Overview

Distribution

Range Description

This species occurs only on Borneo, and lives throughout the island (Payne et al. 1985); many specific localities are given in Groves and Grubb (1982). No information was traced concerning presence in Brunei but it presumably lives there. It is present in both Indonesia (Kalimantan) and Malaysia (Sabah and Sarawak). The Bornean Yellow Muntjac is known from most of the forest protected areas in Sarawak, including Bako National Park, Lanjak-Entimau Wildlife Sanctuary, Similajau National Park, Lambir Hills National Park, Samunsam National Park, Gunung Gading National Park (in the lowland part), Mulu and Niah National Park, and has also been recorded in logged forest in the Bintulu area and in oil palm adjacent to recently logged forest in north-east of Bintulu (Belden Giman pers. comm. 2008).
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Geographic Range

Muntiacus atherodes, commonly called Bornean yellow muntjacs, is found throughout the island of Borneo.

Biogeographic Regions: oriental (Native )

Other Geographic Terms: island endemic

  • Payne, J., C. Francis. 1985. A Field Guide to the Mammals of Borneo. Malaysia, Malaysia: Sabah Society.
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Physical Description

Morphology

Physical Description

Bornean yellow muntjacs are characterized by a yellowish-orange hue to their fur. They have a darker stripe on the nuchal region which becomes yellowish-orange on the sides and then whitish on the belly. The tail has a dark nuchal stripe and the pale ventral color and is 14 to 20 cm in length. The under part of the throat retains the ventral paleness. The ears are sparsely haired with coloration ranging from deep brown to yellowish or grayish brown with creamy or whitish markings (Nowak, 1999). Males have slender, simple horns of 16 to 42 mm in length. Males lack both frontal tufts of hair and antler burrs (Payne and Francis, 1985). Females have small, bony knobs and tufts of hair in place of horns. Males also have modified upper canines that curve strongly outward from the lips, forming small tusks (Norwak, 1999). At birth, fawns possess lines of white spots on the upper parts of their bodies. These spots remain until they are half their adult size (Payne and Francis, 1985).

Range mass: 13 to 18 kg.

Range length: 90 to 100 cm.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry

Sexual Dimorphism: ornamentation

  • Whitehead, G. 1993. The Whitehead Encyclopedia of Deer. Stillwater, MN: Voyageur Press, Inc..
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Payne et al. (1985) stated that “available data suggests that this species predominates over the Red Muntjac in low hill ranges and coastal regions”, but Meijaard and Sheil (2008) pointed out that still “no robust quantitative data exist to support this [pattern]”. A partial review of altitudes associated with museum specimens by R.J. Timmins (pers. comm. 2008) suggests no readily apparent difference between M. atherodes and M. muntjak in the altitudes of historically collected animals, in fact there appear to have been very few muntjac collected at altitudes over 900 m asl, presumably partly reflecting the relatively small area of Borneo above such altitudes. There is, however, an opinion by many field observers that Bornean Yellow Muntjac is genuinely absent from mountains. It is common in Sungai Wain forest, Kalimantan, which spans 30–150 m asl, and clearly outnumbers M. muntjak there (G.M. Fredriksson pers. comm. 2008). It also seems to be the predominant species in Sarawak Planted Forests, Bintulu Division, a mix of Acacia mangium plantation and natural forest, where it uses mature and immature plantation, freshly logged forest and relict tall forest; nearby it has also been found in oil palm (Belden et al. 2007; Belden Giman pers. comm. 2008). In the Ulu Segama area of Danum Valley Conservation Area, Sabah, mostly at about 300 m asl, M. atherodes is slightly more common than M. muntjak (Siew Te Wong pers. comm. 2008). Muntjacs were frequently seen, suspected to comprise roughly equal numbers of the two species, in the Batang Ai National Park, Sarawak, which lies mostly at 100–760 m asl (Meredith 1995). M. atherodes occurs down to sea-level (in e.g. Similajau National Park, Sarawak; Duckworth 1997) and up to at least 3,000 feet (approximately 900 m asl), based on specimens in the Field Museum (Chicago, USA). Mohd Azlan J. (pers. comm. 2008) has recorded muntjacs provisionally recorded as this species in hill dipterocarp forest at both Lambir Hills National Park and Lanjak Entimau Wildlife Sanctuary. Field observation suggests that it occurs naturally only below 1,000 m asl, although semi-captive individuals live as high as 3,000 m asl (Belden Giman pers. comm. 2006). It uses both primary and secondary forest (Matsubayashi and Sukor 2005; Belden Giman pers. comm. 2008), although no specific information is available on its tolerance to severe degradation and fragmentation. It presumably cannot survive complete forest conversion, but this has not been demonstrated or even, it seems, investigated.

