BIOTIC References
9204Johannesson, K., 1988. The paradox of Rockall: why is a brooding gastropod (Littorina saxatilis) more widespread than one having a planktonic larval dispersal stage (L. littorea)? Marine Biology, 99, 507-513.
Search Google Scholar (click an authors name to search for other papers): Johannesson, KClick here to view all BIOTIC references