Danny Govender

Danny Govender
South African National Parks · Scientific Services

BVSc, MSc

About

74
Publications
15,878
Reads
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785
Citations
Citations since 2016
53 Research Items
613 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
Skills and Expertise

Publications

Publications (74)
Article
Game parks are the last preserve of many large mammals, and in savanna ecosystems, management of surface waters poses a conservation challenge. In arid and semi-arid regions, water can be a scarce resource during dry seasons and drought. Artificial waterholes are common in parks and reserves across Africa, but can alter mammal community composition...
Article
Full-text available
Herbivores are a main driver of ecosystem patterns and processes in semi-arid savannas, with their effects clearly observed when they are excluded from landscapes. Starting in the 1960s, various herbivore exclosures have been erected in the Kruger National Park (KNP), for research and management purposes. These exclosures vary from very small (1 m2...
Article
Full-text available
The combined use of global positioning system (GPS) technology and motion sensors within the discipline of movement ecology has increased over recent years. This is particularly the case for instrumented wildlife, with many studies now opting to record parameters at high (infra-second) sampling frequencies. However, the detail with which GPS logger...
Article
Full-text available
Background Understanding what animals do in time and space is important for a range of ecological questions, however accurate estimates of how animals use space is challenging. Within the use of animal-attached tags, radio telemetry (including the Global Positioning System, ‘GPS’) is typically used to verify an animal’s location periodically. Strai...
Article
Feline immunodeficiency virus (FIV) is a pathogenic lentivirus related to human and simian immunodeficiency viruses that has been associated with AIDS-like pathologies in domestic and wild cats, as well as in hyenas. Despite known pathologies, progressive immunosuppression and ill health effects driven by these lentiviruses in association with othe...
Article
Full-text available
Feline immunodeficiency virus (FIV) is a pathogenic lentivirus related to human and simian immunodeficiency viruses that has been associated with AIDS-like pathologies in domestic and wild cats, as well as in hyenas. Despite known pathologies, progressive immunosuppression and ill health effects driven by these lentiviruses in association with othe...
Article
Full-text available
Background Fine-scale data on animal position are increasingly enabling us to understand the details of animal movement ecology and dead-reckoning, a technique integrating motion sensor-derived information on heading and speed, can be used to reconstruct fine-scale movement paths at sub-second resolution, irrespective of the environment. On its own...
Preprint
Full-text available
The combined use of Global Positioning System (GPS) technology and motion sensors within the discipline of movement ecology has increased over recent years. This is particularly the case for instrumented wildlife, with many studies now opting to record parameters at high (infra-second) sampling frequency. However, the detail with which GPS loggers...
Preprint
Full-text available
Background Understanding what animals do in time and space is important for a range of ecological questions, however accurate estimates of how animals use space is challenging. Within the use of animal-attached tags, radio telemetry (including the Global Positioning System (GPS)) is typically used to verify an animal’s location periodically. Straig...
Article
Full-text available
Reflecting their species richness and ecological diversification, insects play a central role in terrestrial ecosystems but difficulties in species-level assignments have restricted large-scale analysis of their community structure. Employing South Africa's largest national park as a model system, we demonstrate that DNA barcoding can break this ba...
Article
Full-text available
Background: Although the Kruger National Park (KNP) is a protected area, it is not exempted from anthropogenically induced impacts, which often compromise river water flow and quality. Measures of river water quality in South Africa have conventionally been based on water chemistry as well as different ecological indicator groups such as fish and m...
Preprint
Full-text available
Background Fine-scale data on animal position are increasingly enabling us to understand the details of animal movement ecology and dead-reckoning, a technique integrating motion sensor-derived information on heading and speed, can be used to reconstruct fine-scale movement paths at sub-second resolution, irrespective of the environment. On its own...
Article
Full-text available
Despite being a parasitic disease known since ancient times, some epidemiological aspects of cystic echinococcosis (CE) remain unclear. Many studies describe its prevalence and genotyping in populations of domestic animals and livestock, but data regarding wildlife are often scarce and incomplete. The available literature suggests that CE has never...
Article
Full-text available
Human activities such as agriculture and mining are leading causes of water pollution worldwide. Individual contaminants are known to negatively affect microbial communities. However, the effect of multifaceted pollution on these communities is less well understood. We investigated, using next-generation sequencing of the 16S rRNA genes, the effect...
Preprint
Full-text available
