Life history reaction norms to time constraints in a damselfly: differential effects on size and mass

  • Strobbe F
  • Stoks R
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Abstract

Optimality models predict that, under a time constraint, organisms should accelerate development, and preferably so by increasing growth rate, to keep size at emergence constant. Unfortunately, most tests did neglect genetic constraints and interchanged mass with body size which may explain mixed support for some of the models' predictions. We imposed time constraints on full sibling larvae of the damselfly Enallagmacyathigerum by manipulating day length regimes. Under a time constraint, larval development and growth rate based on size indeed were faster. This made it possible to keep size at emergence constant, despite the shorter development time. Interestingly, under a time constraint, growth rate based on mass was not increased and larvae had a lower mass at emergence. We see two reasons for this difference between body mass and size. First, size is fixed at emergence, while mass can still increase in many insects. Secondly, genetic constraints may have contributed to different responses for size and mass. In general, our results strongly suggest discriminating between size and mass when testing life history responses.c 2004 The Linnean Society of London, Biological Journal of the Linnean Society, 2004, 83, 187-196

Author-supplied keywords

  • Damselflies
  • Larval
  • Larval Development
  • Mass
  • Responses
  • TESTS
  • body
  • body mass
  • body size
  • constraints
  • damselfly
  • development
  • development time
  • effects
  • effects on
  • emergence
  • growth
  • growth rate
  • history
  • insect
  • insects
  • larvae
  • length
  • life history
  • life-history
  • model
  • models
  • optimality
  • reaction norm
  • size
  • testing
  • time constraint

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Authors

  • F Strobbe

  • Robby Stoks

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