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Phytoplankton Metric of ecological status assessment for Polish Lakes and its performance along nutrient gradients

Hutorowicz A., Pasztaleniec A.

Polish Journal of Ecology

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2014

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Vol. 62, nr 3

525--542

EN

This paper outlines the Phytoplankton Multimetric for Polish Lakes (PMPL) – an ecological status assessment method which can be used to implement the European Water Framework Directive (EC, 2000). The PMPL includes abundance parameters of phytoplankton: the metrics: “chlorophyll a”, “total biomass” while the taxonomic composition is partly evaluated by the metric “biomass of cyanobacteria”. All of these three single metrics as well as the final PMPL index values are the same scale and range from 0 to 5. The PMPL can be transformed to a normalized Ecological Quality Ratio (EQR) range from 0 (the worst status) to 1 (the best status). The PMPL method differentiates “stratified” and “unstratified” lake types as well as subdivisions into lakes characterized by a high (>2) or low (<2) lake volume-to-catchment area ratio (VQ). The metrics used and the PMPL index respond to eutrophication pressure expressed by total phosphorus and total nitrogen concentration, the significance of the relationships depends on the tested parameter and the abiotic type of lake. From among the single metrics, the metric “chlorophyll a” was usually found to reveal the strongest significant correlation to both total phosphorus and total nitrogen (Spearman`s coefficient varied from –0.41 to –0.75 and from –0.34 to –0.56, respectively). The weakest correlation with nutrients was noted for metric “biomass of cyanobacteria” (R=–0.13 to –0.62). The PMPL correlated best with TP and TN in unstratified lakes (R=–0.49 to –0.70). The testing of the PMPL index shows a statistically important distinction between Good/Moderate ecological status and confirmed designated boundaries of High/Good and Good/Moderate states.

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A comparison of epilimnetic versus metalimnetic phytoplankton assemblages in two mesotrophic lakes

Napiórkowska-Krzebietke A., Hutorowicz A.

Oceanological and Hydrobiological Studies

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2013

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Vol. 42, No. 1

89-98

EN

The epilimnetic and metalimnetic phytoplankton assemblages were compared in two mesotrophic lakes (L. Hańcza and L. Dejguny, northeastern Poland) and a “metalimnetic niche” is described. Phytoplankton analysis conducted during July and August 2006, 2007, and 2008 indicated that the total phytoplankton biomass in both lakes was relatively small (from 0.6 to 5.2 mg dm-3), with maximum values mainly occurring in the metalimnion. The lowest number of species and diversity indices values were usually observed in the metalimnetic layers. Lake Hańcza was dominated by diatoms (e.g. Cyclotella spp.) whereas Lake Dejguny was mainly dominated by cyanoprokaryotes (e.g. Planktothrix agardhii), with a distinct predominance of diatoms (e.g. Tabellaria flocculosa) in 2007. The common features of the phytoplankton assemblages in both lakes were a tolerance to nutrient and light deficiencies. A cluster analysis of the taxonomic patterns indicated large dissimilarities between the lakes. The phytoplankton assemblages developed under the influence of seasonal conditions, especially in Lake Hańcza. The distinction between metalimnetic and epilimnetic phytoplankton assemblages only appeared in Lake Dejguny.

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Rotifera communities associated with invasive Vallisneria spiralis L. (Hydrocharitaceae) versus native macrophytes in the lakes heated by power stations (Konin lakes, W. Poland)

Ejsmont-Karabin J., Hutorowicz A.

Polish Journal of Ecology

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2011

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Vol. 59, nr 3

569-576

EN

The role that invasive Vallisneria spiralis L. plays in determining the species richness of the rotifer community was examined in the littoral zone of two heated (by power stations) lakes near Konin (W. Poland) (Lake Licheńskie - area 153.6 ha, max. depth 13.3 m and Lake Ślesińskie - area 148.1 ha, max. depth 25.7 m). Vallisneria spiralis is a thermophilic and vegetative reproducing species which has been recorded in the lakes since the 1990s. It spreads very quickly in the lakes, forming monospecific, dense beds which, force out all other submerged vegetation. Samples were collected in August 2004 on 8 littoral stations of Lake Licheńskie and Ślesińskie. Five-liter samples of water (plankton species) and macrophytes (epiphytic species) were elaborated separately. An analysis of the taxonomic structure of rotifer communities inhabiting single-species Vallisneria beds and mixed-species (Vallisneria plus other macrophyte species) beds showed that both communities were relatively rich in species and similar in terms of species composition. A total of 100 species of Monogononta were identified. Single-species Vallisneria beds were inhabited by 77 species, whereas 82 species were found at stations with mixed vegetation. Species diversity was relatively high in both types of macrophyte assemblages. Numbers of rotifer species inhabiting the single-species Vallisneria beds are among the average values observed in a littoral zone rich in macrophyte species from lakes of different morphometry and trophic state. The above observations confirm part of the conclusions from literature that invasions by new plant species do not always lead to a decline in the habitat value for native animals. Otherwise, the invaded plant creates the habitat easily colonized by the native plankton and epiphytic invertebrates.

