Eivin Røskaft

Norwegian University of Science and Technology | NTNU · Department of Biology

In the Anthropocene era, securing protected areas (PAs) has become an important strategy to conserve biodiversity and sustain ecosystem services. However, insufficient integration of social aspects in the management of PAs and failure to consider the rights and potential contributions of impacted communities often result in conservation conflicts a...

Hunting and illegal bird killing are major concerns for avian conservation globally. Unsustainable bird hunting in wetland habitats, particularly those located along important flyways, has contributed to avifauna defaunation and species endangerment. Since wetlands are primary habitats for migratory birds and are associated with anthropogenic lands...

Since the 1990s, the number of lions ( Panthera leo ) has declined by about 43% across African range states. Reliable lion population estimates can contribute to effective management and inform local and international conservation policies. Though many survey methods have been used to estimate lion abundance, an assessment of their usefulness and e...

Roads within protected areas facilitate management and tourism but can also alter animal movements and foraging opportunities. Animal tracks observed along roads are also used to index species distributions and abundance. We investigated the influence of roads on lion (Panthera leo) movements within the Serengeti ecosystem of Tanzania. We used hour...

Humans' and elephants' conflict is considered a common phenomenon in Bangladesh due to extreme anthropogenic interferences on elephant habitats. Concurrently, the landless people were encouraged to encroach on forest land due to their financial hardship and poor and weak forest management systems. We conducted our research work through frequent fie...

Land use, habitat suitability, and seasonality can fundamentally shape small-mammal abundance, species richness, diversity, evenness, and composition. However, how these characteristics of small mammals are determined by land use, habitat type, and rainfall seasonality is still poorly understood for most ecosystems. We analyze how land use (protect...

Wetland ecosystems host an extensive number of avian species and play therefore a key role in biodiversity conservation. However, avifauna in wetlands is severely impacted by the anthropogenic transformation of natural habitats into other land uses. Understanding how habitat changes influence avian community dynamics is crucial for effective manage...

Animal tolerance towards humans can be a key factor facilitating wildlife–human coexistence, yet traits predicting its direction and magnitude across tropical animals are poorly known. Using 10,249 observations for 842 bird species inhabiting open tropical ecosystems in Africa, South America, and Australia, we find that avian tolerance towards huma...

In many low-income countries, the conservation of natural resources in protected areas relies on tourism revenue. However, tourist numbers in Africa were severely reduced by the COVID-19 pandemic, thus, putting the conservation of these important protected areas at risk. We use records from gate passings at national parks across Tanzania to demonst...

Anthropogenic disturbances are key factors affecting the distribution and ranging behaviour of wild elephants. Such disturbances exaggerate threats to the survival and population decline of wild elephants, and they have negative consequences for the livelihood of local people. We aimed to identify which factors influence the spatial movement, distr...

Understanding the drivers of animal population decline is a key focus of conservation biologists. Anthropogenic activities such as hunting have long been established as potentially detrimental to a population's persistence. However, environmental perturbations such as increased temperature variability, exacerbated by climate change, can also have i...

Although Kori Bustards (Ardeotis kori) are reported as diurnal, the species’ activity patterns have not been assessed to date. We report on the movement during different parts of the day of eight GPS-tagged individuals in the Serengeti ecosystem, Tanzania. Overall, mean distance moved was 206.2 m per hour. The shortest movements were recorded durin...

The study of attitudes toward wild elephants and human–elephant conflict (HEC) is vital to understanding what attitudes are held by local people and how to incorporate them into wild elephant conservation. This study investigated the interlinkages between the HEC experience and local people’s attitudes toward the conservation of wild elephants and...

Climate change, human population growth and land use change are among the most important threats to nature and ecosystem services. Local appreciation of ecosystem services and knowledge of how the foundation of these services is affected by local livelihoods are important for the sustainability of natural resources and thus may fundamentally affect...

High mortality poses a serious threat to sustainable conservation of the African elephant (Loxodonta africana). Using detected carcass data collected by the Kenya Wildlife Service (KWS) during 1992-2017, we analyze temporal and spatial variation in elephant mortality in Kenya. We investigate the major mortality causes and means used to kill elephan...

