Arid
DOI10.1111/jeb.12474
Why wait? Three mechanisms selecting for environment-dependent developmental delays
Scott, M. F.1; Otto, S. P.2
通讯作者Scott, M. F.
来源期刊JOURNAL OF EVOLUTIONARY BIOLOGY
ISSN1010-061X
EISSN1420-9101
出版年2014
卷号27期号:10页码:2219-2232
英文摘要

Many species delay development unless particular environments or rare disturbance events occur. How can such a strategy be favoured over continued development? Typically, it is assumed that continued development (e.g. germination) is not advantageous in environments that have low juvenile/seedling survival (mechanism 1), either due to abiotic or competitive effects. However, it has not previously been shown how low early survival must be in order to favour environment-specific developmental delays for long-lived species. Using seed dormancy as an example of developmental delays, we identify a threshold level of seedling survival in bad’ environments below which selection can favour germination that is limited to good’ environments. This can be used to evaluate whether observed differences in seedling survival are sufficient to favour conditional germination. We also present mathematical models that demonstrate two other, often overlooked, mechanisms that can favour conditional germination in the absence of differences in seedling survival. Specifically, physiological trade-offs can make it difficult to have germination rates that are equally high in all environments (mechanism 2). We show that such trade-offs can either favour conditional germination or intermediate (mixed) strategies, depending on the trade-off shape. Finally, germination in every year increases the likelihood that some individuals are killed in population-scale disturbances before reproducing; it can thus be favourable to only germinate immediately after a disturbance (mechanism 3). We demonstrate how demographic data can be used to evaluate these selection pressures. By presenting these three mechanisms and the conditions that favour conditional germination in each case, we provide three hypotheses that can be tested as explanations for the evolution of environment-dependent developmental delays.


英文关键词developmental delays disturbance environmental variation germination strategies life-history evolution modelling seed dormancy serotiny
类型Article
语种英语
国家Canada
收录类别SCI-E
WOS记录号WOS:000343920900017
WOS关键词RANDOMLY VARYING ENVIRONMENTS ; ESS GERMINATION STRATEGIES ; LIFE-HISTORY EVOLUTION ; CANOPY SEED STORAGE ; VARIABLE ENVIRONMENTS ; DESERT ANNUALS ; OPTIMIZING REPRODUCTION ; UNCERTAIN ENVIRONMENTS ; NATURAL-POPULATIONS ; FIRE BEHAVIOR
WOS类目Ecology ; Evolutionary Biology ; Genetics & Heredity
WOS研究方向Environmental Sciences & Ecology ; Evolutionary Biology ; Genetics & Heredity
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183273
作者单位1.Univ British Columbia, Dept Bot, Vancouver, BC V6T 1Z4, Canada;
2.Univ British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada
推荐引用方式
GB/T 7714
Scott, M. F.,Otto, S. P.. Why wait? Three mechanisms selecting for environment-dependent developmental delays[J],2014,27(10):2219-2232.
APA Scott, M. F.,&Otto, S. P..(2014).Why wait? Three mechanisms selecting for environment-dependent developmental delays.JOURNAL OF EVOLUTIONARY BIOLOGY,27(10),2219-2232.
MLA Scott, M. F.,et al."Why wait? Three mechanisms selecting for environment-dependent developmental delays".JOURNAL OF EVOLUTIONARY BIOLOGY 27.10(2014):2219-2232.
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