Browsing NTNU Open by Author "Røskaft, Eivin"
Now showing items 1-20 of 111
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A genetic insight to the population of African savannah elephants (Loxodonta africana) in the Serengeti Ecosystem, Tanzania.
Rosenlund, Håvard (Master thesis, 2011)African savannah elephants play a vital role in the Serengeti ecosystem with the opportunity to alter the entire ecosystem by its sheer number. Management of these animals are therefore of high importance, but little genetic ... -
Ancient origin and maternal inheritance of blue cuckoo eggs
Røskaft, Eivin; Møller, Anders P.; Liang, Wei; Sorenson, Michael D; Yang, Canchao; Takasu, Fugo; Stokke, Bård Gunnar; Fossøy, Frode; Moksnes, Arne; Ekrem, Torbjørn; Rutila, Jarkko (Journal article; Peer reviewed, 2016)Maternal inheritance via the female-specific W chromosome was long ago proposed as a potential solution to the evolutionary enigma of co-existing host-specific races (or ‘gentes’) in avian brood parasites. Here we report ... -
Anthropogenic Impacts on the Social Structure and Behaviour of Impala (Aepyceros melampus) Populations in Areas of Different Land Use - A case study from the Serengeti Ecosystem, Tanzania
Setsaas, Tuva (Master thesis, 2017)The impact of anthropogenic disturbance on wildlife populations in protected areas as vital for management regulations and conservation efforts. Knowledge of how different human activities might impact social structure and ... -
Are cuckoos maximizing egg mimicry by selecting host individuals with better matching egg phenotypes?
Antonov, Anton Tinchov; Stokke, Bård Gunnar; Fossøy, Frode; Ranke, Peter Sjolte; Liang, Wei; Yang, Canchao; Moksnes, Arne; Shykoff, Jacqui A.; Røskaft, Eivin (Journal article; Peer reviewed, 2012)Background: Avian brood parasites and their hosts are involved in complex offence-defense coevolutionary arms races. The most common pair of reciprocal adaptations in these systems is egg discrimination by hosts and egg ... -
Assessing crop and livestock losses along the Rungwa-Katavi Wildlife Corridor, South-Western Tanzania
Hariohay, Kwaslema Malle; Fyumagwa, Robert D.; Kideghesho, Jafari Ramadhani; Røskaft, Eivin (Journal article, 2017)Humans and wildlife interact negatively, especially when humans transform natural wildlife habitats by establishing settlements and crop fields. Encroachment and habitat fragmentations caused by human activities decrease ... -
Assessing the effect of roads on impala (Aepyceros melampus) stress levels using faecal glucocorticoid metabolites
Lunde, Even Tvede (Master thesis, 2013)Loss of habitat is the main cause of species extinction, which today is 100 - 1000 times faster than the background extinction rate before the presence of mankind. One cause is that natural areas are being increasingly ... -
Assessment of communities knowledge and perceptions on impacts of Hoima- Tanga crude oil pipeline to biodiversity in Swagaswaga Game Reserve
Nyakeko, Nyamasija (Master thesis, 2018)The Hoima - Tanga crude oil pipeline also known as the East African Crude Oil is under construction and intended to transport crude oil from Uganda s oil fields to the Port of Tanga in Tanzania on the Indian Ocean following ... -
Attitudes of Local Communities towards the Conservation of a Wetland Protected Area: a Case Study from the Moeyungyi Wetland Wildlife Sanctuary in Myanmar
hantun, zinphyo (Master thesis, 2018)Attitudinal studies are globally being recognized as useful indicators for evaluating the efficiency of conservation policy. An understanding of the attitudes of local communities towards nearby protected areas (PAs) helps ... -
Avian brood parasitism — a growing research area in behavioral ecology (part II)
Røskaft, Eivin; Liang, Wei; Stokke, Bård Gunnar (Journal article, 2013) -
Behavioural and demographic changes in impala (Aepyceros melampus) populations after a decade of changed conservation management – a case study in the Serengeti Ecosystem, Tanzania
Flølo, Linn Marie (Master thesis, 2019)I det vestlige Serengeti-økosystemet er det gjort betydelige investeringer i bevaring og forvaltning av Grumeti-området siden begynnelsen av det 21. århundre. Ved å bruke impala (Aepyceros melampus) som studieart, undersøkte ... -
