Uroglena quest after dark on Lake Lunz

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Uroglena

Lake Lunz has been experiencing several changes in the last years. One of them is the summer dominance of the chrysophyte Uroglena cf. americana.

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Although this algae has always been part of the flora of the lake, its long-lasting dominance during summer is a recent phenomenon. And a quite conspicuous one as the colonies are visible even with bare eye, increasing turbidity in the water. Besides, the lake literally smells fishy during these blooms…

We are at the moment unaware of its effects on the zooplankton community. As part of Csaba’s ChrysoWeb project, we investigate, whether Uroglena exhibits diurnal migration patterns in the lake and how its distribution affects zooplankton.

For this, we take samples both day…

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… and night.

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