The plankton of coastal lagoons while they are covered by ice is rarely studied. We hypothesised that, under ice: (1) the lack of wind mixing would lead to strong diversification in the spatial distribution of both phyto- and zooplankton communities across the lagoon; and (2) top-down regulation would be small, and would not significantly affect the development of phytoplankton. We tested these hypotheses in Vistula Lagoon (southern Baltic Sea) a few weeks after the thickness of the ice had reached 10cm. Considerable horizontal and vertical spatial variation in some physical (turbidity, transparency) and chemical (Cl–, total N and total P) water properties were observed. According to a two-dimensional canonical correspondence analysis, these differences were related to the heterogeneous distribution of several plant and animal taxa, supporting our first hypothesis. The ratio of the total biomass of non-predatory zooplankton (BZp) to the biomass of edible phytoplankton ≤35µm (BPh) was low across the different sampling sites (mean 0.08; range 0.02–017), and differed across the lagoon. However, the significant correlation between BZp and BPh values (Spearman test, r=0.70; P≤0.05) suggests a considerable role of zooplankton filter feeders in controlling the development of phytoplankton. Therefore, top-down control may be quite strong, refuting Hypothesis 2.
Patchy distribution of phyto- and zooplankton in large and shallow lagoon under ice cover and resulting trophic interactions
R. Kornijów,M. Karpowicz,J. Ejsmont-Karabin,L. Nawrocka,E. de Eyto,K. Grzonkowski,A. Magnuszewski,A. Jakubowska,T. Wodzinowski,A. Woźniczka
Published 2020 in Marine and Freshwater Research
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- Publication year
2020
- Venue
Marine and Freshwater Research
- Publication date
2020-03-04
- Fields of study
Environmental Science
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