Behavioural Ecology of Free-ranging and Reintroduced African Wild Dog (Lycaon pictus) Packs in the Serengeti Ecosystem, Tanzania
Masenga, Emmanuel Hosiana (Doctoral theses at NTNU;2017:154, Doctoral thesis, 2017)Worldwide, large carnivore conservation has become an increasing challenge in the face of human population growth and anthropogenic development adjacent to protected areas. African wild dogs (Lycaon pictus) range widely ... -
Being stressed outside the park — conservation of African elephants (Loxodonta africana) in Namibia
Hunninck, Louis; Ringstad, Iris; Jackson, Craig Ryan; May, Roelof Frans; Fossøy, Frode; Uiseb, Kenneth; Killian, Werner; Røskaft, Eivin (Journal article; Peer reviewed, 2017)The conservation of the African savanna elephant (Loxodonta africana) is of prime importance for many African countries. Interactions between elephants and humans are known to induce stress and thereby have the potential ... -
Breeding ecology of Kori Bustard Ardeotis kori strunthiunculus in the Serengeti National Park
Mmassy, Emmanuel Clamsen; Fyumagwa, Robert D.; Bevanger, Kjetil Modolv; Røskaft, Eivin (Journal article; Peer reviewed, 2018)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, ... -
Breeding success of the Gyrfalcon (Falco rusticolus) in northern Norway in relation to food supply and weather
Jamrozik, Kamila (Master thesis, 2012)Food supply and weather are among the main factors limiting bird numbers. In raptors prey availability may be closely linked to the reproduction output while weather conditions most often act indirectly by modifying food ... -
Characteristics determining host suitability for a generalist parasite
Stokke, Bård Gunnar; Ratikainen, Irja Ida; Moksnes, Arne; Røskaft, Eivin; Schulze-Hagen, Karl; Leech, David I.; Møller, Anders pape; Fossøy, Frode (Journal article; Peer reviewed, 2018)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 ... -
Climate Change and Human Population Increase Impacts on Swayne's Hartebeest (Alcelaphus buselaphus swaynei) Conservation in Senkele Swayne's Hartebeest Sanctuary, Ethiopia
Lemessa, Aman Desta (Master thesis, 2015)Swayne s hartebeest (Alcelaphus buselaphus swaynei) is an endangered endemic antelope found in Ethiopia. The only viable population found in Senkele has been threatened by anthropogenic activities. Contemporary climate ... -
Coevolution in Action: Disruptive Selection on Egg Colour in an Avian Brood Parasite and its Host
Yang, Chanchao; Liang, Wei; Cai, Yan; Shi, Suhua; Takasu, Fugo; Møller, Anders pape; Antonov, Anton Tinchov; Fossøy, Frode; Moksnes, Arne; Røskaft, Eivin; Stokke, Bård Gunnar (Journal article; Peer reviewed, 2010)Background: Trait polymorphism can evolve as a consequence of frequency-dependent selection. Coevolutionary interactions between hosts and parasites may lead to selection on both to evolve extreme phenotypes deviating ... -
Collision risk in white-tailed eagles. Modelling collision risk using vantage point observations in Smøla wind-power plant
May, Roelof Frans; Lund, Pernille Andersen; Langston, Rowena; Dahl, Espen Lie; Bevanger, Kjetil Modolv; Reitan, Ole; Nygård, Torgeir; Pedersen, Hans-Christian; Stokke, Bård Gunnar; Røskaft, Eivin (NINA rapport, Research report, 2010)Large soaring birds of prey, such as the white-tailed eagle, are recognized to be perhaps the most vulnerable bird group regarding risk of collisions with turbines in wind-power plants. Their mortalities have called for ... -
Community Outreach Programmes and the Conservation of Protected Areas - A Case study of villages near Tarangire National Park, Tanzania
Sosiya, Timotheo (Master thesis, 2016)Linking conservation of wildlife in and around protected areas (PAs) to community livelihoods surrounding those areas is inevitable for sustainable co-existence between PAs and people. Community Outreach Programs (OP) are ... -
Confirmation of House Crows Corvus splendens laying immaculate blue eggs
Nahid, Mominul Islam; Fossøy, Frode; Stokke, Bård Gunnar; Begum, Sajeda; Røskaft, Eivin (Peer reviewed; Journal article, 2019)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 ...