Diress Tsegaye Alemu

Research Scientist

(+47) 930 53 761

Ås O43

Visiting address
Oluf Thesens vei 43, 1433 Ås




I hold a PhD degree in Management of Natural Resource Management  (2010) at the Norwegian University of Life Sciences (NMBU), Norway. I have over 20 years of international research and teaching experience in ecology and management of natural resources. previously, I worked a researcher at the University of Oslo and NMBU from July 2010- February 2023. My research focuses on patterns and processes in agricultural and natural landscapes, climate change, land use/cover  analysis,, biodiversity conservation, and wildlife management. Highly skilled with long-term experiences in organizing, and analyzing ecological data and presenting results to a high standard. Published more than 50 papers and technical reports, of which 42 are peer-reviewed scientific journal articles. I have strong modelling/statistical data analysis background with very good skills in R'/Rstudio programming, ArcGIS, and QGIS softwares. I also possess project leadership with interdisciplinary multicultural teams.


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Near-shore areas face multiple stressors, effects of climate change, coastal construction and contamination. Although capping the seabed in these areas with mineral masses can reduce the impact of legacy contaminants in sediment, it can also result in the loss of flora and sessile fauna, both of which are vital components of near-shore ecosystems. Eelgrass (Zostera marina) is essential to marine near-shore areas as it supports biodiversity and mitigates the effects of climate change. Therefore, it would be beneficial to modify the top layer of caps to facilitate the reestablishment of these ecosystems when capping near-shore areas. This study describes results from an in situ, six-month field experiment conducted to compare increase in leaf length over the growing season and survival of eelgrass transplanted in two commercially available substrates (Natural sand and Crushed stone) and indigenous sediment (i.e., indigenous control sediment) in a capping project in Horten Inner harbour, Norway. Similar leaf length increase was found in Natural sand and Indigenous control sediment, both significantly higher compared to Crushed stone substrate. Survival was highest in our case in the Indigenous control sediment (120 %), with no significant difference between Crushed stone (20 %) and Natural sand substrates (25 %). These findings emphasize the importance of selecting appropriate substrate for successful seagrass restoration.

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Interspecific interaction among sympatric ungulates is important in management and conservation. We investigated behavioral interference between sympatric wild or semidomestic reindeer (Rangifer tarandus tarandus) and sheep (Ovis aries) in two field studies and one enclosure experiment. For free-ranging wild and semidomestic reindeer, interference between the two species increased with decreasing distances, occurring only at less than 200 m and 30 m, for wild and semidomestic reindeer, respectively, and neither species consistently dominated the other. In a controlled, duplicated experiment we tested interference and confrontations at the feeding patch level among semidomestic reindeer and sheep within 40 × 50 m enclosures. When new reindeer or sheep were introduced into enclosures already occupied by reindeer, new reindeer resulted in significantly more interference and confrontations among individuals compared to new sheep; i.e., intraspecific interference was more prevalent than interspecific interference at equal densities. For all study areas, confrontations decreased with time after “first encounter,” indicating cohabituation. A sympatric use of pastures was not visually disruptive for recorded grazing behavior for either species.