J. O. Gjershaug

Publications61
h-index9
Citations217
Highly Influential Citations14
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Integrative taxonomy of an arctic bumblebee species complex highlights a new cryptic species (Apidae: Bombus)
6 While bumblebees have been the focus of much research, the taxonomy of many species groups 7 is still unclear, especially within circum-polar species. Delimiting species based on multisource 8… Expand
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Local resources, linear elements and mass-flowering crops determine bumblebee occurrences in moderately intensified farmlands
Abstract There is consensus that land-use change is a main driver behind the recent declines of many pollinator populations in Europe. However, it is still not adequately understood how the local… Expand
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Home-range size of the Javan Hawk-Eagle (Spizaetus bartelsi) estimated from direct observations and radiotelemetry
Morphological, vocal and molecular data have been used to reevaluate the taxonomy of some Asian Nisaetus taxa. This name is used instead of Spizaetus because the latter genus is polyphyletic with… Expand
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Habitat Use and Diet Composition of Norwegian Lemmings and Field Voles in Central Norway
Abstract This study examined habitat use and diet composition of Norwegian lemmings (Lemmus lemmus) and field voles (Microtus agrestis), which occur together and potentially compete for resources in… Expand
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Phylogeny and new taxonomy of the Booted Eagles (Accipitriformes: Aquilinae).
We present a phylogeny of all booted eagles (38 extant and one extinct species) based on analysis of published sequences from seven loci. We find molecular support for five major clades within the… Expand
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The social parasite bumblebee Bombus hyperboreus Schönherr, 1809 usurp nest of Bombus balteatus Dahlbom, 1832 (Hymenoptera, Apidae) in Norway.
Social parasitism is well known in bumblebees. Late emerging queens sometimes take over (usurps) an established nest of others of their own species or related species. The usurper attacks and kill… Expand
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Isolation, characterization and predicted genome locations of Eurasian eagle-owl (Bubo bubo) microsatellite loci
We isolated 134 eagle-owl (Bubo bubo) microsatellite sequences. Eight of these newly isolated loci were characterized in 38 Eurasian eagle-owls in a northern European population. Sequence homology… Expand
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Hybridisation between Common Buzzard Buteo buteo and Rough-legged Buzzard B-lagopus in Norway
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Utvikling av metodikk for arealrepresentativ overvåking av utvalgte invertebratgrupper. Pilotprosjekt Naturindeks for Norge
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Following the cold: geographical differentiation between interglacial refugia and speciation in the arcto‐alpine species complex Bombus monticola (Hymenoptera: Apidae)
Cold‐adapted species are expected to have reached their largest distribution range during a part of the Ice Ages whereas postglacial warming has led to their range contracting toward high‐latitude… Expand
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