Overview

Brief Summary

Biology

The Philippine tube-nosed bat breeds seasonally, with females giving birth to one young each year between April and May. Young females first become pregnant at around seven to eight months old, producing their first young four and a half to five months later, at about one year of age. By contrast, males are thought to reach sexual maturity a little later than females, at approximately one year of age. Lactation lasts three to four months, but little else is known about parental behaviour in raising the young (3). This forest bat is known to feed on wild figs, and thought to rarely forage far from its roost (3). Like many fruit bats, this species is also suspected to feed on a variety of other local fruits and possibly insects as well (2).
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Comprehensive Description

Description

First described in 1984, the peculiar features of this species make it one of the strangest and intriguing of all known bats (4). One of the most bizarre and distinctive features is its separate tubular nostrils, which are about 6 mm long and project outwards above the mouth, and give this bat its common name (2) (3) (4). This species is also one of the few striped bats in the world, bearing one broad dark stripe down the centre of its back. There are also unusual yellow spots on the ears and wings (2) (4). The fur is soft and a pale golden brown to buff colour in females, and a darker, more chocolaty brown in males (2).
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Distribution

Range Description

The tube-nosed fruit bat is endemic to the Philippines, where it is restricted to the islands of Cebu (Vinciguerra and Muller 1993), Negros and Sibuyan; it might also occur in Panay, although there has been a lack of sampling there to confirm this (L. Heaney pers. comm. 2006). It has also been recorded from Karakelong in the Talaud Islands (Indonesia), and on Siao and Greater Sangihe in the Sangihe Islands (Indonesia) (K. Helgen pers. comm.), but these records represent tentative identifications. The elevational range is from sea level to 1,300 m asl. On Negros, it has been recorded from 200 to 1,300 m asl.
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Geographic Range

Nyctimene rabori is found on Negros, Cebu, and Sibuyan Islands, in the central Philippines.

Biogeographic Regions: oriental (Native )

Other Geographic Terms: island endemic

  • Heaney, L., et. al.. 2002. "Nyctimene rabori" (On-line). A Synopsis of the Mammalian Fauna of the Phillippine Islands. Accessed August 18, 2004 at http://www.fmnh.org/philippine_mammals/Nyctimene_rabori.htm.
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Range

As its common name suggests, the Philippine tube-nosed bat is endemic to the Philippines, where it is recorded only from the islands of Cebu, Negros and Sibuyan (4). The species has an extremely restricted range on these islands, having only once been seen on Cebu over 10 years ago, and with only a small population surviving in the hills of Sibuyan. The largest population exists on Negros Island, but is now limited to the relatively narrow strips of forest on the mountainside (3).
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Physical Description

Morphology

Physical Description

The striking physical features from which this animal gets its name are its tubular nostrils, which are separate and are about 6mm long. Body coloration is sexually dimorphic, with females being a light golden brown or buff color, and males a darker, more chocolatey brown. Both sexes have a dark stripe extending from the shoulders to the tail and light spots on their ears and wings. The bats measure about 142 mm in total length, with tail 25 mm, ear 20 mm and forearm 76 mm.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
It is found in or adjacent to forest (sea level to 1,300 m), in both primary and secondary forest (Vinciguerra and Muller 1993). N. rabori was previously thought to be confined to high-quality forest, but it is tolerant to a wider range of habitats than previously suspected, having been recorded from degraded habitats on Negros, and persisting in very degraded habitats on Cebu. During recent collections, the species has tended to be found near bodies of water.

Systems
  • Terrestrial
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Habitat

Nyctimene rabori is found only in tropical, forested areas, and probably mainly utilizes the high canopy.

Habitat Regions: tropical ; terrestrial

Terrestrial Biomes: rainforest

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Habitat

This bat is almost always found in primary, preferably lowland forest, but has also been recorded in lightly disturbed secondary forest (5). Known breeding populations tend to occur in only very narrow bands of forest near the tops of ridges and on the sides of tall mountains (3). Although recorded from 200 to 1,300 m on Negros Island (5), the lower limit is probably now about 800 – 900 m and rising as deforestation continues (3), but the species is found near sea level on Sibuyan (5). This bat roosts either in vegetation or large hollow trees in the forest, but never in caves (3).
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Trophic Strategy

Food Habits

Little is yet known about the habits of this recently (1984) described species, but, like other Nyctimene species, it probably eats a variety of local fruits and perhaps some insects as well.

