Abstract
The acute upper lethal temperature (AULT) at different rates of increase was evaluated as a tool for the design of cheaper and environmentally friendlier control strategies for the invasive bivalve Limnoperna fortunei. Survivorship of 6 ± 2 mm and 20 ± 2 mm mussels acclimated to 12, 23 and 28°C and subjected to different heating rates (1°C per 5, 15 and 30 min) was estimated in the laboratory. The temperatures required to kill 50% (LT50) and 100% (SM100) of the mussels, and the mean death temperature (MDT) varied between 42.2 and 51°C over 54 experiments. Heating rates significantly (p < 0.001) affected LT50, SM100, and MDT. AULT was not affected by mussel size and acclimation temperatures. Limnoperna appears to be more resistant to high temperatures than Dreissena polymorpha, a mussel invasive in the USA and Europe. Lethal temperatures of L. fortunei are within the current thermal operational industrial capacities, suggesting that heat treatment is a viable alternative for controlling its fouling in utility systems.
Acknowledgements
This article was financially aided by grants PICT 2004–25275 and PICT 2007–1968 (from the Agencia Nacional de Promoción Científica y Tecnológica), and UBA EX-020 (from the University of Buenos Aires). Critical comments by four anonymous reviewers greatly helped to improve the original version of this publication.