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The diurnal cycle and locomotion in earthworms

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Summary

  1. 1.

    The time necessary for crawling 10 cm up an incline of 45° was found for earthworms, Lumbricus terrestris L., during test periods starting at 700, 1200 and 1900.

  2. 2.

    For 446 trials run in the morning, the average time was 17.19 seconds. For 475 tests done at midday, the average was 21.52 seconds, and for 475 trials run at 1900, it was 16.49 seconds. The differences between the averages for 700 and 1200 and for 1200 and 1900 are significant (p<0.001).

  3. 3.

    These results and differences in light-reaction times at 1200 and 1900 are compared.

Zusammenfassung

  1. 1.

    Die Zeit, die Regenwürmer (Lumbricus terrestris L.) benötigen, um auf einer schiefen (45°) Ebene 10 cm aufwärts zu kriechen, wird um 700, 1200 und 1900 Uhr gemessen.

  2. 2.

    Um 700 Uhr beträgt diese Zeit im Mittel 17,19 sec (446 Versuche), um 1200 Uhr 21,52 sec (475 Versuche) und um 1900 Uhr 16,49 sec (475 Versuche). Der Unterschied zwischen 700 und 1200 und der zwischen 1200 und 1900 ist statistisch gesichert (p<0,001).

  3. 3.

    Diese Ergebnisse werden mit der Lichtreaktionszeit von Lumbricus verglichen.

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Literature

  • Bennett, Miriam F., and Dana C. Reinschmidt: The diurnal cycle and a difference in reaction times in earthworms. Z. vergl. Physiol. 49, 407–411 (1965).

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Supported by a grant from the Committee on Faculty Research, Sweet Briar College.

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Bennett, M.F., Reinschmidt, D.C. The diurnal cycle and locomotion in earthworms. Z. Vergl. Physiol. 51, 224–226 (1965). https://doi.org/10.1007/BF00299296

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  • DOI: https://doi.org/10.1007/BF00299296

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