Its diet includes herbs, seeds, grass and fruits (Payne et al. 1985). It is mostly active during the daytime (Payne et al. 1995, Yasuma and Abdullah 1997) but at least sometimes at night (Duckworth 1997). It lives in small territories and moves either in pairs or alone (Payne et al. 1995). Breeding seasonality is unknown.

Systems
  • Terrestrial
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Bornean yellow muntjacs are terrestrial ungulates that live in variety of habitats, including moist forests, low hills, coastal regions, and areas of dense vegetation. They are not normally found far from water (Nowak, 1999). They are found from 0 to 1200m (ARCBC, 2006).

Range elevation: 0 to 1200 m.

Habitat Regions: tropical ; terrestrial

Terrestrial Biomes: forest ; rainforest ; scrub forest

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Trophic Strategy

Food Habits

Bornean yellow muntjacs feed on an assortment of vegetation: leaves, fruits, shoots, grasses, herbs, and seeds. They are mainly diurnal, feeding throughout the day.

Plant Foods: leaves; wood, bark, or stems; seeds, grains, and nuts; fruit

Primary Diet: herbivore (Folivore , Frugivore )

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Associations

Ecosystem Roles

There is little available information on the ecosystem role of Bornean yellow muntjacs. They may help to disperse the seeds of fruit trees by eating them and they act as prey to large, forest predators.

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Predation

Known predators of Bornean yellow muntjacs include clouded leopards (Neofelis nebulosa) and humans.

Known Predators:

Anti-predator Adaptations: cryptic

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Life History and Behavior

Behavior

Communication and Perception

Muntjacs, in general, are known as ‘barking deer’ due to the short, sharp, loud, and deep bark-like call they produce. When alarmed, the barking of Bornean yellow muntjacs can last for more than an hour. The frequency of barking increases in circumstances of reduced visibility (Nowak, 1999). A short, high-pitched mewing sound is emitted by females with young (Payne and Francis, 1985). Muntjacs also use the secretions from their pre-orbital glands to communicate reproductive state, territorial boundaries, and to cement social bonds.

Communication Channels: visual ; acoustic ; chemical

Perception Channels: visual ; acoustic

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Life Expectancy

Lifespan/Longevity

There is little available information on the lifespan of Bornean yellow muntjacs.

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Reproduction

Little is known about mating in Bornean yellow muntjacs. Mating systems and behavior may be similar to other, better studied, species of muntjacs, where males compete for access to females in estrous.

Bornean yellow muntjacs are polyestrous and breed throughout the year. Their estrus cycle lasts between 14 and 21 days and gestation between 210 and 215 days. Typically a single fawn is born, very rarely twins. The fawn will stay hidden in thick vegetation until it is able to move about with its mother (Norwak, 1999). Weaning lasts between 2 months (Walker, 2006) to halfway into the next pregnancy, which will be conceived just a few days after a fawn is born (Whitehead, 1993). Sexual maturity will be reached within 6 to 12 months (Huffman, 2006).

Breeding interval: Female Bornean yellow muntjacs can have several offspring each year, depending on the availability of high quality nutrition.

Breeding season: Bornean yellow muntjacs breed throughout the year.

Range number of offspring: 1 to 2.

Average number of offspring: 1.

Range gestation period: 7 to 7.17 months.

Average weaning age: 2 months.

Range age at sexual or reproductive maturity (female): 6 to 12 months.

Range age at sexual or reproductive maturity (male): 6 to 12 months.

Key Reproductive Features: iteroparous ; year-round breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous

Females lactate and protect their young. Otherwise, little is known about parental investment in the young. Like other muntjacs, Bornean yellow muntjacs are somewhat precocial when born and develop rapidly.

Parental Investment: precocial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female)

  • Nowak, R. 1999. Walker's Mammals of the World. 6th edition. Baltimore, MD.: John Hopkins University Press.
  • Whitehead, G. 1993. The Whitehead Encyclopedia of Deer. Stillwater, MN: Voyageur Press, Inc..
  • Huffman, B. 2006. "The Ultimate Ungulate Page" (On-line). Accessed October 14, 2006 at http://www.ultimateungulate.com/Artiodactyla/Muntiacus_atherodes.html.
  • Walker, . 2006. "World Deer Website" (On-line). Accessed October 14, 2016 at www.worlddeer.org.
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2008

Assessor/s
Timmins, R.J., Giman, B., Duckworth, J.W. & Semiadi, G.

