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Barau's Petrel Pterodroma baraui
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Justification
This species may have undergone a rapid population decline owing to illegal shooting in the 1990s, but has apparently recovered. However, it has a very small range when breeding (probably at fewer than five locations) and a small population, both of which are thought to be declining. It is therefore classified as Endangered.

Taxonomic source(s)
Brooke, M. De L. 2004. Albatrosses and petrels across the world. Oxford University Press, Oxford.
Christidis, L.; Boles, W. E. 1994. The taxonomy and species of birds of Australia and its territories. Royal Australasian Ornithologists' Union, Melbourne.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Identification
38 cm. Medium-sized, grey-and-white gadfly petrel. White forehead, black cap merging to greyish-brown back and upperwing. Paler wing-tips give scaled appearance. Slightly darker tail. Moderately defined "M" mark across wings. White chin, throat and rest of underparts, except for some grey mottling on sides of breast and flanks. White underwing with dark trailing edge, dark tip, narrow black edge to leading edge distal to carpal joint. Black thickens at joint. Then clear black bar extending from joint towards centre of wing. Similar spp. Capped appearance, white underparts, and distinctive underwing separate this from any other Indian Ocean Pterodroma.

Distribution and population
Pterodroma baraui nests on the Massif of Piton des Neiges, Réunion (to France) and has been discovered breeding on Rodriguez (Van den Berg et al. 1991). It has been observed at sea north of Réunion, from the Oman Sea as far as Sumatra and around the Cocos Keeling Islands, and south-east towards Australia (Barré et al. 1996), as far as about 200 km south and 600 km east of Réunion (Van den Berg et al. 1991). Recent tracking data indicate they can travel much greater distances, migrating eastward up to 5,000 km from their breeding colony to the central and eastern Indian Ocean (Pinet et al. 2011).

Population justification
In 1987, the population was estimated at 3,000 breeding pairs based on colony and coastal counts, and 15,000 individuals based on transects at sea. In 1992, it was estimated that up to half the breeding population may have been killed by illegal shooting. Although this may have been an overestimate, the population appears to have recovered to former levels (because of large numbers of non-breeders) following the cessation of shooting (V. Bretagnolle in litt. 1999). More recently, improved knowledge of the colonies indicates that 4,000-5,000 pairs may be a more accurate estimate of breeding numbers, although this could be optimistic (V. Bretagnolle in litt. 2007). In 2001, based on the discovery of new breeding colonies, 4,000 to 6,500 breeding pairs spread over 10 colonies was estimated. The most reliable recent estimate available is that of 3,000-4,000 pairs given by V. Bretagnolle (in litt. 2007). This equates to 6,000-8,000 mature individuals, or roughly 9,000-12,000 individuals in total.

Trend justification
The species is suspected to be undergoing a long-term decline in line with increased juvenile mortality caused by disorientation resulting from light pollution; predation by introduced species is also likely be a significant factor.

Ecology
It nests on cliff-ledges in volcanic ash soils beneath sparse, heathy vegetation such as Philippia montana associated with upland elfin forest (Probst et al. 2000). It fishes over a wide area, sometimes associated with flocks of feeding seabirds, and occasionally near fishing boats (Barré et al. 1996, Probst et al. 2000). A study of grounded birds in 2005 suggested that most juveniles left their colonies over a period of eight days, beginning four days after the new moon in early April (Fontaine 2005a).  During the non-breeding season, it forages in regions characterised by warm sea surface temperatures and low productivity, consistent with strong and reliable easterly winds, between the western South Equatorial Current and the eastern Equatorial Counter Current (Pinet et al. 2011). Birds leave the colony late March, reaching wintering areas in mid-April, returning to the colony 5-15 September (Pinet et al. 2011). Both sexes, and breeders and non-breeders, show similar migration schedules, with males returning to the colony slightly earlier, and mean return dates coinciding with full moon phase, suggesting that birds use this cue to synchronise their activity (Pinet et al. 2011). Mean distances travelled per day on route to wintering areas was 110-600 km, once there this dropped significantly (Pinet et al. 2011). There is considerable consistency in wintering areas year on year (Pinet et al. 2011). It feeds at the surface, taking mostly squid and fish, foraging alone or in small flocks, often associating with sooty terns Sterna fuscata and Audubon shearwaters Puffinus lherminieri. Stable isotope data suggest that young and adults consume different prey (Pinet et al. 2009).

