This archive of reports of wildlife surveys in Namibia aims to:
Public access to information is a vital component of ensuring community engagement in prevalent issues. Wildlife surveys are critical to determine the health of wildlife populations and determine trends over time to guide conservation and management actions.
Wildlife surveys are done for different species using methods that are suited to counting them (e.g. by air or road) in their natural habitats. Such surveys need to be repeated over time to detect long-term trends and inform conservation managers. The Namibian government, non-governmental organisations and private reserves all conduct regular surveys covering different parts of Namibia and targeting different species. This archive will thus serve as a repository of our collective knowledge of the trends and status of a variety of species occurring throughout Namibia.
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Namibia's elephants extend across the north of the country. They occur in six main areas of the known Namibian range - the north-west, Etosha National Park (NP), Mangetti National Park, northern Kavango, Khaudum National Park/Nyae Nyae Conservancy and Zambezi Region. Seasonal changes in distribution are related to water availability. There are movements of elephants between Namibia and its neighbours, particularly Botswana, and mainly from Zambezi Region. The largest populations are found in the north-east of the country, in Khaudum/Nyae Nyae and Zambezi Region.
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Namibias elephants_population_distribution and trends.pdf | 2.21 MB |
Robust abundance estimates of wild animal populations are needed to inform management policies and are often obtained through mark–recapture (MR) studies. Visual methods are commonly used, which limits data collection to daylight hours and good weather conditions. Passive acoustic monitoring offers an alternative, particularly if acoustic cues are naturally produced and individually distinctive. Here we investigate the potential of using individually distinctive signature whistles in a MR framework and evaluate different components of study design.
Knowledge of a population’s abundance is of primary importance for conservation management. However, robust estimates of abundance are often difficult to obtain, especially for cetaceans which spend most of their lives submerged. Cetacean abundance is commonly estimated using aerial or vessel-based line transect surveys and distance sampling methods. During 2012–2014, the first line transect surveys to estimate cetacean abundance were conducted in Namibian waters.
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First Abundance Estimates of Heavisides and Dusky Dolphin off Namibia.pdf | 5.23 MB |
Knowledge of the occurrence and distribution of cetaceans is particularly important for conservation and management, but is still limited within Namibian waters. We collated 3211 cetacean records from the Namibian Exclusive Economic Zone (EEZ) for the period 2008 to 2016 and applied the principle of minimum cross entropy (MinxEnt) to predict habitat suitability. MinxEnt is a generalised form of maximum entropy modelling that allows incorporation of additional information such as sampling bias.
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Predicting large_scale habitat suitability for cetaceans off Namibia using MinxEnt.pdf | 2.91 MB |
The 2019 aerial survey of wildlife in Khaudum National Park and Neighbouring Areas, Namibia, was commissioned by KfW on behalf of the Directorate of Scientific Services, Ministry of Environment and Tourism (MET), Government of Namibia as part of the survey of elephants in north-eastern Namibia.
The coastal population of common bottlenose dolphins Tursiops truncatus found in Namibia is regionally isolated and unique. This population faces several potential anthropogenic threats, especially in Walvis Bay, including boat-based tourism, a commercial harbour undergoing expansion, and aquaculture for oysters and mussels. Between 2008 and 2012, 238 boat-based surveys were conducted, resulting in 170 encounters with bottlenose dolphins. Overall, group sizes varied from 1 to 45 individuals (mean 10.7).
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Tursiops truncatus in Walvis Bay.pdf | 2.67 MB |
An aerial survey of wildlife and domestic livestock took place in Zambezi Region from 25 th September to 4 th October 2019 as part of a wider survey including Khaudum National Park and its neighbouring conservancies. A total area of 17 380km2 was sampled at intensities between 10 and 40%. The estimates of numbers of each species are tabulated below. The estimated number of elephants is lower than that from the 2015 survey, but the change is not statistically significant. There were considerably fewer elephant carcasses seen in 2019.
An aerial survey of wildlife and domestic livestock took place in the Khaudum National Park and its neighbouring areas from 18th to 23th September 2019 as part of a wider survey including Zambezi Region. A total area of 14029 km2 was sampled at intensities from 5% to 20%. The estimated numbers of numbers of each species are given in the table below. The increase in estimated numbers of elephants since 2013 has been greater than expected from natural reproduction, but the overall trend from 1998 shows an average rate of increase of 4.4% per annum.
