Luzon montane rain forests

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Luzon montane rain forests
Mature forest in the crater floor of Mt. Cagua - ZooKeys-266-001-g014.jpg
Mature forest in the crater floor of Mount Cagua
Ecoregion IM0122.png
Ecoregion territory (in purple)
Ecology
Realm Indomalayan
Biome tropical and subtropical moist broadleaf forests
Borders Luzon rain forests and Luzon tropical pine forests
Geography
Area8,273 km2 (3,194 sq mi)
Country Philippines
Conservation
Conservation status Critical/endangered
Protected3,813 km² (46%) [1]

The Luzon montane rain forests is a tropical moist broadleaf forest ecoregion on the island of Luzon in the Philippines. The ecoregion is located on several volcanic and non-volcanic mountains of the island. Luzon is the largest and northernmost major island of the Philippines, located in the western Pacific Ocean. [2]

Contents

Satellite view of the island Luzon Northern Philippines (Luzon).jpg
Satellite view of the island Luzon

Geography

The ecoregion includes several volcanic and non-volcanic mountains that exceed 1,000 metres (3,300 ft) in altitude. [2] The volcanic mountains include Mt. Makiling, Mt. Banahaw, Mt. Isarog, Mayon Volcano, and Bulusan Volcano. [2] Also within the ecoregion are the Northern and Southern Sierra Madre, Mt. Sapacoy, Mt. Magnas, and Mt. Agnamala in the northern Cordillera Central highlands and the Zambales Mountains in the west. [3]

The Sierra Madre mountain range. Ultrabasic forests above 1200 m at Barangay Diddadungan - ZooKeys-266-001-g006.jpg
The Sierra Madre mountain range.

Luzon has never been connected to mainland Asia. Even when glacial advances during the Pleistocene caused sea levels to fall over 100 meters worldwide, this only connected Luzon to the modern islands of Polillo, Marinduque, and Catanduanes. At least 15 million years ago, friction between the Australian and Asian tectonic plates and volcanic activity created parts of the Luzon highlands, which over the next 10 million years morphed into their modern form. [2] This long period of isolation and complex internal geography is a primary cause for the great biodiversity and high degree of endemism found on the island of Luzon. [4]

Climate

In some areas, annual rainfall can be about quadruple what the lowland rainforests receive (as high as 10,000 mm). [3] The Sierra Madres have very mild seasons, with a slight dry period between December and April. The Zambales Mountains and northern Central Cordillera highlands are more strongly seasonal with a longer dry period and slightly less rainfall generally. [3]

Batong Buhay jeep on its 5-hour once a day journey through the Cordillera Central to Tabuk, the capital of Kalinga province. BatongBuhay1872.jpg
Batong Buhay jeep on its 5-hour once a day journey through the Cordillera Central to Tabuk, the capital of Kalinga province.

Flora

The dipterocarp trees of the lowlands are gradually replaced by oak and laurel forest species with increasing altitude. [3] The forests generally have less undergrowth and become shorter in stature as altitude increases. [3] With the decreasing temperature from increasing altitude, decomposition is slowed and results in a forest floor thick with humus. [3]

In the montane forests, epiphytes, vines, and moss-covered branches are very common. [3] The highest altitudes of montane forests are caller upper montane forest, or elfin forest, and are more extreme: trees are shorter in stature, and tree branches are so thick with moss and organic material that they can sustain aerial plants that are not typically epiphytes. [3] Many endemic animal species reside in the thick, matty soil of the upper montane forests. [3]

In fact, species richness is greatest along the highest elevations of the montane rainforests of Luzon. [4] Areas with the greatest levels of endemism are reported to be the Cordillera Central highlands, the Sierra Madre, the Zambales Mountains, and highlands on the Bicol Peninsula. [4]

Fauna

There are at least 31 endemic species of mammals on the island of Luzon. [5] Sixty-eight percent of all known native non-flying mammals are endemic to the area (23 of 34). [4]

