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

• Autorzy: Kufel L. , Strzałek M. , Wysokińska U. , Biardzka E. , Oknińska S. , Ryś K.
• Języki publikacji: EN

Abstrakty

EN

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 [mu]g P-PO4 L[^-1] for L.minor and 0-4.2 mg N-NO3 L[^-1] and 0-371 [mu]g 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 [plus or minus] 1.11 mg N g[^-1] and 0.97 [plus or minus] 0.07 mg P g[^-1] in L. minor and 6.10 [plus or minus] 1.85 mg N and 1.25 [plus or minus] 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.

Słowa kluczowe

EN

growth rate; Lemna minor; luxury consumption; nutrient resources; Spirodela polyrhiza

PL

odżywczye zasoby; rzęsa drobna; Spirodela wielokorzeniowa; tempo wzrostu

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2012
• Tom: Vol. 60, nr 2
• Strony: 241--249
• Opis fizyczny: Bibliogr. 32 poz.,Rys., tab.,

Twórcy

autor

Kufel L.

autor

Strzałek M.

autor

Wysokińska U.

autor

Biardzka E.

autor

Oknińska S.

autor

Ryś K.

• Department of Ecology and Environmental Protection, University of Natural Sciences and Humanities in Siedlce, 08-110 Siedlce, Prusa 12, Poland,

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