Globally Threatened Amphibian Species Part 1

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150 Threatened Amphibians of the World EN Astylosternus laurenti Amiet, 1978 “1977” Endangered B1ab(iii)+2ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © Mary E. Gartshore Geographic Range This species is known only from a small part of south-western Cameroon at 400-850m asl, from the Ikenge Research Station in Korup National Park, to the south of the Rumpi Hills, Mount Manenguba and the Bamileke Plateau. There are records from Ikenge, Fopouanga, Ekomtolo and Mahole. It is probably a little more widespread than current records indicate. Population It is a common species. Habitat and Ecology It lives and breeds in and near slow-flowing rivers and streams in lowland and hilly forest in regions of high rainfall. It can live in dense secondary forest provided that there is a closed canopy. Males call from rocks in and around the water. Major Threats This species is severely threatened by habitat loss and degradation, primarily due to human settlement and agricultural encroachment. Conservation Measures It occurs in Korup National Park, but further protection of other unprotected forest habitat, such as Mount Manenguba, is required. Bibliography: Amiet, J.-L. (1977), Lawson, D.P. (1993) Data Providers: Jean-Louis Amiet CR Astylosternus nganhanus Amiet, 1978 “1977” Critically Endangered B1ab(iii)+2ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing Geographic Range This species is known only from Mount Nganha on the Adamawa Plateau, at 1,400-1,700m asl, in Cameroon, to which it is probably endemic. Population It is known only from five specimens. Habitat and Ecology This species is found along watercourses in a few narrow gallery forests, and in seepage areas in nearby grassland. Tadpoles, almost certainly of this species, have been found in rock pools in streams. Major Threats This poorly known species is probably at severe risk from habitat loss due to smallholder farming activities and subsistence wood extraction. Conservation Measures It is not known from any protected areas and protection of the remaining habitat in the range of the species is urgently needed. Further survey work is required to establish the current population status of the species. Bibliography: Amiet, J.-L. (1977) Data Providers: Jean-Louis Amiet EN Astylosternus perreti Amiet, 1978 “1977” Endangered B1ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © David C. Blackburn, courtesy of Project Exploration Geographic Range This species is known only from western Cameroon on the southern slopes of Mount Manenguba and from Mount Bana and Mount Nlonako on the Bamileke Plateau at an altitude of 1,200-1,400m asl. It presumably occurs more widely in the Bamileke Plateau, and there is an unconfirmed record from the Rumpi Hills. Population It is common on Mount Manenguba. Habitat and Ecology It lives in or near flowing water in lower montane and submontane forest, often in very steep, precipitous areas close to torrents. It probably hides in holes during the day, and breeds in mountain streams. Major Threats This species is experiencing severe habitat loss within its very small range. However, it is capable of adapting to a measure of forest degradation. Conservation Measures The species is not known from any protected areas, and habitat protection of the remaining montane forests in western Cameroon is urgently needed. Bibliography: Amiet, J.-L. (1977), Gartshore, M.E. (1986), Herrmann, H.-W. et al. (2005) Data Providers: Jean-Louis Amiet EN Astylosternus ranoides Amiet, 1978 “1977” Endangered B1ab(iii)+2ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © Jean-Louis Amiet Geographic Range This species is known only from high altitudes (2,000-2,600m asl) in western Cameroon; there are records from the Bamboutos Mountains, Lake Oku, and Mount Neshele in the Bafut-Ngemba Forest Reserve. Population There is no information on its population status. Habitat and Ecology It lives in grassy marshes, around lakes, and along streams and watercourses in montane forest, montane shrubland, and montane grassland. Its breeding habitat is not fully known, but it appears to be less tied to fl owing water than other members of its genus. Major Threats Overgrazing, forest clearance, and changes in water quality are probably the major threats to this species. Conservation Measures It occurs in the Bafut-Ngemba Forest Reserve, but is largely unprotected elsewhere in its range. A conservation project has been conducted on Mount Oku for several years by BirdLife International, which involves community management of the area involving the local villages, but which needs to take into account the conservation needs of this species. Further survey work is needed to determine the species’ current population status. Bibliography: Amiet, J.-L. (1977), Amiet, J.-L. (1989), Gartshore, M.E. (1986) Data Providers: Jean-Louis Amiet
