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JPR Advance Access published online on September 6, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi060
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received April 27, 2005
Accepted August 30, 2005

Article

Physiological acclimation to decreased water temperature and the relative importance of water viscosity in determining the feeding performance of larvae of a serpulid polychaete

Toby F. Bolton 1 and Jon. N. Havenhand 2*

1 Lincoln Marine Science Center Flinders University--Adelaide PO Box 2023 Port Lincoln, SA, 5606, AUSTRALIA
2 Tjärnö Marine Biological Laboratory Department of Marine Ecology Gothenburg University 452 96 STRÖMSTAD, SWEDEN

* To whom correspondence should be addressed.
Jon. N. Havenhand, E-mail: Jon.Havenhand{at}tmbl.gu.se


  Abstract

Ambient temperature exerts both physiological and mechanical effects on the rates of functional processes of small aquatic ectotherms. Physiological effects of temperature result from its influence on the rates of chemical reactions. Mechanical effects of temperature result from the inverse relationship between the temperature of water and its dynamic viscosity. We measured the relative importance of these components of temperature on the feeding performance of polychaete larvae. Cohorts of larvae were reared for 24 hours at 20°C and 10°C in treatments where the physiological and mechanical effects of these temperatures were separated. The feeding performance of these larvae was subsequently measured in treatments where these components of temperature were similarly partitioned. Cold-reared larvae displayed complete acclimation of feeding performance to the physiological effects of decreased temperature: thus, increased viscosity was responsible for 100% of the difference in feeding performance between 20° C and 10° C. The physiological ability of small aquatic ectotherms to acclimate functional processes to temperature variation may be greater than previously thought and these results have implications for understanding the responses of aquatic ectotherms’ to global temperature change.

Communicating Editor: KJ Flynn
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