The Philippine eagle Pithecophaga jefferyi.jpg
The Philippine eagle

The Philippine eagle (Pithecophaga jefferyi) is the second-largest eagle in the world found primarily in the Sierra Madre mountain range of Luzon. [5] [6] Primary lowland rainforests of the Philippines have been heavily deforested, and the Philippine eagle needs this area to breed, as well as nesting in large trees and hunting within the trees. [5] [6] The eagle is restricted to the islands of Luzon, Samar, Leyte, and Mindanao. [6] Attempts for captive breeding have been unsuccessful and it is estimated that less than 700 individuals remain. [5]

Often called Myer's snake in honor of Dr. George S. Myers, the genus Myersophis represented only by the species alpestris is a snake found only in the northern highlands of Luzon. [7]

Opening in jungle canopy at Mount Makiling Opening In Jungle Canopy, Mt Makiling - panoramio.jpg
Opening in jungle canopy at Mount Makiling

About sixty-eight percent of all native reptiles are endemic to the area (about 160 of 235). [5] The Philippine crocodile, Crocodylus mindorensis, is a freshwater crocodile that is considered the most threatened crocodile in the world and is endemic to the area; it is only found in Mindanao, Negros, and Luzon. [8] Wild populations in 1982 totaled somewhere between 500 and 1000 individuals. [5] In 1995, this number decreased to a mere 100 individuals. [5] The discovery of a population of this crocodile in the Northern Sierra Madre on Luzon gives hope for its conservation. [8] Active in the conservation of Crocodylus mindorensis is the Crocodile Rehabilitation Observance and Conservation (CROC) Project of the Mabuwaya Foundation. [5]

Conservation

A 2017 assessment found that 3,813 km2, or 46%, of the ecoregion is in protected areas. [1] Protected areas in the Luzon montane rain forests include: [9]

Related Research Articles

Geography of the Philippines Overview of the geography of the Philippines

The Philippines is an archipelago that comprises 7,641 islands with a total land area of 300,000 square kilometers (115,831 sq mi). It is the world's fifth largest island country. The eleven largest islands contain 95% of the total land area. The largest of these islands is Luzon at about 105,000 square kilometers (40,541 sq mi). The next largest island is Mindanao at about 95,000 square kilometers (36,680 sq mi). The archipelago is around 800 kilometers (500 mi) from the Asian mainland and is located between Taiwan and Borneo.

The Global 200 is the list of ecoregions identified by WWF, the global conservation organization, as priorities for conservation. According to WWF, an ecoregion is defined as a "relatively large unit of land or water containing a characteristic set of natural communities that share a large majority of their species dynamics, and environmental conditions". So, for example, based on their levels of endemism, Madagascar gets multiple listings, ancient Lake Baikal gets one, and the North American Great Lakes get none.

Cordillera Central (Luzon) Mountain range in Luzon, Philippines

The Cordillera Central or Cordillera Range is a massive mountain range 320 km long north-south and 118 km east-west. The Cordillera mountain range is situated in the north-central part of the island of Luzon, in the Philippines. The mountain range encompasses all provinces of the Cordillera Administrative Region, as well as portions of eastern Ilocos Norte, eastern Ilocos Sur, eastern La Union, northeastern Pangasinan, western Nueva Vizcaya, and western Cagayan.

The Philippine archipelago is one of the world's great reservoirs of biodiversity and endemism. The archipelago includes over 7000 islands, and a total land area of 300,780 km².

Sierra Madre del Sur Mountain range in southern Mexico

The Sierra Madre del Sur is a mountain range in southern Mexico, extending 1,000 kilometres (620 mi) from southern Michoacán east through Guerrero, to the Isthmus of Tehuantepec in eastern Oaxaca.

Sierra Madre Occidental pine–oak forests Temperate broadleaf and mixed forests ecoregion of Mexico and the United States

The Sierra Madre Occidental pine–oak forests are a Temperate broadleaf and mixed forests ecoregion of the Sierra Madre Occidental range from the southwest USA region to the western part of Mexico. They are home to a large number of endemic plants and important habitat for wildlife.

