Articles by Author: Steven W Evans

Search results for Steven W Evans

We found 95 results for you
  1. Developing a site selection tool to assist reintroduction efforts for the Southern Ground-Hornbill <em>Bucorvus leadbeateri</em>

    Developing a site selection tool to assist reintroduction efforts for the Southern Ground-Hornbill <em>Bucorvus leadbeateri</em>

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The Southern Ground-Hornbill Bucorvus leadbeateri (SGH) is regarded as Vulnerable globally and Endangered in South Africa as a result of losing close to 70% of its range and 50% of its historic population in the country. One of the conservation...
  2. Current conservation status of the Blue Swallow <em>Hirundo atrocaerulea</em> Sundevall 1850 in Africa

    Current conservation status of the Blue Swallow <em>Hirundo atrocaerulea</em> Sundevall 1850 in Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The global Blue Swallow Hirundo atrocaerulea was classified as Vulnerable in 2010 on account of its small and rapidly declining population estimated at less than 1 500 pairs. We undertook this study to gain a better understanding of the current...
  3. Current distribution and population size of the Blue Swallow <em>Hirundo atrocaerulea</em> in the southern Tanzanian highlands

    Current distribution and population size of the Blue Swallow <em>Hirundo atrocaerulea</em> in the southern Tanzanian highlands

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Two surveys of Blue Swallows were conducted in the southern Tanzanian highland grasslands in order to determine the habitat preferences and estimate the size of this subpopulation. During the 2008/09 and 2012 surveys, a total distance of 3 635 km was...
  4. Geographically widespread mitochondrial lineages of the African saw-wings inconsistent with species boundaries

    Geographically widespread mitochondrial lineages of the African saw-wings inconsistent with species boundaries

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The African saw-wings (genus Psalidoprocne) are a group of swallows endemic to sub-Saharan Africa. Although currently described as five species with several subspecies, the taxonomy of the saw-wings is unclear. We sequenced two mitochondrial genes (ND2 and cytb; 1 717...
  5. Bird species richness and densities in relation to sulphur dioxide gradients and environmental variables

    Bird species richness and densities in relation to sulphur dioxide gradients and environmental variables

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The expansion of coal-fired power stations in South Africa has resulted in growing environmental concerns as they are the largest emitters of sulphur dioxide (SO2). Sulphur dioxide emissions from power plants pose a potential threat to avian populations. However, the...
  6. AUDITORY COMMUNICATION IN THE BLUE WAXBILLS <em>URAEGINTHUS</em>

    AUDITORY COMMUNICATION IN THE BLUE WAXBILLS <em>URAEGINTHUS</em>

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Cantrell, M. A. & Evans, S. M. 1981. Auditory communication in the blue waxbills Uraeginthus. Ostrich 52:104-107.
  7. PATTERNS OF ARRIVAL AND DISPERSAL FROM A MIXED COMMUNAL ROOST OF SACRED IBISES AND MARABOU STORKS

    PATTERNS OF ARRIVAL AND DISPERSAL FROM A MIXED COMMUNAL ROOST OF SACRED IBISES AND MARABOU STORKS

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Evans, S. M., Cantrell, M. A. & Cram, A. 1982. Patterns of arrival and dispersal from a mixed communal roost of Sacred Ibises and Marabou Storks. Ostrich 53:230-234.
  8. BREEDING HABITS AND NESTING SUCCESS OF THE REDCHEEKED CORDON BLEU

    BREEDING HABITS AND NESTING SUCCESS OF THE REDCHEEKED CORDON BLEU

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Hamed, D. M. & Evans, S. M. 1983. Breeding habits and nesting success of the Redcheeked Cordon-bleu Ostrich 54:41-49.
  9. Divide and rule: on the rationalization of vocabulary teaching

    Divide and rule: on the rationalization of vocabulary teaching

    Item type: Journal Article • Journal: South African Journal of Linguistics
    Aangesien Engels die verkose onderrigmedium van die oorgrote meerderheid van Suid-Africa se nie-Engelstaliges is, is 'n besondere poging nodig om leerlinge vir die oorgang na Engels vroeg in hul skoolloop-bane voor te berei—'n oorgang wat juis saamval met 'n radikale...
  10. SHORT NOTES

    SHORT NOTES

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology