Dormancy and germination in a guild of sonoran desert annuals

Sandy Adondakis, David L Venable

Research output: Contribution to journalArticle

78 Citations (Scopus)

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
StatePublished - Sep 2004

Fingerprint

Sonoran Desert
dormancy
guild
germination
desert
bet-hedging
growth chambers
seed
day length
summer
community dynamics
seeds
coexistence
population dynamics
temperature
photoperiod
autumn
winter

Keywords

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

ASJC Scopus subject areas

  • Ecology

Cite this

Dormancy and germination in a guild of sonoran desert annuals. / Adondakis, Sandy; Venable, David L.

In: Ecology, Vol. 85, No. 9, 09.2004, p. 2582-2590.

Research output: Contribution to journalArticle

Adondakis, S & Venable, DL 2004, 'Dormancy and germination in a guild of sonoran desert annuals', Ecology, vol. 85, no. 9, pp. 2582-2590.
Adondakis, Sandy ; Venable, David L. / Dormancy and germination in a guild of sonoran desert annuals. In: Ecology. 2004 ; Vol. 85, No. 9. pp. 2582-2590.
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