This study used semi-structured interviews in two cities, Dodoma and Arusha, in Tanzania, to assess the difference in people’s conservation awareness between the two cities. Our results revealed that urban people were generally positive towards most statements related to biodiversity conservation in protected areas, and in a few cases, variations b...

Understanding the underlying causes behind human–elephant conflict (HEC)-driven mortality of humans and elephants will help improve both parties’ wellbeing. The objective of this study was to examine the temporal and spatial mortality patterns of humans and elephants and the influence of local attitudes, conflict factors and habitat factors on elep...

Integrating agroecosystems as bird habitats are very important for long-term conservation planning because intensified agricultural land use has been a global threat to avifauna. To make agriculture compatible with conservation, farming communities play a vital role because the adoption of bird-friendly agricultural practices and involvement in bir...

Historically, mothers producing twins gave birth, on average, more often than non-twinners. This observation has been interpreted as twinners having higher intrinsic fertility – a tendency to conceive easily irrespective of age and other factors – which has shaped both hypotheses about why twinning persists and varies across populations, and the de...

We conducted a one-year study in TWS, Bangladesh, to test socioeconomic-related impacts on the sanctuary caused by three performers marked as forest-endorsed settlers, illegal settlers, and forest-nearest villagers. The performer’s activities were marked as cattle ranching, gardening, paddy cultivation, vegetable growing, betel-leaf growing, and fo...

Illegal hunting for bushmeat in or near protected areas is a significant threat to biodiversity conservation. This study assessed knowledge by local people of the occurrence of topi (Damaliscus lunatus) in the Serengeti Ecosystem and linked it with the level of illegal hunting for bushmeat consumption. A total of 150 households from three villages...

Accurate abundance estimates can contribute to effective management of large carnivore populations. Lion Panthera leo and spotted hyena Crocuta crocuta populations are frequently estimated at night by eliciting their approach using broadcasted vocalizations. Spotlights are typically used to observe these species on approach but can disturb animals...

Ectoparasite load in small mammals can be influenced by both environmental conditions and host species characteristics. However, the nature of these influences is poorly understood in many ecosystems. We used zero-inflated negative binomial (ZINB) regression models with a log link function to assess variation in ectoparasite load among 19 small mam...

Understanding the interest of local communities and ensuring their support in conservation are pivotal to the sustainability of Protected Areas (PAs). In this study, we interviewed 230 households surrounding the Indawgyi Wildlife Sanctuary (IWS) and assessed community attitudes and conservation involvement against socioeconomic background, benefits...

The ability to track variation in climate is important for species to persist in a given environment. Lack of responses to both long-term changes and inter-annual variation in climate parameters can result in reduced fitness and population decline. Furthermore, migration strategy can influence the ability to track climatic variation due to the pote...

We examined the relationship between the presence or absence of elephants in patches of land and the most common ecological factors, such as fodder species, water bodies, resting places, elephant movement trails, and soil types, across ten transect sites in the Teknaf Wildlife Sanctuary (TWS), Bangladesh. By ground-truthing 360 line transects and 1...

Most large carnivore populations are declining due to anthropogenic activities including direct persecution, prey depletion, habitat loss and degradation. protected areas (PAs) can help maintain viable large carnivore populations; however, anthropogenic activities occurring near and within PA borders or edges can reduce their effectiveness. We inve...

Most large carnivore populations are declining due to anthropogenic activities including direct persecution, prey depletion, habitat loss and degradation. protected areas (PAs) can help maintain viable large carnivore populations; however, anthropogenic activities occurring near and within PA borders or edges can reduce their effectiveness. We inve...

The Sundarban Reserve Forest (SRF) of Bangladesh provides tourism services to local and international visitors. Indeed, tourism is one of the major ecosystem services that this biodiversity-rich mangrove forest provides. Through a convenient sampling technique, 421 tourist respondents were interviewed to assess their willingness to pay for the tour...

