Amount and variety of phytoplankton species in Lake

Aim To analyze nutrition status of Lake Limmaren by analyzing the phytoplankton living in

Hypotheses • The biggest amount of phytoplankton should be found in Lake Limmaren, medium

Method • Samples were taken from Lake Limmaren. • Tube collector was used to

Materials • Tube collector with deep graduated line and sinker • Lugol • Sample

Results Table 1. Groups and amount of phytoplankton individuals in the sample of Lake

Table 2. Phytoplankton species in Lake Limmaren, that indicate eutrophication on a scale from

Table 3. Sechi depth in lakes Erken, Largen and Limmaren. Lake Depth (metres) Erken

Table 4. The amount of phytoplankton individuals in lakes Erken, Largen and Limmaren. Lake

Conclusion Seventeen different species of phytoplankton have been found. Four of them indicate the

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Amount and variety of phytoplankton species in Lake Limmaren 2011 Authors: Maija Ķīkule, Latvia Greta Kaklytė, Lithuania Supervisor: Pia Larsson, Sweden

Aim To analyze nutrition status of Lake Limmaren by analyzing the phytoplankton living in the lake. To compare the lakes by combining results with the data gathered from lakes Erken and Largen by the other groups.

Hypotheses • The biggest amount of phytoplankton should be found in Lake Limmaren, medium in Lake Erken and the smallest in Lake Largen. • Cyanophyseae is expected in Lake Limmaren if p. H is high.

Method • Samples were taken from Lake Limmaren. • Tube collector was used to collect them from the epilimnion layer. • Using measurements of Lake’s Limmaren volume samples are mixed. • Lugol was added to the water in beakers. • Sedimentation chamber of 2 ml volume and inverted microscope were used to count the amount of phytoplankton and to identify them.

Materials • Tube collector with deep graduated line and sinker • Lugol • Sample bottles made of glass • Bucket for stirring sample • Funnel • Labels for indicating the lake, or other identifier, test level, date. • Sample bottle made of glass or plastic 25 -100 ml

Results Table 1. Groups and amount of phytoplankton individuals in the sample of Lake Limmaren. Group of algae Amount/0, 5 ml Diatomeae 219 Chlorophyceae 88 Cyanophyceae 21166

Diatomeae Cyanophyceae

Chlorophyceae Chrysophyceae

Table 2. Phytoplankton species in Lake Limmaren, that indicate eutrophication on a scale from 1 -3. Species Indicator number Anabaena Microcistys Pediastrum Stephanodiscus 2 3 3 2 % in the sample 0, 24 93, 06 0, 07 0, 01 Total: 93, 38

Table 3. Sechi depth in lakes Erken, Largen and Limmaren. Lake Depth (metres) Erken 5, 25 Largen 5, 77 Limmaren 1, 12

Table 4. The amount of phytoplankton individuals in lakes Erken, Largen and Limmaren. Lake Amount of phytoplankton /ml Erken 1170 Largen 11746 Limmaren 95652

Conclusion Seventeen different species of phytoplankton have been found. Four of them indicate the eutrophication and creates 93, 38% of all species found in the sample. In Lake Limmaren the biggest amount of phytoplankton individuals have been found. Lake Limmaren has the highest nutrient status and is a eutrophic lake; Lake Erken has medium nutrient status and is a mesotrophic lake; Lake Largen has lowest nutrient status and is an oligotrophic lake.

Thank you four your attention!