Philippine crocodile Species of crocodile

The Philippine crocodile, also known as the Mindoro crocodile, the Philippine freshwater crocodile, the bukarot in Ilocano, and more generally as a buwaya in most Filipino lowland cultures, is one of two species of crocodiles found in the Philippines; the other is the larger saltwater crocodile (Crocodylus porosus). The Philippine crocodile, the species endemic only to the country, went from data deficient to critically endangered in 2008 from exploitation and unsustainable fishing methods, such as dynamite fishing. Conservation methods are being taken by the Dutch/Filipino Mabuwaya foundation, the Crocodile Conservation Society and the Zoological Institute of HerpaWorld in Mindoro island. It is strictly prohibited to kill a crocodile in the country, and it is punishable by law.

The Cordillera ground warbler, also known as Rabor's wren-babbler or the Luzon wren-babbler, is a species of bird currently placed in the family Locustellidae. It is endemic to the Philippines found in the Northwest Luzon in the foothills of the Cordillera Mountain Range. Some taxonomists continue to list the species in the Timaliidae, others in the Pellorneidae.There are no known photographs of live Cordillera ground warblers in the wild.

White-browed jungle flycatcher Species of bird

The white-browed jungle flycatcher, also known as the Luzon jungle-flycatcher and the Rusty-flanked jungle-flycatcher, is a species of bird in the Old World flycatcher family Muscicapidae. It is endemic to Luzon island, in the Philippines. The natural habitat of the white-browed jungle flycatcher is tropical moist montane forests. It is threatened by habitat loss.

Luzon fruit bat Species of bat

The Luzon fruit bat is a species of megabat in the family Pteropodidae. It is monotypic within the genus Otopteropus. It is endemic to the Philippines. Its natural habitat is subtropical or tropical dry forest. It is threatened by habitat loss.

New Guinea Highlands Natural region in New Guinea

The New Guinea Highlands, also known as the Central Range or Central Cordillera, is a long chain of mountain ranges on the island of New Guinea, including the island's tallest peak, Puncak Jaya 16,024 ft (4,884 m), the highest mountain in Oceania. The range is home to many intermountain river valleys, many of which support thriving agricultural communities. The highlands run generally east-west the length of the island, which is divided politically between Indonesia in the west and Papua New Guinea in the east.

Wildlife of the Philippines Flora and fauna of the Philippines

The wildlife of the Philippines includes a significant number of endemic plant and animal species. The country's surrounding waters reportedly have the highest level of marine biodiversity in the world. The Philippines is considered one of the seventeen megadiverse countries as well as global biodiversity hotspot. In the 2000 Red List of the International Union for the Conservation of Nature and Natural Resources (IUCN), 418 of the country's 52,177 species were listed as threatened.

Luzon tropical pine forests

The Luzon tropical pine forests are a tropical coniferous forest ecoregion of the Philippines in the western Pacific Ocean. These pine forests are home to a large number of the island's endemic plants and animals.

Luzon rain forests Ecoregion in Luzon, the Philippines

The Luzon rain forests is a tropical moist broadleaf forest ecoregion on the island of Luzon. Luzon is the largest island in the Philippines, and the Luzon rain forests is the most extensive rainforest ecoregion of the country. The ecoregion includes the lowlands of Luzon and neighboring islands below 1000 meters elevation. Very little of the original rainforest remains, and the status of this area is critical/endangered.

The Sierra Madre ground warbler is a species of passerine bird in the family Locustellidae. It is endemic the Philippines on the island of Luzon in its northeastern and eastern side by the foothills of Sierra Madre.Its habitat is in tropical moist lowland and the lower reaches of tropical montane Forest. It along with its closest relatives the Cordillera ground warbler and Bicol ground warbler are one of the most elusive birds in the country due to their extremely shy nature. While not officially threatened its populations are said to be declining to do habitat destruction through deforestation.