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Spatial distribution of rotifers (Rotifera) in monospecies beds of invasive Vallisneria spiralis L. in heated lakes

Ejsmont-Karabin J., Hutorowicz A.

Oceanological and Hydrobiological Studies

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2011

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Vol. 40, No.4

71-76

EN

Species abundance and richness of rotifer communities occupying monospecies beds of Vallisneria was studied in Lake Licheńskie included in the open cooling system of heat and power stations. Differences were found in rotifer numbers, species composition and diversity between sampling points within the same location and between the locations. Factors that seem to be responsible for the high diversity of rotifer communities inhabiting Vallisneria beds are: large-scale horizontal diversity (between macrophyte patches), small-scale horizontal diversity (within patches) and the high vulnerability of Vallisneria epiphyton to disturbances caused by wave action.

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Long-term changes of phytoplankton in Lake Niegocin, in the Masurian Lake Region, Poland

Napiórkowska-Krzebietke A., Hutorowicz A.

Oceanological and Hydrobiological Studies

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2006

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Vol. 35, No.3

209-226

EN

The objective of this study was to determine the change in phytoplankton biomass in Lake Niegocin following modernization of the sewage treatment plant in Giżycko, Poland in 1994. Phytoplankton samples were taken from March to November 1991 – 2001, and chlorophyll levels were determined from 1986 through 2001. High levels of total phytoplankton biomass (max. 8.2 mg l-1) and chlorophyll concentrations (max. 93.9 ?g l-1) were recorded in Lake Niegocin up to 1994. Filamentous cyanoprokaryotes (90%), mainly Planktothrix agardhii and Aphanizomenon flos-aquae, were the most abundant taxa in summer. After modernization of the wastewater treatment plant (1995 to 1999), there was a change in the composition of the phytoplankton, biomass decreased threefold and chlorophyll concentrations fourfold, with dinoflagellates (Peridinium sp. div., Ceratium hirundinella) becoming dominant in the summer. However, increased biomass (max. 6.3 mg l-1) and concentrations of photosynthetic pigments (max. 46.5 ?g l-1) occurred in 2000 and 2001, with the summer phytoplankton dominated by cyanoprokaryotes (e.g. Microcystis aeruginosa, Leptolyngbya thermalis).

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Rozmieszczenie wybranych gatunków ramienic w Polsce

Hutorowicz A.

Ekologia i Technika

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2006

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R. 14, nr 3

123-128

PL

W pracy przedstawiono wstępne wyniki prac związanych z przygotowaniem komputerowej bazy danych o rozmieszczeniu ramienic w Polsce. Analizowano informacje zawarte w publikacjach pochodzących z dziewiętnastego i dwudziestego wieku.

EN

The paper presents preliminary results of work aimed at developing a database of the distribution of stoneworts in Poland. Among 30 species recorded in inland waters in Poland, the most common were Chara contararia, C. globularis, C. tomentosa and Nitellopsis obtusa. The rare species Chara braunii and Lychnothamnus barbatus were most frequently reported from lake-rich areas, except for C. braunii which grows in fishponds in southern Poland.

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Morphologic variability of Dinophyceae from the genus Ceratium in a mesotrophic Lake Wigry (Poland)

Hutorowicz A.

Polish Journal of Ecology

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2000

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Vol. 48, nr 1

89-95

EN

In August 1996 studies were carried out to determine size of cells from the genus Ceratium Schrank 1793 in a deep, mesotrophic Lake Wigry (north-east Poland). Two species were found to co-exist in the lake, characterised by clearly different morphologic features: C. hirundinella (O. F. Muller) Dujardin 1841 and C. furcoides (Levander) Langhans 1925.