The two adults in this photo show distinct crests. Northern birds such as this (nominate race) average larger but there is much overlap and little genetic divergence between the subspecies. This species is sometimes considered monotypic. The gulls in front are Black-legged Kittiwakes (Rissa tridactyla). Canon PowerShot SX50 HS.
References:
Hobson, Keith A.(2013).Pelagic Cormorant (Phalacrocorax pelagicus), The Birds of North America (P. G. Rodewald, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/pelcor
Orta, J., Garcia, E.F.J., Jutglar, F., Kirwan, G.M. & Boesman, P. (2017). Pelagic Cormorant (Phalacrocorax pelagicus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/52637 on 28 July 2017).