Northern Sierra Madre Natural Park

The Northern Sierra Madre Natural Park is the largest protected area of the Philippines covering the northern range of the Sierra Madre mountains of eastern Luzon. The park is located in the eastern part of the province of Isabela in Cagayan Valley containing a total of 359,486 hectares. It was first declared a wilderness reserve encompassing an area within a 45 kilometres (28 mi) radius of Palanan Point known as the Palanan Wilderness Area through Letter of Instructions No. 917-A signed by President Ferdinand Marcos on 7 September 1979. On 10 March 1997, the area was converted into a natural park with the signing of Proclamation No. 978 by President Fidel Ramos.

Sierra Madre (Philippines)

The Sierra Madre is the longest mountain range in the Philippines. Spanning over 540 kilometers (340 mi), it runs from the province of Cagayan down to the province of Quezon, forming a north–south direction on the eastern portion of Luzon, the largest island of the archipelago. It is bordered by the Pacific Ocean to the east, Cagayan Valley to the northwest, Central Luzon to the midwest, and Calabarzon to the southwest. Some communities east of the mountain range, along the coast, are less developed and so remote that they could only be accessed by taking a plane or a boat.

Santa Marta montane forests

The Santa Marta montane forests (NT0159) is an ecoregion in the Sierra Nevada de Santa Marta, a massif on the Caribbean coast of northern Colombia. The ecoregion covers altitudes from near sea level up to around 3,300 metres (10,827 ft), where it gives way to Santa Marta páramo. The isolation of the massif and the range of elevations and climates has resulted in a wide variety of species including many endemics. The lower levels contained tropical rainforest, which has largely been cleared. Higher up, this gives way to cloud forest. Much of this has also been cleared for coffee plantations, pasture for sheep and cattle, and farming.

Mindanao montane rain forests Ecoregion in Mindanao, the Philippines

The Mindanao montane rain forests ecoregion covers the montane forests - the zone between the lowland forest and the treeline - in the mountains on the island of Mindanao in the Philippines. Because the ecoregion covers only elevations above 1,000 metres (3,300 ft), it exists in seven discontinuous patches surrounded by lowland rainforest. Biodiversity is high, both because of the isolation of separate mountain ranges that have led to species variation within the island, and because of the altitude zonation. Because most of the surrounding lowland forest has been cleared for human use, the montane regions have become an important refuge for rare and endemic species.

References

  1. 1 2 Eric Dinerstein, David Olson, et al. (2017). An Ecoregion-Based Approach to Protecting Half the Terrestrial Realm, BioScience, Volume 67, Issue 6, June 2017, Pages 534–545; Supplemental material 2 table S1b.
  2. 1 2 3 4 "Luzon montane rain forests". World Wildlife Fund.
  3. 1 2 3 4 5 6 7 8 9 McGinley, Mark. "Luzon Montane Rain Forests". The Encyclopedia of Earth. World Wildlife Fund, 30 May 2007. 24 May 2013.
  4. 1 2 3 4 Rickart, E. A.; Heaney, L. R.; Balete, D. S.; Tabaranza, Jr. (2010). "Small Mammal Diversity Along An Elevational Gradient In Northern Luzon, Philippines". Mammalian Biology - Zeitschrift für Säugetierkunde. 76 (1): 12–21. doi:10.1016/j.mambio.2010.01.006.
  5. 1 2 3 4 5 6 7 8 9 "Philippines". Conservation International (24 May 2013)
  6. 1 2 3 Poulsen, M. K. (1995). "The Threatened and Near-Threatened Birds of Luzon, Philippines, and the Role of the Sierra Madre Mountains in Their Conservation". Bird Conservation International. 5 (1): 79–115. doi: 10.1017/s0959270900002963 .
  7. Taylor, E. H. (1963). "New and Rare Oriental Serpents". Copeia. 1963 (2): 429–433. doi:10.2307/1441364. JSTOR   1441364.
  8. 1 2 Ploeg; Weerd (2003). "A New Future for the Philippine Crocodile, Crocodylus mindorensis" (PDF). The Technical Journal of Philippine Ecosystems and Natural Resources. 13 (1&2): 31–50.
  9. "Philippines". Protected Planet. Accessed 13 May 2020