Steven W Evans

Steven W Evans
Little Karoo

PhD Zoology (Ornithology)
Steven W Evans Avifaunal Assessments for EIAs

About

81
Publications
19,808
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
322
Citations
Additional affiliations
April 2014 - March 2017
North-West University
Position
  • Fellow
Description
  • Co-supervising a MSc student, Mr Luckson Muyemeki, working on a project aimed at assessing whether or not sulphur dioxide air pollution affects birds around Matimba power station.
March 2014 - June 2014
University of Venda
Position
  • PostDoc Position
Description
  • Presented a three-day course on Statistics Literacy for all interested post-graduate students
February 2014 - November 2014
University of Venda
Position
  • PostDoc Position
Description
  • Co-supervised a BSc Hon student, Mr Cavin Shivambu, working on a project aimed at determining whether three recently introduced species of spider could become invasive in South Africa. The project relied on MaxEnt modelling.
Education
September 1996 - September 2010
North-West University
Field of study
  • Zoology

Publications

Publications (81)
Book
Full-text available
This book highlights the link between the Goukou area’s most important avian seed dispersers and the indigenous vegetation that they help spread and propagate. This vital role demonstrates the value of these birds as critical agents in our natural ecosystems. Even when there seem to be many of them, and to humans they can be perceived as a pest, th...
Technical Report
Full-text available
The report identifies the bird species responsible for the dispersal of the seeds of species of trees and shrubs important for the rehabilitation of the upper catchment of the Goukou River.
Article
The Northern Black Korhaan Afrotis afraoides and the Southern Black Korhaan Afrotis afra were previously considered conspecific, but were subsequently separated based on habitat, plumage, displays and vocalisations of the males and genetic differences. The Northern Black Korhaan is endemic to predominantly north of the Great Escarpment in southern...
Article
Full-text available
The Agulhas Long-billed Lark Certhilauda brevirostris is a South African endemic and is restricted to the fynbos habitat of the Agulhas Plain in the southwestern corner of South Africa. The 1990, 2014, and 2018 land use land cover (LULC) databases prepared for South Africa were used to determine the LULC categories that best describe suitable habit...
Article
Full-text available
Traditional cultural beliefs influence perceptions of animals and can result in persecution of wildlife. In Africa, stigmas against species associated with witchcraft can act as a barrier to the uptake of sustainable practices such as reducing crop damage through reliance on indigenous predators rather than pesticides to control rodent agricultural...
Technical Report
Full-text available
Sustainable development is achieved by ensuring that the benefits people derive from ecosystems are maintained. Environmental Impact Assessments (EIA) contribute to achieving sustainable development. EIA is defined as ‘the process of identifying, predicting, evaluating, and mitigating the biophysical, social, and other relevant effects of developme...
Article
The Blue Swallow is an intra-African migrant that breeds in its fragmented range from South Africa to southern Tanzania, from October to March annually. The birds migrate north and are on their non-breeding range in NE DRC, Uganda, NW Tanzania and W Kenya, from April to September annually. The global Blue Swallow population, estimated at <1 500 pai...
Article
The distances covered by migrant birds have been the subject of many studies. There are no estimates of the distances travelled by resident birds spending different amounts of time per day flying. Selection pressures similar to those due to migration are hypothesised to select for high aspect ratio wings, with low wing loading, among resident birds...
Technical Report
Full-text available
The aim of this Avifaunal Impact Assessment is to identify, predict, evaluate, and mitigate the effects of developing two new farm dams, expanding the size of one farm dam and installing pipelines between them on birds, especially Striped Flufftail Sarothrura affinis and other threatened birds on the farm Spitzkop (1/25 and RE/25).
Technical Report
Full-text available
The aim of this Avifaunal Impact Assessment was to identify, predict, evaluate, and mitigate the effects of developing two center pivots, and four dry pastures on birds, especially threatened species breeding and/or feeding on the farm Kruis Rivier.
