, Volume 6, Issue 1, pp 38-42

Maryland records of the gastropod,Littorina littorea, with a discussion of factors controlling its southern distribution

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The common periwinkle,Littorina littorea, is reported from Ocean City, Maryland, and its southern spread is reviewed. A southward flowing longshore current has assisted its southward spread. The southern limit of this species is correlated with water mean isothern of 21°C in the warmest month on both sides of the Atlantic. This limit may be expected to fluctuate with yearly variations in coastal water temperatures.