Recently introduced unmarked spatial capture–recapture (SCR), spatial mark–resight (SMR), and 2-flank spatial partial identity models (SPIMs) extend the domain of SCR to populations or observation systems that do not always allow for individual identity to be determined with certainty. For example, some species do not have natural marks that can reliably produce individual identities from photographs, and some methods of observation produce partial identity samples as is the case with remote cameras that sometimes produce single-flank photographs.
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SCR for categorically marked populations with an application to genetic capture_recapture.pdf | 2.75 MB |
An aerial survey of elephants and other animals was conducted in North West Namibia from 16th September to 8 th October 2016. A total area of 63431km2 was sampled at an average intensity of 8.19% using both transects (at an average of 6.7% sample intensity) and block counts (9.88% sample intensity). Total counts were conducted additionally by flying 921.5km along six rivers.
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Aerial survey of elephants and other animals in north western Namibia.pdf | 8.93 MB |
An aerial survey of wildlife and domestic livestock took place in Zambezi Region from 25 th September to 4 th October 2015. A total area of 17474km2 was sampled at an average intensity of 13%. The estimates of numbers of each species are tabulated below. The number of elephants estimated has decreased since the 2014 survey, although the change is notstatistically significant. However there has been a very highly significant increase in the estimated number of elephant carcasses since 2014. Other observations suggest that illegal hunting of elephants continues to take place in the…
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Aerial survey of elephants and other wildlife in Zambezi Region_September_October 2015.pdf | 5.82 MB |
An aerial survey of wildlife and domestic livestock took place in the Khaudum National Park and its neighbouring conservancies from 6 th to 14 th October 2015. A total area of 12851km2 was sampled at an average intensity of 9%. The focus of the survey was on obtaining good estimates of elephant numbers. Other species were recorded although it is likely that their numbers would be underestimated (Craig and Gibson, 2013a).
The 2014 aerial survey of wildlife in Zambezi Region (formerly Caprivi Region) was conducted between 25 September and 4 October 2014. While the main emphasis was on numbers and distributions of elephants and elephant carcasses, sightings of other species were recorded as well as sightings of illegal activities and human settlements. The survey was conducted according to standard practices using stratified systematic transect sampling (Norton Griffiths, 1978) in a light aircraft (a Cessna 182) flying at a nominal height of 300 feet above the ground.
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Report Zambezi region 2014 aerial survey.pdf | 5.32 MB |
An aerial survey of wildlife and domestic livestock took place in Zambezi Region from 25th September to 4th October 2014. A total area of 11713 km2 was sampled at an average intensity of 14%.
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Aerial survey of elephants and other wildlife in Zambezi Region_September_October 2014.pdf | 5.32 MB |
An aerial survey of wildlife and domestic livestock took place in the Caprivi from 29 May to 8 June 2013. A total area of 16733 km2 was sampled at an average intensity of 12.7%. The estimates of numbers of each species (with their 95% confidence range) are given in the table below. The population of elephants has increased at an average rate of between 1.4% and 8.3%.per annum. However, the ratio of carcasses to live elephants indicates a possibly unsustainable number of animals being killed in much of the Caprivi.
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Aerial survey of elephants and other wildlife in the Caprivi May_June 2013.pdf | 3.73 MB |
An aerial survey of wildlife and domestic livestock took place in the Khaudum National Park and surrounding conservancies from 17th to the 22nd September 2013. A total area of 15200 km2 was sampled at an average intensity of 7.1%.
The objective of this survey was to obtain a national estimate for elephants in Namibia. Fieldwork took place between 29 July and 11 August 2011 (Etosha and Tsumkwe), 6 to 10 September 2011 (Caprivi) and 19 to 25 November 2011 (Northwest Namibia). Areas covered are shown in Figs 1-3. The survey was a sample count at a variety of sampling intensities, depending on assumed elephant densities, in order to obtain a reasonably precise estimate with minimal effort. NW Namibia was a block-sample count flown by helicopter (with some areas of known high occupancy being total-counted).
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Countrywide survey of elephants in Namibia_2011.pdf | 1.22 MB |
An assessment of population size is a fundamental stage in the conservation of any species. The recent availability of data from the Southern African Bird Atlas Project (SABAP) provides a tool to investigate the status and distribution of approximately 900 bird species covered by this work. Here, we assess whether or not reporting rate can be used to establish absolute abundance and thereby produce estimates of population size.
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Can Bird Atlas data be used to estimate population size.doc | 634.5 KB |