Greater horseshoe bat
| Greater Horseshoe Bat | |
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| Species: | R. ferrumequinum
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| Binomial name | |
| Rhinolophus ferrumequinum (Schreber, 1774)
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| Greater Horseshoe Bat range | |
The Greater Horseshoe Bat (Rhinolophus ferrumequinum) is a European bat of the Rhinolophus genus. Its distribution covers Europe, Africa, South Asia and Australia.[2] It is the largest of the European Horseshoe Bats and is thus easily distinguished from other species. The species is sedentary, travelling between 20 and 30 km between the winter and summer roosts, with the longest recorded movement being 180 km. The species is notable as having the oldest recorded age for any European bat, with a bat living for over 30 years. The frequencies used by this bat species for echolocation lie between 69–83 kHz, have most energy at 81 kHz and have an average duration of 37.4 ms.[3][4]
Description
The greater horseshoe bat is the largest bat in Europe.[5] It has a distinctive noseleaf, which has a pointed upper part and a horseshoe shaped lower part.[6] Its horseshoe noseleaf helps to focus the ultrasound it uses to 'see'. The greater horseshoe bat also has tooth and bone structures that are distinct from that of other rhinolophids. Its first premolar on the upper jaw protrudes from the row of teeth.[7] For other horseshoe bats, this premolar is very small or non-existent.[7] Also in comparison to its relatives, the greater horseshoe bat has relatively short third and fourth metacarpal bones in its wings.[8] It also lacks a tragus. The Greater Horseshoe Bat is on average between 57 and 71 mm long, with a 35–43 mm tail and a 350–400 mm wingspan. [7] The fur of the species is soft and fluffy, with the base of hairs being light grey, the dorsal side hair grey brown and the ventral side grey-white, with juvenile bats having more of an ash-grey tint to their fur. Wing membranes and ears are light grey-brown. It weighs up to 30 grams.[9]
Distribution
The greater horseshoe bat ranges from North Africa and southern Europe through south-west Asia, the Caucasus, Iran, Afghanistan, Pakistan and the Himalayas to south-eastern China, Korea, and Japan.[10] Generally the bats lives below 800 m asl, but it also lives, depending on roost availability and humidity, 3,000 m asl in the Caucasus.[1]
Ecology and behavior
Habitat and roosting
Pastures, deciduous temperate woodland, Mediterranean and sub-mediterranean shrubland and woodlands are common foraging foraging habitats for this species.[1] In northern parts of its range, the horseshoe uses warm underground sites, both natural and artificial, as summer roosts as well as attics. Where the species occupies buildings, proximity to good foraging areas and underground sites for torpor at various times of year and for winter hibernation as well as the building's own features are important.[11]
Horseshoe bats hibernate in cold underground sites like large caves, during the winter. The bat require a certain temperature and humidity limit, but thus can vary with age, sex and condition.[1] Horseshoe bats are active throughout the year in the southern parts of their range. Horse bats commonly travel distances of 20-30 km between winter and summer roosts, with longest distance recorded being 180 km.[12] Horseshoes bats also live in montane forests among the mountains and valleys of the Himalaya in South Asia and roosts in caves, old temples, old and ruined buildings in tight clusters.[1]
Diet and hunting
The species feeds preferentially on lepidoptera (moths), making up around 41% of the diet[13] - in particular the noctuidae species [14], Coleoptera (beetles) constitute around 33% of the diet[13], of which dung beetles are often taken Aphodius rufipes is one such dung beetle forming an especially important part of its diet. Cow pats are part of its life cycle, acting as food source and habitat for the larvae. Up to 100 larvae can be found in a single cow pat. The beetle is most abundant in August when the young bats begin their first feeeding flights).[15] The remainder of the diet being hymenoptera and diptera.[13] Cockchafers also form an important part of its diet.
The feeding area from the maternity roost is typically of radius 4 km, as neither the lactating females or young can travel far. In late August and September the bats feed on cranefly, to fatten up before hibernation. Breeding females depend on beetles from April until June, and moths from June to August.
The Greater Horseshoe Bat leaves its roost at dusk, and its flying is made up of slow, fluttering travel with short glides, normally between 0.3 and 6 metres above the ground, with little hunting during wet and windy weather. It hunts in terrain with poor tree cover such as hillsides, cliff faces and in gardens, locating insects from its resting place and then intercepting them. The species has the ability to pick food up off the ground while still in flight, and indeed drinks during low-level flight or while hovering. The feeding range of colonies in England is between 8 and 16 kilometres.
Mating and reproduction
Female bats become sexually mature at the age of three years while males are sexually mature at two years. A female usually will not have her first young until her fifth year.[16] Most matings take place in the fall, however some occur in the spring.[17] After a mating, the male will secret a vaginal plug in the female’s vulva. This may be used to keep the sperm of other males out,[18] or to hold the sperm in for fertilzation. [17] Females tend to control fertilizations which take place later.[5] Females will raise their young in maternity roosts.[5] Each season, a female produces one offspring. Most young are born in June or July.[5] When they are seven days old, young can open their eyes and at their third or fourth week they can fly. Young can live the roost their seventh or eighth week.