Preprint
Full-text available
Traditional cultural beliefs influence perceptions of animals, and in some cases can result in persecution of wildlife. Stigmas against species associated with witchcraft, for example, can act as a barrier to the uptake of more cost effective, sustainable, and environmentally sound practices such as reducing crop damage by controlling rodent agricu...
Article
Full-text available
Human-dominated landscapes comprise the bulk of the world's terrestrial surface and Africa is predicted to experience the largest relative increase over the next century. A multi-scale approach is required to identify processes that maintain diversity in these landscapes. Here we identify scales at which animal diversity responds by partitioning re...
Data
List of bat species, families and foraging groups recorded from manual identifications of a random subset of four sites (two nights each) per village, and the codes given to species-groups defined for subsequent automated identification with minimal overlap in call parameters using scans and filters in Analook v. 4.1t, 2015 (Titley Electronics, www...
Data
Proportion of total richness contributed by alpha and beta components for all seven taxa based on individual- and sample-based partitioning respectively. (DOCX)
Data
Response of animal communities to three land use types: Croplands, settlements, and rangelands in a rural landscape using two response variables, (a) abundance and (b) richness. All values were standardized for comparison to represent standard deviations from the mean. Whiskers represent the range, boxes the first and third quartiles, dark lines th...
Data
R-script and associated R output of PERMANOVA analyses for acoustically-obtained (SM2 bat detectors, Wildlife Acoustics) abundance data for 13 species-groups of bats using Bray-Curtis distance. Analyses were conducted in R using the “vegan”, “car” and “MASS” packages. Species group codes and foraging associations (open-air, clutter and clutter-edge...
Article
The globally threatened blue swallow Hirundo atrocaerulea, with <1500 pairs remaining, is an intra-African migrant, breeding in eight countries in East Africa and Southern Africa, with nonbreeding birds in four countries in East Africa. Blue swallows build an open cup-shaped nest out of mud and straw in an existing hole in the ground. An updated de...
Article
Full-text available
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 effect of SO2 pollution on bird communities is poorly understood. Using point coun...
Article
Determining changes in land use/land cover (LULCC) can be used to assess and monitor habitat loss as one of the five global priority causes of biodiversity loss. In South Africa, two national land-cover (NLC) datasets have been developed from satellite imagery obtained in circa 1990 and 2013/2014. The Vhembe Biosphere Reserve (VBR), designated in 2...
Poster
Full-text available
The aim of this project was to determine how bird populations and communities are affected by different resource uses in an agri-ecosystem. The study was conducted in three broadly delineated habitat types 1) residential area (Vyeboom village), 2) abandoned fields and 3) least modified area (“control”).
Article
A survey of seabirds and turtles at St Brandon’s Rock, 400 km north of Mauritius, was undertaken in 2010. We estimated that 1 084 191 seabirds comprising seven breeding species and excluding non-breeders were present at the archipelago and we counted 279 turtle tracks and nesting pits of green turtles Chelonia mydas. Hawksbill turtles Eretmochelys...
Article
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 sites) from 20 individuals in order to investigate phylogenetic relationships acr...
Article
Full-text available
The dimensions of three nests were measured, and the time activity budget of a pair of Angola Swallows Hirundo angolensis was monitored at a nest at a convention centre in Uganda. Two adult Angola Swallows tending to three 5–7 day old nestlings spent the majority of their time (76.6–94.8%) away from the nest, presumably foraging. Nestlings were pr...
Article
Isolated coral atolls are not immune from marine debris accumulation. We identified Southeast Asia, the Indian sub-continent, and the countries on the Arabian Sea as most probable source areas of 50 000 items on the shores of St. Brandon’s Rock (SBR), Indian Ocean. 79% of the debris was plastics. Flip-flops, energy drink bottles, and compact fluore...
Article
Full-text available
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 travelled in search of Blue Swallows (at an altitude of above 1 400 m above sea level). Blue Swallo...
