Physiological ageing in a polar and a temperate swimming scallop


Philipp, E., Brey, T., Heilmayer, O., Abele, D. and Pörtner, H.O. (2006) Physiological ageing in a polar and a temperate swimming scallop. Marine Ecology Progress Series, 307, 187-198.

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Description/Abstract

We compared physiological ageing parameters in 2 scallops, the temperate
Aequipecten opercularis and the Antarctic Adamussium colbecki. These 2 species are phylogenetically
closely related and display a similar lifestyle but have distinctly different maximum lifespans
(MLSP). A. opercularis does not live longer than 8 to 10 yr, whereas A. colbecki lives over 18 yr. The
development of several physiological ageing parameters over time, chosen according to the ‘free radical
theory of ageing‘, was compared in the 2 species to identify differences in the ageing process. In
the shorter-lived A. opercularis, activities of the mitochondrial enzymes citrate synthase and
cytochrome c oxidase and of the antioxidant enzyme catalase showed a more pronounced decrease
with increasing age than in the longer-lived A. colbecki. In line with this finding, lipofuscin accumulation
increased more distinctly in A. opercularis than in A. colbecki, while tissue protein content
decreased in A. opercularis but increased in A. colbecki. Its better preservation of mitochondrial and
antioxidant enzyme activities and the avoidance of waste accumulation may enable A. colbecki to
live longer than A. opercularis. Mitochondrial function investigated in A. opercularis showed only
minor changes with age, and mitochondrial H2O2 generation rates were low at all ages. We relate our
findings to the ‘free radical–rate of living’ theory, to the ‘uncoupling to survive‘ hypothesis, and to the
particular lifestyle of these scallops.

Item Type: Article
ISSNs: 0171-8630 (print)
Related URLs:
Keywords: ageing, scallops, reactive oxygen species, ROS, Mitochondria
Subjects: Q Science > QL Zoology
Q Science > QP Physiology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 46970
Date Deposited: 20 Jul 2007
Last Modified: 27 Mar 2014 18:30
URI: http://eprints.soton.ac.uk/id/eprint/46970

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