimming pool which discharges chlorinated water to the basin. The basin is supplied by watercourse, which receives municipal wastewater nom the village of Maslow located near Kielce. The amount and diversity of organic and inorganic compounds getting into the basin influences heavy pollution of Bay waters. Methods used in biomonitoring and instrumental monitoring were applied in this research. A growth of flora typical of basins with unclassified waters containing a huge amount of heavy metals and biogens is a result of human activity. The basin was classified as a dystrophic type. The conducted research shows that anthropogenic influence on the basin should be limited. The research may be also used for correcting the spatial planning solutions.

PL

Diagnoza stanu środowiska w dużej mierze korzysta z wiedzy o tolerancji organizmów na różne czynniki biotopowe. Przekroczenie wartości górnego lub dolnego punktu krytycznego dla określonego organizmu w odniesieniu do czynnika środowiska, zgodnie z prawem tolerancji Shelforda skutkuje wycofaniem się organizmu z charakterystycznego dla niego biotopu. Tę właściwość wykorzystuje się do biomonitoringu stanu środowiska przyrodniczego. Badania przeprowadzono na obszarze Zalewu Kieleckiego. Jest to zbiornik wodny w granicach miasta Kielce, który został utworzony poprzez zamknięcie doliny rzeki Silnicy jazem, na jej 8 km. Użytkownikami wody ze zbiornika są Państwowa Komunikacja Samochodowa, Ogródki Działkowe "Metalowiec" oraz Miejski Zarząd Dróg w Kielcach, co sprawia, że tereny wokół zbiornika zagospodarowane są zarówno na cele rekreacyjne, mieszkaniowe, jak i gospodarcze. Dodatkowymi obciążeniami dla Zalewu jest przebiegająca w bezpośrednim sąsiedztwie droga krajowa w kierunku Łodzi, będąca źródłem zanieczyszczeń komunikacyjnych oraz basen miejski, z którego wprowadzana jest do zbiornika woda chlorowana. Zbiornik zasilany jest ciekiem wodnym stanowiącym odbiornik zanieczyszczeń komunalnych z miejscowości Masłów, położonej w pobliżu Kielc. Ilość oraz różnorodność związków zarówno organicznych, jak i nieorganicznych dostających się do zbiornika powoduje, że wody Zalewu są bardzo zanieczyszczone. W badaniach wykorzystano metody stosowane w biomonitoringu oraz w monitoringu instrumentalnym. Efektem działalności człowieka jest rozwój flory charakterystycznej dla zbiorników o wodach pozaklasowych zawierających dużą ilość metali ciężkich oraz biogenów. Zbiornik zaklasyfikowano jako dystroficzny. Wykonane badania wskazują na konieczność ograniczenia antropogennego oddziaływania na zbiornik. Mogą również być wykorzystane do skorygowania rozwiązań planistycznych związanych z zagospodarowaniem terenu.

20

Kierunki zmian sukcesyjnych składu fitocenotycznego i struktury roślinności wodnej i szuwarowej w Jeziorze Długim (Ziemia Lubuska)

51%

Pronin E. , Pełechaty M. , Pukacz A.

|

2011

|

tom R. 19, nr 4

173-182

PL

Celem niniejszej pracy była charakterystyka roślinności wodnej i szuwarowej płytkiego, polimiktycznego, poddanego presji antropogenicznej Jeziora Długiego zlokalizowanego w pobliżu Rzepina (Ziemia Lubuska - środkowo-zachodnia Polska). Zostały omówione możliwe kierunki sukcesji na podstawie analizy różnorodności fitocenotycznej makrofitów w latach 2003 i 2009. W prezentowanej pracy podjęto próbę określenia przyczyn zmian składu syntaksonomicznego zbiorowisk hydromakrofitów Jeziora Długiego, jak również przedstawiono prognozy stanu roślinności badanego zbiornika wodnego na najbliższe lata. Mimo, że jezioro jest intensywnie wykorzystywane, odnotowano wzrost powierzchni łąk ramienicowych, reprezentowanych przez dwa zespoły: Charetum tomentosae oraz Nitellopsidetum obtusae. Natomiast zmniejszyły się powierzchnie fitocenoz Ceratophylletum demersi (zbiorowiska uważanego za wskaźnik eutrofizacji wód) oraz Potameium luceniis. Sytuacja ta może sugerować dobrą jakość wody, będącą wynikiem wewnątrz-biocenotycznych powiązań prowadzących do poprawy przezroczystości wody. Ten stan jest do pewnego stopnia niezależny od stężenia fosforu, promuje występowanie roślinności zanurzonej, której oddziaływanie utrzymuje korzystny stan czystowodny. Roślinność szuwarowa natomiast w Jeziorze Długim stanowi stabilny element roślinności występującej w jego obrębie. Odnośnie roślinności o liściach pływających w 2009 r. odnotowano, wcześniej niestwierdzone zbiorowisko Nymphaeetum albo-candidae, budowane przez rzadki gatunek Nymphaea borealis.

EN

The aim of the paper was to characterize the short-term changes in the water and rush vegetation of a shallow, polymyctic and anthropogenically impacted Długie Lake, located near Rzepin (Ziemia Lubuska Region, mid-Western Poland). A possible directions of succession were discussed on the basis of the phytocenotic diversity of macrophyte vegetation, analyzed in the years 2003 and 2009. Although the lake is intensely used for recreational purposes, the areas of characean meadows, represented by two charophyte associations: Charetum tomentosae and Nitellopsidetum obtusae., increased. By contrast, the areas of phytocoenoses of Ceratophylletwn demersi (claimed to be an indicator of eutrophication) and Potametam lucentis decreased. This may suggest good water quality being a result of intrabiocoenotic interrelationships leading to an improvement of water clarity. This state (so called clear-water state) is to a certain extent independent on the phosphorus concentrations and promote occurrence of submerged vegetation that - in return - maintain clear waters. Rush vegetation was a stable component of the lake's vegetation. Interestingly, among floating-leaved communities Nymphaeetum albo-candidae, that is ranked among rare association and built by a rare nymphaeid Nymphaea borealis was noted newly in 2009.