Reviewer/s
Black, P.A. & Gonzalez, S. (Deer Red List Authority)

Contributor/s

Justification
M. atherodes apparently remains widespread and at least locally common. Although predominantly a lowland species, it occurs substantially above the level lowlands; in these latter areas the pace of forest conversion is alone sufficient to result in listing as Vulnerable or Near Threatened for forest obligates (see BirdLife International 2001), but this muntjac has too wide an altitudinal range for this to be applied. Muntjacs are subject to intense harvesting, and there is good evidence from Malaysian Borneo that this depresses population densities. There is also evidence (from one site; but no other study contradicts this) that Yellow Muntjac is more scarce in logged than in old-growth forest, in contrast to the pattern shown by sympatric M. muntjak. Hunting, logging and post-logging conversion to non-forest are ongoing and can be predicted to continue to reduce populations. However, this species remains common in some areas with both heavy hunting and habitat conversion. Therefore, rates of decline cannot be calculated or inferred (even of muntjac spp., let alone of determining whether M. atherodes is changing in relative frequency). Concerning the appropriate red list category for this species, there was little convergence of opinion among people surveying mammals on Borneo, except that it is unlikely to fall in any of the threatened categories. Some felt strongly that it is unlikely that Bornean Yellow Muntjac could be declining fast enough to warrant listing even as Near Threatened, and thus even though Data Deficient would be defensible, it would overstate the magnitude of uncertainty in conservation status (which can plausibly be only Least Concern or Near Threatened). Thus, with large reservations, it is listed here as Least Concern, an assessment based on few precise data and which warrants review whenever a clearer picture is available.
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Bornean yellow muntjacs are listed as primarily lower risk on the IUCN's 2006 Red List of Threatened Animals. Additionally, they fall into the sub-category of least concern (IUCN, 2006). However, hunting pressure on this species is high. They are attracted to grazing areas near roads and in forest cuts, making them more susceptible to hunting (Meijaard et al., 2006).

US Federal List: no special status

CITES: no special status

IUCN Red List of Threatened Species: least concern

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Population

Population
This species appears to be widespread and common throughout its range, wherever appropriate habitat occurs (Yasuma and Abdullah 1997, Belden Giman pers. comm. 2006; see further discussion in Habitat and ecology). Numbers seem to be in some decline in the Indonesian part of Borneo (Semiadi 2005). They may also be in decline in Malaysian Borneo (Bennett et al. 2000), although this study did not distinguish the two species of muntjac. However, around the Bintulu lowlands the species remains common despite major habitat disruption and high levels of hunting (Belden Giman pers. comm. 2008).

Population Trend
Decreasing
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Threats

Major Threats
Habitat encroachment and hunting are both widespread on Borneo. Indeed, they are often associated and all the island’s ungulates suffer from the increased hunting that often accompanies logging (Bennett and Dahaban 1995, Bennett and Gumal 2001), such that hunting to local extinction is the chief detrimental effect of logging on ungulates in Sarawak (Bennett and Gumal 2001). Hunting is for meat, medicine and hides.

The extent to which habitat encroachment and hunting constitute threats specifically to M. atherodes is unclear, reflecting a paucity of studies to determine its resilience. Logging has been reported to lead to slight decreases in densities of the species, and this seems to be due to habitat change per se rather than elevated hunting (which usually accompanies logging; Bennett and Gumal 2001) because M. muntjak in the same study was found to increase strongly after logging (Heydon 1994). In the Sarawak Planted Forests, Bintulu Division, Sarawak, muntjacs (probably mostly this species) are among the commonest species camera-trapped in young Acacia mangium plantations (under four years old) and have been seen browsing on young acacia shoots. Footprints are common in the adjacent newly planted areas and forest fragments (Belden Giman pers. comm. 2008). However, this area contains a substantial proportion of natural, if somewhat degraded, forest, which in theory might be found to be necessary for populations in the highly altered habitats. Information on the species in landscape-scale plantations has not been traced. In terms of coping with fragmentation, M. atherodes has survived at least for several years in several forest isolates of 100 km² or less, Similajau National Park (Sarawak; J.W. Duckworth pers. comm. based on observations in 2005), Sepilok Forest Reserve (only 42 km²; muntjacs not confirmed as this species; Siew Te Wong pers. comm. 2008), and Sungai Wain (Kalimantan; G.M. Fredriksson pers. comm. 2008); in the latter, where there is little hunting except around the margins, it is common. But the current carving up of the formerly extensive forest of lowland Borneo is so recent that determining long-term persistence in such fragments is impossible; doomed populations in slow but fixed decline may account for records in fragmented and degraded areas. There is no good evidence that any muntjac is tied to old-growth forest, however, even in areas where two or more species are sympatric (R.J. Timmins pers. comm. 2008).

