Boulder Chat

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210 Turdidae: thrushes, chats, robins and rockjumpers Boulder Chat 14˚ Swartberglyster BOULDER CHAT Pinarornis plumosus 1 5 The Boulder Chat is, by the nature of its preferred 18˚ habitat, a localized species with a restricted and fragmented distribution. It is probably most easily seen in the Matobo National Park (2028C,D) where the exposed granite system is extensive. 22˚ Within southern Africa, atlas data show it to be 6 found in the extreme east of Botswana, and in 2 Zimbabwe except for the northwestern quarter. In Zimbabwe the population appears to be split in two 26˚ with the dividing zone formed by the Save River flowing southeastwards and the Mupfure and Umniati rivers flowing northwestwards; this divi- sion was also shown well in Irwin (1981). Another 3 7 population occurs north of the Zambezi Valley in 30˚ Zambia, extending up the eastern side of the Luangwa Valley to Malawi (Keith et al. 1992). The species is nevertheless monotypic. 4 8 It is confined to those areas of the granite shield 34˚ in which the rock has been weathered into large 18˚ 22˚ 26˚ rounded boulders or where weathered sections of 10˚ 14˚ 30˚ 34˚ the domes have broken off and tumbled to form a coarse scree around their bases; it also occurs on isolated granite outcrops (Irwin 1981). It is absent from Karoo sandstones (Irwin 1981) and probably also from the Karoo Recorded in 146 grid cells, 3.2% basalts. Areas of granite, when undisturbed, are frequently Total number of records: 552 well vegetated with a variety of tree species underlain with Mean reporting rate for range: 11.3% various shrubs and creepers forming part of the miombo woodland system. This vegetation is of prime importance for this species. However, over-vegetating of these koppies often leads to their desertion by the Boulder Chat, as has happened in areas where the exotic bush Lantana camara has spread rapidly (pers. obs). Reporting rates for vegetation types Egglaying takes place September–January with a pro- % 0246 nounced peak October–November (Irwin 1981; Skinner 1995a); family parties persist through to the beginning of the Miombo 4.3 next breeding season. Mopane 1.4 Although habitat modification may affect it, there is no Arid Woodland 1.0 overall threat to the Boulder Chat at present. E Zimbabwe Highlands 0.2 A.J. Tree 8 6 1 5 40 4 20 2 8 6 2 6 40 4 20 2 8 6 3 7 40 4 20 2 8 Occurrence reporting rate (%) Breeding reporting rate (%) 6 4 8 40 4 20 2 J ASONDJ FMAMJ J ASONDJ FMAMJ Models of seasonality for Zones. Number of records (top to bottom, left to right): Occurrence: 0, 0, 0, 0, 336, 78, 0, 0; Breeding: 0, 0, 0, 0, 5, 2, 0, 0..

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