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Weather-mediated regulation of olive scale by two parasitoids

  1. Jacques Rochat1,2,
  2. Andrew Paul Gutierrez2,*

Article first published online: 26 MAR 2002

DOI: 10.1046/j.1365-2656.2001.00505.x

Issue

Journal of Animal Ecology

Journal of Animal Ecology

Volume 70, Issue 3, pages 476–490, May 2001

Additional Information

How to Cite

Rochat, J. and Gutierrez, A. P. (2001), Weather-mediated regulation of olive scale by two parasitoids. Journal of Animal Ecology, 70: 476–490. doi: 10.1046/j.1365-2656.2001.00505.x

Author Information

  1. 1

    INRA, Unité Santé des Plantes et Environnement, 37 bd. du Cap, 06600 Antibes, France; and

  2. 2

    Ecosystem Science, 151 Hilgard Hall, University of California, Berkeley, CA 94720, USA

* Dr A.P. Gutierrez, University of California, Ecosystem Science, 151 Hilgards Hall, Berkeley, CA 94720, USA. Fax: 1 (510) 643–5098.Carpediem@Nature.Berkeley.Edu

Publication History

  1. Issue published online: 26 MAR 2002
  2. Article first published online: 26 MAR 2002

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Keywords:

  • age structure;
  • interspecific competition;
  • physiologically based models;
  • population dynamics;
  • temperature effects

Summary

  • 1
     The effects of temperature and interspecific competition among two parasitoids (Aphytis maculicornis (=paramaculicornis) (Masi)–Coccophagoides utilis Doutt) of the olive scale (Parlatoria oleae (Colvée)) were examined, and the reason for the successful biological control of olive scale explained.
  • 2
     An age-structure distributed maturation time model of this system was developed that simplifies many of the details of prior physiologically based models.
  • 3
     Temperature-dependent physiological indices were used to scale fecundity and survivorship rates from their maximum values.
  • 4
     The distributed maturation time population dynamics model captured the variance in temperature-related development times required to simulate the dynamics of the system.
  • 5
     A type III ratio-dependent functional response was used to estimate parasitism rate on olive scale and also served to stabilize our single patch model.
  • 6
     The model confirms the Huffaker & Kennett (1966) conclusions concerning the role of weather and the relative contribution of the two parasitoids in the regulation of olive scale in California olive.
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