Endogenous rhythms of locomotor activity in the high-shore limpet, Helcion pectunculus
Article Abstract:
The high-shore, crevice-dwelling limpet Helcion pectunculus, is active during night time low tides and daytime low tides when in the shade. To examine whether such an activity is controlled by internal clock or by stimuli such as light levels and tidal phase, maximum entropy spectral analysis (MESA) was used. This showed that limpets have a free-running endogenous rhythm of locomotor activity, both circadian and circatidal. It is suggested that this rhythm has a role in enabling individuals to avoid unfavourable environmental conditions.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1999
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The locomotor activity rhythm of the edible snail, Helix lucorum L., in symmetrical skeleton photoperiod regimes
Article Abstract:
Activity rhythm of the edible H. lucorum snails is compatible with different skeleton photoperiods and the phase of the peak of the snails activity is correlated to the time interval between the two high pulses in skeleton photoperiods as revealed by the analysis of skeleton photoperiod regimes adaptations in adult Helix lucorum, edible snails. Minimum night length was the only precondition necessary for the maintenance of the daily night rhythm of the snails.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1995
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Photoperiod and tutor access affect the process of vocal learning
Article Abstract:
Photoperiod and tutor exposure were manipulated in male nestling sparrows to determine the influence of external factors on memorization, song practice and crystallization. Results indicate that memorization is not affected by photoperiod but practice and crystallization are influenced by both photoperiod and tutor exposure. Further, testosterone concentration may also affect song learning among male sparrows.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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