Diress Tsegaye Alemu

Forsker

(+47) 930 53 761
diress.alemu@nibio.no

Sted
Ås - Bygg O43

Besøksadresse
Oluf Thesens vei 43, 1433 Ås (Varelevering: Elizabeth Stephansens vei 23)

Vedlegg

CV

Biografi

Jeg har en doktorgrad i naturressursforvaltning (2010) ved Norges miljø- og biovitenskapelige universitet (NMBU), Norge. Jeg har over 20 års internasjonal forsknings- og undervisningserfaring innen økologi og forvaltning av naturressurser. Tidligere har jeg jobbet som forsker ved Universitetet i Oslo og NMBU fra juli 2010- februar 2023. Forskningen min fokuserer på mønstre og prosesser i landbruks- og naturlandskap, klimaendringer, analyse arealbruk/arealdekke, bevaring av biologisk mangfold og viltforvaltning. Svært god og lang erfaring i å organisere og analysere økologiske data og presentere resultater på høyt nivå. Jeg har publisert mer enn 50 artikler og tekniske rapporter, hvorav 42 er fagfellevurderte vitenskapelige tidsskriftartikler. Jeg har veldig gode ferdigheter i modellering/statistisk dataanalysebakgrunn med meget gode ferdigheter innen R/Rstudio programmering, ArcGIS og QGIS programvarer. Jeg har også prosjektledelse med tverrfaglige flerkulturelle prosjektgrupper.

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Sammendrag

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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Sammendrag

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.