Threats
Cats predate adults and fledglings and rats may predate chicks and eggs, although no attempt has been made to quantify this due to the very rough topography (M. Le Corre in litt. 1999, V. Bretagnolle in litt. 2007). Rats and/or cats and/or goats have been noted at all visited colonies (V. Bretagnolle in litt. 1999). In 2005, the remains of birds predated by rats and cats were found at a colony at 2,500 m, and cats were judged to be the main culprits (Fontaine 2005b). Similar findings were reported in 2009, where 58% of the birds killed by cats were adults and 42% were fledglings (Faulquier et al. 2009). The presence of only a few cats may pose a major threat to this species, due to the loss of adult birds rather than chicks and eggs (which is the major threat posed by rats) (Pinet et al. 2009). Thus if cat control led to an increase in rat density it may not lead to a decline in the petrel population (although further work on this is necessary) (Pinet et al. 2009).
Juveniles are attracted by lights in urban areas, where some die of starvation or are taken by cats and dogs (Le Corre et al. 1996, Le Corre et al. 1999). Light-induced mortality of the juveniles of this rare petrel is a considerable problem likely to affect the species long term populations dynamics. Widespread light pollution such as street lamps and sport installations are responsible for the greatest majority of petrel light-induced mortality on Réunion (Le Corre et al. 2002). It has been suggested perhaps as many as 40-60% of young birds are disorientated and ultimately suffer light-induced mortality each year (Le Corre 1999, Le Corre et al. 2002). Mountaineering is becoming a popular sport and could be a potential threat (Probst et al. 2000). The species is potentially threatened by climate change because it has a geographically bounded distribution: its altitudinal distribution falls entirely within 1,000 m of the highest mountain top within its range (3069 m).
Population modelling has indicated that these threats (especially those reducing adult survival such as cat predation) may drive the species to extinction (Pinet et al. 2011).


Conservation Actions Underway
The local authorities have taken steps to stop shooting (Bretagnolle and Attié 1993, Thiollay 1996, M. Le Corre in litt. 1999). Since 1996, there has been a campaign to quantify urban light-induced mortality and to rescue as many birds as possible, with increasing success in finding and rescuing birds: over 604 in 1999 (Le Corre et al. 2002), 787 in 2001 (Ghestemme 2001); around 90% are successfully released (Le Corre et al. 1996, Le Corre et al. 1999, M. Le Corre in litt. 1999, Le Corre et al. 2002). In 2005, only 252 grounded birds were found and rescued, perhaps owing to poor food availability, predation at colonies, a global decline in numbers or weather conditions that favoured flights at higher altitudes (Fontaine 2005a). Measures to reduce light pollution, especially during the April fledging, have been proposed (Le Corre et al. 2002). Since 2004, the community of Cilaos, close to the species's colonies, has taken part in efforts to reduce lighting, and there has been a corresponding decrease in the numbers of grounded birds (Fontaine 2005a). The breeding colonies will be classified as a protected area with access authorised for conservation and research purposes only (Probst et al. 2000). The trapping of rats is taking place at P. baraui colonies in an effort to study their population size and diet, and to gather knowledge in preparation for their control (Fontaine 2005b). Conservation Actions Proposed
Carry out surveys to obtain an up-to-date population estimate. Conduct regular surveys to monitor population trends. Control predators, particularly cats, at breeding colonies (V. Bretagnolle in litt. 1999, V. Bretagnolle in litt. 2007). Cat control at breeding colonies is required year-round, particularly during the non-breeding season when efforts are likely to have the most effect due to the reduction of other available prey (Pinet et al. 2009). Legislative change is first required to allow the control of feral cats, as these are currently protected alongside domestic cats under French legislation (Pinet et al. 2009). Instigate a comprehensive education program to demonstrate the impact of feral cats to the local population (Pinet et al. 2009). Ensure that a protected area is declared as soon as possible to include all colonies (Pinet et al. 2009). Continue rescue programme of young birds attracted by lights (Le Corre et al. 2002). Investigate light-reduction programmes either through light-shielding or light-restriction during April and May (M. Le Corre in litt. 1999, Le Corre et al. 2002), and consider adjusting its direction, intensity and colour, and the use of temporary black-outs (Salamolard et al. 2007).

