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1

Zielony wojownik w natarciu, czyli osoka w ekosystemach wodnych

100%
Strzalek M.
Wiadomości Ekologiczne
|
2004
|
tom 50
|
nr 2
81-107
2

The effect of dense patches of Stratiotes aloides L. on the spatial structure of microcrustacean assemblages in an oxbow lake

63%
Strzalek M., Koperski P.
International Journal of Ecohydrology and Hydrobiology
|
2019
|
tom 19
|
nr 1
3

The usefulness of various indices in the assessment of water quality of a lowland river

51%
Krolak E., Strzalek M., Korycinska M.
International Journal of Ecohydrology and Hydrobiology
|
2009
|
tom 09
|
nr 2-4
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Determination of magnesium, manganese, copper and zinc in infusions of inflorescences and leaves of Solidago canadensis

51%
Krolak E., Bielecka A., Strzalek M.
Journal of Elementology
|
2020
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tom 25
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nr 4
5

Constitutive allelochemicals from Stratiotes aloides L.affect both biomass and community structure of phytoplankton

51%
Kufel L., Pasztaleniec A., Czapla G., Strzalek M.
Polish Journal of Ecology
|
2007
|
tom 55
|
nr 2
The paper presents the results of a study on allelopathic effect of extracts from Stratiotes aloides on natural lake phytoplankton communities grown outdoor in 40 l containers under natural light conditions. The water and plants were taken from an oxbow lake in spring (when S. aloides plants were submerged) and in summer (when plants were floating on lake water surface). Water extracts were prepared from fresh healthy leaves obtained on both sampling occasions. Control containers were supplemented with N and P in amounts similar to those introduced to experimental containers with macrophyte extracts. That way the experimental set up excluded the possibility of phytoplankton limitation by nutrients. Under such conditions the extracts from S. aloides strongly reduced phytoplankton biomass measured as the concentration of chlorophyll a (from 370 to 141 mg chl. a m⁻³ in spring and from 266 to 50 mg chl. a m⁻³ in summer). The inhibition of phytoplankton growth was indirectly confirmed by higher concentrations of available nutrients in experimental versus control containers. The extracts affected also the spring phytoplankton community structure by selective inhibition of diatoms and, to a less extent, of green algae and Cryptophyceae. Similar response of phytoplankton biomass to extracts obtained from submerged and floating S. aloides might suggest that allelochemicals were the constitutive part of macrophyte tissue and their production was not induced by competition between macrophyte and algae.
6

Growth rate of duckweeds (Lemnaceae) in relation to the internal and ambient nutrient concentrations - testing the Droop and Monod models

39%
Kufel L., Strzalek M., Wysokinska U., Biardzka E., Okninska S., Rys K.
Polish Journal of Ecology
|
2012
|
tom 60
|
nr 2
The Monod model describes the relationship between growth rate and ambient nutrient concentration, the Droop model focuses on internal nutrient resources as the driving factor. Both were applied mainly to explain phytoplankton dynamics in lakes or in experimental cultures. Our test plants were two species of duckweeds – Lemna minor L. and Spirodela polyrhiza (L.) Schleiden sampled from 18 natural stands situated in 6 different water bodies. Plants were grown outdoor in original lake water or in mineral media of varying N and P concentrations (0–21 mg N-NO3 L-1 and 0–1853 μg P-PO4 L-1 for L.minor and 0–4.2 mg N-NO3 L-1 and 0–371 μg P-PO4 L-1 for S. polyrhiza). Moreover, we analysed concentrations of mineral forms of N and P in lake water and tissue nutrient concentrations in plants. Tissue N of both plants was significantly correlated with ambient inorganic nitrogen sources, no such relationship was observed for tissue P. The growth rate of both plants measured under experimental outdoor conditions was better explained by tissue N and P variability (the Droop model) than by the external nutrient availability (the Monod model). The latter also failed to fit the growth rate of both plants in artificial mineral media with a decreasing gradient of N and P concentrations. The plants grew at the expense of internal N and P resources which remarkably declined during 9-day long experiments. Calculated minimum tissue contents (11.19 ± 1.11 mg N g-1 and 0.97 ± 0.07 mg P g-1 in L. minor and 6.10 ± 1.85 mg N and 1.25 ± 0.37 mg P g-1 in S. polyrhiza) show that the latter species would be a superior competitor under N limiting conditions and the former – under P limitation. We confront obtained results with literature data on N uptake kinetics and postulate that the luxury consumption of nutrients and plant growth dependent mainly on internal N and P resources might be an adaptation of duckweeds to varying habitat conditions typical of astatic water bodies.
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