How did the swiss cheese plant get its holes?

Am Nat. 2013 Feb;181(2):273-81. doi: 10.1086/668819. Epub 2012 Dec 26.

Abstract

Adult leaf fenestration in "Swiss cheese" plants (Monstera Adans.) is an unusual leaf shape trait lacking a convincing evolutionary explanation. Monstera are secondary hemiepiphytes that inhabit the understory of tropical rainforests, where photosynthesis from sunflecks often makes up a large proportion of daily carbon assimilation. Here I present a simple model of leaf-level photosynthesis and whole-plant canopy dynamics in a stochastic light environment. The model demonstrates that leaf fenestration can reduce the variance in plant growth and thereby increase geometric mean fitness. This growth-variance hypothesis also suggests explanations for conspicuous ontogenetic changes in leaf morphology (heteroblasty) in Monstera, as well as the absence of leaf fenestration in co-occurring juvenile tree species. The model provides a testable hypothesis of the adaptive significance of a unique leaf shape and illustrates how variance in growth rate could be an important factor shaping plant morphology and physiology.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adaptation, Biological / physiology*
  • Araceae / anatomy & histology*
  • Araceae / growth & development
  • Biological Evolution*
  • Ecosystem*
  • Genetic Fitness / genetics
  • Light
  • Models, Biological*
  • Photosynthesis / physiology*
  • Plant Leaves / anatomy & histology*
  • Plant Leaves / physiology