Nutrient Fluxes and Their Impact on the Phytoplankton in a Shallow Coastal Lake

Abstract

Nutrient status, mainly the availability of nitrogen and phosphorus, is essential to understand the present state of a lake ecosystem and to predict its possible further development and proper management strategies within the drainage basin [1]. Because each lake ecosystem is influenced by lake morphometry, basin geology, and climate, nutrient sources and nutrient cycling in lake waters differ between lakes [2]. Numerous case studies are needed to formulate more general patterns of lake ecosystem functioning in relation to their specific characteristics. Lake Gardno belongs to a type of shallow lake located along the southern Baltic Sea coast and influenced by seawater intrusions. Such coastal lakes were grouped separately within the Polish abiotic typology prepared according to the requirements of the Water Framework Directive 2000/60/EC [3]. It represents the type of lake which can be considered a "shallow" lake. Shallow lakes differ in their hydraulic behavior and ecological functioning from deep lakes.

Growth rates of common pelagic ciliates in a highly eutrophic lake measured with a modified dilution method

“…were observed (Table 1). Such changes are typical for Lake Gardno, because bottom sediments are frequently resuspended due to its shallow depth and wind-induced mixing (Wielgat-Rychert et al 2015).…”

“…e studies were performed in large (24.7 km 2 ), shallow (mean depth: 1.2 m), brackish (mean salinity: 0.6-0.7 PSU, Trojanowski & Antonowicz 2011, Rychert et al 2012, Wielgat-Rychert et al 2015) Lake Gardno (54°39'N, 17°07'E), at an o shore station in the southern part of the lake representing an open water area (Ficek & Wielgat-Rychert 2009). e lake is highly eutrophic with high average chlorophyll concentrations in the growing season (87 µg l -1 ) and high annual integrals of primary production at 402-471 g C m -2 (Wielgat- Rychert et al 2010).…”

“…was sensitive to the experimental procedure. Studies were performed in the highly eutrophic and brackish lake with unstable environmental conditions (Wielgat-Rychert et al 2015).…”

Significance of pelagic and benthic metabolism for the carbon budget of a shallow lake

“…Photosynthetically active radiation (PAR) measurements were obtained from the Meteorological Station at the Pomeranian Academy in Słupsk, about 30 km from Lake Gardno. The underwater light fields (Table 1) were measured with a Satatlantic spectroradiometer (Wielgat- Rychert et al, 2015).…”

Detection of Autumnal Concentration of Coscinodiscus granii in the Southern Baltic—A Method for In Situ Measurement of Marine Particles

“…The major groups of phytoplankton in the Baltic Sea are diatoms, dinoflagellates and cyanobacteria, together with the common ciliate species Mesodinium rubrum, all with different functions in the system. The seasonal succession mechanisms of phytoplankton have been quite well identified in both fresh and sea waters [1][2][3][4][5][6]. Every year, regular cyclic changes in the biomass and taxonomic composition of phytoplankton assemblages are recorded in Baltic Sea waters.…”