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Status and Conservation of the Seychelles Sheath-Tailed Bat Coleura Seychellensis on Silhouette Island, Seychelles

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Status and Conservation of the Seychelles Sheath-Tailed Bat Coleura Seychellensis on Silhouette Island, Seychelles Preprint, 2008 ENDANGERED SPECIES RESEARCH Published online November 24, 2008 doi: 10.3354/esr00151 Endang Species Res Contribution to the Theme Section ‘Bats: status, threats and conservation successes’ OPENPEN ACCESSCCESS Conservation of the Seychelles sheath-tailed bat Coleura seychellensis on Silhouette Island, Seychelles Justin Gerlach* Nature Protection Trust of Seychelles, 133 Cherry Hinton Road, Cambridge CB1 7BX, UK ABSTRACT: The critically endangered Seychelles sheath-tailed bat Coleura seychellensis on Silhou- ette Island has been studied since 1997. The species occupies small caves in boulder fields in lowland woodland. Lepidoptera and Coleoptera dominate the diet, with a strong preference for the latter before and during the breeding season (November to April). Foraging areas change seasonally according to wind direction, and foraging occurs in gaps in the woodland. Mature native woodland is favoured due to the abundance of Coleoptera in this habitat. Habitat management on Silhouette has removed alien plants from around the roosts and improved foraging conditions for the bat. This has been accompanied by increases in foraging activity in managed areas and an increase in breeding activity. The population at La Passe on Silhouette has increased from 14 to 25 ind. in the 1990s to 32 in 2008. The management approach is to be extended to another area of Silhouette where bats have been located and should also be used on Mahé. Increases in human development activity on Mahé and Silhouette may threaten population recovery of this bat, and legal controls on development in appropriate habitat are urgently needed. With effective legal controls and intensive habitat manage- ment recovery of this species is possible. KEY WORDS: Conservation · Emballonuridae · Habitat · Population · Restoration Resale or republication not permitted without written consent of the publisher INTRODUCTION under Seychelles law, although the Aldabran ende- mics (P. aldabrensis, C. pusilla and Triaenops sp.) are Recent assessments of the status of mammals have all protected by virtue of being restricted to a special concluded that bats face particularly high levels of reserve. The Seychelles sheath-tailed bat was de- threat (Mickleburg et al. 2002). Levels of extinction are scribed in 1868 (Peters 1868), but no ecological re- low compared to those of many other taxa, but this may search on the species was published until 1982 (Nicoll reflect limited research on most bat species. The bats & Suttie 1982). Since 2004 there has been a substantial of the Seychelles Islands are characteristic of the group increase in research activity on the species (Burgess & in this regard, comprising 1 abundant and relatively Lee 2004, Gerlach 2004, in press a,b, Joubert 2004, well-known endemic species (Pteropus seychellensis), Rocamora & Joubert 2004, Bambini et al. 2006, Gerlach 1 ‘vulnerable’, largely unstudied, but regularly re- & Taylor 2006). corded endemic species (Pteropus aldabrensis), The Seychelles sheath-tailed bat has been recorded 1 widespread, but under-recorded species (Taphozous from 5 islands (Mahé, Silhouette, Praslin, La Digue and mauritianus), 2 very poorly known endemics (Chaere- Marianne, with isolated records from the Amirantes phon pusilla and Triaenops sp.) and the ‘critically and Zanzibar; Goodman et al. 2008), but is now endangered’ Seychelles sheath-tailed bat Coleura restricted to 4 sites on 2 islands. The species was first seychellensis. The conservation status assessments recorded on Mahé Island, where it is now restricted to ‘vulnerable’ and ‘critically endangered’ are those used 3 roosts, 2 in the Port Launay–Baie Ternay area with by the International Union for the Conservation of some 27 ind. (Bambini 2008) and 1 at Anse Major of Nature (IUCN 2007). No bat species are protected only 1 or 2 ind. (P. Senior pers. comm.). The larger of *Email: [email protected] © Inter-Research 2008 · www.int-res.com 2 Endang Species Res: Preprint, 2008 the roosts is adjacent to a recently approved hotel development, which is expected to have a large impact on the population. On Silhouette Island, 2 separate populations are known, one may be restricted to a few individuals, the other numbers 32 ind. as of March 2008. This population has been the focus of intensive research and conservation management efforts since 1997, which are described here. MATERIALS AND METHODS Population size. The La Passe roost of Coleura sey- chellensis on Silhouette Island has been monitored since 1997. Installation of roost CCTV in 2006 has allowed frequent and accurate counts. All other identi- fied roost sites on this island have been visited at least once a year since 2005 (Grande Barbe in March/April and December every year and Pointe Etienne in March/April) and searched for signs of recent occu- pancy — the presence of bats or of recent guano. Guano was categorized as fresh (not completely dry), Fig. 1. Coleura seychellensis. Granitic islands of the Sey- recent (deposited since the previous visit), or old. No chelles showing localities mentioned in the text. d: occupied roosts; S: historical roosts; d: occasional roosts. Inset: bats have been found in these roosts although occa- Silhouette Island with 100 m contours shown sional small quantities of fresh guano have been located; consequently, population estimation is only possible for the La Passe roost. 