Lake Kutubu

Lake Kutubu is a lake in the Southern Highlands Province of Papua New Guinea. It lies to the east of the Kikori River, into which it eventually drains. It is about 50 km southwest of Mendi, the provincial capital. It is one of the few lakes in the country that occurs in a depression in the rugged interior mountains.[2] It is the second-largest lake in Papua New Guinea,[3] after Lake Murray, and, at 800 m above sea level,[3] the largest upland lake.[4] The area of the lake is 49.24 km²,[3] while the total catchment area is 250 km².[4] Lake Kutubu and Lake Sentani form an ecoregion on the WWF's Global 200.[5]

Lake Kutubu
LocationNipa-Kutubu District,
Southern Highlands Province
Coordinates6°24′S 143°20′E
Primary inflowsunderground sources, several streams, largest is Hamua Creek
Primary outflowsSoro River
Catchment area250 km2 (97 sq mi)
Basin countriesPapua New Guinea
Max. length19 km (12 mi)
Max. width4.5 km (2.8 mi)
Surface area49.24 km2 (19.01 sq mi)
Max. depth70 m (230 ft)
Surface elevation808 m (2,651 ft)
Designated25 September 1998
Reference no.961[1]

The lake has a few islands, the largest of which is Wasemi Island in its northern part. The water of Lake Kutubu is clear, and the lake reaches a depth of 70 m (230 feet). It is fed by several streams, most of its contents come from underground sources.[5] The catchment is inhabited by two main ethnic groups, the Foe to the south and the Fasu to the north. Thirty-three villages lie in the catchment area, with a total estimated population of 10,885.[4]

The lake gave its name to the nearby Kutubu Oil Project, Papua New Guinea's first commercial oilfield development, operated by Oil Search Limited, and which began production in 1992.[6] The development has supported the local economy, and caused a general in-migration to the area, and ecological problems resulting from rapid population growth, including pollution, forest destruction and overfishing. A proposed gas pipeline and road are expected to exacerbate these problems unless they are well-managed.[4]

Fauna

Lake Kutubu includes 13 endemic fish species, making it the most unusual lacustrine habitat for fishes in the New Guinea-Australia region.[4] The endemic fish species are:[7][8]

  • Kutubu tandan (Oloplotosus torobo)
  • Lake Kutubu rainbowfish (Melanotaenia lacustris)
  • Kutubu hardyhead (Craterocephalus lacustris)
  • Adamson's grunter (Hephaestus adamsoni)
  • Black mogurnda (Mogurnda furva)
  • Lake Kutubu mogurnda (Mogurnda kutubuensis)
  • Mogurnda maccuneae
  • Mogurnda mosa
  • Blotched mogurnda (Mogurnda spilota)
  • Variegated mogurnda (Mogurnda variegata)
  • Striped mogurnda (Mogurnda vitta)
  • Two undescribed species of Glossogobius (tentatively known as "new sp. 8" and "new sp. 12")[8]

Additionally, the Parastacid crayfish Cherax papuanus is endemic to the lake.[9]

Conservation

Because of its biodiversity and ecological significance, the area has been designated a "Wetland of International Significance" by the Ramsar Convention.[3] The area included in this designation matches the Lake Kutubu Wildlife Management Area[3] (240.57 km²).[10] The area is undergoing study by the World Wildlife Fund and the drafting of a catchment management plan has commenced, which is anticipated to become a model for other catchments in Papua New Guinea.[11] The project is to be completed by December 2007.[12] The Lake Kutubu area is also included in the tentatively listed Kikori River Basin - Great Papuan Plateau World Heritage Site.[10]

Languages

Kutubuan and other Trans-New Guinea languages are spoken in the region.

See also

Notes
  1. "Lake Kutubu". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. Brian Essai. Papua and New Guinea: A Contemporary Survey. Melbourne: Oxford University Press, 1961. Page 21.
  3. Lake Kutubu at Ramsar site
  4. Pilot and Demonstration Activities: Integrated Catchment Management in Lake Kutubu, Papua New Guinea at Asian Development Bank website
  5. Lakes Kutubu and Sentani at WWF
  6. Kutubu Archived 2007-03-16 at the Wayback Machine on Oil Search Limited website
  7. List taken from Lakes Kutubu and Sentani - A Global Ecoregion from the WWF, although it reports a figure of 11 species.
  8. Polhemus, D.A., R.A. Englund, and G.R. Allen (2004). Freshwater Biotas of New Guinea and Nearby Islands: Analysis of Endemism. Bernice Pauahi Bishop Museum, Conservation International
  9. Austin, C.M. (2010). "Cherax papuanus". IUCN Red List of Threatened Species. 2010: e.T153660A4528294. doi:10.2305/IUCN.UK.2010-3.RLTS.T153660A4528294.en.
  10. Kikori River Basin - Great Papuan Plateau at World Heritage Sites tentative lists
  11. Lake Kutubu Catchment Management Plan: Project Inception Report Archived 2007-06-24 at the Wayback Machine, page 3.
  12. Lake Kutubu Catchment Management Plan: Project Inception Report Archived 2007-06-24 at the Wayback Machine, page 5
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