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Ontogenetic stage-specific reciprocal intraguild predation.

Morgana Maria Fonseca1, Angelo Pallini1, Eraldo Lima1

  • 1Department of Entomology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil.

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|September 3, 2018
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Summary
This summary is machine-generated.

Intraguild predation between two predatory mite species depends on the life stage of the mites. Juveniles of one species preyed on eggs of the other, while adults did not, showing stage-specific interactions are crucial.

Keywords:
Biological controlOntogenetic diet shiftsPredatory mitesPredator–predator interactionsStage structure

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Area of Science:

  • Ecology
  • Predator-prey dynamics
  • Interspecific interactions

Background:

  • Ecological interaction outcomes are influenced by the size and life stage of interacting individuals.
  • Intraguild predation, where competitors prey on each other, is significantly affected by ontogenetic stage.
  • Studying these stage-specific interactions is vital but challenging in species with complex life cycles.

Purpose of the Study:

  • To investigate the intraguild predatory interactions between all feeding stages of two predatory mite species: Neoseiulus californicus and Phytoseiulus macropilis.
  • To evaluate the capacity of each species' stages to kill and consume stages of the other species.
  • To determine the role of ontogeny in mediating intraguild predation dynamics.

Main Methods:

  • Examined predatory interactions across all life stages (larva, nymph, adult) of Neoseiulus californicus and Phytoseiulus macropilis.
  • Assessed the ability of each mite species' stages to prey on different stages of the competitor species.
  • Quantified the nutritional benefit derived from consuming competitor stages, a prerequisite for intraguild predation.

Main Results:

  • Ontogenetic stage critically influenced intraguild predation. Juvenile Phytoseiulus macropilis successfully developed when feeding on Neoseiulus californicus eggs.
  • Adult female Phytoseiulus macropilis did not prey on smaller developmental stages of Neoseiulus californicus.
  • Intraguild predation was reciprocal: both juvenile and adult Neoseiulus californicus preyed on the smallest stages of Phytoseiulus macropilis.

Conclusions:

  • A comprehensive understanding of intraguild predation requires analyzing interactions among all ontogenetic stages of the involved species.
  • Size and life stage are critical determinants in the outcome of intraguild predation between Neoseiulus californicus and Phytoseiulus macropilis.
  • Future ecological models of intraguild predation should incorporate stage-specific interaction data for accurate predictions.