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- W2624026418 abstract "The abundance (= number of individuals) of populations of avian species endemic to the South African geographical region was estimated both inside and outside the region's nature-reserve system. The southwestern part of the region contains the greater proportion of the 33 endemic and 11 near-endemic (at least 90% of a species' range or population occurring within the region) species. Nearly all these species are represented by breeding populations in established nature reserves. However, the nature-reserve populations of 24 (55%) of the 44 species are relatively small (l 1 000 individuals each) and are fragmented further into semi-isolated subpopulations. The species with the smallest (l 500 individuals each) total populations breeding in nature reserves are essentially inhabitants of either the region's Karoo or grassland biomes or both. None of the species has a total breeding population smaller than 500 birds, and only in the black harrier Circus maurus is the total breeding population unlikely to exceed 1 500 individuals. Apart from this species, there are substantial (g 1 500 individuals per species) breeding populations of all of the South African endemic and near-endemic birds. The priority for preserving viable populations of the more vulnerable species (in terms of their relatively small breeding populations) is clearly vested in the creation of several new and large nature reserves in the region's Karoo and grassland biomes.Die voorkoms (= aantal individue) van voelspesie-bevolkings endemies aan die Suid-Afrikaanse geografiese gebied, is geskat beide binne en buite die gebied se natuurreservaatstelsel. Die suidwestelike deel van die gebied beskik oor groter verhoudings van die totale van 33 endemiese en 11 na-endemiese (ten minste 90% van die spesie se verspreiding of bevolking kom voor in die gebied) spesies. Al hierdie spesies word verteenwoordig deur bevolkings wat broei in gevestigde natuurreservate. Die natuurreservaatbevolkings van 24 (55%) uit die 44 spesies is nietemin relatief klein (l 1 000 individue elk) en verder gefragmenteer in semigeisoleerde subbevolkings. Die spesies wat in natuurreservate broei met die kleinste (l 500 individue elk) totale bevolkings is bykans deur die bank inwoners van die gebied se Karoo- en / of grasveldbiome. Geeneen van hierdie spesies het 'n broeibevolking van minder as 500 voels nie, en slegs vir die swartvleivalk Circus maurus is die broeibevolking waarskynlik minder as 1 500 individue. In werklikheid, afgesien van hierdie spesie, bestaan daar aansienlike (g 1 500 individue per spesie) broeibevolkings van al die Suid-Afrikaanse endemiese en na-endemiese voelsoorte. Die prioriteit om lewensvatbare bevolkings van die meer kwesbare spesies te bewaar (in terme van hul relatiewe klein broeibevolkings) berus duidelik op die daarstelling van verskeie nuwe en groot natuurreservate in die gebied se Karoo- en grasveldbiome." @default.
- W2624026418 created "2017-06-15" @default.
- W2624026418 date "1993-01-01" @default.
- W2624026418 modified "2023-10-17" @default.
- W2624026418 title "Conservation status of the South African endemic avifauna" @default.
- W2624026418 doi "https://doi.org/10.1016/0006-3207(93)90367-a" @default.
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