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Observations on relationships between infective juveniles of bovine lungworm, Dictyocaulus viviparus (Nematoda: Strongylida) and the fungi, Pilobolus kleinii and P. crystallinus (Zygomycotina: Zygomycetes)

Published online by Cambridge University Press:  06 April 2009

C. C. Doncaster
C. C. Doncaster
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Summary

Infective 3rd-stage larvae of Dictyocaulus viviparus were filmed whilst climbing sporangiophores of the coprophilous fungus, Pilobolus and invading sporangia in numbers up to about 50, shortly before the sporangia were explosively discharged. Like the sporangiophores of Pilobolus the nematodes reacted positively towards light. Robinson (1962) demonstrated the spectacular way in which D. viviparus can be dispersed by Pilobolus, although he saw the nematodes accumulating only on top of the sporangia. Hazards including desiccation would offset the advantage of dispersal unless protection is somehow provided. Free D. viviparus larvae are susceptible to desiccation and discharged sporangia appear to dry quickly, so what protection, if any, operates? Several other nematodes that are susceptible to desiccation survive because structures surrounding them dry quickly (for example, an ensheathing cuticle, egg-shell, gelatinous ‘egg-sac’ matrix) and in doing so form barriers which limit the rate of water loss from the nematode within. Such dried sporangia of Pilobolus could aid survival of the ensheathed D. viviparus larvae inside them by retarding desiccation of the nematodes, in much the same way that within cysts of Globodera and Heterodera spp. the cyst wall, egg matrix and outer eggs protect the inner eggs by reducing the rate, if not the extent, of water loss. The sporangium wall may also protect the nematodes from harmful ultraviolet irradiation and from being washed by rain into less advantageous situations.

Type
Research Article
Information
Parasitology , Volume 82 , Issue 3 , June 1981 , pp. 421 - 428
Copyright
Copyright © Cambridge University Press 1981

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References

REFERENCES

Bird, A. F. & Soeffky, A. (1972). Changes in the ultrastructure of the gelatinous matrix of Meloidogyne javanica during dehydration. Journal of Nematology 4, 166–9.Google ScholarPubMed
Buller, A. H. R. (1934). Researches on Fungi, vol. 6. London, New York, Toronto: Long- mans, Green & Co.Google Scholar
Ellenby, C. (1969). Dormancy and survival in nematodes. Symposium of the Society for Experimental Biology 23, 83–97.Google Scholar
Evans, A. A. F. & Perry, R. N. (1976). In The Organization of Nematodes (ed. Croll, N. A.), pp. 383–424. London, New York, San Francisco: Academic Press.Google Scholar
Fielding, M. J. (1951). Observations on the length of dormancy in certain plant infecting nematodes. Proceedings of the Helminthological Society of Washington 18, 110–12.Google Scholar
Forrester, D. J., Forrester, G. M. & Senger, C. M(1966). A contribution towards a bibliography on the lung nematodes of mammals. Journal of Helminthology 40, Suppl. 1–122.Google Scholar
Grove, W. B. (1934). Researches on Fungi, vol. 6, chapter 4. London, New York, Toronto: Longmans, Green & Co.Google Scholar
Perry, R. N. (1977). The water dynamics of stages of Ditylenchus dipsaci and D. myceliophagus during desiccation and rehydration. Parasitology 75, 45–70.Google Scholar
Poynter, D. (1963). Parasitic bronchitis. Advances in Parasitology 1, 179–212.Google Scholar
Robinson, J. (1962). Pilobolus spp. and the translation of the infective larvae of Dictyocaulus viviparus from faeces to pasture. Nature, London 193, 353–4.Google Scholar
Robinson, J., Poynter, D. & Terry, R. J. (1962). The role of the fungus Pilobolus in the spread of the infective larvae of Dictyocaulus viviparus. Parasitology 52, 17p–18p.Google Scholar
Soliman, K. N. (1952). Observations on the survival on pasture of preparasitic stages of Dictyocaulus viviparus in southern England. II. British Veterinary Journal 108, 204–13.CrossRefGoogle Scholar
Soliman, K. N. (1953). Studies on the bionomics of the preparasitic stages of Dietyocaulus viviparus with reference to the same in the allied species iii sheep D. filaria. British Veterinary Journal 109, 364–81.Google Scholar