Evidence of a Dramatic Decline of the Red-Necked Ostrich Struthio Camelus
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Oryx Vol 35 No 4 October 2001 Short Communication Evidence of a dramatic decline of the red-necked ostrich Sttuthio camelus camelus in the AYr and Tenere National Nature Reserve, Niger Stephane Ostrowski, Mahaman Sani Massalatchi and Mamadou Mamane Abstract In 1990 the population of the red-necked have been severely persecuted during the civil war of ostrich Struthio camelus camelus in the Air and Tenere 1991-1997. Although a small population had remained National Nature Reserve, Niger, was estimated at c. 1600 in the protected area after the conflict, the occurrence of individuals. During a 14-day survey carried out in the further poaching suggests that remaining individuals protected area in October and November 2000 no are threatened with extirpation. evidence of recent occurrence of ostriches was found, and it appears that the population size has dramatically Keywords Air and Tenere reserve, Niger, poaching, declined in its favoured habitat. The species seems to red-necked ostrich, Struthio camelus camelus. On 22 January 1988 77,360 sq km of the Air mountains protected by law throughout their range (del Hoyo et al., and Tenere sand sea in Niger were gazetted by Minis- 1992). terial decree no. 88-019/PCMS/MAG/E as a National In the Sahara, ostriches have found refuge in the less Nature Reserve (Reserve Naturelle Nationale de l'Air et accessible wadis of mountain massifs, and the popula- du Tenere), prohibiting hunting, and controlling use of tion in the Air massif was recognized as the largest and the reserve's resources. The main reason for establishing only viable one within the Saharo-Sahelian limits the reserve was to conserve threatened Saharo-Sahelian (Poilecot, 1996). Recently, however, local authorities fauna. In 1991 the reserve was placed on the United have suggested that the population was extirpated Nations Educational, Scientific and Cultural Organiza- during the Tuareg rebellion of 1991-1997 (S. Seydou, tion (UNESCO) List of World Heritage in Danger at the DEPP (Direction de la Faune, de la Peche, et de la request of the government of Niger. Pisciculture), pers. comm.). We therefore conducted a The ostrich Struthio camelus is the largest extant survey in autumn 2000 of red-necked ostriches in the Air flightless bird. Although records indicate that it was mountains with the aim of providing data on the current once widely distributed throughout Africa, parts of status of the species. We also examined the literature for Arabia and nearby regions in the Middle East, the any evidence of decline. species is now restricted to only a fraction of its former We conducted a vehicle-based survey during range (Brown et al., 1982). The nominate Struthio camelus 14 consecutive days in October and November 2000, camelus, once distributed throughout northern Africa, following the same route used by Mouddour in 1997 has been severely persecuted during the 20th century, and 1998 (Mouddour, 1998a, b) and working mainly in and populations are believed to be fragmented and in areas where ostriches were commonly reported before rapid decline (del Hoyo et al, 1992; Dragesco-Joffe, the civil war (Magin, 1990a). In addition, the survey was 1993). Causes of decline include intensive hunting, and extended to the north-west and north of Tamgak massif, habitat destruction in the form of overgrazing by a poorly surveyed but well vegetated area where we domestic and feral livestock (Brown et al., 1982; del suspected that some ostriches might have found refuge Hoyo et al, 1992). Most of these ostrich populations (Fig. 1). Areas further north or south were not visited have been listed in Appendix I of CITES and are because there were no recent reports or sightings of birds, and unsuccessful searches were conducted in these areas in 1997 (Mouddour, 1998 a, b). We searched for ostriches on either side of two linear Stephane Ostrowski (Corresponding author) National Wildlife Research transects, each surveyed from a four-wheel drive Center, PO Box 1086, Taif, Kingdom of Saudi Arabia. E-mail: vehicle. Each of the two teams consisted of a driver/ [email protected] observer and three additional observers, with five of Mahaman Sani Massalatchi and Mamadou Mamane IUCN, The World the eight observers being Tuareg inhabitants of the Conservation Union, PO Box 10993, Niamey, Republic of Niger protected area. Each team was assigned a daily transect prepared using Geographical Positioning System Revised manuscript accepted for publication 9 July 2001 349 © 2001 FFI, Oryx, 35(4), 349-352 Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.19, on 29 Sep 2021 at 13:19:22, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1046/j.1365-3008.2001.00205.x 