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Juvenile leg autotomy predicts adult male morph in a New Zealand harvestman with weapon polymorphism

Author

Listed:
  • Erin C Powell
  • Christina J Painting
  • Glauco Machado
  • Gregory I Holwell

Abstract

Intraspecific weapon polymorphisms that arise via conditional thresholds may be affected by juvenile experience such as predator encounters, yet this idea has rarely been tested. The New Zealand harvestman Forsteropsalis pureora has three male morphs: majors (alphas and betas) are large-bodied with large chelicerae used in male–male contests, while minors (gammas) are small-bodied with small chelicerae and scramble to find mates. Individuals use leg autotomy to escape predators and there is no regeneration of the missing leg. Here, we tested whether juvenile experience affects adult morph using leg autotomy scars as a proxy of predator encounters. Juvenile males that lost at least one leg (with either locomotory or sensory function) had a 45 times higher probability of becoming a minor morph at adulthood than intact juvenile males. Leg loss during development may affect foraging, locomotion, and/or physiology, potentially linking a juvenile’s predator encounters to their final adult morph and future reproductive tactic.

Suggested Citation

  • Erin C Powell & Christina J Painting & Glauco Machado & Gregory I Holwell, 2023. "Juvenile leg autotomy predicts adult male morph in a New Zealand harvestman with weapon polymorphism," Behavioral Ecology, International Society for Behavioral Ecology, vol. 34(4), pages 613-620.
    • Handle: RePEc:oup:beheco:v:34:y:2023:i:4:p:613-620.
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    File URL: http://hdl.handle.net/10.1093/beheco/arad029
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    References listed on IDEAS

    as
    1. Christina J Painting & Gregory I Holwell, 2013. "Exaggerated Trait Allometry, Compensation and Trade-Offs in the New Zealand Giraffe Weevil (Lasiorhynchus barbicornis)," PLOS ONE, Public Library of Science, vol. 8(11), pages 1-1, November.
    2. Roberto Munguía-Steyer & Bruno A. Buzatto & Glauco Machado, 2012. "Male dimorphism of a neotropical arachnid: harem size, sneaker opportunities, and gonadal investment," Behavioral Ecology, International Society for Behavioral Ecology, vol. 23(4), pages 827-835.
    3. Tara Lynne Maginnis, 2006. "The costs of autotomy and regeneration in animals: a review and framework for future research," Behavioral Ecology, International Society for Behavioral Ecology, vol. 17(5), pages 857-872, September.
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