Phytoplankton response to changed nutrient level in Lake Peipsi (Estonia) in 1992–2001

Kangur, Külli; Möls, Tõnu; Milius, Anu; Laugaste, Reet

doi:10.1023/b:hydr.0000008574.40590.8f

Cited by 39 publications

(31 citation statements)

References 10 publications

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“…Although many works describe positive correlations between chlorophyll-a and total P in sediments (Chen et al 2003;Kangur et al 2003), the relationships between other algal phytopigments and P contents, as well as with other available macronutrients and micronutrients in sediments-like N, Fe, Cu or Zn-have rarely been explored. These elements are known to have a biological role and their control is becoming more and more important in fish farming (Henley and Yin 1998;Munda and Veber 2004) to control the growth of microalgae.…”

Section: Introductionmentioning

confidence: 99%

Study of phytopigments in river bed sediments: effects of the organic matter, nutrients and metal composition

Rey

Moldes

Dı́az-Fierros

et al. 2008

Environ Monit Assess

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Phytopigment estimation has a considerable interest in the evaluation of freshwater bodies' quality, because it takes into account the synergistic effect of nutrients like phosphorus or nitrogen on algal growth producing eutrophication. Furthermore, their increasing concentration constitutes the first step in the formation of biofilms on the surface sediments, adding a new and very important element to the dynamic nature of the surface sediments. In this study the distribution of phytoplankton--in terms of chlorophyll-a, chlorophyll-b, phaeophytin-a, phaeophytin-b, total carotenoids, total chlorophyll, and total phaeophytin--was evaluated in river bed sediments. Samples collected at sites with low levels of nutrients (P,N) and metal concentrations showed lower phytopigment concentrations than those collected at the sampling sites affected by sources of pollution. Phytoplankton concentrations were directly and highly related to the organic matter concentrations--in particular to the humic fraction--as well as to the total nitrogen (N), total phosphorus (P(T)) and available phosphorus (P(A)) concentrations in sediments. In addition, phytoplankton also correlates positively with Cu, Zn, Fe and Al extracted in oxalate, being Cu the variable that most influences the phytopigment growth. These are essential metals for the metabolism of the phytoplankton, so therefore the increase in metal concentrations can increase algal growth, unless they reach toxic levels.

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Section: Introductionmentioning

confidence: 99%

Study of phytopigments in river bed sediments: effects of the organic matter, nutrients and metal composition

Rey

Moldes

Dı́az-Fierros

et al. 2008

Environ Monit Assess

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“…The three parts of Lake Peipsi have different morphometry, hydrology, trophic states, and composition of biota (Kangur et al, 2003). The northern part, Lake Peipsi sensu stricto (s.s.) is the largest (2611 km 2 ) and has the greatest mean depth (8.3 m).…”

Section: Study Areamentioning

confidence: 99%

Weather conditions influencing phosphorus concentration in the growing period in the large shallow Lake Peipsi (Estonia/Russia)

2014

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“…The lake is one of the most thoroughly studied water bodies in Estonia and a rather extensive set of data has been gathered during the last 50 years. The limnological time-series data indicate that the L. Pskov ecosystem is under threat of eutrophication, which has led to an undesirable growth of algae, massive blooms of cyanobacteria accompanied by fish kills, low water transparency and silting of the lake bottom (Laugaste et al, 2001;Kangur et al, 2003;2005). Previous assessments have shown that most of the nutrients are carried into L. Pskov via the Velikaya River (Stå lnacke et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Combining limnological and palaeolimnological approaches in assessing degradation of Lake Pskov

Kangur

Laugaste

et al. 2007

Hydrobiologia

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Limnological monitoring data and palaeorecords from large shallow Lake Pskov were used to study the long-term dynamic pattern of the lake ecosystem and to identify the start of its degradation. Lake Pskov is the southern part of Lake Peipsi s.l., the largest transboundary lake in Europe. The limnological monitoring data collected in the years show that the water quality of L. Pskov has deteriorated and caused adverse changes in the whole ecosystem (e.g. excessive growth of algae, increased cyanobacterial blooms, silting of the lake bottom, fish kills). Doubled total phosphorus (P tot ), dissolved inorganic P (PO4-P) and chlorophyll a (Chl-a) contents, increased total alkalinity (HCO 3 -) and pH, as well as decline in water transparency and oxygenation conditions, indicate a clear increase in the trophic level of the lake. However, the limnological studies do not show when the degradation started. To understand long-term dynamics of the lake ecosystem, a 52 cm sediment core taken from one monitoring station of L. Pskov was studied and dated by the 210 Pb method. Palaeodata show that substantial changes in the L. Pskov ecosystem started already in the 1930s when mesotrophic conditions in the lake turned increasingly eutrophic. Since that time, the content of P, nitrogen (N), carbon (C) and relative abundance (RA%) of planktonic diatoms in the sediment have increased significantly (P < 0.005-0.030). Comparison of water variables with the sediment variables in five to eight time points, coinciding in palaeorecords and monitoring data, reveals several significant correlations. Strong and highly significant Spearman correlations (r > 0.9 or r < -0.9, P < 0.001) were observed between the contents of P, N, C and sulphur (S) in the sediment and the mean water level (WL) and temperature (WT) registered one to five years earlier in the lake. The C content of the sediment showed a negative relationship with WL and a positive correlation with WT. A significant positive relationship was recorded also between WT, and N and P content in the sediment. It is hypothesized that a higher WT and lower WL result in an increased organic mater accumulation in the sediment in the coming years.

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Phytoplankton response to changed nutrient level in Lake Peipsi (Estonia) in 1992–2001

Cited by 39 publications

References 10 publications

Study of phytopigments in river bed sediments: effects of the organic matter, nutrients and metal composition

Study of phytopigments in river bed sediments: effects of the organic matter, nutrients and metal composition

Weather conditions influencing phosphorus concentration in the growing period in the large shallow Lake Peipsi (Estonia/Russia)

Combining limnological and palaeolimnological approaches in assessing degradation of Lake Pskov

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