Search
Search results for
We found
53 results for you
-
Reductions in Plant Species Richness under Stands of Alien Trees and Shrubs in the Fynbos Biome
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.M. Richardson --- Jonkershoek Forestry Research Centre, I. A.W. Macdonald --- , G.G. Forsyth --- Jonkershoek Forestry Research Centre,The reduction of species richness of indigenous plants is one of the major problems associated with the presence of dense stands of invasive alien trees and shrubs in the Fynbos Biome of the Cape Province, South Africa. A synthesis was... -
Influence of climatic and edaphic factors on the distribution of eragrostis lehmanniana nees in Arizona, USA
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J R Cox --- US Department of Agriculture, USA G B Ruyle --- Renewable Natural Resources, USALehmann lovegrass (Eragrostis lehmanniana Nees) was introduced into Arizona, USA, from South Africa in 1932 and has since been sown throughout the southwestern USA and Northern Mexico. The species is well adapted in southeastern Arizona where it has been sown... -
Note on an invasion of intertidal zoanthid colonies by a chaetopterid polychaete at Park Rynie Beach, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: R. Biseswar G. K. Moodley A. D. NaidooAt Park Rynie Beach on the KwaZulu-Natal coast, South Africa, four species of zoanthids were invaded by a sand-tube building polychaete Mesochaetopterus minutus. It is a small polychaete about 15 mm long, which occurs gregariously in dense masses of sandy... -
AN ASSESSMENT OF THE POTENTIAL IMPACT OF ALIEN INVASIVE VEGETATION ON THE GEOMORPHOLOGY OF RIVER CHANNELS IN SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: Kate Rowntree --- Department of Geography, South AfricaInvasion of the riparian zone by alien vegetation is recognised as a serious problem in many areas of South Africa. Vegetation is a dynamic component of river channels. It is an important control variable affecting channel form whereas the flow... -
Bush clump succession in grassland in the Kei Road region of the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TG O'Connor --- , South Africa SC Chamane --- , South AfricaBush encroachment is a vegetation dynamic of global interest. This study describes the pattern of succession of bush clumps in the Eastern Cape, South Africa, using a space-for-time substitution. Clumps formed following establishment of mainly Acacia karroo in grassland through... -
Occurrence of dark septate endophytes in Nothofagus seedlings from Patagonia, Argentina
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: María E Salgado Salomón --- , Argentina Carolina Barroetaveña --- , Argentina Mario Rajchenberg --- , ArgentinaTemperate forests of southern Argentina and Chile cover a wide latitudinal and altitudinal range on both sides of the Andes, with Nothofagus species being one of the main tree species. Most of the larger remnants are protected within the limits... -
Rate and pattern of bush encroachment in Eastern Cape savanna and grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T.G. O'Connor V.R.T. CrowThe rate and pattern of bush encroachment in the grasslands and savannas of the Kei Road-Komga region of the Eastern Cape were quantified by analysis of nine sets of aerial photographs taken between 1937 and 1986. Woody cover increased from... -
Fish distributions in the Rondegat River, Cape Floristic Region, South Africa, and the immediate impact of rotenone treatment in an invaded reach
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OLF Weyl --- , South Africa BR Ellender --- Department of Ichthyology and Fisheries Science, South Africa DJ Woodford --- , South Africa MS Jordaan --- , South AfricaAlien fishes are considered the most serious threat to native headwater stream fishes in South Africa. A 4 km reach of the Rondegat River is the first section of a South African river to be rehabilitated through the attempted removal... -
Deja vu? A second mytilid mussel, Semimytilus algosus, invades South Africa's west coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K de Greef --- Department of Biological Sciences and Centre for Invasion Biology, South Africa C L Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa Z Zeeman --- Department of Biological Sciences and Centre for Invasion Biology, South AfricaA second marine mussel is shown to have invaded South Africa's west coast. Molecular techniques, based on intraspecific gene sequence divergences, prove its identity as Semimytilus algosus, a member of the family Mytilidae, native to Chile. The identity of an... -
Balanus glandula: from North-West America to the west coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Simon-Blecher Z Granevitze Y AchituvWe report the occurrence of the North-East Pacific intertidal barnacle Balanus glandula in the south-western African shores of the Atlantic Ocean. In addition, an attempt is made to trace the origin of the South African population by comparing the distribution... -
