Lesser brown horseshoe bat (Rhinolophus stheno)

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Lesser brown horseshoe bat with mite
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Lesser brown horseshoe bat fact file

Lesser brown horseshoe bat description

KingdomAnimalia
PhylumChordata
ClassMammalia
OrderChiroptera
FamilyRhinolophidae
GenusRhinolophus (1)

As a medium-sized member of the horseshoe bat family, this species is characterised by its complex noseleaf. The noseleaf consists of a broad, flat horseshoe-shaped area over the nostrils, a horn-like projection above, and a shorter, rounded projection in between. The function of the noseleaf is to emit echolocation calls for orientation and hunting. The ears are large and black, and the eyes extremely small, dwarfed by the noseleaf. The natural fur colour is dark brown, but this bat’s habit of roosting in caves can lead to chemical bleaching, leaving the fur orange (2).

Size
Head-body length: 44 - 56 mm (2)
Tail length: 17 - 20 mm (2)
Forearm length: 43 - 49 mm (2)
Weight
5.5 - 11 g (2)
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Lesser brown horseshoe bat biology

This species feeds on insects, hunting at night using echolocation to locate prey items and move amongst the dense jungle vegetation. It calls at a constant ultrasonic frequency of 86 kHz, enabling it to detect the flutter of an insect’s wings (2).

In Peninsular Malaysia, the majority of pregnant females of the lesser brown horseshoe bat have been found between February and April, and are with young pups between May and July. A single pup is born to each female, who cares for it for up to a year. At birth it weighs a massive one quarter of its mother’s weight, and she may continue to carry it on feeding flights for two months (2).

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Lesser brown horseshoe bat range

The lesser brown horseshoe bat is found in Thailand, Peninsular Malaysia, Sumatra, Java (3), Vietnam (4), Burma (5) and Laos (2).

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Lesser brown horseshoe bat habitat

The lesser brown horseshoe bat is found in primary rainforest, where it feeds at all levels beneath the lower canopy. It roosts in large numbers in caves and in smaller numbers in cracks between rocks. It is often found roosting with its close relative, Blyth’s horseshoe bat (Rhinolophus lepidus) (2).

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Lesser brown horseshoe bat status

Classified as Least Concern (LC) on the IUCN Red List (1).

IUCN Red List species status – Least Concern

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Lesser brown horseshoe bat threats

The main threat to local lesser brown horseshoe bat populations is the disturbance of cave roosts, caused by mining activities or the collection of guano and bird nests. A wider threat, relevant to most bat species in Southeast Asia, is from habitat loss. The rapid increase in land devoted to commodity agriculture (such as cocoa, coffee, oil palm, rice and rubber) has resulted in extensive loss of forest in the last 20 years. In recent years, one of the largest agricultural drivers of deforestation in Malaysia, Sumatra and Thailand has been oil palm. Together, Malaysia and Indonesia export 88 percent of the world’s palm oil, for use in products such as margarine, lipstick and detergent. In addition, despite the contribution of many bats in the control of insect crop pests, persecution of bats is also a threat (6) (7).

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Lesser brown horseshoe bat conservation

Deforestation for agriculture, particularly for oil palm plantations in recent years in Malaysia, Indonesia and Thailand, is an issue of major concern for many forest-dwelling species, even within so-called protected areas. Regarding oil palm, some companies and large retailers have agreed to source palm oil from sustainable sources via a certification process developed by the Roundtable for Sustainable Palm Oil. The principal criterion relevant to biodiversity is that new plantations have not been established on land of High Conservation Value (6). Many scientific and charitable groups contribute to bat monitoring and local education programmes that can help to reduce persecution and raise awareness of the natural assets of the land (8).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For further information on palm oil see:

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Authentication

Authenticated (03/10/08) by Matt Struebig, Queen Mary University of London.
http://webspace.qmul.ac.uk/mstruebig

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Glossary

Echolocation
Detecting objects by reflected sound. Used for orientation and detecting and locating prey by bats and cetacea (whales and dolphins).
Primary forest
Forest that has remained undisturbed for a long time and has reached a mature condition.
Ultrasound
Sounds that are above the range of human hearing.
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References

  1. IUCN Red List (June, 2009)
    http://www.iucnredlist.org
  2. Kingston, T., Liat, L.B. and Akbar, Z. (2006) Bats of Krau Wildlife Reserve. Penerbit UKM, Bangi.
  3. Corbet, G.B. and Hill, J.E. (1992) The Mammals of the Indomalayan Region: a systematic review. Oxford University Press, Oxford.
  4. Csorba, G. and Jenkins, P.D. (1998) First records and a new subspecies of Rhinolophus stheno from Vietnam. Bulletin of the Natural History Museum of London – Zoology, 64(2): 207 - 211.
  5. Bates, P.J.J., Thi, M.M., New, T., Bu, S.S.H., Mie, K.M., Nyo, N., Khaing, A.A., Aye, N.N., Oo, T. and MacKie, I. (2004) A review of Rhinolophus from Myanmar, including species new to the country. Acta Chiropterologica, 6(1): 23 - 48.
  6. Roundtable for Sustainable Palm Oil (September, 2008)
    http://www.rspo.org
  7. Struebig, M. (2008) Pers. comm.
  8. Maltby, A. (2005) Pers. comm.
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Image credit

Lesser brown horseshoe bat with mite  
Lesser brown horseshoe bat with mite

© Alanna Collen

Alanna Collen
alanna.collen@gmail.com

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