Status and conservation
In general the greater horseshoe bat is list as Least Concern by the ICUN for because: "This species has a large range. Although there have been marked and well-documented declines in some areas, the species remains widespread, abundant, and apparently stable in other areas. Assessed as Least Concern".[1] However, the overall greater horseshoe bat population is declining.[1] They are largely uncommon in much of their range. Despite this, they appear to be abundant and widespread in at least parts of south-west Asia and the Caucasus least parts of south-west Asia and the Caucasus. Also in some northwest European countries, there appears to be some stabilisation and/or recovery.[11] Less is known about bat trends in other parts of Europe. It is extinct in Malta.[1] Fragmentation/isolation of habitats, change of management regime of deciduous forests and agricultural areas, loss of insects caused by pesticides, and disturbance and loss of underground habitats and attics are the major threats to the greater horseshoe bat. Deforestation, mostly caused by logging operations and the conversion of land for agricultural and other uses, threatens the species in South Asia.[19]
Status in Britain
The species is rare in Britain, confined to just a small number of sites. Its distribution can be found on the National Biodivesity website here. Its breeding sites include Brockley Hall Stables near Bristol, Iford Manor near Bath, and Littledean Hall in the Forest of Dean. Its winter hibernation sites include Banwell Caves and Compton Martin Ochre Mine in the Mendip Hills, Chilmark Quarries in Wiltshire, and Combe Down and Bathampton Down Mines near Bath. In Dorset, the species roosts at Bryanston, Creech Grange and in Belle Vue Quarry. The species also occurs at Berry Head in Devon and has a monitored roost site at Woodchester Mansion in Stroud.
The species has disappeared from over half of its former range within the United Kingdom, with about 1% of the population surviving. Like all horseshoe bats it is sensitive to disturbance, and is threatened by the use of insecticides and the elimination of beetles by the changing agricultural practices.
There are seventeen recorded species of bat in Britain as of recent survey results.The greater horseshoe bat is one of the rarest. There are currently 35 recognised maternity and all-year roosts and 369 hibernation sites. Current estimates range between 4000 and 6600 individuals. Greater Horseshoes have declined for numerous reasons ranging from the use of agrichemicals (Ivermectin in particular) to loss of habitat and redundancy of farming methods. Avermectin kills off insect larvae and thus a decrease in the abundance of food for the Horseshoes, causing them to travel further and face increased dangers.
Habitat loss is primarily the lack of established hedgerows and deciduous woodland-pasture ecotones. Modern farming methods have seen the reduction of cattle-grazing and this has impacted the Horseshoes who previously found that dung attracted insects and sustained entomogenous populations, giving their prey a stable population.
References
- ^ a b c d e f g h Template:IUCN2010
- ^ Maurice Burton, Robert Burton The international wildlife encyclopedia, Volume 9 Marshall Cavendish, 2002, ISBN 0761472665
- ^ Parsons, S. and Jones, G. (2000) 'Acoustic identification of twelve species of echolocating bat by discriminant function analysis and artificial neural networks.' J Exp Biol., 203: 2641–2656.
- ^ Obrist, M.K., Boesch, R. and Flückiger, P.F. (2004) 'Variability in echolocation call design of 26 Swiss bat species: Consequences, limits and options for automated field identification with a synergic pattern recognition approach.' Mammalia., 68 (4): 307–32.
- ^ a b c d Schober, W., E. Grimmberger. (1997) The Bats of Europe and North America. New Jersey: TFH Publications Inc.
- ^ Nowak, R. (1994) Walker's Bats of the World. Baltimore, Maryland: The Johns Hopkins University Press.
- ^ a b c greater horseshoe bat Animal Diversity Web
- ^ Koopman, K. 1994. Chiroptera: Systematics. New York: Walter de Gruyter.
- ^ Nature, English (1998). Managing Landscapes For The Greater Horseshoe Bat. Ruddocks (Lincoln) Ltd. ISBN 1 85716 416 4.
- ^ Csorba G. P., Ujhelyi P. and Thomas, N. 2003. Horseshoe Bats of the World. Alana Books, Shropshire, England.
- ^ a b Hutson A. M., Mickleburgh S. P. and Racey P. A. 2001. Microchiropteran Bats - Global Status Survey and Conservation Action Plan. IUCN/SSC Chiroptera Specialist Group, Gland, Switzerland and Cambridge, U.K.
- ^ de Paz, O., Fernández, R. and Benzal, J. 1986. " El annilamiento de qirópteros en el centro de la Península Ibérica durante el periodo 1977-1986 ". Central de Ecologia 30: 113-138.
- ^ a b c Jones, G. (1990), "Prey selection by the greater horsehoe bat (Rhinolophus ferrumequinum): Optimal foraging by echolocation?", Journal of Animal Ecology, 59: 587–602.
{{citation}}: CS1 maint: extra punctuation (link) - ^ Bat Conservation Trust Greater Horseshoe bat Species information leaflet
- ^ Wild Devon The Magazine of the Devon Wildlife Trust, page 14, Winter 2009 edition
- ^ Racey, P. 1982. "Ecology of Bat Reproduction". Pp. 57-93 in T. Kruz, ed. Ecology of Bats. New York: Plenum Press.
- ^ a b Rossiter, S., J. Jones, R. Ransome, E. Barratt. 2000. "Genetic variation and population structure in the endangered greater horseshoe bat Rhinolophus ferrmequinum". Molecular Ecology, 9: 1131-1135.
- ^ Fenton, M. 1994. Just Bats. Toronto: University of Toronto Press.
- ^ Molur, S., Marimuthu, G., Srinivasulu, C., Mistry, S. Hutson, A. M., Bates, P. J. J., Walker, S., Padmapriya, K. and Binupriya, A. R. 2002. Status of South Asian Chiroptera: Conservation Assessment and Management Plan (C.A.M.P.) Workshop Report. Zoo Outreach Organization/CBSG-South Asia, Coimbatore, India.
Further reading
- Schober, Wilfried (1989). Dr. Robert E. Stebbings (ed.). A Guide to Bats of Britain and Europe (1st ed.). UK: Hamlyn Publishing Group. ISBN 0-600-56424-x.
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