Vegetative traits predict grass species' invasiveness and the invasibility of restored grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RWS Fynn --- School of Biological and Conservation Sciences, South Africa PD Wragg --- School of Biological and Conservation Sciences, South Africa CD Morris --- Agricultural Research Council, South Africa KP Kirkman --- School of Biological and Conservation Sciences, South Africa J Naiken --- School of Biological and Conservation Sciences, South AfricaUnderstanding how grass species' traits relate to their invasiveness and the invasibility of their monocultures can inform restoration of diverse grassland. We measured vegetative traits for 18 bunch grass species local to Pietermaritzburg (KwaZulu-Natal, South Africa) and measured their competitive... -
Species-specific impact of introduced largemouth bass Micropterus salmoides in the Groot Marico Freshwater Ecosystem Priority Area, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PK Kimberg --- Hydrocynus Consulting, South Africa DJ Woodford --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa H Roux --- Department of Rural, Environment and Agricultural Development, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaLargemouth bass Micropterus salmoides are among the world's 100 worst invaders and negatively affect aquatic biodiversity in many regions worldwide. In South Africa there is a paucity of empirical studies describing their impacts. The impact of M. salmoides on the... -
Founder populations and the current status of exotic parrots in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Craig T Symes --- School of Animal, Plant and Environmental Sciences, South AfricaParrots (families Psittacidae and Cacatuidae) are one of the most threatened taxa of birds, with a combination of threats to wild populations, including capture for the cage bird market, habitat modification and destruction, persecution, disease, and threats from introduced species... -
Australian acacias as invasive species: lessons to be learnt from regions with long planting histories
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: David M Richardson --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa Johannes J Le Roux --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa John RU Wilson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaProblems associated with invasiveness of non-native tree species used in forestry are increasing rapidly worldwide and are most severe in areas with a long history of plantings. Lessons learnt in areas with long histories of plantings and invasions may be... -
Rapid bioassessment of the effects of repeated rotenone treatments on invertebrate assemblages in the Rondegat River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TA Bellingan --- Department of Zoology and Entomology, South Africa DJ Woodford --- Centre for Invasion Biology, South Africa J Gouws --- Scientific Services, CapeNature, South Africa MH Villet --- Department of Zoology and Entomology, South Africa OLF Weyl --- Centre for Invasion Biology, South AfricaThe potential collateral effects of eradicating invasive fishes in streams necessitate the monitoring of invertebrate communities during treatment. In an environmental rehabilitation programme, non-native smallmouth bass were removed from the lower reaches of the Rondegat River, Western Cape, South Africa,... -
First record of the Southeast Asian walking catfish, Clarias batrachus (Pisces: Clariidae), from the island of Mauritius, south-western Indian Ocean
Item type: Journal Article • Journal: African Zoology • Authors: Irfan Nunkoo --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Cecile Reed --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Sven Kerwath --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South AfricaThe presence of Southeast Asian walking catfish, Clarias batrachus, in Mauritian freshwater systems has been confirmed. Three female Clarias batrachus were caught in Rivière Sèche, close to the town of Phoenix, Mauritius (20°17′ S, 57°33′ E). This constitutes the first... -
Ecological conditions for spread of the invasive snail Physa marmorata (Pulmonata: Physidae) in the Ivory Coast
Item type: Journal Article • Journal: African Zoology • Authors: Y. K. Bony --- Université de Perpignan, France N. C. Kouassi --- Station de Recherche en Pisciculture, CNRA, Ivory Coast D. Diomandé --- Université d’Abobo-Adjamé, Ivory Coast G. Gourene --- Université d’Abobo-Adjamé, Ivory Coast M. Verdoit-Jarraya --- Université de Perpignan, France J. P. Pointier --- Université de Perpignan, FrancePhysa marmorata, originally described from the Lesser Antilles, was introduced into Africa before 1900 and has previously been reported from Bénin, Togo, Ghana, Nigeria and South Africa. Here we show that it is also common in temporary ponds, fish ponds,... -