1. Rest: hanging by hind limbs only, not moving Distribution and characteristics of roosts and forag- 2. Groom: scratching and licking of body and/or wings ing habitat. Searches of boulder fields have been made 3. Stretch: wings expanded whilst remaining on the in all coastal areas. There are historical records of roost ceiling roosts at La Passe, Anse Lascars, Anse Mondon, 4. Alert: all 4 limbs in contact with roost ceiling, a Grande Barbe and Pointe Etienne (Fig. 1). All these distinctive posture were investigated. 5. Argue: agonistic interaction between 2 or more Foraging habitat was investigated using automated bats bat detectors (Anabat II system); these were placed in 6. Move: walking over the roost ceiling clearings in woodland or on rocks overlooking the 7. Fly: visible flight in the roost canopy or potential flyways. The bat detectors were set Recordings of vocalizations in the roost were made to record between the hours of 18:00 and 06:00. In the quarterly using the automated bat detector. This pro- feeding area identified at La Passe, 7 regular monitor- vided data on individual calls (Gerlach in press b). ing points were established in 2007, 3 of these had Reproductive biology. Breeding cycle: The breed- been surveyed in 2006, providing between 1 and 2 yr ing cycle was inferred from the numbers of females of monitoring data. An additional 6 sites were used breeding in each season and the levels of male ‘song’ occasionally. recorded. Male ‘songs’ are stereotyped calls in the The main foraging areas identified by this study form of complex short FM-tones that are variable in the were mapped using global positioning system (GPS) degree of development of the initial upsweep of each data and topographical features. Food availability was call, the characteristic frequency and duration (Ger- investigated by maintaining a malaise trap in the for- lach in press b). By synchronising call recordings and aging habitat. This was emptied every 2 wk for a 12 mo the CCTV footage (Gerlach in press b), it has been pos- period. sible to demonstrate that distinct calls are produced by Behaviour within the roost. Behaviour in the roost different individuals, allowing different males to be was recorded by examination of recorded footage from discriminated, as has been reported for other embal- the La Passe CCTV system. The number of bats in the lonurid bats (Davidson & Wilkinson 2004). roost and the number engaged in defined behaviours Juvenile growth: Still images showing juveniles next was noted every 15 min for 4 d (24 h periods) each to adults were recorded from the CCTV weekly. Mea- month. Behaviours were defined as: surements were made of still images taken from Gerlach: Coleura seychellensis status and conservation 3 footage of both adults and juveniles, providing a been established (Allophyllus seychellensis and weekly range of relative sizes. This provides an Gynura seychellensis). This habitat restoration has approximate growth pattern for the time between been carried out by the Nature Protection Trust of small juveniles being left in the roost and their becom- Seychelles (NPTS), with occasional assistance from ing indistinguishable from adult bats. Inevitably these volunteers and visiting field courses. Since January measurements are approximate, but may provide a 2008, labour has been provided by the Labriz Hotel, reliable indication of growth patterns as they were all Silhouette. taken from a visual area corresponding to a 15 × 15 cm area of roost ceiling and all measurements were made when bats were hanging at rest vertically. It was RESULTS impossible to identify individual bats visually, and these measurements represent the growth of a cohort Population size of juveniles rather than individual growth. Conservation. Conservation action comprised 2 main The La Passe population of Coleura seychellensis aspects: roost protection and habitat management. has grown since 2001, reaching 32 ind. by the end of Threats to the roost have been addressed when they 2003. There was a decline from 2005 to 2007, but num- arise; these have included smoke from the La Passe bers increased again towards the end of 2007 (Fig. 2). settlement, rubbish dumping, increases in alien mam- Monitoring data indicate a semi-regular pattern of mal populations and insecticide use. population decline in the second quarter of the year Early research on roost characterization indicated (80% of years) and increase in the fourth quarter that the major problem facing the bats was habitat (75%). The first quarter shows little change (changes deterioration. Accordingly, habitat management was in only 20% of years), and the third quarter is equally carried out around the roost and in the foraging area.
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