Orlången

Coordinates: 59°11′48″N 18°02′28″E / 59.19667°N 18.04111°E / 59.19667; 18.04111
Source: Wikipedia, the free encyclopedia.
Orlången
Huddinge
References[1][2]
1 Shore length is not a well-defined measure.

Orlången is a lake in central Huddinge Municipality, just south of Stockholm, Sweden.

Orlången, one of the lakes in the

Tyresån Lake System, forms part of the Orlången Nature Reserve.[3]

Catchment area

Meandering waters at the wetland purifying facility north of the lake.

The catchment area is composed of criss-crossing fractured valleys with alternating agricultural lands and forests. The lake and its shores are highly popular for open-air activities such as fishing, bathing, birdwatching, tour skating, canoeing, skiing, and walking. The Bottnen ("The Bottom") wetland near the inflow from Mörtsjön is an important bird locale. There are several public baths by the lake, but its many cliffs are also popular spots to spend a summer day. Approximately half of the lake is available for angling for people with the required angling card.[3]

Environmental impact

Though the mud-filled valleys surrounding Orlången originally made it moderately eutrophic, extended accumulation of nutrients from neighbouring populated areas has made it highly eutrophic. The deepest areas of the lake are depleted of oxygen during both winters and summers, which can indicate that internal loads are worsening the situation; the lake is possibly self-fertilising, as nutrients are released from its sediments. The present discharge of phosphorus, mostly deriving from three residential areas by the lake, is still too high although it remains controllable.[3]

Flora and fauna

Aquatic plants includes

marsh cinquefoil, marsh-marigold, bittersweet, skullcap, corn mint, meadowsweet, trifid bur-marigold, and purple small-reed.[3]

An inventory of

four-spotted chaser.[3]

Fishes present in the lake include

carp bream, crucian carp, burbot, perch, zander, and ruffe. Signal crayfish were introduced in the 1970s.[3]

Common birds include

reed warbler, sedge warbler, marsh warbler, and thrush nightingale. Additionally, a couple of cranes has been breeding by the lake for about ten years.[3]

The deciduous forest north of the lake and the shallow reeds there is an important biotope for bats, as the area produces a plenitude of insects while offering favourable milieux for hibernation. Inventories during the 1990s have documented a presence of northern bat, parti-coloured bat, Daubenton's bat, noctule, soprano pipistrelle, brown long-eared bat, and whiskered bat.[3]

  • Orlången in the winter.
    Orlången in the winter.
  • Orlången.
    Orlången.
  • Sundby estate, 2012.
    Sundby estate, 2012.

See also

Notes

  1. ^ a b c Södertörnsekologerna
  2. ^ Huddinge Municipality, Orlången, PDF
  3. ^ a b c d e f g h Huddinge Municipality, Orlången, site

References

  • "Vattenväxter i sjöarna på Södertörn och i angränsande områden samt uppbyggnad av en sjödatabas" (PDF) (in Swedish). Södertörnsekologerna. pp. Appendix 7, p 5. Archived from the original (PDF) on 2007-10-07. Retrieved 2008-02-23.
  • "Orlången" (PDF) (in Swedish). Huddinge Municipality. Retrieved 2008-02-23. (Fact sheet and bathymetric map)
  • "Orlången" (in Swedish). Huddinge Municipality. Retrieved 2008-02-23.
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