Origin and putative colonization routes for invasive rodent taxa in the Democratic Republic of Congo
Item type: Journal Article • Journal: African Zoology • Authors: P. K. Kaleme --- Department of Botany and Zoology, South Africa J. M. Bates --- Department of Zoology, U.S.A. H. K. Belesi --- Department of Environment, Democratic Republic of Congo R. C. K. Bowie --- Museum of Vertebrate Zoology and Department of Integrative Biology, U.S.A. M. Gambalemoke --- Faculté des Sciences, Université de Kisangani, Democratic Republic of Congo J. Kerbis-Peterhans --- Department of Zoology, U.S.A. J. Michaux --- University of Liège, Belgium J. M. Mwanga --- Centre de Recherche en Sciences Naturelles, Democratic Republic of Congo B. R. Ndara --- Centre de Recherche en Sciences Naturelles, Democratic Republic of Congo P. J. Taylor --- Department of Ecology and Resource Management, South Africa B. Jansen van Vuuren --- Department of Botany and Zoology, South AfricaThe threat posed by biological invasions is well established. An important consideration in preventing the spread of invasives and also subsequent introductions lies in understanding introduction pathways. The Democratic Republic of the Congo (DRC) houses a large percentage of the... -
Assessing local scale impacts of Opuntia stricta (Cactaceae) invasion on beetle and spider diversity in Kruger National Park, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: M.P. Robertson --- Centre for Invasion Biology, Department of Zoology and Entomology, South Africa K.R. Harris --- Centre for Invasion Biology, Department of Zoology and Entomology, South Africa J.A. Coetzee --- Department of Zoology and Entomology, South Africa L.C. Foxcroft --- Conservation Services, South African National Parks, South Africa A.S. Dippenaar-Schoeman --- Plant Protection Research Institute, Agricultural Research Council, South Africa B.J. van Rensburg --- Centre for Invasion Biology, Department of Zoology and Entomology, South AfricaThere is a paucity of studies examining direct impacts of introduced alien species on biodiversity, a key need for motivating for alien species control in conservation areas. The introduced prickly pear (Opuntia stricta) has invaded some 35 000 ha of... -
First record of an introduction of the giant pangasius, Pangasius sanitwongsei Smith 1931, into an African river
Item type: Journal Article • Journal: African Zoology • Authors: Tuuli Mäkinen --- South African Institute for Aquatic Biodiversity, South Africa Olaf L. F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa Kerry-Ann van der Walt --- South African Institute for Aquatic Biodiversity, South Africa Ernst R. Swartz --- South African Institute for Aquatic Biodiversity, South AfricaA catfish captured in the Breede River (33°56 41.6”S 20°4’45.6”E) in South Africa was identified using morphological and genetic techniques as the giant pangasius, Pangasius sanitwongsei Smith 1931, a new record for South Africa. The wild-caught specimen was a genetic... -
Allelopathic effects of invasive Eucalyptus camaldulensis on germination and early growth of four native species in the Western Cape, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sheunesu Ruwanza --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa Mirijam Gaertner --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa Karen J Esler --- Centre for Invasion Biology, Department of Conservation Ecology and Entomology, South Africa David M Richardson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaEucalyptus camaldulensis Dehnh. (red river gum; Myrtaceae) is an invasive tree in riparian habitats of the Western Cape, South Africa, where it replaces indigenous vegetation and affects ecosystem functioning. These invasions lead to changes in river geomorphology and reduction in... -
An exposé ethnography of Zimbabwe's internally displaced ex-farm workers: Practical and ethical dilemmas
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Andrew Hartnack --- Department of Anthropology,From 2000 onwards, Zimbabwe's often violent land invasions displaced at least 500 000 farm workers from white-owned commercial farms across the country. While studies subsequently conducted on the land invasions tended to focus on their impact on farm workers who... -
Introduction, establishment and spread of the Southern mouthbrooder Pseudocrenilabrus philander in the Baakens River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Cuen Muller --- Zoology Department, South Africa Olaf LF Weyl --- South African Institute for Aquatic Biodiversity, South Africa Nadine A Strydom --- Zoology Department, South AfricaThis paper provides evidence for the extralimital establishment and spread of Pseudocrenilabrus philander in the Baakens River, Eastern Cape, South Africa. Since the first occurrence record at a single locality in 1994 this species has now spread throughout the river... -
