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Age determination, growth rate and population structure of the horse mussel Modiolus modiolus

Published online by Cambridge University Press:  11 May 2009

N.A. Anwar ,
C.A. Richardson  and
R. Seed
N.A. Anwar
Affiliation:
University of Wales Bangor, School of Ocean Sciences, Menai Bridge, Gwynedd, LL59 5EY
C.A. Richardson
Affiliation:
University of Wales Bangor, School of Ocean Sciences, Menai Bridge, Gwynedd, LL59 5EY
R. Seed
Affiliation:
University of Wales Bangor, School of Ocean Sciences, Menai Bridge, Gwynedd, LL59 5EY
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Abstract

The age and growth rate of Modiolus modiolus have been studied from acetate peel replicas of polished and etched shell sections. Age estimates could be reliably obtained from the alternating patterns of light (summer) and dark (winter) growth lines present in the middle nacreous layer of the shell. Growth lines in the inner nacreous layer, however, generally converged to form blocks of nacre such that the identity of individual lines was lost, whilst in the umbones growth lines were often tightly compressed and difficult to resolve. Data obtained from analyses of the internal growth lines in the middle nacreous layer were used to construct growth curves for several subtidal populations using the von Bertalanffy growth equation. The fastest growth rate was recorded for mussels growing epifaunally on the legs of a drilling platform in the North Sea; these mussels achieved a maximum shell length of 110 mm within ten years. The oldest mussel (from Ling Bank in the northern North Sea) was 48 years old and measured 133 mm in length whilst the largest mussel (from Loch Spelve in western Scotland) was 147 mm long and 38 years old. With the exception of the relatively young population (maximum age 10 years) from the drilling platform, most of the benthic populations studied included mussels in excess of 35 years of age. It is clear, therefore, that M. modiolus is a potentially long-lived member of the subtidal benthos.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 70 , Issue 2 , May 1990 , pp. 441 - 457
Copyright
Copyright © Marine Biological Association of the United Kingdom 1990

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