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First published online June 7, 2004
Journal of Experimental Biology 207, 2529-2538 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01050

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Seasonality of energetic functioning and production of reactive oxygen species by lugworm (Arenicola marina) mitochondria exposed to acute temperature changes

Martina Keller¹, Angela Maria Sommer², Hans O. Pörtner¹ and Doris Abele^1,*

¹ Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse 27568 Bremerhaven, Germany
² International University Bremen, Campus Ring 1, 28759 Bremen, Germany

^* Author for correspondence (e-mail: dabele{at}awi-bremerhaven.de)

Accepted 22 April 2004

The influence of seasonal and acute temperature changes on mitochondrial functions were studied in isolated mitochondria of the eurythermal lugworm Arenicola marina (Polychaeta), with special emphasis on the interdependence of membrane potential and radical production. Acclimatisation of lugworms to pre-spawning/summer conditions is associated with rising mitochondrial substrate oxidation rates, higher proton leakage rates, elevated membrane potentials, and increased production of reactive oxygen species (ROS) in isolated mitochondria, compared with mitochondria from winter animals. However, a high ROS production was compensated for by higher activities of the antioxidant enzymes catalase and superoxide dismutase, as well as lower mitochondrial densities in summer compared with winter animals. In summer animals, a higher sensitivity of the proton leakage rate to changes of membrane potential will confer better flexibility for metabolic regulation (mild uncoupling) in response to temperature change. These seasonal alterations in mitochondrial functions suggest modifications of energy metabolism in eurythermal and euryoxic organisms on intertidal mudflats during summer. In winter, low and less changeable temperatures in intertidal sedimentary environments permit higher respiratory efficiency at low aerobic metabolic rates and lower membrane potentials in A. marina mitochondria.

Key words: lugworm, Arenicola marina, mitochondria, ROS, proton leak, metabolic regulation, temperature

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