Environmental influence on the locomotor activity rhythm of Talitrus saltator (Crustacea: Amphipoda) |
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Authors: | J A Williams |
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Institution: | (1) Department of Marine Biology, University of Liverpool, Port Erin, Isle of Man, British Isles;(2) Present address: Ashurst Lodge, Imperial College at Silwood Park, SL5 7PY Ascot, Berks, England |
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Abstract: | The persistence and precision of the endogenous, nocturnal, circadian locomotor rhythm of the sand-beach amphipod Talitrus saltator is characterised, and the influence of substrate availability, photoperiod, temperature and relative humidity as potential environmental synchronizers of the rhythm is assessed. Individual, cyclic light-dark and temperature regimes synchronize and modify the laboratory activity pattern, but substrate availability and relative humidity have no significant long-term effect. Under simulateneous experimental regimes simulating field conditions of photoperiod, temperature and relative humidity the rhythm is entrained solely by photoperiod. The implications are discussed in relation to field behaviour. |
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