350 S. Ostrowski et al. Air and Tenere National Nature Reserve Iferouane V Timia o V Tabelot Fig. 1 Map of the Air and Tenere National Nature Reserve showing the eastern limit V of ostrich distribution, the survey route of the IUCN mission in 2000, and locations of last reported ostriches in the Air region. *•" Recent records of wild ostrich in the Air region Records of ostriches outside the reserve: • Ostrich favoured habitat (Magin, 1990a} 50 km *M. Mouddour, IUCN, and N. Gohe, [H Mountain massif Direction de la Faune, de la Peche, et de la -~" Survey route of IUCN mission in 2000 Pisciculture (DFPP) (pers. comm.), - - Eastern limit of ostrich distribution in the ATr **A. Tchouli and M. Mouddour, IUCN (pers. comm.). software (Mapsource, Garmin Corporation, Olathe, KS, viewed stated that they had not observed any ostriches USA). With an approximate mean distance of 1000 m in the area during 1999-2000. Wildlife guards and IUCN between the vehicles, and assuming that 500 m either staff members suggested that the disappearance of the side of the vehicle could be surveyed, a total of species from the protected area had occurred 'some c. 2200 sq km was surveyed during the 1100 km long time' after the end of the Tuareg rebellion in 1997. Two trip. This is 17 per cent of the total known ostrich nomads stated that a small number of ostriches (<10) habitat of c. 13,000 sq km (Magin, 1990a). We also might still occur east of the Takaloukouzet massif questioned 37 adults (three IUCN staff members, three (Fig. 1), an area that we did not survey during our visit. wildlife guards, two tour operator guides and 29 local One tour operator guide observed an individual of people in Iferouane, Tin Telloust and along our unknown sex south-east of the protected area in autumn transect routes) about the presence of ostriches in the 1999 (A. Tchouli, IUCN, unpublished data). One adult area and in neighbouring secondary wadis that we male and one adult female were still present south-west could not investigate. Interviews were in Tamachek or of Iferouane and south-east of the protected area, French, following a standardized questionnaire (avail- respectively (M. Mouddour, IUCN and N. Gohe, DFPP, able from S.O.) and with the help of two or three unpublished data). A small number of ostriches were interpreters as necessary. reported to the south-east of the reserve (A. Tchouli and Apart from a pair of ostriches captured as chicks in M. Mouddour, IUCN, unpublished data). 1996 and kept captive in Iferouane, we did not locate Comparing our survey with previous counts provides any ostriches nor any recent sign, such as footprints, evidence for a dramatic decline in numbers. Until 1990, faeces or feathers, of their presence. Everyone inter- red-necked ostriches, although heavily poached © 2001 FFI, Oryx, 35(4), 349-352 Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.19, on 29 Sep 2021 at 13:19:22, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1046/j.1365-3008.2001.00205.x Dramatic decline of ostrich in the Air 351 Table 1 Population estimates of red- necked ostrich in the Air and Tenere Estimated Area surveyed Survey Reserve between 1986 and 2000. Year population size (sq km) effort Reference 1986 c. 400 8000-10,000 12 months Watkins (1986) 1990 1600 (±950) 13,000 22 months Magin (1990a, b) 1996 20-30 800-1100 10 days Mouddour (1998a) 1997 <15 800-1100 7 days Mouddour (1998a) 1998 <20 800-1100 9 days Mouddour (1998b) 2000 0 2200 14 days This study throughout their range, were found in the reserve in Although we were eight observers and ostriches are reasonable numbers (Watkins, 1986; Magin, 1990b; large birds that are relatively easy to detect, it is possible Table 1). Even the combination of drought between that we might have missed a small number of individ- 1983 and 1985 and the over-utilization of Acacia trees by uals, and it is also possible that the sound of our vehicles browsing livestock did not seem to affect ostrich could have scared the ostriches away before we had a population growth in the short term (Watkins, 1986). chance to see them. However, previous surveys (Magin, In 1990 Magin estimated the ostrich population at 1600 1990a; Mouddour, 1998a, b) were also from vehicles, and (±950) individuals using a strip transect survey method the nature of the terrain makes it unlikely that these birds over the entirety of the ostrich habitat (Magin, 1990a). could have moved out of sight before they were seen. Between August 1988 and May 1990 Magin estima- Although our survey route covered only 17 per cent of ted that ostrich densities in large wadis and diffuse the described ostrich range in the protected area, it was water drainages were 0.12-0.18 birds per sq km (Magin, centred on the species' preferred habitats: major wadis 1990a, b).