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A comparative study of reproductive and nutritional periodicities in two populations of Asterias rubens (Echinodermata: Asteroidea) from the English Channel

Published online by Cambridge University Press:  11 May 2009

D. Nichols
Affiliation:
Department of Biological Sciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter, EX PS
M. F. Barker
Affiliation:
Department of Biological Sciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter, EX PS

Extract

Gonadial, pyloric caecal and somatic indices and oocyte size-frequencies are compared over a 3-year period for the starfish Asterias rubens from an intertidal nutritionally rich site and a subtidal impoverished site from the English Channel off south-west Britain. The intertidal population showed significantly higher values for all three indices over most of the study period compared with the subtidal population, and its spawning occurred later. The somatic index of the subtidal population showed a steeper rise than the intertidal population over that part of the cycle in which the gonads were undergoing enlargement, which gives further support to the suggestion that starfishes deprived of sufficient food may give priority to maintenance of the body-wall over enlargement of either the food-storage tissues of the pyloric caeca or the gonads.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1984

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References

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