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Density dependence and regulation in the systemNezara viridula (L.) (Hemiptera: Pentatomidae), host andTrichopoda giacomellii (Blanchard) (Diptera: Tachinidae), parasitoid

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Summary

The system formed byN. viridula and its almost specific parasitoidT. giacomellii has been studied in the Buenos Aires province, Argentina for 26 generations of the former and 20 generations of the latter. An intensive study over 9 host generations and key factor analysis made possible the identification and quantification of different mortality factors. The main factors determining the fluctuations in total generation mortality were: egg mortality due mainly to parasitism byT. basalis; nymphal predation on 1st, 2nd and 3rd instar nymphs and migration; and adult mortality and reduction on potential natality due to parasitism byT. giacomellii. Adult mortality and reduction of potential natality, due to parasitism byT. giacomellii, was density dependent. This factor is capable of maintaining the simulations generated by a simple model based on key factor analysis, within the range of observed densities. These results suggest that parasitism byT. giacomellii can regulate the population, even in a small area of 450 m2.

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Authors and Affiliations

  1. Museo de La Plata, Argentina

    Gerardo Liljesthröm

  2. Laboratoire de Biométrie, Université Claude Bernard, Lyon 1, 69622, Villeurbanne Cedex, France

    Gerardo Liljesthröm & Carlos Bernstein

Authors
  1. Gerardo Liljesthröm
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  2. Carlos Bernstein
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Liljesthröm, G., Bernstein, C. Density dependence and regulation in the systemNezara viridula (L.) (Hemiptera: Pentatomidae), host andTrichopoda giacomellii (Blanchard) (Diptera: Tachinidae), parasitoid. Oecologia 84, 45–52 (1990). https://doi.org/10.1007/BF00665593

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  • DOI: https://doi.org/10.1007/BF00665593

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