Kinabalu montane alpine meadows
The Kinabalu montane alpine meadows are unique to the Indo-Pacific region in that they have been isolated from other mountain chains for many millions of years. This is one of only two ecoregions in the Indo-Pacific region to be globally outstanding for both bird and mammal richness and endemism (the other ecoregion is the Eastern Himalayan broadleaf forests). This montane refuge supports a disjunct distribution of Himalayan, Australasian, and Indomalayan species. Although the very apex of Mount Kinabalu is devoid of vegetation, the slopes and surrounding area have an exceedingly rich flora of approximately 4500 species in more than 180 families with 950 genera. This represents one of the richest concentrations of endemic plant species in the world and is the only Asian example of tropical alpine shrublands with high levels of endemism. This ecoregion supports the greatest concentration of wild orchids on Earth, with more than 750 species in more than sixty genera. This number accounts for more than one quarter of all orchid species found in Malesia.
Location and General Description
This ecoregion represents the upper montane habitat on Mt. Kinabalu and the Crocker Range and the surrounding upland areas in the Malaysian state of Sabah (Borneo). Thirty-five million years ago marine sediments were transformed to rock in the area where Mt. Kinabalu now stands. Approximately 25 million years ago these layers of shale and sandstone were uplifted to form a mountain range. The eroded remains of this range are now known as the Crocker Range. Approximately 15 million years ago a large mass of magma intruded between the folds of the Crocker Range and solidified into adamellite (a type of granite). This intrusion was uplifted rapidly, at a rate of one inch every five years. The exposed granite body, which is still growing, is Mt. Kinabalu. At 13,455 feet it is the highest mountain between the Himalayas and New Guinea. Based on the Köppen climate zone system, this ecoregions meteorology falls in the tropical wet climate zone.
Kinabalu is the meeting place for plant species from the Himalayas, China, Australia, New Zealand, and the Indo-Malayan realm. The vegetation of Kinabalu can be divided into zones based on altitude, but many factors may alter their distribution locally to either higher or lower elevations. Above 1000 meters (m) a montane zone exists until about 2600 m. This zone includes a mixing of lowland and montane families, giving this elevation zone a great diversity of life. The common lowland families, such as Dipterocarpaceae, Euphorbiaceae, Leuminosae, Myristicaceae, and Sapotaceae, begin to diminish, and they begin to be replaced by a great diversity of species from plant families such as Ericaceae, Myrtaceae, Fagaceae, Lauraceae, Magnoliaceae, and the majority of Bornean gymnosperms, including Podocarpus, Agathis, and Phyllocladus. The dipterocarp Shorea monticola occurs in this elevation belt but not in the lowlands. This elevation zone also supports a number of endemic species from Rhododendron, Lithocarpus, Magnolia, and Rhamnus. A large variety of pitcher plants, many endemic to Mt. Kinabalu, occur in this zone. The endemic species include Nepenthes edwardsiana, N. rajah, N. villosa, and N. burbidgeae. The most common species found in these forests is the spectacular Nepenthes lowii. Fig trees are also common in these forests. Borneo has 135 species of wild figs, with more than 78 species occurring on Kinabalu, including 13 endemic species. Kinabalu may have one of the richest fig floras in the world. This floristically rich area also supports Rafflesia tengku-adlinii (which occurs only on Trus Madi and in the Maliau Basin).
Between 2,600 and 3,200 meters is a band of ultrabasic rocks that give rise to a different type of vegetation. This vegetation ranges from the 10-m high Dacrydium gibbsiae to dwarf shrubs and includes moss, lichen, liverwort, and ferns. Above 3,200 m the soil cover soon disappears, giving way to granite. In areas where soil can support shrubs, species such as Leptospermum recurvum, Coprosma hookeri, and Rhododendron buxifolium dominate. On thinner soil, herbs such as Diplocosia kinabaluensis, Machaerarina falcata, and Ranunculus lowii are common.