Muntjacs are widely and heavily hunted on Borneo for meat, skins, and as a source of traditional remedies (Bennett et al. 2000; Mohd Azlan J. pers. comm. 2008; Belden Giman pers. comm. 2008; G. M. Fredriksson pers. comm. 2008; A. C. Sebastian pers. comm. 2008; Siew Te Wong pers. comm. 2008). Traditionally, hunting used traps, dogs and spears, and blowpipes. Hunters in remote parts of the interior still use these methods, but most animals now die by gunfire. Sarawak held 60,000 legally registered shotguns while Sabah held almost 13,000 in the mid 1990s (Bennett et al. 2000). Methods used in Indonesia include guns and spotlights along logging roads, snaring, and dogs (G. M. Fredriksson pers. comm. 2008). The combination of dogs and guns may be particularly efficient (Belden Giman pers. comm. 2008). Snaring is still very heavy outside well-secured areas, but at least in some areas seems not to catch many of this species: Belden Giman (pers. comm. 2008) found during interviews with 75 longhouses inside the Sarawak Planted Forests (Bintulu) that the highest percentage (73% and 12%) of game species caught by snares were pigs and porcupines respectively; muntjacs (both species) totalled less than 2% of animals, even though in this area they are common. Shotguns remain the even bigger problem (Bennett et al. 2000; Mohd Azlan J. pers. comm. 2008; Siew Te Wong pers. comm. 2008). Unaccompanied packs of stray or even perhaps feral dogs are also likely to be a threat, particularly in forest isolates close to urban areas (e.g. Similajau National Park; J.W. Duckworth pers. comm. 2008). It is unlikely that hunters make any distinction between the two Bornean muntjac species directly, although it is plausible that M. atherodes is under higher hunting pressure than is M. muntjak reflecting its purported predominance in the lowlands, where most of the logging concessions currently lie. Plantation estates are also concentrated in the lowlands, but Bennett et al. (2000) found that hunting levels in them were low, not least because they supported so few animals would-be hunters had to journey to forest areas. Even when these were nearby, few labourers were hunting, because of the demands of their job, and, crucially, the disincentives by plantations companies for them to own shotguns. As non-locals with limited financial security, most followed employer rules preventing ownership of guns. Experience elsewhere shows that in such situations, local hunters may see such concentrations as potential markets, therefore leading to an increase in hunting even though it is not undertaken directly by the labourers. As plantations cover ever more Bornean lowlands, this may become a more significant stimulant of hunting. Also, although some ethnic groups, at least the Punan, have traditional beliefs against eating muntjac meat (Belden Giman pers. comm. 2008), over most of (at least) Malaysian Borneo, “in general, everyone will hunt and eat anything” (Bennett et al. 2000). Much hunting is for the market rather than local use, so there is a limitless demand. Bennett and Gumal (2001) profiled the hunting of ungulates in Sarawak in the mid 1990s thus: muntjacs (along with Bearded Pig Sus barbatus and Sambar Rusa unicolor) are heavily shot for wild meat trade across Sarawak, and these ungulates are the species most sought be the restaurants. Wild meat is widely sold in towns, villages, restaurants and logging camps throughout Sarawak; 250 sales outlets were estimated across the state in 1996, with an annual trade worth 3.75 million USD. Along the Rejang river alone, in the mid 1980s, 250 muntjacs were sold per year (Caldecott 1988). The market for meat is great and in the 1990s was probably expanding. There were, then, no controls on commercial hunting of non-protected species (including muntjacs). The implementation of the Master Plan for Wildlife in Sarawak (Wildlife Conservation Society and Sarawak Forest Department 1996) introduced a strict ban on all wildlife trade, shotgun ownership and cartridge sales in the late 1990s (Bennett and Gumal 2001). Substantial numbers of muntjacs are, nevertheless, still killed in the state, as they are elsewhere in Borneo.