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Life History and Behavior

Reproduction

Reproduction

Reproduction is known to occur in May and June, based on a small number of specimens that were collected while lactating (females) or in breeding condition (males). The duration of the breeding season and other details of the species' reproductive behavior have not yet been studied by researchers.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
EN
Endangered

Red List Criteria
C2a(i)

Version
3.1

Year Assessed
2008

Assessor/s
Ong, P., Rosell-Ambal, G. & Tabaranza, B. & Heaney, L., Ingle, N., Cariño, A.B., Pangulatan, L.M., Pedregosa, M., Alcala, E. & Helgen, K.

Reviewer/s
Hutson, A.M., Racey, P.A. (Chiroptera Red List Authority) & Stuart, S.N. (Global Mammal Assessment Team)

Contributor/s

Justification
N. rabori is listed as Endangered because its population size is estimated to number fewer than 2,500 mature individuals, there is an observed continuing decline in the number of mature individuals, and no subpopulation contains more than 250 mature individuals.

History
  • 1996
    Critically Endangered
    (Baillie and Groombridge 1996)
  • 1994
    Endangered
    (Groombridge 1994)
  • 1990
    Endangered
    (IUCN 1990)
  • 1988
    Endangered
    (IUCN Conservation Monitoring Centre 1988)
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Conservation Status

Human activities have resulted in the loss of much of this tube-nosed fruit bat's forest habitat. If the forest fragments where it still lives are adequately protected, the species may survive.

IUCN Red List of Threatened Species: endangered

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Status

Classified as Endangered (EN) on the IUCN Red List (1).
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Population

Population
The tube-nosed fruit bat has been collected (mist-netted) infrequently on Cebu and Negros. It might be less common in degraded habitat than in old growth forest, but it does seem to be able to persist in degraded areas (L. Heaney pers. comm. 2007). It is more widespread on Negros and Cebu than previously suspected (L. Heaney pers. comm. 2007). On Negros, where it had been known only from a population on the southern part of the island, surveys have located 30 individuals at eight sites between 1998 and 2004 (Carino 2004). During survey, the highest number of individuals of N. rabori was recorded in Ban-ban, Ayungon municipality, with a total capture of nine individuals during 26 Mar to 10 Apr 1999 (Cariño 2004). Mount Siburan (Sibuyan Island) may have numbers of the tube-nosed fruit bats in the high hundreds, Negros may have low thousands of individuals and Cebu may have numbers in the low hundreds, where the population of that island has been found only in five small sites (L. Heaney pers. comm. 2007). The number of mature individuals could be less than 2,500.

Population Trend
Decreasing
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Threats

Threats

Major Threats
Deforestation is a major threat, and has been severe across much of the range of N. rabori, although the rate has slowed due to the fact that there is little remaining primary forest. Most of the lowland forest habitat, which is the most suitable for the species, has been destroyed in two out of the three islands on which the species is known to occur. Although it has recently been recorded from some areas of secondary forest, the remaining populations are under intense pressure since very little forest remains and there is a continuing decline in area and quality of this forest. Hunting is not suspected to be a threat as, according to surveys, local people are unfamiliar with this tube-nosed fruit bat.
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Threats

Populations of this unusual-looking bat have declined dramatically since 1950 due to extensive habitat destruction, and the threat of extinction now lingers dangerously close (5). Habitat has been destroyed by clearing and illegal logging, leaving less than just 1 % of original old-growth lowland forest remaining on Negros Island, where the largest population of this species is found (3). Lowland rainforest on Cebu Island is virtually gone altogether, and it is not known if this species still survives there, as it has not been seen for over 10 years. Thus, the Philippine tube-nosed bat now clings to a precarious existence, edging slowly closer to extinction as illegal logging and clearing continue to reduce vital habitat ever further (4).
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Management

Conservation Actions

Conservation Actions
Surveys are needed over a wider part of the potential range of N. rabori to more acurately determine the status of its population, and to determine whether it occurs on Panay. It is known to occur in North Negros Forest Reserve (Tamblyn et al. 2005). More adequate conservation measures are needed at known sites.
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Conservation

Both Mount Canlaon and a part of the mountainous southern fragment where this bat is thought to occur on Negros Island are designated by the national government as protected areas. Nevertheless, deforestation continues to pose a serious threat, including in the beautiful Twin Lakes Region that falls within the southern 'protected area' (6). If the remaining forest fragments were adequately protected, this rare and intriguing species may have a chance of survival (2), but if current rates of habitat loss continue, the future for this bat looks pretty bleak.
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Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Positive

Tube-nosed fruit bats are dispersers of fruit tree seeds, and may help control pest insect populations.

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Wikipedia

Philippine Tube-nosed Fruit Bat

The Philippine Tube-nosed Fruit Bat (Nyctimene rabori) is a species of megabat in the Pteropodidae family. It is endemic to the Philippines. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss.

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