Have grass carp driven declines in macrophyte occurrence and diversity in the Vaal River, South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSR Weyl --- Zoology and Entomology Department, South Africa GD Martin --- Zoology and Entomology Department, South AfricaThe Vaal River, South Africa, historically had a rich diversity of native submerged macrophytes with at least 13 species from 5 families recorded. Over the past 10 years there has been a noticeable reduction in the occurrence and diversity of... -
Back to the future: reflections and directions of South African marine bioinvasion research
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ME Alexander --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa CA Simon --- Department of Botany and Zoology, South Africa CL Griffiths --- Centre for Invasion Biology, Department of Biological Sciences, South Africa K Peters --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa S Sibanda --- Marine Programme, South Africa S Miza --- Marine Programme, South Africa B Groenewald --- Marine Programme, South Africa P Majiedt --- Marine Programme, South Africa KJ Sink --- Marine Programme, South Africa TB Robinson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaBiological invasions continue to increase around the world, with impacts on many coastal marine systems. Here we review the South African marine invasion literature which, despite the field being relatively new, has grown to have significant presence in both the... -
Lymphovascular space invasion in early-stage endometrial cancer: adjuvant treatment and patterns of recurrence
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Esther van Barneveld --- Department of Obstetrics and Gynaecology, The Netherlands David G Allen --- Department of Obstetrics and Gynaecology, Australia Ruud LM Bekkers --- Department of Obstetrics and Gynaecology, The Netherlands Peter T Grant --- Department of Obstetrics and Gynaecology, AustraliaBackground: In early-stage endometrial cancer, lymphovascular space invasion (LVSI) is an independent predictor of relapse of disease and poorer survival. Nevertheless, adjuvant treatment for LVSI-positive patients is variable. -
Soil seed bank depletion as a mechanism of Lantana camara L. invasion
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sheunesu Ruwanza --- Department of Environmental Science, South AfricaLantana camara is an invasive plant in South Africa with a wide range of impacts. This study assessed the impact of L. camara invasion on the soil seed bank. The study asked the question, does species density and diversity of... -
The abundance of an invasive freshwater snail Tarebia granifera (Lamarck, 1822) in the Nseleni River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RW Jones --- Department of Zoology and Entomology, South Africa JM Hill --- Department of Zoology and Entomology, South Africa JA Coetzee --- Department of Botany, South Africa TS Avery --- Department of Biology and Mathematics & Statistics, Canada OLF Weyl --- Centre for Invasion Biology, South Africa MP Hill --- Department of Zoology and Entomology, South AfricaThe invasive freshwater snail Tarebia granifera (Lamarck, 1822) was first reported in South Africa in 1999 and it has become widespread across the country, with some evidence to suggest that it reduces benthic macroinvertebrate biodiversity. The current study aimed to... -
Assessing effect of rainfall on rate of alien shrub expansion in a southern African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Mhosisi Masocha --- Department of Geography and Environmental Science, Faculty of Science, Zimbabwe Timothy Dube --- Department of Geography and Environmental Studies, South Africa Andrew Skidmore --- Faculteit Geo-Informatie Wetenschappen en Aardobservatie, The Netherlands Milena Holmgren --- Resource Ecology Group, The Netherlands Herbert Prins --- Resource Ecology Group, The NetherlandsUnderstanding the environmental factors governing the spread of alien shrubs is crucial for conserving biodiversity. In the semi-arid savannas of Africa, alien shrub invasion often occurs simultaneously with native shrub encroachment but climate-dependent differences in encroachments of native and alien... -
No evidence for avoidance of black rat scent by the presumably less competitive Natal multimammate mouse in a choice experiment