Globally Threatened Amphibian Species 151 VU Astylosternus rheophilus Amiet, 1978 “1977” Vulnerable B1ab(iii)+2ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © Václav Gvoždík Geographic Range This species is endemic to western Cameroon at altitudes of 1,300-2,450m asl. The nominate subspecies is recorded from Mount Manenguba, Mount Mbam, Santa, Mount Bana, Mount Ngokham, the Bamboutos Mountains, and the Bafut-Ngemba Forest Reserve, and is likely also to occur on Mount Oku. The subspecies A. r. tchabelensis is known only from the southern slopes of Tchabal Mbaba, at 1,700-1,900m asl, in Cameroon, and might occur on the Mambila Plateau in eastern Nigeria. Population It is a very common species. Habitat and Ecology It lives in both the submontane and montane zones, and is typically associated with small streams in forest where it breeds. However, at higher altitudes above 2,000m asl it can also be found along streams in montane grassland, sometimes bordered with trees. It seems able to tolerate minor disturbance of its habitat. The subspecies A. r. tchabelensis lives in relict gallery forests in a generally deforested area. Major Threats Although it is likely that it can tolerate a degree of habitat alteration, this species is probably declining as a result of widespread habitat loss and degradation within its restricted range, mainly due to smallholder agricultural activities, subsistence wood extraction, and human settlement. Conservation Measures It occurs in the Bafut-Ngemba Forest Reserve. Bibliography: Amiet, J.-L. (1977), Amiet, J.-L. (1989) Data Providers: Jean-Louis Amiet EN Astylosternus schioetzi Amiet, 1978 “1977” Endangered B1ab(iii)+2ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © David C. Blackburn Geographic Range This species is known only from two general areas in south-western Cameroon: Apouh and Koupongo, near Edéa, in southern Cameroon (these two localities are 50km apart, and are separated by the Sanaga River). Records from the northern part of Korup National Park, east to Nguti, and north to Mount Nta Ali (Lawson 1993) are based on misidentifi cations and refer to Astylosternus diadematus (J.L. Amiet pers. comm.). Population It appears to be a rare species occurring at low densities in the southern parts of its range. Habitat and Ecology It lives in and near flowing water in lowland forest, and can survive in tall, secondary forest. It breeds in small streams and in marshy depressions with very small, superficial streams. Major Threats The major threat to the species is habitat loss and degradation. Conservation Measures It might occur in the Douala-Edea Forest Reserve and Lac Ossa Wildlife Reserve. The remaining forest habitat in south-western Cameroon is urgently in need of improved protection. Bibliography: Amiet, J.-L. (1977), Lawson, D.P. (1993) Data Providers: Jean-Louis Amiet VU Leptodactylodon albiventris (Boulenger, 1905) Vulnerable B1ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © Ignacio De La Riva Geographic Range This species is known only from the western edge of the southern Cameroon plateau, though it might occur more widely than current records suggest. Its altitudinal range is 300-1,000m asl. Population It is an uncommon species. Habitat and Ecology This is a species of lowland rainforest in hilly country. It is not known to what extent it can adapt to forest disturbance. It breeds in streams, and the males call from rocky areas (under rocks or in cracks) close to small streams. Major Threats The major threat to this species is habitat loss from smallholder farming activities and logging. Conservation Measures It is not known from any protected areas, though it might occur in Campo-Ma’an National Park. There is a need for improved habitat protection at sites at where the species is known to occur. Notes on taxonomy: Following Amiet and Dowsett-Lemaire (2000), Leptodactylodon bueanus is here considered a separate species from L. albiventris (as opposed to a subspecies of L. albiventris following Amiet (1987)). Rödel and Pauwels (2003) provisionally assigned records of L. albiventris from Equatorial Guinea (De la Riva 1994b) to L. stevarti. Bibliography: Amiet, J.-L. (1980a), Amiet, J.-L. (1987), Amiet, J.-L. and Dowsett-Lemaire, F. (2000), Amiet, J.-L. and Schiøtz, A. (1972), De la Riva, I. (1994b), Frétey, T. and Blanc, C.P. (2000), Rödel, M.-O. and Pauwels, O.S.G. (2003) Data Providers: Jean-Louis Amiet EN Leptodactylodon axillaris Amiet, 1971 Endangered B1ab(iii) Order, Family: Anura, Astylosternidae Country Distribution: Cameroon Current Population Trend: Decreasing © David C. Blackburn Geographic Range This species is known from the Bamboutos Mountains in the Bamenda Highlands of western Cameroon, at altitudes of 2,300-2,700m asl. It probably also occurs on Mount Oku in the Bamenda Highlands. Population It is most common above 2,400-2,450m asl. Habitat and Ecology It lives in bamboo forest and, in the rainy season, grazed montane grasslands where it hides under rocks in seepage areas. It lives in drier areas than other members of its genus. It has never been found at its breeding sites, but it is likely to breed in small streams in rocky areas. Major Threats It is probably under severe threat from habitat loss and overgrazing. Like other high-altitude species, it also could be at risk from climate change. Conservation Measures This species is not known from any protected areas, and habitat protection is urgently needed in the Bamboutos Mountains. In view of its tiny range and possible impacts of climate change, a captivebreeding programme should probably be established. Bibliography: Amiet, J.-L. (1971a), Amiet, J.-L. (1980a) Data Providers: Jean-Louis Amiet
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