Uet era Ngermeuangel

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Uet era Ngermeuangel
Big Jellyfish Lake
Ngermeuangel Lake
Palau location map.svg
Red pog.svg
Uet era Ngermeuangel
Big Jellyfish Lake
Ngermeuangel Lake
Location Koror, Palau
Coordinates 7°19′25″N134°30′31″E / 7.32361°N 134.50861°E / 7.32361; 134.50861 Coordinates: 7°19′25″N134°30′31″E / 7.32361°N 134.50861°E / 7.32361; 134.50861
Lake type Meromictic
Basin  countriesPalau
Max. length290 m (1,000 ft)
Surface area 4.3  ha (11 acres)
Max. depth40 m (100 ft)
Frozennever
Islands none
Settlementsnone

Uet era Ngermeuangel (Ngermeuangel Lake, Big Jellyfish Lake) is a marine lake located on Koror island in Palau. There are about 70 other marine lakes located throughout the Rock Islands and Koror. Uet era Ngermeuangel is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Clear Lake (Palau), Goby Lake, Uet era Ongael.

Contents

Golden jellyfish

Uet era Ngermeuangel is connected to the ocean through fissures and tunnels in the limestone of ancient Miocene reef. However the lake is sufficiently isolated and the conditions are different enough that the diversity of species in the lake is greatly reduced from the nearby lagoon. The golden jellyfish Mastigias cf. papua remeliiki [1] and possibly other species in the lake have evolved to be substantially different from their close relatives living in the nearby lagoons. In the lake there is living also jellyfish Aurelia sp.

Lake stratification

Uet era Ngermeuangel is a deep, comparatively ancient (12,000–15,000 years old) lake, stratified into two layers, an oxygenated upper layer (mixolimnion) and a lower anoxic layer (monimolimnion). The oxygen concentration in the lake declines from about 6 mg/l at the surface to zero at 18 meters (at the chemocline). [2] Stratification is persistent and seasonal mixing does not occur. The lake is one of about 200 saline meromictic lakes that have been identified in the world. Most of these lakes are of freshwater origin. Permanently stratified marine lakes are unusual, but in Palau there are eleven other such lakes. [3] The most renowned one is Jellyfish Lake.

Related Research Articles

Palau Country in the western Pacific

Palau, officially the Republic of Palau and historically Belau, Palaos or Pelew, is an island country in the western Pacific. The nation has approximately 340 islands and connects the western chain of the Caroline Islands with parts of the Federated States of Micronesia. It has a total area of 466 square kilometers. The most populous island is Koror. The capital Ngerulmud is located on the nearby island of Babeldaob, in Melekeok State. Palau shares maritime boundaries with international waters to the north, Micronesia to the east, Indonesia to the south, and the Philippines to the north west.

Geography of Palau

The Republic of Palau consists of eight principal islands and more than 250 smaller ones lying roughly 500 miles southeast of the Philippines, in Oceania. The islands of Palau constitute the westernmost part of the Caroline Islands chain. The country includes the World War II battleground of Peleliu and world-famous rock islands. The total land area is 459 km2 (177 sq mi). It has the 42nd largest Exclusive Economic Zone of 603,978 km2 (233,197 sq mi).

Koror State in Palau

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Peleliu State in Palau

Peleliu is an island in the island nation of Palau. Peleliu, along with two small islands to its northeast, forms one of the sixteen states of Palau. The island is notable as the location of the Battle of Peleliu in World War II.

Angaur State in Palau

Angaur or Ngeaur is an island and state in the island nation of Palau.

Rock Islands Collection of reef islands in Palau

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Kayangel State in Palau

Kayangel (Ngcheangel) is the northernmost state of Palau 24 km (15 mi) north of Koror. The land area is about 1.4 km2 (0.54 sq mi). The population is 54.

Hatohobei State in Palau

Tobi, or Hatohobei (Tobian), is the southernmost of Palau's sixteen states, consisting of Tobi Island and Helen Reef. The total land area is about 0.88 km². The population was 25 in 2015. Tobian, English, and Sonsorolese are the official languages of Hatohobei State.

Jellyfish Lake

Jellyfish Lake is a marine lake located on Eil Malk island in Palau. Eil Malk is part of the Rock Islands, a group of small, rocky, mostly uninhabited islands in Palau's Southern Lagoon, between Koror and Peleliu. There are about 70 other marine lakes located throughout the Rock Islands. Millions of golden jellyfish migrate horizontally across the lake daily.

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Spotted jelly Species of jellyfish

The spotted jelly, lagoon jelly, golden medusa, or Papuan jellyfish, is a species of jellyfish from the Indo-Pacific oceans. Like corals, sea anemones, and other sea jellies, it belongs to the phylum Cnidaria. Mastigias papua is one of the numerous marine animals living in symbiosis with zooxanthellae, a photosynthetic alga.

<i>Mastigias</i> Genus of jellyfishes

Mastigias is a genus of true jellyfish in the family Mastigiidae. It contains seven described species. Members of this genus are found widely in coastal regions of the Indo-Pacific, including saline lakes of Palau, but there are also records from the West Atlantic at Florida and Puerto Rico. The West Atlantic records are most likely the result of accidental introductions by humans.

Hawksbill sea turtle Species of reptile

The hawksbill sea turtle is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus Eretmochelys. The species has a worldwide distribution, with Atlantic and Indo-Pacific subspecies—E. i. imbricata and E. i. bissa, respectively.

Clear Lake (Palau)

Clear Lake is a marine lake located on Eil Malk island in Palau. Eil Malk is part of the Rock Islands, a group of small, rocky, mostly uninhabited islands in Palau's Southern Lagoon, between Koror and Peleliu. There are about 70 other marine lakes located throughout the Rock Islands. Clear Lake is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Goby Lake, Uet era Ngermeuangel, Uet era Ongael.

Goby Lake

Goby Lake is a marine lake located on Koror island in Palau. There are about 70 other marine lakes located throughout the Rock Islands and Koror. Goby Lake is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Clear Lake (Palau), Uet era Ngermeuangel, Uet era Ongael.

Uet era Ongael

Uet era Ongael is a marine lake located on Ongael Island, Koror, in Palau. There are about 70 other marine lakes located throughout the Rock Islands and Koror. Uet era Ongael is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology, the other lakes being Jellyfish Lake, Clear Lake, Uet era Ngermeuangel and Goby Lake.

Ongael Island is an island in Koror State, Palau. It is the location of the famous Ongael Lake.

References

  1. Dawson M, Michael. "Five new subspecies of Mastigias (Scyphozoa: Rhizostomeae: Mastiigidae) from marine lakes, Palau, Micronesia" (PDF). Archived from the original on September 5, 2006. Retrieved 2010-02-11.
  2. "Coral Reef Research Foundation" . Retrieved 2010-02-11.
  3. Stratified marine lakes of Palau (Western Caroline Islands) Physical Geography 19: 175-220, William Hamner, Peggy Hamner