Related state of the world's birds case studies

References
Barré, N.; Barau, A.; Jouanin, C. 1996. Oiseaux de la Réunion. Les Éditions du Pacifique, Paris.

Bretagnolle, V.; Attié, C. 1991. Status of Barau's Petrel (Pterodroma baraui): colony sites, breeding population and taxonomic affinities. Colonial Waterbirds 14: 25-33.

Bretagnolle, V.; Attié, C. 1993. Massacre d'une espèce protegéé sur le territoire français: le petrel de Barau. Courrier de la Nature 138: 40.

Faulquier, L.; Fontaine, R.; Vidal, E.; Salamolard, M.; Le Corre, M. 2009. Feral cats Felis catus threaten the endangered Barau's Petrel Pterodroma baraui at Reunion Island (Western Indian Ocean). Waterbirds 32(2): 330-336.

Fontaine, W. 2005. Bilan du sauvetage des Petrels de Barau - Avril 2005. Le Chakouat 14.

Fontaine, W. 2005. Mission sur la colonie des Pétrels de Barau - Mars 2005. Le Chakouat 14.

Fry, C. H.; Keith, S. 2000. The birds of Africa vol. VI. Academic Press, London.

Ghestemme, T. 2001. Opération de sauvetage de pétrels de Barau 2001. Lettre d'information: 3-4.

Le Corre, M.; Ollivier, A.; Ribes, S.; Jouventin, P. 2002. Light-induced mortality of petrels: a 4-year study from Réunion Island (Indian Ocean). Biological Conservation 105: 93-102.

Le Corre, M.; Probst, J.-M.; Viviés, Y.-M. D.; Ribes, S. 1996. Opération de sauvetage réussie pour les jeunes Pétrels de Barau à l'envol. Courrier de la Nature 160: 12-13.

Le Corre, M.; Viviès, Y.-M. D.; Ribes, S. 1999. Les pétrels de La Réunion en danger. L'Oiseau Magazine 54: 26-27.

Pinet, P.; Jaquemet, S.; Pinaud, D.; Weimerskirch, H.; Phillips, R. A.; Le Corre, M. 2011. Migration, wintering distribution and habitat use of an endangered tropical seabird, Barau's Petrel Pterodroma baraui. Marine Ecology Progress Series 423: 291-302.

Pinet, P.; Salamolard, M.; Probst, J.-M.; Russell, J. C.; Jaquemet, S.; Le Corre, M. 2009. Barau's Petrel Pterodroma baraui: History, biology and conservation of an endangered endemic petrel. Marine Ornithology 37(2): 107-113.

Probst, J.-M.; Colas, P.; Douris, H. 1995. Premières photos d'un site de nidification du pétrel de Barau à l'île de La Réunion. Courrier de la Nature 150: 16.

Probst, J.-M.; Le Corre, M.; Thébaud, C. 2000. Breeding habitat and conservation priorities of Pterodroma baraui, an endangered gadfly petrel of the Mascarene archipelago. Biological Conservation 93: 135-138.

Salamolard, M.; Ghestemme, T.; Couzi, F-X.; Minatchy, N.; Le Corre, M. 2007. Impacts des éclairages urbains sur les Pétrels de Barau, Pterodroma baraui sur l'Ile de la Réunion et mesures pour réduire ces impacts. Ostrich 78(2): 449-452.

Stahl, J.-C.; Bartle, J. A. 1991. Distribution, adundance and aspects of the pelagic ecology of Barau's petrel Pterodroma baraui in the south-west Indian Ocean. Notornis 38: 211-226.

Thiollay, J.-M. 1996. Oiseaux de la Réunion: vers une necessaire union des efforts de tous les ornithologues? Courrier de la Nature: 4.

Text account compilers
Anderson, O., Benstead, P., Calvert, R., Ekstrom, J., Shutes, S., Stattersfield, A., Taylor, J., Temple, H.

Contributors
Attié, C., Bretagnolle, V., Gee, B., Le Corre, M.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Pterodroma baraui. Downloaded from http://www.birdlife.org on 23/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/04/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Barau’s petrel (Pterodroma baraui)

Key facts
Current IUCN Red List category Endangered
Family Procellariidae (Petrels and shearwaters)
Species name author (Jouanin, 1964)
Population size 6000-8000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 16,000,000 km2
Country endemic? Yes
Links to further information
- Additional Information on this species