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A Gut Analysis Technique for Pinpointing Egg-Specific Predation Events.

James R Hagler1, Ayman M Mostafa2

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|June 8, 2019
PubMed
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A new universal food immunomarking technique (UFIT) detects predation on Lygus hesperus eggs. This method revealed predators consumed more exposed eggs than concealed ones, with Collops vittatus being a more voracious predator than Hippodamia convergens.

Keywords:
enzyme-linked immunosorbent assayimmunomarkingwestern tarnished plant bug

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Area of Science:

  • Agricultural Entomology
  • Predator-Prey Interactions
  • Molecular Ecology

Background:

  • Lygus hesperus is a significant agricultural pest.
  • Understanding predator-prey dynamics is crucial for integrated pest management.
  • Accurate detection of predation events is vital for ecological studies.

Purpose of the Study:

  • To describe a universal food immunomarking technique (UFIT) for detecting predation on Lygus hesperus eggs.
  • To investigate predator feeding preferences between endophytic (concealed) and exophytic (exposed) L. hesperus eggs.
  • To compare the predation rates of Collops vittatus and Hippodamia convergens on L. hesperus eggs.

Main Methods:

  • Development of UFIT using rabbit and chicken sera proteins to mark L. hesperus eggs.
  • Application of enzyme-linked immunosorbent assay (ELISA) for postmortem gut content analysis.
  • Conducting predator feeding choice studies with simulated endophytic and exophytic egg treatments.

Main Results:

  • Protein-marked egg remnants were detectable in predators for 3–6 hours post-feeding using UFIT and ELISA.
  • Predators consumed significantly higher proportions of exophytic (exposed) L. hesperus eggs compared to endophytic (concealed) eggs.
  • L. hesperus eggs were more vulnerable to predation by Collops vittatus than by Hippodamia convergens.

Conclusions:

  • UFIT is an effective method for identifying specific predator feeding activity on insect egg stages.
  • Egg exposure (endophytic vs. exophytic) significantly influences predation vulnerability.
  • Differential predation rates by C. vittatus and H. convergens highlight their varying roles in L. hesperus population regulation.