The species can be divided into four genetically distinct populations , one widespread population , and three which have diverged due to small effective population sizes , possibly due to adaptation to the local environment . The first of these is the population of lobsters from northern Norway , which have been referred to as the " midnight @-@ sun lobster " . The populations in the Mediterranean Sea are distinct from those in the Atlantic Ocean . The last distinct population is found in the Netherlands : samples from the Oosterschelde were distinct from those collected in the North Sea or English Channel .