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Further studies on the effects of stress in the adult on the eggs of Mytilus edulis

Published online by Cambridge University Press:  11 May 2009

B. L Bayne ,
D. L. Holland ,
M. N. Moore ,
D. M. Lowe  and
J. Widdows
B. L Bayne
Affiliation:
Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth
D. L. Holland
Affiliation:
† N.E.R.C. Unit for Marine Invertebrate Biology, Marine Science Laboratories, Menai Bridge, Gwynedd
M. N. Moore
Affiliation:
Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth
D. M. Lowe
Affiliation:
Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth
J. Widdows
Affiliation:
Institute for Marine Environmental Research, Prospect Place, The Hoe, Plymouth
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Extract

Mussels (Mytilus edulis L.) were held under five different experimental conditions for 8 weeks during which measurements of physiological condition, and certain cytological and cytochemical observations, were made. The mussels were then induced to spawn and the numbers of eggs released, the weights of these eggs, and their biochemical composition, were determined. During the experiment new gametes were developed by mussels under all conditions, but there was also a simultaneous regression and resorption of previously formed gametes, particularly in mussels under the greatest stress from high temperature and lack of food. The degree of stress experienced by the animals was measured as the scope for growth, or the energy available for somatic growth and the production of gametes. The distribution and activity of lysosomal enzymes within the Leydig tissue of the mantle suggested that autolysis of these cells occurred, coupled to the mobilization of glycogen for gametogenesis. Mussels under stress produced fewer and smaller eggs, in smaller follicles, than mussels not under stress. The biochemical composition of the eggs (as µg of biochemical component per mg of egg) did not vary consistently with adult condition, but eggs from stressed females had less lipid and protein than eggs from normal females. It is suggested that these relationships between the physiological condition of the adult, gametogenesis, fecundity and the biochemical content of the eggs are important for understanding the impact of the environment on ecological fitness.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 58 , Issue 4 , November 1978 , pp. 825 - 841
Copyright
Copyright © Marine Biological Association of the United Kingdom 1978

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References

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