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Observations on the growth and trematode infections of Peringia ulvae (Pennant) 1777 in a pool in the Tamar saltings, Plymouth

Published online by Cambridge University Press:  06 April 2009

Miriam Rothschild
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Extract

Samples of Peringia ulvae were collected and measured on eight occasions, over a period of two years from an isolated pool in the saltings of the River Tamar. Growth conditions in this pool are at a maximum. Spawning occurs in the autumn and the greatest number of small specimens are found in the sieve (1 mm. mesh) in February. Maximum growth takes place during April-July. After ten months of age,.uninfected snails which have reached a length of 5¾ mm. grow only 1–1¼ mm., and gradually die off from 17 months of age onwards. Infected snails display gigantism and variation and attain dimensions of 9–10 mm. They are probably no older than uninfected specimens measuring 6¾ mm. long.

The infection rate is high and shows certain seasonal fluctuations, no doubt linked with the migrations of the wading birds which are the principal final hosts of the trematodes.

Type
Research Article
Information
Parasitology , Volume 33 , Issue 4 , December 1941 , pp. 406 - 415
Copyright
Copyright © Cambridge University Press 1941

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References

REFERENCES

Hartley, P. H. T. & Spooner, G. M. (1938). The ecology of the Tamar Estuary. I. Introduction. J. Mar. Biol. Ass. 22, 501–8, 1 pl.CrossRefGoogle Scholar
Rothschild, M. (1938). Further observations on the effect of trematode parasites on Peringia ulvae (Pennant) 1777. Novit. Zool., Tring, 41, 84–102, 2 pls., 7 figs.Google Scholar
Rothschild, M. (1941). The effect of trematode parasites on the growth of Littorina neritoides (L.). J. Mar. Biol. Ass. 25, 69–80, 3 figs.CrossRefGoogle Scholar
Rothschild, A. & Rothschild, M. (1939). Some observations on the growth of Peringia ulvae (Pennant) 1777 in the laboratory. Novit. Zool., Tring, 41, pp. 240–7, 3 figs.Google Scholar