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Related Experiment Video

Updated: Mar 6, 2026

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Roles for structural and temporal shelter-changing by fern-feeding lepidopteran larvae.

T E Ruehlmann1, R W Matthews1, J R Matthews2

  • 1Department of Zoology, The University of Georgia, 30602, Athens, GA, USA.

Oecologia
|March 18, 2017
PubMed
Summary

Larvae of the pyralid moth Herpetogramma aeglealis build 3 shelter types on Christmas ferns. This behavior helps them avoid predators and find palatable food as they mature.

Keywords:
Feeding sheltersHerpetogrammaInsect-plant interactionsPolystichum

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Area of Science:

  • Entomology
  • Plant-insect interactions
  • Behavioral ecology

Background:

  • Larvae of the pyralid moth, Herpetogramma aeglealis, are known to construct shelters on Christmas fern, Polystichum acrostichoides.
  • Understanding the specifics of their shelter construction and usage is crucial for comprehending their life cycle and ecological role.

Purpose of the Study:

  • To investigate the sequential shelter construction and usage by Herpetogramma aeglealis larvae throughout their development.
  • To characterize the different shelter types and their potential adaptive significance.

Main Methods:

  • Field and laboratory observations of 532 shelters constructed by Herpetogramma aeglealis larvae on Polystichum acrostichoides.
  • Documentation of shelter types, construction timing, and larval occupancy.

Main Results:

  • Larvae inhabit approximately 5 shelters of 3 distinct types (bundle, fiddlehead, globe) sequentially as they mature.
  • Shelters are constructed nocturnally on different fronds, with sterile fronds preferred over fertile ones.
  • Bundle and fiddlehead shelters offer crypsis, while globe shelters are conspicuous but may deter predators through persistence.

Conclusions:

  • The construction of multiple, diverse shelters by Herpetogramma aeglealis larvae is a complex strategy potentially balancing energetic costs with benefits.
  • This behavior likely enhances survival by circumventing reduced frond palatability and minimizing exposure to predators and parasites.
  • Shelter site selection and morphology play key roles in the life history of this pyralid moth.