Luzon montane rain forests | |
---|---|
Ecology | |
Realm | Indomalayan |
Biome | tropical and subtropical moist broadleaf forests |
Borders | |
Geography | |
Area | 8,273 km2 (3,194 sq mi) |
Country | Philippines |
Conservation | |
Conservation status | Critical/endangered |
Protected | 3,813 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]
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, Mount Banahaw, Mount Isarog, Mayon Volcano, and Bulusan Volcano. [2] Also within the ecoregion are the Northern and Southern Sierra Madre, Mount Sapacoy, Mount Magnas, and Mount Agnamala in the northern Cordillera Central highlands and the Zambales Mountains in the west. [3]
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]
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]
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]
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) 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]
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]
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]
The Philippines is an archipelago that comprises 7,641 islands, and 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 the World Wide Fund for Nature (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". 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.
The Vanuatu rain forests are tropical and subtropical moist broadleaf forests ecoregion which includes the islands of Vanuatu, as well as the Santa Cruz Islands group of the neighboring Solomon Islands. It is part of the Australasian realm, which includes neighboring New Caledonia and the Solomon Islands, as well as Australia, New Guinea, and New Zealand.
The Solomon Islands rain forests are a terrestrial ecoregion covering the Solomon Islands archipelago.
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.
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.
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 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.
The Luzon fruit bat is a species of megabat in the family Pteropodidae. It is the only species within the genus Otopteropus and is endemic to the Philippines. Its natural habitat is subtropical or tropical dry forest.
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 one of the seventeen megadiverse countries and is a global biodiversity hotspot. In 2013, 700 of the country's 52,177 species were listed as threatened.
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.
The Luzon rain forest is a tropical moist broadleaf forest ecoregion on the island of Luzon. Luzon is the largest island in the Philippines, and the Luzon rain forest 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 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 September 7, 1979. On March 10, 1997, the area was converted into a natural park with the signing of Proclamation No. 978 by President Fidel Ramos.
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.
The Santa Marta páramo (NT1007) is an ecoregion containing páramo vegetation above the treeline in the Sierra Nevada de Santa Marta mountain range on the Caribbean coast of Colombia. The isolated position of the range has allowed unique species to evolve. Some are related to those found in Central America and the Caribbean coastal areas, and some to species from the Andes. The habitat is relatively stable, but has been drastically changed from the original by long-term human activity.
The Cordillera de Merida páramo (NT1004) is an ecoregion containing páramo vegetation above the treeline in the Andes mountain range of Venezuela. The isolated habitat has many endemic species. It is relatively stable and intact.
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.
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.
The Mindoro rain forests ecoregion covers the island of Mindoro, which lies between the island of Luzon and the Palawan Archipelago in the Philippines. The island has been subject to heavy commercial logging, with the only original forests remaining on the high ridge of the central mountain range. Logging has been reduced long enough on the east side of the mountains to support a regrown forest and a number of endemic species.