气候变化领域集成服务门户(CCPortal): Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment

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DOI	10.1111/ele.12655
	Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment
	Gremer J.R.; Kimball S.; Venable D.L.
发表日期	2016
ISSN	1461-023X
EISSN	1461-0248
卷号	19 期号:10
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.
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
学科领域	biological model; classification; desert climate; ecosystem; evolution; germination; physiology; plant; plant seed; season; Biological Evolution; Desert Climate; Ecosystem; Germination; Models, Biological; Plants; Seasons; Seeds
语种	英语
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
来源期刊	Ecology letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118481
作者单位	Department of Evolution and Ecology, University of California, Davis, CA, 95616, USA, United States; Center for Environmental Biology, University of California, Irvine, CA, 92697, USA, United States; Department Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, 85721, USA, United States
推荐引用方式 GB/T 7714	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],2016,19(10).
APA	Gremer J.R.,Kimball S.,&Venable D.L..(2016).Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment.Ecology letters,19(10).
MLA	Gremer J.R.,et al."Within-and among-year germination in Sonoran Desert winter annuals: bet hedging and predictive germination in a variable environment".Ecology letters 19.10(2016).