Investigations on the influence of the predator population density on the rate of oviposition inAmblyseius finlandicus oud. (Acari, phytoseiidae)

  • P. Schausberger
Article

Abstract

Relating to the frequency of occurrenceAmblyseius finlandicus Oud. is the dominating species of the family Phytoseiidae in Austria. Series of experiments have been made in the laboratory to investigate the influence of the predator population density on the rate of oviposition.

In spite of sufficient food supply the rate of reproduction decreased with an increasing number of mites per rearing unit. Single kept females had rates of oviposition (1.9 eggs/day/female) significantly different from females kept in groups (2, 5 or 8 mites per unit with 1.6, 1.2 and 1.1 eggs/day/female).

Keywords

Plant Physiology Population Density Plant Pathology Food Supply Predator Population 

Zusammenfassung

Amblyseius finlandicus Oud. ist bezüglich der Häufigkeit des Auftretens die vorherrschende Phytoseiidenart in Österreich. In einer Reihe von Experimenten wurde der Einfluß der Populationsdichte auf die Ovipositionsrate der Raubmilbe untersucht. Trotz ausreichendem Nahrungsangebot sank die Ovipositions-rate mit zunehmender Individuenzahl pro Käfig ab. Einzeln gehaltene Tiere legten (mit 1,9 Eiern/Tag/Weibchen) signifikant mehr Eier ab als in Gruppen zu 2, 5 oder 8 gehaltene (mit 1,6, 1,2 und 1,1 Eiern/Tag/Weibchen).

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Berner, M., 1990: Untersuchungen zur Biologie vonTyphlodromus tiliarum (Oudemans) undTyphlodromus pyri Scheuten (Acarina: Phytoseiidae). Diss. Univ. Wien.Google Scholar
  2. El Borolossy, M., 1988: Untersuchungen über die Verbreitung verschiedener Raubmilbenarten in österreichischen Obstanbaugebieten. Diss. Univ. f. Bodenkultur Wien.Google Scholar
  3. El Borolossy, M.;Fischer Colbrie, P., 1989: Untersuchungen zum Artenspektrum von Raubmilben im österreichischen Obst- und Weinbau. Pflanzenschutzberichte50 (2), 49–63.Google Scholar
  4. Eveleigh, E. S.;Chant, D. A., 1981: Experimental studies on acarine predator — prey interactions: effect of predator age and feeding history on prey consumption and the functional response. Can. J. Zool.59 (7), 1387–1406.Google Scholar
  5. Eveleigh, E. S.;Chant, D. A., 1982: Experimental studies on acarine predator — prey interactions: the effects of predator density on immature survival, adult fecundity and emigration rates, and the numerical response to prey density (Acarina: Phytoseiidae). Can. J. Zool.60 (4), 630–638.Google Scholar
  6. Everson, P., 1980: The relative activity and functional response ofPhytoseiulus persimilis andTetranychus urticae: the effect of temperature. The Canad. Entom.112 (1), 17–25.Google Scholar
  7. Fernando, M.;Hassell, M. P., 1980: Predator — prey responses in an acarine system. Res. Popul. Ecol.22, 301–322.Google Scholar
  8. Helle, W.;Sabelis, M. W. (edit.), 1985: Spider mites, their biology, natural enemies and control, Vol. 1B. Elsevier Amsterdam-Oxford-New York-Tokio 1985.Google Scholar
  9. Huffaker, C. B.;van de Vrie, M.;McMurtry, J. A., 1969: The ecology of tetranychid mites and their natural control. Ann. Rev. Ent.14, 125–174.CrossRefGoogle Scholar
  10. Kaiser, H., 1983: Small scale spatial heterogeneity influences predation success in an unexpected way: Model experiments on the functional response of predatory mites. Oecologia56, 249–256.CrossRefGoogle Scholar
  11. Krantz, G. W., 1978: A Manual of Acarology, 2nd ed. Oregon State Univ. Book Stores, Corvallis, Oregon, 509 pp.Google Scholar
  12. Kuchlein, J. H., 1966. Mutual interference among the predacious miteTyphlodromus longipilus. I. Effects of predator density on oviposition rate and migration tendency. Meded. Rijksfac. Lanbouwwet. Gent31, 740–746.Google Scholar
  13. Rabbinge, R., 1976: Biological control of the fruit tree red spider mite, Simul. Monog., Pudoc, Wageningen, 228 pp.Google Scholar
  14. Sandness, J. N.;McMurtry, J. A., 1970: Functional response of three species of Phytoseiidae (Acarina) to prey density. Can. Entomol.102, 692–704.Google Scholar
  15. Schausberger, P., 1990: Untersuchungen zur Biologie vonAmblyseius aberrans Oud. undAmblyseius finlandicus Oud. (Gamasida: Phytoseiidae). Diss. Univ. Wien.Google Scholar
  16. Schausberger, P., 1992: Vergleichende Untersuchungen über den Einfluß verschiedener Nahrung auf die Praeimaginalent-wicklung und die Reproduktion vonAmblyseius aberrans Oud. undAmblyseius finlandicus Oud. (Acarina: Phytoseiidae). Z. ang. Ent. (in Druck).Google Scholar
  17. Takafuji, A.;Chant, D. A., 1976: Comparative studies on two species of predacious mites (Acarina: Phytoseiidae) with special reference to their responses to the density of prey. Res. Popul. Ecol.17, 255–310.Google Scholar

Copyright information

© Verlag Paul Parey 1992

Authors and Affiliations

  • P. Schausberger
    • 1
  1. 1.Wien

Personalised recommendations