The Sundarban Reserve Forest (SRF) of Bangladesh provides tourism services to local and international visitors. Indeed, tourism is one of the major ecosystem services that this biodiversity-rich mangrove forest provides. Through a convenient sampling technique, 421 tourist respondents were interviewed to assess their willingness to pay for the tour...

Globally, traffic associated with roads that pass through protected areas are the cause of many negative impacts on wildlife, such as wildlife roadkill, which has occurred within the Serengeti ecosystem. A 200 km stretch of gravel road networks that passes through the Serengeti ecosystem was surveyed in 2015 for five consecutive days during each st...

Avian brood parasitism is costly for the host, in many cases leading to the evolution of defenses like discrimination of parasitic eggs. The parasite, in turn, may evolve mimetic eggs as a counter-adaptation to host egg rejection. Some generalist parasites have evolved host-specific races (gentes) that may mimic the eggs of their main hosts, while...

Bushmeat is an important source of protein, as well as economic income for communities in sub-Saharan Africa and Latin America. This study was conducted in north-western Serengeti, Tanzania, from July to September of 2019. Two villages were sampled for distance calculation: Kowak and Robanda. The snowballing technique was the sampling design adopte...

Calves of black rhino trail behind their mothers predisposing them to risks of attack by stalking predators. A total of 272 respondents were randomly selected and interviewed from 8 villages located in the Ngorongoro Conservation Area. Most of the interviewed wildlife rangers 87.5% had seen hyena attacking rhino calves and only 22.8% of the intervi...

Ecosystems provide goods and services that are basic needs for human well-being. Social, cultural, traditional and economic values are considered as part of ecosystem services from biodiversity within a given ecosystem. Despite these important roles, the exact ways in which different ecosystem services, with their rich biodiversity resources includ...

Lack of support from local communities for conservation and illegal resource harvest within Protected Areas (PAs) are among the major challenges for sustainable wildlife conservation including elephants. High human population growth rate and density in Africa, escalates Human Elephant Conflicts (HEC) as elephants try to disperse outside PAs where h...

The understanding of how educational and spatial factors influence appreciation of conservation benefits to locals living adjacent to protected areas is a very important aspect in conservation initiatives. In this study we compared how educational and spatial factors affect the appreciation of conservation benefits to local communities adjoining th...

Many protected areas (PAs) have been created globally in response to the dramatic human-induced decline in biodiversity. However, not all PAs successfully preserve their biodiversity and continued monitoring is vital to assess the effectiveness of conservation efforts. Here, we repeated a study done in 2003 to assess whether investments in anti-poa...

Habitat selection is central to shaping the abundance and distribution of organisms in space and time. We analysed land use (National Park, pastoralism and agriculture) and habitat selection by small mammals in the Tanzanian Serengeti Ecosystem, and how selection varies with rainfall seasonality and characteristics of used microhabitats. We trapped...

The Sundarban provides various types of resources for an estimated four million people living in and around this mangrove forest in its Bangladesh parts. This study was carried out to quantify the value of forest income in these communities with the aim of understanding the contribution and importance of forest resources to the livelihoods of the p...

Animals can employ a range of physiological mechanisms in response to unpredictable changes within their environment, such as changes in food availability and human disturbances. For example, impala exhibit higher faecal glucocorticoid metabolite (FGM) levels-indicative of physiological stress-in response to low food quality and higher human distur...

Human-elephant conflicts (HEC) are detrimental for both humans and elephants. A better understanding of HEC enhances effective mitigation strategies and promotes the well-being of humans and wild elephants. This study assesses the pattern and distribution of HEC in three different HEC hotspots in Myanmar and identifies local factors that contribute...

Understanding habitat preferences and distribution of threatened species is a cornerstone of conservation, however many of the techniques available can be resource intensive. One cost-effective method is by collecting information on species presence and absence from people who regularly interact with the area of interest, also known as Local Ecolog...

Human-carnivore encounters are common where humans and wild carnivores share the same landscape. The frequency of such encounters gives insight regarding carnivore density and might correlate with human-carnivore conflict incidences. We interviewed livestock owners in the eastern Serengeti ecosystem and recorded reported carnivore presence and rela...

