Experimental & Applied Acarology

, Volume 21, Issue 12, pp 731–746 | Cite as

Bodies of liquid water as a source of water gain for Ixodes ricinus ticks (Acari: Ixodidae)

  • Olaf Kahl
  • Isabel Alidousti
Article

Abstract

It is well established that free-living unfed ticks can compensate for their inevitable body water losses by active water vapour absorption in periods of ambient relative humidity (RH) of greater than 75-90%. Whilst many species of terrestrial arthropods are known to be capable of locating liquid water and drinking when in need, the existing knowledge concerning the ecological significance of bulk water for rehydration in ticks is scarce. In the present laboratory study batches of unfed Ixodes ricinus (larvae, nymphs, and adults) in varying states of (de)hydration were supplied with tapwater either as droplets for 45 min in a Petri dish or in a small trough for 24 h. The body mass of each tick was gravimetrically determined before and after exposure. Though fully hydrated ticks were not usually attracted to liquid water, the response became increasingly positive with a growing body water deficit (p > 0.05). No tick was ever found with its mouthparts inserted into the water, nor had any tick residues of orange G in its alimentary tract when supplied with orange G-coloured water. Linear regression analysis demonstrated that water intake took place in a regulated manner in adult ticks, i.e. the more severely the ticks had been dehydrated the more net water they subsequently gained (p > 0.01). The maximum uptake rates were <20% of the original body mass per day. These findings indicate that unfed I. ricinus do not drink liquid water but are well able to use the high RH in the immediate vicinity of bulk water to actively take up vapour.

Ticks Ixodes ricinus liquid water active water vapour absorption water balance 

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REFERENCES

  1. Edney, E.B. 1977. Water Balance in Land Arthropods. Springer Verlag, Berlin.Google Scholar
  2. Gaede, K. 1991. [Active uptake of water vapour from subsaturated atmospheres in arthropods: sorption kinetics.] Zool. Jahrbücher Physiol. 95: 135–171 (in German).Google Scholar
  3. Gaede, K. and Knülle, W. 1997. Water vapour sorption from unsaturated atmospheres: concerning the mechanism of ticks. J. Exp. Biol. in press.Google Scholar
  4. Hadley, N.F. 1994. Water Relation of Terrestrial Arthropods. Academic Press Inc., London.Google Scholar
  5. Hair, J.A., Sauer, J.R. and Durham, K.A. 1975. Water balance and humidity preference in three species of ticks. J. Med. Entomol. 12: 37–47.Google Scholar
  6. Honzáková, E. 1971. Survival of some ixodid tick species submerged in water in laboratory experiments. Folia Parasitol. 18: 155–159.Google Scholar
  7. Kahl, O. 1989. [Investigations on the water balance of ticks (Acari: Ixodoidea) in the course of their postembryonic development with special reference to active water vapour uptake of the engorged phases.] Doctoral thesis, Free University of Berlin, Germany (in German).Google Scholar
  8. Kahl, O. and Knülle, W. 1988. Water vapour uptake from subsaturated atmospheres by engorged immature ixodid ticks. Exp. Appl. Acarol. 4: 73–83.Google Scholar
  9. Kemp, D.H. and Tatchell, R.J. 1971. The mechanism of feeding and salivation in Boophilus microplus (Canestrini, 1887). Zeitschrift Parasitenkunde 37: 55–69.Google Scholar
  10. Knülle, W. 1966. Equilibrium humidities and survival of some tick larvae. J. Med. Entomol. 2: 335–338.Google Scholar
  11. Knülle, W. 1967. Significance of fluctuating humidities and frequency of blood meals on the survival of the spiny rat mite, Echinolaelaps echidninus (Berlese). J. Med. Entomol. 4: 322–325.Google Scholar
  12. Knülle, W. and Rudolph, D. 1982. Humidity relationships and water balance of ticks. In Physiology of ticks, F.D. Obenchain and R. Galun (eds), pp. 43–70. Pergamon Press, Oxford.Google Scholar
  13. Lees, A.D. 1946. The water balance in Ixodes ricinus L. and certain other species of ticks. Parasitology 37: 1–20.Google Scholar
  14. Lees, A.D. 1948. The sensory physiology of the sheep tick Ixodes ricinus L. J. Exp. Biol. 25: 145–207.Google Scholar
  15. Londt, J.G.H. and Whitehead, G.B. 1972. Ecological studies of larval ticks in South Africa (Acari, Ixodidae). Parasitology 65: 469–490.Google Scholar
  16. Needham, G.R. and Teel, P.D. 1986. Water balance by ticks between bloodmeals. In Morphology, physiology and behavioral biology of ticks, J.R. Sauer and J.A. Hair (eds), pp. 100–151. Ellis Horwood Limited, Chichester.Google Scholar
  17. Oliver, J.H., Jr, Owsley, M.R., Hutcheson, H.J., James, A.M., Chen, C., Irby, W.S., Dotson, E.M. and Mclain, D.K. 1993. Conspecificity of the ticks Ixodes scapularis and Ixodes dammini (Acari, Ixodidae). J. Med. Entomol. 30: 54–63.Google Scholar
  18. Rudolph, D. and Knülle, W. 1974. Site and mechanism of water vapour uptake from the atmosphere in ixodid ticks. Nature London 249(5452): 84–85.Google Scholar
  19. Rudolph, D. and Knülle, W. 1978. Uptake of water vapour from the air: process, site and mechanism in ticks. In Comparative physiology: water, ions and fluid mechanics, K. Schmidt-Nielsen, L. Bolis and S.H.P. Maddrell (eds) pp. 97–113. Cambridge University Press, Cambridge.Google Scholar
  20. Sachs, L. 1992. [Applied Statistics], 7th edn. Springer Verlag, Berlin (in German).Google Scholar
  21. Schuntner, C.A. and Tatchell, R.J. 1970. Drinking by larval cattle ticks, Boophilus microplus. J. Parasitol. 56: 1239–1247.Google Scholar
  22. Sigal, M.D. 1990. The water balance physiology of the lone star tick, Amblyomma americanum (Acari: Ixodoidea), with ecophysiological comparisons to other ixodid species. PhD thesis, Ohio State University, Columbus.Google Scholar
  23. Sonenshine, D.E. 1991. Biology of Ticks, Vol. 1. Oxford University Press, New York.Google Scholar
  24. Splisteser, H. and Tyron, U. 1986. Untersuchungen zu faunistischen Besonderheiten und zur Aktivität von Dermacentor nuttalli in der Mongolischen Volksrepublik. Monatshefte Veterinärmedizin 41: 126–128 (in German).Google Scholar
  25. Wilkinson, P.R. 1953. Observations on the sensory physiology and behaviour of larvae of the cattle tick, Boophilus microplus (Can.) (Acari, Ixodidae). Aust. J. Zool. 1: 345–356.Google Scholar
  26. Wilkinson, P.R. and Wilson, J.T. 1959. Survival of cattle ticks in central Queensland pastures. Aust. J. Agricult. Res. 10: 129–143.Google Scholar
  27. Winston, P.W. and Bates, D.H. 1960. Saturated solutions for the control of humidity in biological research. Ecology 41: 232–237.Google Scholar
  28. Yoder, J.A. and Spielman, A. 1992. Differential capacity of larval deer ticks (Ixodes dammini) to imbibe water from subsaturated air. J. Insect Physiol. 38: 863–869.Google Scholar

Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • Olaf Kahl
    • 1
  • Isabel Alidousti
    • 1
  1. 1.Institute of Zoology, Applied Zoology/Animal EcologyFree University of BerlinBerlinGermany

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