Bennett et al. (2000) considered the effects of this onslaught upon muntjacs (not distinguished to species) through a lengthy hunting study in February 1993 to June 1995, in both Bornean states of Malaysia (Sarawak and Sabah), each with eight study areas. Muntjacs constituted only 4–11% of animals killed, but index counts of signs show an inverse relationship between sign index and hunting pressure so strong that the latter over-rode the effects of habitat variables in determining their densities. Hunting was so ubiquitous, even in protected areas, that in the two states, only one site (part of Danum Valley, Sabah) could be found as a control, where there was primary forest but negligible hunting levels. They concluded that “the only single factor offering any effective protection for [quarry species of] wildlife is difficulty of access”; whether animals are protected or non-protected species, inside or outside protected areas, had no significant restraint on hunting levels. Since that study, much forest has been converted and muntjac populations in the smaller and more isolated areas that remain must now be more vulnerable to local extinctions.
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Management

Conservation Actions

Conservation Actions
Yello Muntjac are known from many protected areas in Malaysia and Indonesia. Protected area coverage in the lowland plains is still relatively limited in Borneo, and many areas are, in terms of forest ungulate protection, sufficiently small (under 100 sq. km) that long-term persistence cannot be assumed; most places will require continuous hands-on activities against poaching. Even protected areas are not securing lowland forest on current trends, at least in some parts of Borneo: Curran et al. (2004) demonstrated substantial loss of lowland forest within protected areas of Indonesian Borneo. Indonesian forestry law protects all species of muntjac (D. Martyr pers. comm. 2008).

Heavy hunting with shotguns was found to be a severe problem for larger mammals and birds across Sarawak and the need for its control (of guns and of sale of ammunition, with firm legal underpinnings) was recognised in the Master Plan for Wildlife in Sarawak (Wildlife Conservation Society and Sarawak Forest Department 1996). As everywhere, people devise ways for circumventing the controls (illegal trade in bullets and locally made shot-guns, called bekakok, which have no administrative or legal paper-trail) and strong enforcement is required for the foreseeable future.

The long-term persistence of large populations of Bornean Yellow Muntjac, as distinct from isolated populations in well-secured protected areas, will depend upon their ability to use plantation landscapes of oil palm, rubber, acacia and others. Clarification of this is needed to assess the species’s conservation priorities. Of particular concern is the finding from Sabah suggesting that M. atherodes may be more a species of old-growth forest and M. muntjak the predominant species of logged areas (Heydon 1994). It is urgent to determine whether this is a generally applicable pattern across Borneo.

Close liaison with plantation estates and other employers of large numbers of labourers is essential as this offers the best medium to control hunting by employees. As the proportion of plantation rises this will become ever more important. Similar arrangements are needed with logging concession-holders, even more importantly because of the high hunting levels by loggers.

In future studies, ways of enhancing information specific to muntjac species need to be sought and implemented. Many of the studies reviewed here would not, for example, have detected wild changes in the relative proportions of the two muntjac species within their results concerning muntjac spp. This is a major concern, given that M. atherodes is everywhere sympatric with M. muntjak. With cheap digital cameras now available, some form of photography, by the hunter, of each animal killed should be considered (and this would be beneficial for other Bornean genera with closely similar species, e.g. chevrotains Tragulus). Most of the grey literature was not available to the present review and much could be learnt from a more comprehensive trawl of it and of active surveyors.
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Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Negative

Bornean yellow muntjacs are considered a nuisance because they destroy trees by stripping off bark.

Negative Impacts: crop pest

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Economic Importance for Humans: Positive

Bornean yellow muntjacs are hunted for their skins and meat.

Positive Impacts: food ; body parts are source of valuable material

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Wikipedia

Bornean yellow muntjac

The Bornean yellow muntjac (Muntiacus atherodes) is restricted to the moist forests of Borneo where it lives alongside the common muntjac. It is similar to its much more common cousin and was only recently recognised as a separate species. Apart from the color difference, its antlers, which are just 7 cm (2.8 in) in length, are smaller than those of the common muntjac. It has not been extensively studied and has been described a relict species.

References[edit source | edit]

  1. ^ Timmins, R.J., Giman, B., Duckworth, J.W. & Semiadi, G. (2008). Muntiacus atherodes. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 5 April 2009. Database entry includes a brief justification of why this species is of least concern.
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