The analysis of waterborne environmental DNA (eDNA) is effective for detecting invasive species and conducting large-scale biodiversity assessments, making it a potentially powerful tool for documenting diversity at sites where large numbers of species aggregate. We explore the utility of eDNA from waterholes for describing local mammal communities...
Article
Mass Nile crocodile (Crocodylus niloticus) deaths in Africa’s premier conservation area, the Kruger National Park (KNP), prompted numerous studies to determine possible causes of the sudden die-offs. The majority highlighted the involvement of the anthropocene to crocodile mass mortalities. One of the potential causative agents was identified as le...
Article
Full-text available
Humans alter the environment at unprecedented rates through habitat destruction, nutrient pollution and the application of agrochemicals. This has recently been proposed to act as a potentially significant driver of pathogen-carrying mosquito species (disease vectors) that pose a health risk to humans and livestock. Here, we use a unique set of loc...
Conference Paper
Cystic echinococcosis (CE) is a zoonosis caused by the larval stage of the species complex of Echinococcus granulosus sensu lato (s. l.). This disease still represents a major public health concern worldwide and is currently among the five most frequently reported parasitic zoonoses. The genetic diversity of E. granulosus is considerably high and h...
Article
In contrast to other game species and domestic livestock, there is a paucity of evidence concerning yields and thus meat obtained from the African savanna buffalo (Syncerus caffer caffer ). The aim of our study was to investigate the effects of age (categorized) and sex on buffalo carcass yields. Towards this goal, male (n = 17) and female (n = 13)...
Article
Full-text available
Avian botulism has been reported in many areas worldwide, particularly in North America, where at times it has resulted in die-offs of hundreds of thousands of waterbirds. By contrast, there are few reported cases in wild waterbird communities in South Africa. Mass die-offs of waterbirds in the Wilderness Lakes, South Africa, were first observed in...
Article
Full-text available
Background: Assessing adult mosquito populations is an important component of disease surveillance programs and ecosystem health assessments. Inference from adult trapping datasets involves comparing populations across space and time, but comparisons based on different trapping methods may be biased if traps have different efficiencies or sample d...
Article
Full-text available
The Kruger National Park (KNP) is a savanna ecosystem situated in the middle reaches of five large, dynamic and biologically diverse transboundary river systems. The KNP has been at the forefront of applied river ecosystems research for over 30 years. Meanwhile each of its rivers has a unique set of challenges from both a river flow and water quali...
Article
Full-text available
Sixteen Nile crocodiles were collected in the Kruger National Park, South Africa and vicinity during 2010 and 2011. A total of 11 nematode species representing six families were recovered. Heterocheilids were the dominant group, comprising five species, with Dujardinascaris madagascariensis (Chabaud & Caballero, 1966) being the most prevalent (75%)...
Preprint
Background: Assessing adult mosquito populations is an important component of disease surveillance programs and ecosystem health assessments. Inference from adult trapping datasets involves comparing populations across space and time, but comparisons based on different trapping methods may be biased if traps have different efficiencies or sample di...
Article
Full-text available
Background Mosquito population dynamics are driven by large-scale (e.g. climatological) and small-scale (e.g. ecological) factors. While these factors are known to independently influence mosquito populations, it remains uncertain how drivers that simultaneously operate under natural conditions interact to influence mosquito populations. We, theref...
Article
Bacteria are essential components of natural environments. They contribute to ecosystem functioning through roles as mutualists and pathogens for larger species, and as key components of food webs and nutrient cycles. Bacterial communities respond to environmental disturbances, and the tracking of these communities across space and time may serve a...
Article
Measuring contemporary dispersal in highly mobile terrestrial species is challenging, especially when species are characterized by low levels of population differentiation. Directly transmitted viruses can be used as a surrogate for traditional methods of tracking host movement. Feline Immunodeficiency Virus (FIV) is a species‐specific lentivirus,...
Poster
Full-text available
The Nile Crocodile (Crocodylus niloticus), Leatherback Turtle (Dermochelys coriacea), and the Loggerhead Turtle (Caretta caretta) are the largest reptiles in Africa. The Nile Crocodile and Loggerhead Turtle are also at relatively high trophic levels, with the Nile Crocodile being the largest predator in Africa. We collected eggs from these three...
Article
The Nile Crocodile is the largest predator on the African continent. Recent mass mortalities in the Kruger National Park (KNP) raised concerns about possible influence of pollution. We analysed eggs and their eggshells collected from nests inside the KNP and from a crocodile farm for metallic elements. We found that mercury, selenium, and copper oc...
Article
The International Species Information System has set forth an extensive database of reference intervals for zoologic species, allowing veterinarians and game park officials to distinguish normal health parameters from underlying disease processes in captive wildlife. However, several recent studies comparing reference values from captive and free-r...
