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Nandita Nataraj1, Elisabeth Adam1, Bill S Hansson1

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Female hawkmoths (Manduca sexta) develop oviposition constancy after a single egg-laying experience. This learned preference for specific host plants enhances handling efficiency and impacts choices for at least 24 hours, indicating long-term memory involvement.

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Area of Science:

  • Behavioral Ecology
  • Insect-Plant Interactions
  • Neuroethology

Background:

  • Flower constancy in pollinators enhances foraging efficiency and plant reproduction.
  • Oviposition decisions by insects are crucial for offspring survival and plant population dynamics.

Purpose of the Study:

  • To investigate if prior oviposition experience influences future host plant selection in female insects.
  • To determine the duration and potential mechanisms of oviposition constancy.

Main Methods:

  • Experimental manipulation of oviposition experience in female hawkmoths (Manduca sexta).
  • Choice tests were conducted to assess subsequent host plant preferences.
  • Preference assessments were made at different time intervals post-oviposition.

Main Results:

  • Female hawkmoths demonstrated a significant preference for plant species on which they had previously oviposited.
  • This oviposition constancy was observed even 24 hours after the initial experience.
  • Moths showed increased handling efficiency on previously experienced host plants.

Conclusions:

  • Previous oviposition experience can establish a form of host plant constancy in female hawkmoths.
  • This learned behavior is retained for at least 24 hours, suggesting a role for long-term memory.
  • Oviposition constancy, similar to flower constancy, likely improves foraging efficiency for egg-laying insects.