The nature of heat coma in Littorina littorea (Mollusca: Gastropoda) |
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Authors: | A P Clarke P J Mill J Grahame |
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Institution: | (1) School of Biology, University of Leeds, Leeds LS2 9JT, Yorkshire, England Fax: 0044 (0)113 216 2401 e-mail: aclarke@mail.parklanecoll.ac.uk, GB |
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Abstract: | The nature of heat coma was examined in the edible periwinkle Littorina littorea (L.). Duration of acclimation did not influence heat-coma temperature at 12 °C, although other acclimation temperatures were
important in influencing thermal tolerance, with positive shifts in coma temperature observed in response to elevated temperatures.
Previous thermal history also influenced heat-coma temperatures. Individuals subjected to repeat heat-coma events on a daily
basis showed significant declines (P < 0.05) in coma-temperature; in contrast individuals exposed to repeat heat-coma events on a weekly basis showed no decline
in thermal tolerance. Size-effects occurred at selected sites, where decreased heat-coma temperatures were recorded in large
individuals.
Received: 16 August 1999 / Accepted: 13 June 2000 |
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