Abstract
THE immigrant barnacle Elminius modestus, spreading from the Channel, has been known for several years in the North Sea, being reported from the Thames before 1948 (refs. 1 and 2), from the Humber in 1951 (ref. 2) and from near the Tees in 1958 (ref. 3). There its northwards progress along the east coast was arrested; however, a separate settlement, doubtless introduced by shipboard agency, nourishes in the Forth4, extending as far south as Dunbar. The intervening coast has remained uncolonized until recently, despite a considerable seaborne traffic between the Thames and the principal rivers of Northumberland and Durham. Apart from those found on ships' bottoms, a specimen settled on a mussel in the River Blyth in 1950 and two specimens settled on a mussel in the River Tyne in 1961 constitute the only records from these counties until this year.
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References
Knight-Jones, E. W., Nature, 161, 201 (1948).
Crisp, D. J., J. Mar. Biol. Assoc. UK, 37, 483 (1958).
Crisp, D. J., Nature, 188, 681 (1960).
Jones, D. H., Nature, 190, 103 (1961).
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EVANS, F. Isolated Population of Elminius modestus (Crustacea: Cirripedia) in Northumberland. Nature 220, 260 (1968). https://doi.org/10.1038/220260a0
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DOI: https://doi.org/10.1038/220260a0
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