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The influence of thermal parameters on the acclimation responses of pinfish Lagodon rhomboides exposed to static and decreasing low temperatures

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Pinfish Lagodon rhomboides acclimation rates were determined by modelling changes in critical thermal minimum (Tcrit min, ° C) estimates at set intervals following a temperature decrease of 3–4° C. The results showed that pinfish gained a total of 3·7° C of cold tolerance over a range of acclimation temperatures (Tacc, ° C) from (23–12° C), that cold tolerance increased with exposure time to the reduced temperature at all Tacc, but that the rate of cold tolerance accruement (mean 0·14° C day−1) was independent of Tacc. A highly significant (P < 0·001) multivariate predictive model was generated that described the acclimation rates and thermal tolerance of pinfish exposed to reduction in water temperature: log10Tcrit min= 0·41597 − 0·01704Tacc+ 0·04320Tplunge− 0·08376[log10 (t+ 1)], where Tplunge is plunge temperature (° C) and t is the time (days). A comparison of the present data, with acclimation rate data for other species, suggests that factors such as latitude or geographic range may play a more important role than ambient temperature in determining cold acclimation rates in fishes.

Keywords: Lagodon rhomboides; cold temperatures; pinfish; thermal acclimation

Document Type: Regular Paper


Affiliations: The University of West Florida, 11000 University Parkway, Pensacola, FL 32516, U.S.A.

Publication date: September 1, 2007


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