This ecoregion contains more than 750 orchid species in more than sixty genera. This number accounts for more than one-fourth of all orchid species found in Malesia. Perhaps the most famous orchid species found on Kinabalu are the several species of slipper orchid, Paphiopedilum. However, because of intensive collecting, they are rarely seen. The montane region of Kinabalu presents a variety of microhabitats that have produced many orchid species common to Eria, Bulbophyllum, Dendrobium, Liparis, Dendrochilum, Pholidota, and Coelogyne.
|Table 1. Endemic and Near-endemic Mammal Species.|
|An asterisk signifies that the species range is limited to this ecoregion|
Most of the 114 mammal species found in this ecoregion live in the forest canopy. Only one-third of the mammal species are terrestrial. Common terrestrial species include three deer species, the Malaysian weasel (Mustela nudipes), small-clawed otter (Aonyx cinerea), and leopard cat (Felis bengalensis). The majority of the species live in the canopy of the forests. These species include many of the twenty-eight of the thirty-four squirrels known from Borneo, numerous bat species, tree shrews, slow loris, tarsier (Tarsius bancanus), grey leaf monkey (Presbytis aygula), red leaf monkey (P. rubicunda), orangutan (P. pygmaeus), Borneo gibbon (Hylobates moloch), linsang (Prionodon linsang), and binturong (Arctictis binturong). There are twelve near-endemic and four endemic mammal species, which include the Bornean black shrew (Suncus ater) and Bornean ferret-badger (Melogale everetti) (Table 1).
|Table 2. Endemic and Near-Endemic Bird Species.|
|Accipitridae||Mountain serpent-eagle||Spilornis kinabaluensis|
|Phasianidae||Red-breasted partridge||Arborophila hyperythra|
|Phasianidae||Crimson-headed partridge||Haematortyx sanguiniceps|
|Podargidae||Dulit frogmouth||Batrachostomus harterti|
|Trogonidae||Whitehead's trogon||Harpactes whiteheadi|
|Capitonidae||Mountain barbet||Megalaima monticola|
|Capitonidae||Golden-naped barbet||Megalaima pulcherrima|
|Capitonidae||Bornean barbet||Megalaima eximia|
|Eurylaimidae||Whitehead's broadbill||Calyptomena whiteheadi|
|Pachycephalidae||Bornean whistler||Pachycephala hypoxantha|
|Turdidae||Everett's thrush||Zoothera everetti|
|Muscicapidae||Eyebrowed jungle-flycatcher||Rhinomyias gularis|
|Zosteropidae||Black-capped white-eye||Zosterops atricapillus|
|Zosteropidae||Pygmy white-eye||Oculocincta squamifrons|
|Zosteropidae||Mountain black-eye||Chlorocharis emiliae|
|Sylviidae||Bornean stubtail||Urosphena whiteheadi|
|Sylviidae||Friendly bush-warbler||Bradypterus accentor|
|Timaliidae||Sunda laughingthrush||Garrulax palliatus|
|Timaliidae||Bare-headed laughingthrush||Garrulax calvus|
|Timaliidae||Mountain wren-babbler||Napothera crassa|
|Timaliidae||Chestnut-crested yuhina||Yuhina everetti|
|Dicaeidae||Black-sided flowerpecker||Dicaeum monticolum|
|Nectariniidae||Bornean spiderhunter||Arachnothera everetti*|
|Nectariniidae||Whitehead's spiderhunter||Arachnothera juliae|
|An asterisk signifies that the species range is restricted to this ecoregion|
This ecoregion also supports more than 180 bird species. The bird fauna includes twenty-four near-endemic species and one endemic species (Table 2). The ecoregion overlaps with a portion of the Bornean Mountains Endemic Bird Area (EBA) (157).
About one-third of this sensitive, high-altitude ecoregion has been cleared or degraded, mostly by agriculture or other practises associated with forest clearance. There are two protected areas in the ecoregion that cover a total of 1440 square kilometres (33 percent) (Table 3). Kinabalu Park was gazetted in 1964, and the Crocker Range National Park was established in this ecoregion in 1984.
Types and Severity of Threats
|Table 3. WCMC(1997) Protected Areas that Overlap with the Ecoregion.|
|Protected Area||Area (km2)||IUCN Category|
|Ecoregion numbers of protected areas that overlap with additional ecoregions are listed in brackets|
The unique flora found on the slopes of Mt. Kinabalu is protected to some extent by the steepness of the terrain and poor soil conditions, which discourage logging and farming. Nevertheless, some of the surrounding slopes outside the park boundary are being cleared for farming, mainly of vegetables. Road construction has facilitated tourist access to Kinabalu Park, which has led to the construction of more facilities. Some of these developments have been poorly planned and even detrimental, such as the degazettement of a large area of alluvial Pinosuk Plateau in 1984 for government development projects such as a golf course and the 1984 redesignation of Trus Madi from a watershed protection forest to that of a commercial forest reserve to allow logging to take place. Commercial logging may have encroached into the park, and a section of the park was excised in 1974 for the development of a copper mine. A number of species, especially the rare and endemic species in the ecoregion, are being overcollected for the commercial wildlife and plant trade. These problems are exacerbated by the absence of buffer zones around the park and insufficient staff to enforce regulations.