Human disturbance represents a considerable challenge for the conservation of living organisms and has profound negative impacts globally. There is substantial variation in how species respond to human disturbance. The main aim of the present study is to examine how human activities influence the risk of brood parasitism and nest predation for thre...

Overdependence on and exploitation of forest resources have significantly transformed the natural reserve forest of Sundarban, which shares the largest mangrove territory in the world, into a great degradation status. By observing these, a most pressing concern is how much degradation occurred in the past, and what will be the scenarios in the futu...

Local communities living adjacent to protected areas (PA) play a vital role in biodiversity conservation. Understanding communities' use and perceptions of a PA will increase its conservation effectiveness through reducing anthropogenic pressures and improving park-people relationship. This study assessed local communities' dependency on the PA and...

Understanding attitudes of local leaders towards conservation issues in village areas surrounding protected areas is vital for the success of sustainable biodiversity conservation. This is because of the need of designing effective conservation programs outside protected areas and to reduce resource-based conflicts involving local communities and p...

Globally mangrove forests are among the most severely threatened ecosystems. The protection value of mangrove forests is important for policy makers as a means of increasing forestation in coastal areas. Only a few economic studies have estimated the protective value of mangrove ecosystems. None have estimated the value of this service in the Sunda...

Carrion represents an unpredictable and widely distributed primary food source for vultures and other avian scavengers. Avian scavengers in African savanna ecosystems are reported to rely exclusively on visual stimuli to locate carcasses. However, carnivores’ predation of large mammalian herbivores and subsequent competition for access to the carca...

The increase in the human population and the demand for natural resources and recreational activities poses insurmountable threats to the welfare and survival of wildlife. Human disturbance negatively impacts wildlife populations. A prospective way of determining wildlife welfare is to assess stress. To manage and conserve giraffes, it is vital to...

This study investigated the factors affecting different group sizes of Maasai giraffe (Giraffa camelopardalis tippelskirchi) in the Serengeti-Ngorongoro ecosystem. The study was motivated to test the following hypotheses: 1) in a given group, the sex ratio of males to females with calves is related to group size; 2) group size affects vigilance beh...

Annual Conference hosted by The International Society of Tropical Foresters (ISTF) at the Yale School of Forestry & Environmental Studies, Yale University

In East Africa, climate change is predicted to reduce vegetation quality, and pervasive human disturbance has already resulted in significant declines in biodiversity. We studied the combined effects of reduced forage quality and human disturbance on faecal glucocorticoid metabolite (FGM) concentrations. We predicted that decreasing nutritional qua...

This study assesses the patterns of crop damage by elephants Loxodonta africana in areas adjacent to the Rungwa, Kizigo and Muhesi Game Reserves in Tanzania. We used a questionnaire survey to collect data from a total of 210 household heads from seven villages, with 30 household heads in each village, during June–August 2015. Proximity was a signif...

Understanding the factors affecting a species' population size is crucial for conservation initiatives. Hyraxes are small, gregarious animals, predominantly found on kopjes (rock outcrops) and thus form metapopulation communities. In Tanzania, two species of hyraxes inhabit Serengeti National Park, the rock hyrax Procavia capensis johnstoni and bus...

Many animal populations are exposed to disturbance originating from human activities. In response to human disturbance, certain animals display a variety of potentially costly behavioural responses, such as increased antipredator behaviour or relocation to new areas. In contrast, other animals seemingly thrive in the presence of humans and benefit...

Understanding how anthropogenic activities and management actions influence the delivery of ecosystem services is complicated by the interrelated nature of diverse factors. We present a Bayesian Belief Network to highlight the likely consequences of a set of interventions on four wildlife-related ecosystem (dis)services and for supporting biodivers...

This study aimed to understand the movement behaviour and utilization distributions of Kori bustards in space and time in the Serengeti ecosystem. A total of 14 individuals were tracked with the aid of GPS (Geographical positioning system) satellite transmitters, and their sexes were identified using DNA analysis. A species utilization distribution...

Land use is an important factor influencing animal abundance, species richness and diversity in both protected and human-dominated landscapes. Increase in human population and activities intensify changes in habitat structure and hence abundance, species richness and diversity. We investigated the influences of land use and seasonality on small mam...

