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Speciation among Lampreys


NOT all lampreys migrate to the sea. Some (the ‘landlocked’) always remain in fresh water; but after metamorphosis they migrate from the brooks, where they are born, to lakes and rivers. After a long feeding period they go back to the brooks, where they spawn and then die. This is known to happen with Petromyzon marinus, the landlocked form of which multiplied abundantly and spread widely in the Great Lakes of North America1. The same phenomenon was recorded for Lampetra fluviatilis of Lakes Ladoga and Onega in the U.S.S.R.2

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  1. 1

    Applegate, V. C., and Moffett, J. W., Sci. Amer., 192, 4, 36 (1955).

  2. 2

    Berg, L. S., Ann. Mus. Zool. Acad. Sci. U.R.S.S., I, 87 (1931).

  3. 3

    Zanandrea, G., Pubbl. Staz. Zool. Napoli, 31, 127 (1959).

  4. 4

    Young, J. Z., “The Life of Vertebrates” (Oxf. Univ. Press, 1950)

  5. 5

    Leach, W. J., J. Morph., 89, 2, 217 (1951)

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    Zanandrea, G., Boll. di Zool., 23, 414 (1956); Atti Instit. Ven. L. Sci., A., 116, 180 (1958); Nature, 179, 928 (1957).

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