Justification of Ecoregion Delineation
The large island of Borneo was divided into nine ecoregions. MacKinnon and MacKinnon divided the island's lowland forests into six subunits with a central subunit representing the montane forests. MacKinnon revised the boundaries of these seven subunits but retained the same general configuration. These authors used the major rivers, the Kapuas and Barito, to represent zoogeographic barriers to a few species of mammals and based subunits largely on these barriers but also used climatic regimes for the drier eastern biounits.
Because ecoregions are based on biomes, one must first isolate the central montane ecoregion—the Borneo montane rainforests—above the 1000-metres elevation contour using the Digital Elevation Model. One next assigns the large patches of peat forests, heath forests, freshwater swamp forests, and mangroves, in the lowlands and along the periphery of the island, into their own ecoregions: the Borneo peat swamp forests, Sundaland heath forests (which also includes Belitung Island and the heath forests on Bangka Island), and Southern Borneo freshwater swamp forests, and Sunda Shelf mangroves, respectively. The alpine habitats of the Kinabalu Mountain Range were represented by the Kinabalu montane alpine meadows. Udvardy combined all of Borneo into the Borneo biogeographic province.
- Cockburn, P. F. 1978. The flora. Pages 179-198 in D. M. Luping, C. Wen, and E. R. Dingley (editors) Kinabalu: Summit of Borneo. Sabah Malaysia: The Sabah Society.
- Corner, E. J. H. 1952. Wayside trees of Malaya. Vol. 1 & 2. Singapore. ISBN: 9679990605
- Corner, E. J. H. 1978. The plant life. Pages 112-178 in D. M. Luping, C. Wen, and E. R. Dingley (editors), Kinabalu: Summit of Borneo. Sabah, Malaysia: The Sabah Society.
- Davis et al. 1995. Centres of Plant Diversity: A Guide and Strategy for Their Conservation. Volume 2: Asia, Australasia and the Pacific. Cambridge: IUCN. ISBN: 2831701988
- Jacobson, G. 1978. The geology. Pages 101-111 in D. M. Luping, C. Wen, and E. R. Dingley (editors), Kinabalu: Summit of Borneo. Sabah, Malaysia: The Sabah Society.
- Lamb, A., and C. L. Chan. The orchids. Pages 219-254 in D. M. Luping, C. Wen, and E. R. Dingley (editors), Kinabalu: Summit of Borneo. Sabah, Malaysia: The Sabah Society.
- MacKinnon, J., and K. MacKinnon. 1986. Review of the Protected Areas System in the Indo- Malayan Realm. Gland, Switzerland and Cambridge, UK: IUCN/UNEP publication. ISBN: 2880326095
- MacKinnon, J. 1997. Protected areas systems review of the Indo-Malayan realm. Canterbury, UK: The Asian Bureau for Conservation (ABC) and The World Conservation Monitoring Center (WCMC)/ World Bank Publication.
- Myers, L. C. 1978. The geomorphology. Pages 91-100 in D. M. Luping, C. Wen, and E. R. Dingley (editors), Kinabalu: Summit of Borneo. Sabah, Malaysia: The Sabah Society.
- National Geographic Society. 1999. National Geographic Atlas of the World: Seventh Edition. Washington, DC: National Geographic Society. ISBN: 0792267559
- Stattersfield, A. J., M. J. Corsby, A. J. Long, and D. C. Wege. 1998. Global Directory of Endemic Bird Areas. Cambridge, UK: Birdlife International.
- Udvardy, M. D. F. 1975. A classification of the biogeographical provinces of the world. IUCN Occassional Paper No 18.
- U. S. G. S. 1996. Global 30 arc second elevation data (Gtopo30). EROS data center.
- World Wide Fund for Nature (WWF) and The World Conservation Union (IUCN) 1995. Centres of Plant Diversity: A Guide and Strategy for Their Conservation. Volume 2: Asia, Australasia and the Pacific. Cambridge: IUCN. ISBN: 2831701988
- Ecoregions of Malaysia
- Malaysia Geography Collection
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