Article
Full-text available
The objectives of the study were to determine the species composition of ticks infesting white and black rhinoceroses in southern Africa as well as the conservation status of those tick species that prefer rhinos as hosts. Ticks were collected opportunistically from rhinos that had been immobilised for management purposes, and 447 white rhinocerose...
Article
Full-text available
Thirty-two specimens of the Nile crocodile, Crocodylus niloticus Laurenti (Reptilia: Crocodylidae), from the Kruger National Park, South Africa, and its vicinity were examined for pentastomid parasites during 1995 to 1999 and 2010 to 2011. Pentastomid parasites occurred throughout the year and were widespread in the study area with an overall preva...
Article
Full-text available
Over the past decade, several clustered, multispecies, wildlife mortality events occurred in the vicinity of two man-made earthen dams in the southern and south central regions of the Kruger National Park, South Africa. On field investigation, heavy cyanobacterial blooms were visible in these impoundments and analysis of water samples showed the do...
Article
Full-text available
One of the largest river systems in South Africa, the Olifants River, has experienced significant changes in water quality due to anthropogenic activities. Since 2005, there have been various "outbreaks" of the inflammatory disease pansteatitis in several vertebrate species. Large-scale pansteatitis-related mortality events have decimated the croco...
Data
Summarized trial examination of blood chemistry analysis using species-matched (tilapia) QC sample (n = 7). (DOCX)
Data
Blood chemistry values for SRM 1950 and comparison to noted NIST concentrations. (DOCX)
Data
2014 Mozambique tilapia (Oreochromis mossambicus) morphometric information. (DOCX)
Data
Summarized male tilapia blood chemistry parameters using the blood chemistry analyzer. (DOCX)
Data
Surface plots for the top four predictive parameters (Ca2+, Na+, ALB, and TP) in relation to standard deviation and total length (with the other three parameters were clamped). TP (g/dL), ALB (g/dL), Na+ (mmol/L), and Ca2+ (mg/dL). (DOCX)
Data
Summarized female tilapia blood chemistry parameters using the blood chemistry analyzer. (DOCX)
Data
Summarized examination of SRM 1950 using a blood chemistry analyzer (n = 7). (DOCX)
Article
Mass mortality of Nile crocodile (Crocodylus niloticus) occurred in the Olifants River of the Kruger National Park (KNP) in 2008 from pansteatitis, a condition in which body fat becomes yellow and inflamed. Much research has been carried out, but the cause(s) of the outbreak in the KNP remains unknown. Anthropogenic factors such as heavy metal poll...
Article
Full-text available
Background Anopheles arabiensis Patton is primarily responsible for malaria transmission in South Africa after successful suppression of other major vector species using indoor spraying of residual insecticides. Control of An. arabiensis using current insecticide based approaches is proving difficult owing to the development of insecticide resistan...
Conference Paper
Full-text available
Despite its threat to avian diversity, little information is known about avian haemo- and ectoparasite prevalence especially in Africa. Avian malarial haemoparasites (Haemoproteus, Plasmodium, and Leucocytozoon spp) cause anaemia in bird populations across six continents. Due to the massive scope of this disease, understanding factors that affect a...
Article
Full-text available
The African Penguin population has drastically declined over the last 100 years. Changes in food availabil-ity due to over-fishing and other oceanographic changes seem to be major causes. However, it has also been 30 years since organic pollutants as a potential factor have been assessed. We analysed penguin eggs collected in 2011 and 2012 from two...
Article
Full-text available
Repeated annual episodes of Nile crocodile deaths in two isolated areas of the Kruger National Park prompted the investigation of possible organohalogen pollutant involvement. Crocodile eggs were collected close to one of the mortality sites (Gorge) as well as from a crocodile farm (CF) as reference. ∑DDT was significantly higher in Gorge (450ng/g...
Article
Full-text available
Knowledge of the ecology and behaviour of a target species is a prerequisite for the successful development of any vector control strategy. Before the implementation of any strategy it is essential to have comprehensive information on the bionomics of species in the targeted area. The aims of this study were to conduct regular entomological surveil...
Article
Full-text available
Annual mortality events in Nile crocodiles (Crocodylus niloticus) in the Olifants River Gorge in Kruger National Park, South Africa, were experienced between 2008 and 2012, during which at least 216 crocodiles died. Live crocodiles were lethargic. Necropsy examination of 56 affected crocodiles showed dark yellow-brown firm nodules in both somatic f...
Conference Paper
Full-text available
H. Bouwman*1, D. Govender2, L.G. Underhill3, A. Polder4 1North-West University, Potchefstroom, South Africa; 2SANParks, Skukuza, South Africa; 3University of Cape Town, Cape Town, South Africa; 4The Norwegian School for Veterinary Sciences, Oslo, Norway. henk.bouwman@nwu.ac.za Levels of pollutants in penguin eggs from the Antarctic are relatively w...
Article
Pansteatitis has been identified in wild populations of sharptooth catfish, Clarias gariepinus (Burchell), and Nile crocodiles, Crocodylus niloticus Laurenti, inhabiting the same waters in the Olifants River Gorge in the Kruger National Park, South Africa. Mesenteric and pectoral fat tissue was investigated microscopically and by fatty acid analysi...