Evolution of morphological integration: Developmental accommodation of stress-induced variation

Alexander Badyaev, Kerry R. Foresman, Rebecca L. Young

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Extreme environmental change during growth often results in an increase in developmental abnormalities in the morphology of an organism. The evolutionary significance of such stress-induced variation depends on the recurrence of a stressor and on the degree to which developmental errors can be accommodated by an organism's ontogeny without significant loss of function. We subjected populations of four species of soricid shrews to an extreme environment during growth and measured changes in the patterns of integration and accommodation of stress-induced developmental errors in a complex of mandibular traits. Adults that grew under an extreme environment had lower integration of morphological variation among mandibular traits and highly elevated fluctuating asymmetry in these traits, compared to individuals that grew under the control conditions. However, traits differed strongly in the magnitude of response to a stressor - traits within attachments of the same muscle (functionally integrated traits) had lower response and changed their integration less than other traits. Cohesiveness in functionally integrated complexes of traits under stress was maintained by close covariation of their developmental variation. Such developmental accommodation of stress-induced variation might enable the individual's functioning and persistence under extreme environmental conditions and thus provides a link between individual adaptation to stress and the evolution of stress resistance.

Original languageEnglish (US)
Pages (from-to)382-395
Number of pages14
JournalAmerican Naturalist
Volume166
Issue number3
DOIs
StatePublished - Sep 2005

Fingerprint

shrews
organisms
abnormal development
cohesion
stress tolerance
ontogeny
muscles
environmental factors
stress resistance
fluctuating asymmetry
abnormality
environmental change
muscle
persistence
environmental conditions
organism
loss

Keywords

  • Developmental plasticity
  • Functional integration
  • Modularity
  • Sorex
  • Stress
  • Variation

ASJC Scopus subject areas

  • Ecology

Cite this

Evolution of morphological integration : Developmental accommodation of stress-induced variation. / Badyaev, Alexander; Foresman, Kerry R.; Young, Rebecca L.

In: American Naturalist, Vol. 166, No. 3, 09.2005, p. 382-395.

Research output: Contribution to journalArticle

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