Bushmeat hunting is widespread in villages adjacent to protected areas in Western Serengeti. However, little information is available about the role of bushmeat income in the household economy as a function of distance from the protected area boundary, preventing the formulation of informed policy for regulating this illegal trade. This study was c...

The need for rapid development in developing countries has led to establishment of major public infrastructure even in biodiversity rich protected areas. Mikumi National Park in central Tanzania is traversed by five such major infrastructures namely an optic fibre, a busy public road, an oil pipeline, power lines and railways. We assessed diversity...

Human-wildlife conflicts (HWC)are often caused by human population increase, high livestock and wildlife population densities and changing land use and climate. These conflicts are typically most intense in human-dominated systems where people, livestock and wildlife share the same landscapes and during severe droughts. Consequently, HWC are common...

In African savannas, and many other rangelands around the world, wildlife presently find themselves interacting with livestock. Many studies have been conducted on vigilance behaviour in response to presence of predators on foraging grounds, but few scientists have included the presence of livestock and how this affects vigilance when foraging toge...

Pressures on protected areas (PAs) in Tanzania are increasing through the extractive use by surrounding communities. Understanding how environmental reliance varies in relation to distance from PAs and in relation to household’s socio-economic characteristics is important for PAs management and decision of poverty alleviation strategies. This study...

Our knowledge of avian brood parasitism is primarily based on studies of a few selected species. Recently, researchers have targeted a wider range of host–parasite systems, which has allowed further evaluation of hypotheses derived from well-known study systems but also disclosed adaptations that were previously unknown. Here we present development...

House Crows Corvus splendens lay eggs with bluish-green ground colour and black or brown blotches and only one egg morph was believed to exist. Here, we confirm the existence of an immaculate, spotless blue egg morph that is clearly different from the regular egg morph.

Conservation crimes are posing serious threats to wildlife species and biodiversity of the Rungwa-Kizigo-Muhesi-Game-Reserves. Devising effective strategies to reduce risks to as low as reasonably possible of these crimes, calls for adequate information on factors driving people to commit these crimes. Data for this study were obtained from 315 res...

The disappearance of an endangered African wild dog population from Serengeti National Park (SNP) led to international debate centered around one question: were researchers to blame? The “Burrows' hypothesis” postulated that stress induced by research‐related immobilization and handling reactivated a latent rabies virus, eliminating the population....

Human activities can lead to various changes in wildlife populations’ behaviour and dynamics. Understanding specific responses to disturbances can help conservation management better protect wildlife populations to coexist with local communities. Here, we studied the response of a model ungulate species, the impala (Aepyceros melampus), to differen...

The conservation of threatened species requires information on how management activities influence habitat quality. The Critically Endangered black rhinoceros Diceros bicornis is restricted to savannahs representing c. 5% of its historical range. Fire is used extensively in savannahs but little is known about how rhinos respond to burning. Our aim...

Studies have demonstrated that wildlife conservation success depends on local people’s attitudes toward wildlife. We conducted semi-structured interviews with 240 respondents living in five villages outside the south-western Rungwa Game Reserve (RGR). Results revealed 89% of the respondents were aware of wildlife conservation, and their awareness v...

Trophy hunting may influence wildlife populations in many ways, but these effects have received little consideration in many of Africa's protected areas. We assessed the effects of trophy hunting on group size, behaviour, flight initiation distance, sex ratio and calf recruitment rate in two model species, impala (Aepyceros melampus) and greater ku...

Host quality is critical for parasites. The common cuckoo Cuculus canorus is a generalist avian brood parasite, but individual females show strong preference for a specific host species. Here, we use three extensive datasets to investigate different host characteristics determining cuckoo host selection at the species level: (i) 1871 population-spe...

The breeding ecology of the Kori Bustard Ardeotis kori strunthiunculus was studied in the plains of the Serengeti National Park, Tanzania in 2014 and 2015. Random transects were used to search for male courtship displays, nests, chicks and subadults. GPS satellite collars were used to locate nesting females. Linear regression analyses and post hoc...