Ecdysteroid hormones link the juvenile environment to alternative adult life histories in a seasonal insect

V. Oostra, A.R.A. Mateus, K.R.L. van den Burg, T. Piessens, M. van Eijk, P.M. Brakefield, P. Beldade, B.J. Zwaan

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

The conditional expression of alternative life strategies is a widespread feature of animal life and a pivotal adaptation to life in seasonal environments. To optimally match suites of traits to seasonally changing ecological opportunities, animals living in seasonal environments need mechanisms linking information on environmental quality to resource allocation decisions. The butterfly Bicyclus anynana expresses alternative adult life histories in the alternating wet and dry seasons of its habitat as endpoints of divergent developmental pathways triggered by seasonal variation in preadult temperature. Pupal ecdysteroid hormone titers are correlated with the seasonal environment, but whether they play a functional role in coordinating the coupling of adult traits in the alternative life histories is unknown. Here, we show that manipulating pupal ecdysteroid levels is sufficient to mimic in direction and magnitude the shifts in adult reproductive resource allocation normally induced by seasonal temperature. Crucially, this allocation shift is accompanied by changes in ecologically relevant traits, including timing of reproduction, life span, and starvation resistance. Together, our results support a functional role for ecdysteroids during development in mediating strategic reproductive investment decisions in response to predictive indicators of environmental quality. This study provides a physiological mechanism for adaptive developmental plasticity, allowing organisms to cope with variable environments
Original languageEnglish
Pages (from-to)E79-E92
JournalAmerican Naturalist
Volume184
Issue number3
DOIs
Publication statusPublished - 2014

Keywords

  • butterfly bicyclus-anynana
  • drosophila-melanogaster
  • phenotypic plasticity
  • developmental temperature
  • adaptive responses
  • thermal plasticity
  • wing pattern
  • lepidoptera
  • diapause
  • nymphalidae

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