Atmospheric hypoxia limits selection for large body size in insects

C. Jaco Klok, Jon Harrison

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Background: The correlations between Phanerozoic atmospheric oxygen fluctuations and insect body size suggest that higher oxygen levels facilitate the evolution of larger size in insects. Methods and Principal Findings: Testing this hypothesis we selected Drosophila melanogaster for large size in three oxygen atmospheric partial pressures (aPO2). Fly body sizes increased by 15% during 11 generations of size selection in 21 and 40 kPa aPO2. However, in 10 kPa aPO2, sizes were strongly reduced. Beginning at the 12th generation, flies were returned to normoxia. All flies had similar, enlarged sizes relative to the starting populations, demonstrating that selection for large size had functionally equivalent genetic effects on size that were independent of aPO2. Significance: Hypoxia provided a physical constraint on body size even in a tiny insect strongly selected for larger mass, supporting the hypothesis that Triassic hypoxia may have contributed to a reduction in insect size.

Original languageEnglish (US)
Article numbere3876
JournalPLoS One
Volume4
Issue number1
DOIs
StatePublished - Jan 7 2009

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Body Size
Insects
hypoxia
body size
Diptera
Oxygen
insects
oxygen
Partial pressure
Atmospheric pressure
Atmospheric Pressure
normoxia
Partial Pressure
Drosophila melanogaster
Testing
Hypoxia
Population
testing
methodology

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Atmospheric hypoxia limits selection for large body size in insects. / Klok, C. Jaco; Harrison, Jon.

In: PLoS One, Vol. 4, No. 1, e3876, 07.01.2009.

Research output: Contribution to journalArticle

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