Item type: Journal Article • Journal: African Zoology • Authors: Laura N Cuypers --- Evolutionary Ecology Group, Belgium Wim L Cuypers --- Evolutionary Ecology Group, Belgium Amélie Gildemyn-Blomme --- Evolutionary Ecology Group, Belgium Laura Abraham --- Evolutionary Ecology Group, Belgium Senne Aertbeliën --- Evolutionary Ecology Group, Belgium Apia W Massawe --- Pest Management Centre, Tanzania Benny Borremans --- Evolutionary Ecology Group, Belgium Sophie Gryseels --- Evolutionary Ecology Group, Belgium Herwig Leirs --- Evolutionary Ecology Group, BelgiumIn Africa, indigenous multimammate mice (Mastomys natalensis) only appear to live commensally in houses when invasive black rats (Rattus rattus) are absent, yet little is known about the underlying mechanism. Avoidance through smell may cause the absence of M. natalensis... -
Reassessing the invasion of South African waters by the European shore-crab Carcinus maenas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Mabin --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JRU Wilson --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JJ Le Roux --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa TB Robinson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaThe European shore-crab Carcinus maenas has been present in South Africa since 1983. Despite this species’ international reputation as a biological invader, its distribution in this region has only been considered by three outdated ‘snapshot surveys.’ The present study is... -
Perioperative echocardiography for invasive thymoma with intracardiac invasion in a child: a case report
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Megan Sanders --- Department of Anaesthesiology, South Africa Ahmad Alli --- Department of Anaesthesiology, South AfricaIn the paediatric population, thymomas are rare mediastinal tumours. Surgical management is the main treatment for these tumours. A case of an aggressive thymoma with intracardiac invasion in a child is presented. The management plan involved either resection of the... -
Contrasting invasion patterns in intertidal and subtidal mussel communities
Item type: Journal Article • Journal: African Zoology • Authors: Lisa Skein --- Department of Botany and Zoology, South Africa Mhairi Alexander --- School of Science and Sport, UK Tamara Robinson --- Department of Botany and Zoology, South AfricaTwo invasive mussel species are known from South Africa, Mytilus galloprovincialis and Semimytilus algosus. Most of the existing research on these invaders has focused on the intertidal zone, with little attention paid to subtidal habitats. This study addresses this knowledge... -
Record of Blue tilapia Oreochromis aureus (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa G Gouws --- South African Institute for Aquatic Biodiversity, South Africa S Avlijas --- Redpath Museum, Canada D Khosa --- South African Institute for Aquatic Biodiversity, South Africa ND Impson --- Scientific Services, South Africa M van der Westhuizen --- Conservation Services, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity, South AfricaOreochromis aureus was imported from Israel into South Africa in 1959 but data on its current status in South Africa are lacking. Genomic DNA was extracted and the COI gene amplified at the South African Institute for Aquatic Biodiversity. The... -
Horizon scanning for alien predatory crabs: insights from South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Swart --- Department of Botany and Zoology, South Africa TB Robinson --- Department of Botany and Zoology, South AfricaDue to the presence of few dominant predators on South African rocky shores, this coastline could be vulnerable to invasion by predatory crabs. This study applied horizon scanning to create an ordered watch list of alien crab species that could... -
The diet and trophic ecology of non-native Micropterus salmoides in two South African impoundments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC Taylor --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JM Hill --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaLargemouth bass Micropterus salmoides is a highly successful predator that preys on fish and invertebrates. Highly popular with anglers, it is one of the most introduced and invasive fish globally, with strong potential to alter ecosystem structure and functioning. A... -
First record of Labeo capensis (Smith, 1841) in the Crocodile River (West) system: another successful non-native freshwater fish introduction in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JH Erasmus --- Water Research Group, Unit for Environmental Sciences and Management, South Africa W Malherbe --- Water Research Group, Unit for Environmental Sciences and Management, South Africa R Gerber --- Water Research Group, Unit for Environmental Sciences and Management, South Africa OLF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa B Sures --- Aquatic Ecology and Centre for Water and Environmental Research, Germany V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa NJ Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaSouth Africa is one of six global fish invasion hotspots and as a result, non-native fishes are common components of the fish assemblages in all of the major river systems. The rate of establishment for introduced fish into South African... -
