References
Ashton, F.T. and Schad, G.A. (1996) Amphids inStrongyloides stercoralisand
other parasitic nematodes.Parasitology Today12, 187–194.
Ashton, F.T., Bhopale, V.M., Holt, D., Smith, G. and Schad, G.A. (1998) Develop-
mental switching in the parasitic nematode Strongyloides stercoralisis
controlled by the ASF and ASI amphidial neurons.Journal of Parasitology84,
691–695.
Bargmann, C.I. and Mori, I. (1997) Chemotaxis and thermotaxis. In: Riddle, D.L.,
Blumenthal, T., Meyer, B.J. and Priess, J.R. (eds) C. elegansII. Cold Spring
Harbor Laboratory Press, Cold Spring Harbor, New York, pp. 717–737.
Barton, N.H. and Charlesworth, B. (1998) Why sex and recombination?Science
281, 1986–1990.
Behnke, J.M., Hannah, J. and Pritchard, D. (1983)Nematospiroides dubiusin the
mouse: evidence that adult worms depress the expression of homologous
immunity.Parasite Immunology5, 397–408.
Blackman, R.L. (1974)Aphids. Ginn, London, 175 pp.
Blackman, R.L. (1980) Chromosomes and parthenogenesis in aphids. In:
Blackman, R.L., Hewitt, G.M. and Ashburner, M. (eds) Insect Cyto-
genetics,10th Symposium, Royal Entomological Society. Blackwell, Oxford,
pp. 133–148.
Coadwell, W.J. and Ward, P.F.V. (1977) Annual variation in the growth of
Haemonchus contortusin experimental infections of sheep and its relation to
arrested development.Parasitology74, 121–132.
Frank, G.R., Herd, R.P., Marbury, K.S. and Williams, J.C. (1986) Effects of
transfer ofOstertagia ostertagibetween northern and southern USA on the
pattern and frequency of hypobiosis.International Journal for Parasitology
16, 391–398.
Gibbs, H.C. (1986) Hypobiosis in parasitic nematodes – an update.Advances in
Parasitology25, 129–174.
Golden, J.W. and Riddle, D.L. (1984) A pheromone-induced developmental switch
inCaenorhabditis elegans: temperature-sensitive mutants reveal a wild-type
temperature dependent process.Proceedings of the National Academy of
Sciences USA81, 819–823.
Goldstein, P. and Curtis, M. (1987) Age-related changes in the meiotic chromo-
somes of the nematodeCaenorhabditis elegans. Mechanisms of Ageing and
Development40, 115–130.
Grove, D.I., Heenan, P.J. and Northern, C. (1983) Persistent and disseminated
infections ofStrongyloides stercoralis in immunosuppressed dogs.Inter-
national Journal for Parasitology13, 483–490.
Harvey, S.C. and Viney, M.E. (2001) Sex determination in the parasitic nematode
Strongyloides ratti.Genetics158, 1527–1533.
Harvey, S.C., Gemmill, A.W., Read, A.F. and Viney, M.E. (2000) The control of
morph development in the parasitic nematodeStrongyloides ratti. Proceed-
ings of the Royal Society of London Series B267, 2057–2063.
Herbert, P.D.N. (1987) Genotypic characteristics of cyclic parthenogens and their
obligatory asexual derivatives. In: Stearns, S.C. (ed.)The Evolution of Sex and
its Consequences. Birkhauser Verlag, Basle, pp. 175–195.
Hodgkin, J. (1988) Sexual dimorphism and sex determination. In: Wood, W.B.
(ed.)The NematodeCaenorhabditis elegans. Cold Spring Harbor Laboratory,
Cold Spring Harbor, New York, pp. 243–279.126 M.E. Viney