Otterstedter See

Otterstedter See
Geographical location	Ottersberg municipality , Verden district , Lower Saxony
Drain	Aalgraben to Dauensiekgraben
Places on the shore	Otterstedt
	Data
Coordinates	53 ° 8 '2 " N , 9 ° 9' 33" E Coordinates: 53 ° 8 '2 " N , 9 ° 9' 33" E
Altitude above sea level	20 m
surface	4.5 ha
Maximum depth	11 m

The Otterstädter See - also called Pastorensee - is a lake in the village of Otterstedt in the municipality of Ottersberg , Verden district , Lower Saxony .

description

The lake is located southeast of Otterstedt in a depression surrounded by a flat wall and is said to have been created around 12,000 years ago, according to legend, by a sinkhole . However, science assumes post-glacial formation. The lake is believed to be the remains of a collapsed pingo .

In a weekend home areas this lake belongs since 1984 the stains Ottersberg. Before that it was privately owned.

Before the weekend houses by the lake were connected to a sewer system in 1975 , the sewage ended up in the lake, which led to a strong enrichment of nutrients. Furthermore, u. a. through agriculture and the trees surrounding the lake, nutrients into the lake. A ring trench around the lake is intended to minimize the entry of polluted surface water. Due to the nutrient input, algae carpets repeatedly appear in the polytrophic lake. In the early summer of 2002 there was a massive occurrence of blue-green algae , so that the lake had to be rehabilitated. For this purpose, a phosphate binder was introduced into the lake in 2006 , but it only inhibited algae growth for a few years.

There are three beach areas on the eastern shore of the lake that are guarded by the German Life Saving Society in summer . The DLRG also uses the lake for training purposes.

The lake has an outflow to the north to the Dauensiekgraben, the water of which flows into the Wümme north arm via Otterstedter Beeke and Walle west of Ottersberg . It is fed by groundwater.

Flora and vegetation

The lake is surrounded by a narrow reed belt, which is interrupted in several places by jetties and bathing areas. The reed ( Phragmites australis ) dominates in it. In some places the yellow iris ( Iris pseudacorus ) and the large swath ( Glyceria maxima ) also grow . On the west bank there are large populations of floating leaves with the yellow pond rose ( Nuphar lutea ) and the white water lily ( Nymphaea alba ). In the past, some rare plants settled in the water, but today they have completely disappeared due to increasing eutrophication and intensive recreational use, including beach lobster ( Litorella uniflora ), narrow-leaved hedgehog ( Sparganium affine ), sea bream ( Isoetes lacutris ) and narrow-leaved cottongrass ( Eriophorum ) ). The latter species suggest that the water used to be much poorer in nutrients than it is today.

Scientific investigations

For many decades, science has been interested in clarifying the history of the lake. As early as 1938 Lundbeck recognized a connection with the ice age landscape history. In Otterstedter See, he sees typical geomorphological features for a whirlpool , such as the asymmetrical, funnel-like shape of the lake. Garleff (1968), on the other hand, suspected that the lake was the result of a cryogenic cave , i.e. a hollow shape that was created by ice accumulation in the permafrost soil .

Pollen analysis studies by Müller (1970) show that the lake was formed at the end of the last ice age. Interestingly, the lake has not increasingly silted up since then, on the contrary, it deepened increasingly over the course of the Holocene . This concluded Müller, the lake was a Weichselian , Late Glacial Quelleishügel ( Pingo originated). The depression therefore reflects the progressive collapse of the pingo.

legend

According to a legend , the lake was created when the devil who lived in the nearby Düvelshoop forest (today: Kreuzbuchen) wanted to destroy the church in Otterstedt. To do this, he threw a giant stone against the church tower, whereupon the earth trembled and tore. As a result, water gushed out of the ground and swallowed up the church and the surrounding trees. The name "Pastorensee" is said to go back to a previous owner of the lake, who lived in the 17th and 18th centuries and was pastor of Otterstedt.

In another version of the story, the church was attacked and ravaged by a group of unbelievers during the Christmas Eve service . As the church molesters left the church, a storm broke out and the earth shook, causing the church to sink. The lake is now where the church once stood.

Web links

Commons : Otterstedter See - Collection of images, videos and audio files

Otterstädter See , Bathing Water Atlas Lower Saxony
Flyer to the Otterstedter See

Individual evidence

↑ ^a ^b Blue-green algae in Lake Otterstedter ( Memento from July 14, 2014 in the Internet Archive ). Initiative Save the Ottersberger See.
↑ Uwe Dammann: Protection zone for the Otterstedter See . In: Weser courier . July 26, 2012. Retrieved September 3, 2012.
↑ ^a ^b The Otterstedter See, the Düvelshoop and the witch circles near Eckstever , databases on European ethnology / folklore, traditional legends. Retrieved September 3, 2012.
↑ ^a ^b H. Müller: Ecological changes in the Otterstedter See during the post-ice age. In: Reports of the Natural History Society Hanover , Report 114, 1970, pp. 33–47.
↑ ^a ^b ^c ^d The battlements of a church shine . In: Rotenburger Rundschau. August 5, 2001. Retrieved September 3, 2012.
↑ Uwe Dammann: Blue-green algae are multiplying again . In: Weser courier. January 15, 2011. Retrieved September 3, 2012.
↑ Otterstedter See . German Life Saving Society, local group Ottersted e. V. Accessed April 8, 2016.
^ Franz Buchenau: Flora of Bremen, Oldenburg, East Frisia and the East Frisian Islands. 10th edition, Bremen 1936.
↑ Lundbeck, J. (1938): The becoming and decay of the northwest German lakes. In: Geol. Meere u. Inland Waters 2 , pp. 22-61.
↑ Garleff, K. (1968): Geomorphological investigations on closed hollow forms ("caves") of the Lower Saxony lowlands. In: Göttinger geographical treatises 44 , p. 142.
↑ The legend of the Otterstedter See . Retrieved April 8, 2016.

[Initiative-1] Blue-green algae in Lake Otterstedter ( Memento from July 14, 2014 in the Internet Archive ). Initiative Save the Ottersberger See.

[2] Uwe Dammann: Protection zone for the Otterstedter See . In: Weser courier . July 26, 2012. Retrieved September 3, 2012.

[Sagen-3] The Otterstedter See, the Düvelshoop and the witch circles near Eckstever , databases on European ethnology / folklore, traditional legends. Retrieved September 3, 2012.

[mueller_1970-4] H. Müller: Ecological changes in the Otterstedter See during the post-ice age. In: Reports of the Natural History Society Hanover , Report 114, 1970, pp. 33–47.

[RR-5] The battlements of a church shine . In: Rotenburger Rundschau. August 5, 2001. Retrieved September 3, 2012.

[6] Uwe Dammann: Blue-green algae are multiplying again . In: Weser courier. January 15, 2011. Retrieved September 3, 2012.

[7] Otterstedter See . German Life Saving Society, local group Ottersted e. V. Accessed April 8, 2016.

[8] Franz Buchenau: Flora of Bremen, Oldenburg, East Frisia and the East Frisian Islands. 10th edition, Bremen 1936.

[9] Lundbeck, J. (1938): The becoming and decay of the northwest German lakes. In: Geol. Meere u. Inland Waters 2 , pp. 22-61.

[10] Garleff, K. (1968): Geomorphological investigations on closed hollow forms ("caves") of the Lower Saxony lowlands. In: Göttinger geographical treatises 44 , p. 142.

[11] The legend of the Otterstedter See . Retrieved April 8, 2016.