Implications of geographical range changes and resultant sympatry for three Accipiter hawks on the Cape Peninsula, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Robin M Little --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Rene A Navarro --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaSome invasive species are known to compete with and even displace indigenous species. Two Accipiter species historically indigenous to eastern South Africa have colonised the Cape Peninsula in the south-west of the country and have become sympatric with a third... -
Vachellia sieberiana var. woodii, a high-altitude encroacher: the effect of fire, frost, simulated grazing and altitude in north-western KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jennifer M Russell --- School of Life Sciences, South Africa Michelle J Tedder --- School of Life Sciences, South Africa Stuart Demmer --- School of Life Sciences, South AfricaSavannas and grasslands throughout the world are experiencing bush encroachment, which has serious consequences for net primary productivity. In South Africa, Vachellia sieberiana is encroaching into the savannas and high-altitude grasslands of KwaZulu-Natal. We investigated the role of fire, frost... -
Debarking damage by alien Pallas’s squirrel, Callosciurus erythraeus, in Argentina and its effects on tree growth
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Paula A Pedreira --- , Argentina Eduardo A Penon --- , Argentina Mariela Borgnia --- , ArgentinaIntroduced squirrels threaten forest ecosystems by debarking, resulting in economic losses to the timber industry and additional damage mitigation and pest control costs. The Pallas’s squirrel, also called the red-bellied squirrel. (Callosciurus erythraeus), originally from Asia, is the first squirrel... -
Tarantulas (Araneae: Theraphosidae) in the pet trade in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Tinyiko C Shivambu --- , South Africa Ndivhuwo Shivambu --- , South Africa Robin Lyle --- , South Africa Adriaana Jacobs --- , South Africa Sabrina Kumschick --- , South Africa Stefan H Foord --- , South Africa Mark P Robertson --- , South AfricaMany alien species have been introduced around the world as part of the pet trade, and some have escaped captivity and become invasive. In South Africa, many species of tarantula (Theraphosidae) are kept as pets. It is not known which... -
Status of a decennial marine invasion by the bisexual mussel Semimytilus algosus (Gould, 1850) in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KCK Ma --- , South Africa CD McQuaid --- , South Africa A Pulfrich --- , South Africa TB Robinson --- , South AfricaThe invasion history and current distribution of the alien marine mussel, the bisexual mussel Semimytilus algosus, on rocky shores of South Africa is described in this study. The eastern edge of its distribution has been monitored since 2014, and the... -
Spatial and temporal diversity of non-native biofouling species associated with marinas in two Angolan bays
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LB Pestana --- , Brazil GM Dias --- , Brazil AC Marques --- , BrazilArtificial structures in coastal areas provide substrates which facilitate the spread of non-native species. Published records of introduced benthic species in the coastal waters of Angola are scarce, and so far these have numbered 29 non-native species and seven cryptogenic... -
The wheat curl mite (Aceria tosichella, Prostigmata: Eriophyidae) could establish in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Tamryn S Venter --- , South Africa Mark P Robertson --- , South Africa Davina L Saccaggi --- , South Africa Katelyn T Faulkner --- , South AfricaBiological invasions by agricultural pests can have serious negative impacts, including decreases in crop yield and economic losses. The MT-1 and MT-8 genotypes of the wheat curl mite (Aceria tosichella) (hereafter ‘WCM’ refers to these two genotypes) are globally distributed... -
Habitat structure differentially mitigates predation impact of juvenile largemouth bass and Florida bass
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Dumisani Khosa --- , South Africa Josie South --- , South Africa Ryan J Wasserman --- , South Africa Olaf LF Weyl --- , South AfricaHabitat complexity plays an important role in structuring species diversity, behaviour and distribution. Furthermore, habitat complexity can mediate the strength of predator-prey interactions through the provision of prey refugia or through enhancing ambush predation. In this study, we use functional... -
