Avian assemblages of river valleys in Lesotho Lowlands, Senque Valley and Foothills. - G. Kopij. - Berkut. 21 (1-2). 2012. - P. 23-30.
During the years 1997–2002 line transect method has been employed to assess species diversity, dominance structure and relative abundance of birds resident (breeding) in 21 randomly selected stretches of rivers and streams in Lowlands, Foothills and Senque Valley in Lesotho. Total length of transects was c. 92 km. In general, the species diversity in river and stream valleys was higher than in other habitats within the Highveld Grassland. In five stretches of a relatively big lowland river, Phutiatsana, 62 species were recorded, with only three dominants: Cape Canary, Laughing Dove and Grey-headed Sparrow (25.4%). In four selected stretches of the Senque Valley, lower number of species (47) were recorded, but there were more dominants, both in terms of the number of species (Cape Canary, Grey-headed Sparrow, Neddicky, Karoo Prinia, Red-winged Starling, Cinnamon-breasted Bunting and Cape Bunting) and resident pairs (36.4%). In five selected stretches of four streams in foothills: Mahalenyane, Thupa-Kubu, Mahaleng and Likolobeng, 58 species were recorded, with six dominants (Cape Canary, Karoo Prinia, Cape White-eye, Cape Robin-Chat, Cape Bunting and Laughing Dove) comprising 44.7% of all. Avian assemblages in lowland streams, Liphiring and Mohlaka-oa-tuka, flowing through deep gorges, were composed of 63 species. The group of dominant species was composed of seven species in dry (58.5%) and only three species (33.3%) in rainy season. Proportions for some congeneric species (i.e: Streptopelia, Passer, Serninus/Crithagra, Emberiza, Cisticola) were calculated. [English].
Key words: South Africa, count, species diversity, dominance structure, relative abundance.
Address: University of Namibia, Department of Wildlife Management; Katima Mulilo Campus, Private Bag 1096, Winela Rd., Katima Mulilo, Namibia; e-mail: gkopij@unam.na.