Research
Full-text available
Abstract: The Blue Swallow, Hirundo atrocaerulea, is considered threatened due to its small and rapidly declining population, resulting from the swift reduction in the quantity and quality of its unique grassland and wetland habitat. The Blue Swallow breeds in South Africa, Swaziland, Zimbabwe, Mozambique, Malawi, Zambia, Tanzania and the Democrati...
Research
Full-text available
Poster presented at the 2015 Conference of the Ecology Society of Germany, Austria and Switzerland (GFÖ). The poster presents results of a study looking at the effects of three landuse types, in an agri-ecosystem, on bird species richness and abundance in the northern Limpopo Province of South Africa.
Research
Full-text available
Africa contains more than 300 threatened species of birds that would significantly benefit from the compilation and implementation of Species Action Plans. Until recently, the capacity for this form of species conservation planning in Africa was limited. Through the Species Action Planning Project, jointly funded by the UK Darwin Initiative and...
Research
Full-text available
A Site Conservation Plan to conserve the Wolkberg to Woodbush (WWA) area in South Africa’s Limpopo Province is a flexible working strategy that identifies and prioritises the problems and proposes practical solutions, specifies certain actionsand responsibilities within agreed timeframes, based on specific objectives which are regularly monitore...
Article
Full-text available
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 status and threats facing this migratory species. Three previously unknown areas that might be part of th...
Article
Full-text available
A population of African tigerfish Hydrocynus vittatus from the Schroda Dam, actively prey on barn swallows Hirundo rustica in flight. This behaviour was discovered during a radio telemetry study and documented using a motion picture video camera. These results show that an avivorous diet is a part of the feeding biology of H. vittatus, and may occu...
Data
Video S1. Surface and sub-surface pursuits of Hirundo rustica by Hydrocynus vittatus; Unsuccessful and successful aerial strike of Hydrocynus vittatus on Hirundo rustica from deep water.
Article
Full-text available
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 tools being used to address this issue and restore the population to its historic range is reintroduction...
Conference Paper
Full-text available
Little information is available on marine litter from the Indian Ocean. St Brandons Island (also known as Cargados Carajos), an atoll 430 km northeast of Mauritius (16º 40’S 59º 38’E) is little known biologically, but is considered relatively pristine, with few inhabitants (rotating presence of 50 fishermen and Government of Mauritius officials) wi...
Article
Full-text available
The blue swallow (Hirundo atrocaerulea) is one of the most threatened bird species in southern Africa. Among terrestrial birds, its plumage is known to be the most water repellent, an adaptation to foraging on the wing in dense fog. Despite this unique adaptation, the nesting success of the blue swallow at the Blue Swallow Natural Heritage Site (BS...
Article
This study investigated the utilization of mist-belt grassland habitat by the threatened blue swallow and was conducted over three successive breeding seasons in the Blue Swallow Natural Heritage Site at Kaapsehoop, Mpumalanga, South Africa. Blue swallows significantly preferred wetlands over grasslands for foraging. Sufficient foraging habitat mus...
Article
Full-text available
The Blue Swallow Hirundo atrocaerulea is restricted to sub-Saharan Africa, its population size previously estimated at fewer than 1,500 pairs, and is classified as Vulnerable. A better understanding of its current distributional range, population size, protection status and migration routes would improve our ability to conserve the species and the...
Technical Report
Full-text available
As a direct result of the general extermination of larger predators such as Lion (Panthera leo) and Brown Hyaena (Hyaena brunnea) in some regions of South Africa, the Black-backed Jackal (Canis mesomelas) and the Caracal or Lynx (Caracal caracal) have become bigger threats to livestock, while smaller carnivores such as genets (Genetta spp.), mon...
Technical Report
Full-text available
This Action Plan is an output of a three-year project entitled “Action Plans for the conservation of Globally Threatened birds in Africa”, which in turn is part of the Species Conservation Programme of the African Partnership of BirdLife International. Major support for the project came from the UK Department for the Environment, Food and Rural Aff...