Dropping plates to pick up aliens: towards a standardised approach for monitoring alien fouling species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TG Loureiro --- , South Africa K Peters --- , South Africa TB Robinson --- , South AfricaBiological invasions pose a major threat to biodiversity and significant investment is required to prevent the introduction of alien species, contain introduced populations and mitigate associated impacts. The implementation of standardised long-term monitoring programmes enables the early identification of new... -
Comparative avifaunal richness and diversity in invasive Acacia dealbata patches and adjacent montane grasslands
Item type: Journal Article • Journal: African Zoology • Authors: Jessica Seath --- , South Africa Charlie Shackleton --- , South AfricaInvasive alien species are regarded as the second greatest threat to biodiversity globally. Yet, at a local scale their effects may vary, underlying the requirement for more local-scale studies across taxa and settings. Here we consider the effects of an... -
Disaggregation and assessment of estuarine pressures at the country-level to better inform management and resource protection – the South African experience
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L van Niekerk --- , South Africa S Taljaard --- , South Africa SJ Lamberth --- , South Africa JB Adams --- , South Africa SP Weerts --- , South Africa CF MacKay --- , South AfricaGlobally, the ability of estuaries to sustain functionality and productivity is deteriorating rapidly under ever-increasing anthropogenic pressures. We present a systematic approach to identify, characterise and rank global pressures affecting estuaries. Six main pressure categories are reviewed: freshwater flow modification;... -
Colonisation theory and invasive biota: the Great Fish River case history, 35 years later
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Pule P Mpopetsi --- Rhodes University, South Africa Wilbert T Kadye --- Rhodes University, South AfricaUsing the Great Fish River, South Africa, Laurenson and Hocutt (1986) proposed a colonisation theory outlining the characteristics of successful invaders and the properties of aquatic habitats that facilitate successful fish invasions. The Great Fish River has modified flow due... -
Grazing capacity change on a small Mediterranean-type South African offshore island following the control of invasive alien European rabbits (Oryctolagus cuniculus)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: --- University of KwaZulu-Natal, South Africa --- University of KwaZulu-Natal, South Africa --- Stellenbosch University, South AfricaInvasive alien species (IAS) are one of the most important factors driving extinction rates worldwide. Among the IAS, the impacts of introduced mammals on native biodiversity are most severe, with the European rabbit (Oryctolagus cuniculus) being the most problematic. Globally,... -
A review of the reported and future potential ecological impacts of the invasive freshwater snail Tarebia granifera in South Africa.
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JJ Pearson --- North-West University, South Africa R Gerber --- North-West University, South Africa W Malherbe --- North-West University, South Africa NJ Smit --- North-West University, South Africa L de Necker --- North-West University, South AfricaThe Southeast Asian gastropod Tarebia granifera is an invasive freshwater snail across several continents. Our review summarises the impacts of this invasive snail on invaded aquatic ecosystems. The most important impacts are those related to their ability to reproduce quickly... -
DNA-based species identification as a tool to distinguish invasive Nassella species in South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony Mapaura --- University of the Free State, South Africa Kim Canavan --- University of the Free State, South Africa David M Richardson --- Stellenbosch University, South Africa Nicholas C Le Maitre --- Stellenbosch University, South Africa V Ralph Clark --- University of the Free State, South Africa Sandy-Lynn Steenhuisen --- University of the Free State, South AfricaThe three non-native Nassella species (N. neesiana, N. tenuissima, and N. trichotoma) occurring in the South African montane grasslands are morphologically cryptic, and hence difficult to distinguish from several taxonomically complex, co-occurring tufted C3 perennial grass genera (e.g. Festuca), and... -
Aggressive interactions by invasive Common Mynas Acridotheres tristis with urban birds in Pretoria, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Robyn Nelson --- University of Pretoria, South Africa Michael J Somers --- University of Pretoria, South AfricaWe conducted transect surveys in urban Pretoria, South Africa, to document interspecific interactions involving the invasive Common Myna Acridotheres tristis and coexisting species. During 90 standardised transect surveys across three suburban sites from April to August 2022 (outside the main...