Tag Archives: Großesr Bullensee

The twin lakes of the Lower Saxony in Germany (Die Bullenseen)

The twin lakes (Großer and Kleiner Bullenseen) are situated in the Wümme depression that was covered by ice during the Ice Age. As the ice retired, the two depressions filled with water remaind and today they are replenished by the Wümme´s branches. The small lake is since 1938 part of the nature reserve “The big and the white moor” (“Großes und Weißes Moor”).

Since the water of the big lake (Fig. 1) is surrounded by a bog, it is rich in humic substances, therefore very acid  (pH 4.5-5) and not suitable for fish. However many other animals can thrive in such conditions – so here we can find various water bird species, snakes, like the grass snake Natrix natrix, frogs (Fig. 2), dragonflies and even bats in the evenings.

Fig. 1 The big lake (Großer Bullensee)
Fig. 2 A frog captured at the border of the big lake

Typical plant species found near the shore are the bulrush or Typha latifolia, the water-dropwort (genus Oenanthe), Fig. 3a,  the bog arum or Calla palustris, Fig. 3b and the carnivorous plant Drosera anglica.

Fig. 3a The bulrush and the water-dropworth; Fig. 3b The bog arum.

The small lake (Fig. 4a and b) is accessible by a trail with informative panels made by the Nabu association. It is positioned north of the big lake, surrounded by a pine forest and blueberry bushes which densely grow at the forest floor (FIg. 5a and b).

This slideshow requires JavaScript.

The lake can be observed only by a certain distance since this environment is very vulnerable and the soil is muddy and soft, so it can easily trap you.

Various water bird species can be found, the most common are the tufted duck Aythyla fuligula, the mallard Anas platyrhynchos and the Eurasian teal Anas crecca.

Photos by Ingrid Ugussi Vukman