Technical Report
Full-text available
The Maccoa Duck Oxyura maccoa is a poorly-known and scarce species confined to Africa, with northern (Ethiopia, Kenya, Tanzania and Eritrea) and southern (Angola, Namibia, Botswana, Zimbabwe, South Africa and Lesotho) populations. Previously estimates of its population size, particularly northern populations, were not based on hard data. These repo...
Technical Report
Full-text available
This Action Plan provides a framework within which the conservation status of globally Vulnerable Lappet-faced Vulture Torgos tracheliotusmay be improved. It sets out conservation strategies aimed at stabilising and/or increasing the Lappet-faced Vulture populations across their range. The major outputs are: the distribution, population size and...
Technical Report
Full-text available
BirdLife International is a global Partnership of people working for birds and the environment that is present in more than 100 countries. Over five million people support the BirdLife Partnership of national non-governmental conservation organisations (Partners) and local networks (Site Support Groups or IBA Caretakers). The BirdLife Partnership w...
Chapter
Full-text available
Technical Report
Full-text available
The Blue Swallow ( Hirundo atrocaerulea) has a range of ten African countries including South Africa, Swaziland, Zimbabwe, Mozambique, Malawi, Zambia, the Democratic Republic of Congo, Tanzania, Uganda and Kenya. The distribution of the Blue Swallow is fragmented over much of its range and the migratory and dispersal behaviour of this species is...
Technical Report
Full-text available
The Blue Swallow Hirundo atrocaeruleais considered globally Vulnerable with fewer than 1500 pairs remaining in suitable grassland habitats in east and southern Africa. The South African Blue Swallow population is considered to be Critically Endangered with fewer than 100 breeding pairs. A conservation plan compiled by all relevant stakeholders o...
Technical Report
Full-text available
The Southern Bald Ibis Geronticus calvus is considered Vulnerable with a declining population of between 8,000 and 10,000 individuals remaining in suitable grassland habitats in north-eastern South Africa, Lesotho and west Swaziland. The Southern Bald Ibis is known to breed at less than 2,000 colonies on suitable cliffs usually associated with wate...
Technical Report
Full-text available
The White-winged Flufftail Sarothrura ayresiisconsidered globallyEndangered withfewerthan 700 individuals remainingin suitable wetlandhabitats inSouth Africa and Ethiopia. The South African White-winged Flufftail population is considered to beCritically Endangeredas it has a very smallpopulation andis only known from10 wetlandsites inthe Eastern Ca...
Technical Report
Full-text available
The White-winged Flufftail Sarothrura ayresiis considered globally Endangered with fewer than 700 individuals remaining in suitable wetland habitats in South Africa and Ethiopia. The Ethiopian population is considered to be Critically Endangered as it has a very small population and is only known from 2 wetland sites in the Ethiopia. A conservation...
Technical Report
Full-text available
The BirdLife Botswana Crane Working Group, in conjunction with BirdLife South Africa and with support from the Global Environment Facility/ Small Grants Programme, Endangered Wildlife Trust of South Africa and the International Crane Foundation, hosted the Botswana Wattled Crane Species Action Plan workshop. The workshop was held in Maun from 6th t...
Technical Report
Full-text available
The Blue Swallow (Hirundo atrocaerulea) has a range of ten African countries including South Africa, Swaziland, Zimbabwe, Mozambique, Malawi, Zambia, Democratic Republic of Congo, Tanzania, Uganda and Kenya. The distribution of the Blue Swallow is fragmented over much of its range and the migratory or dispersal behaviour of this species is spars...
Technical Report
Full-text available
The Cape Parrot Poicephalus robustus is endemic to South Africa. Key threats are habitat destruction, seasonally depleting food sources, low nest-site availability, illegal trapping for trade, and disease (Psittacine Beak and Feather Disease Virus). The distribution of the parrot is restricted to the fragmented afromontane forests of southern KwaZu...