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Shorea guiso 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Theales Dipterocarpaceae

Scientific Name: Shorea guiso (Blanco) Blume
Common Name(s):
English dfgadfg, Red Balau
Synonym(s):
Shorea longipetala Foxworthy

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2cd ver 3.1
Year Published: 2017
Date Assessed: 2017-03-08
Assessor(s): Khou, E., Luu, H.T., Pooma, R., Newman, M. & Barstow, M.
Reviewer(s): Chua, L.S.L.
Facilitator/Compiler(s): Rivers, M.C.
Justification:
Shorea guiso is a large, timber tree species. It is native to the lowland dipterocarp forests of Lao PDR, Cambodia, Viet Nam, Malaysia, Indonesia and the Philippines. The species is globally assessed as Vulnerable. The population has undergone more than a 30% reduction in the past three generations and decline will continue into the future but at an unknown rate. Decline is due to extensive logging of the species for timber and as part of forest clearance for agricultural expansion. These activities are still a threat to the species. The species is present in protected areas but only three ex situ collections. Further ex situ collections of the species need to be made and the species remaining habitat requires protection. Harvest management and the sustainable use of the species should be implemented. The species is found within fragmented forests; the impact of this on the species requires investigation. Work within the Philippines should continue to find the best way to regenerate the species as it suffers from a lack of regeneration potential.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is native to south east Asia. It is found in Lao PDR, Cambodia, Viet Nam, Peninsular Malaysia, Sumatra, The Philippines and Borneo. On Borneo the species is present within Sabah, Sarawak and Kalimantan. The species grows on at least eight islands in the Philippines including Mindoro, Luzon and Panay (de Guzman et al. 1986). The species is found at low altitudes, 0–700m asl and it has an estimated extent of occurrence (EOO) of over 4 million km2.
Countries occurrence:
Native:
Cambodia; Indonesia (Kalimantan, Sumatera); Lao People's Democratic Republic; Malaysia (Peninsular Malaysia, Sabah, Sarawak); Philippines; Viet Nam
Additional data:
Upper elevation limit (metres):700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is widespread and common. In Peninsular Malaysia there are an estimated 473,000 adult stems in Permanent Reserved Forests (Chua et al. 2010). Within Sabah the species is one of the dominant emergent trees in Parashorea malaanonan forest (Ghazoul et al. 2016) but the species is rarer in Sarawak (Ashton 2004). The Philippine population of this species is now much smaller than it once was (Patricio et al. 2006) and the population survives in forest fragments (Aggangan et al. 2012). The species has a generation length of 100 years. Overall the population size of this species is not known but population is in decline. It has undergone more than a 30% reduction in the past three generations (300 years) due to logging and agricultural expansion. These threats have yet to cease so decline is likely to continue into the future but at a currently unknown rate.
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This emergent tree species can grow to over 60 m tall (Ashton 2004). It grows in lowland, mixed dipterocarp, evergreen forest. The species is most abundant along the coast and on coastal hills. The species can also be found in limestone geologies where it grows in pockets and gullies of deeps soil (Ghazoul et al. 2016). Within Cambodia the tree flowers from January to February and fruits within April to May (CTSP 2017) but within the Philippines the species flowers in June (de Guzman 1986). Like most Dipterocarpaceae this specie exhibits irregular flowering and fruiting and low seed viability (Patricio et al. 2006). The species forms ectomycorrhizal relationships which improve tree growth (Aggangan et al. 2012). The habitat of this species is currently in decline and subject to fragmentation due to development of agriculture across the species range.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):100

Use and Trade [top]

Use and Trade: This species is used for timber. It is a light hardwood species that is commercially valuable. It is used in the production of furniture, cabinets, ship and boat frames,and for construction purposes (de Guzman et al. 1986). Resin can be harvested from the tree wand used to varnish boats and furniture. The species can be found within plantations within Malaysia, Indonesia and the Philippines (Weinland 1998).

Threats [top]

Major Threat(s): This species is threatened by selective logging for its commercially valuable timber. The species is also threatened by habitat loss through non-discriminatory felling and forest clearance for the expansion of agriculture and settlements. The species also suffers from low regeneration as seed production and viability is low (Patricio et al. 2006). It is also limited as it requires ectomycorrhizal association for most productive growth (Aggangan et al. 2012).

Conservation Actions [top]

Conservation Actions: This species is reported from three ex situ collections (BGCI 2017). Further ex situ collections of this species should be made which represent the species entire native range. The species occurs in protected areas across its range. Within Peninsular Malaysia, Sabah and Sarawak the species is assessed as Near Threatened (Chua et al. 2010). Within the Philippines this species is considered of conservation priority and is frequently featured in efforts to regenerate degraded and over logged landscapes (Patricio et al. 2006 and Aggangan et al. 2012). Research is conducted here to discover the best way to propagate the species; this work should continue. Research is also required to understand the effect of fragmentation on the species. Remaining habitat of the species should be protected and harvest of the species monitored and managed. It is also recommended that initiatives that promote the sustainable use of the forests and this species are established.

Citation: Khou, E., Luu, H.T., Pooma, R., Newman, M. & Barstow, M. 2017. Shorea guiso. The IUCN Red List of Threatened Species 2017: e.T33114A2832842. . Downloaded on 17 December 2017.
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