DOI: 10.1111/ele.12655
Scopus记录号: 2-s2.0-84991273853
论文题名: Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment
作者: Gremer J.R. ; Kimball S. ; Venable D.L.
刊名: Ecology letters
ISSN: 14610248
EISSN: 1461-0248
出版年: 2016
卷: 19, 期: 10 起始页码: 1209
结束页码: 1218
语种: 英语
英文关键词: Bet hedging
; density dependence
; desert annuals
; dormancy
; evolutionarily stable strategies
; integrated strategies
; population dynamic models
; predictive plasticity
; seed bank
; within-year germination
Scopus关键词: biological model
; classification
; desert climate
; ecosystem
; evolution
; germination
; physiology
; plant
; plant seed
; season
; Biological Evolution
; Desert Climate
; Ecosystem
; Germination
; Models, Biological
; Plants
; Seasons
; Seeds
英文摘要: In variable environments, organisms must have strategies to ensure fitness as conditions change. For plants, germination can time emergence with favourable conditions for later growth and reproduction (predictive germination), spread the risk of unfavourable conditions (bet hedging) or both (integrated strategies). Here we explored the adaptive value of within- and among-year germination timing for 12 species of Sonoran Desert winter annual plants. We parameterised models with long-term demographic data to predict optimal germination fractions and compared them to observed germination. At both temporal scales we found that bet hedging is beneficial and that predicted optimal strategies corresponded well with observed germination. We also found substantial fitness benefits to varying germination timing, suggesting some degree of predictive germination in nature. However, predictive germination was imperfect, calling for some degree of bet hedging. Together, our results suggest that desert winter annuals have integrated strategies combining both predictive plasticity and bet hedging. © 2016 John Wiley & Sons Ltd/CNRS. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/107711
Appears in Collections: 气候减缓与适应
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作者单位: Department of Evolution and Ecology, University of California, Davis, CA, 95616, USA; Center for Environmental Biology, University of California, Irvine, CA, 92697, USA; Department Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, 85721, USA
Recommended Citation:
Gremer J.R.,Kimball S.,Venable D.L.. Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment[J]. Ecology letters,2016-01-01,19(10)