Dormancy and germination in a guild of sonoran desert annuals

Sandy Adondakis, D. Lawrence Venable

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

To investigate bet hedging and species coexistence in a guild of Sonoran Desert winter annuals, we subjected seeds of eight species to factorial combinations of summer treatments (varying temperature and precipitation), germination conditions (representative of early, middle, and late germination season temperatures and day lengths), and experiment trial dates (spanning the germination season). In keeping with bet hedging theory, we found that many viable seeds would not germinate in response to any combination of treatments (germination usually <50%). In keeping with the storage effect model, we found that these coexisting species differed in their germination response to our experimental manipulations and also differed in how the experimental variables interact. Field germination data from a long-term project on population and community dynamics of this guild show that germination fractions are similar between field and growth chamber and that species that tend to germinate under early season conditions in the growth chamber also tend to do so under unmanipulated field conditions. Some species are nondormant during the summer and only acquire dormancy at the onset of the autumn germination season, while others appear to have either innate or conditional dormancy until the onset of the germination season.

Original languageEnglish (US)
Pages (from-to)2582-2590
Number of pages9
JournalEcology
Volume85
Issue number9
DOIs
StatePublished - Sep 2004

Keywords

  • Bet hedging
  • Conditional dormancy
  • Desert annual
  • Early germination
  • Secondary dormancy
  • Seed heteromorphism
  • Species coexistence

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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