Cannot help you with the subspecies of the cormorant, but the willows forming their backdrop are
Salix cinerea.
To non-Norwegians, this particular lake (Østensjøvann, literally "The lake [of the farm] of the eastern lake", thus there is a nice circularity in its namesetting) is a highly eutrophic (nutrient-rich) habitat in an otherwise bland landscape and harbours a high diversity of migratory birds. The location near the capital Oslo makes it very easily accessible. Its flora used to be highly diverse as well, before the avian abundance adversely impacted it. I'm not a birder yet have captured arctic snow geese and other rarities there. My excuse is of course the testing of long focal lenses
Alternatively, the need for getting shots of aquatic plants otherwise out of reach...
