The influence of life‐history strategy on ecosystem sensitivity to resource fluctuations
The influence of life‐history strategy on ecosystem sensitivity to resource fluctuations
复制标题
生命历史策略对生态系统对资源波动敏感性的影响
DOI：
10.1111/1365-2745.13779
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发表时间：
2021
影响因子：
5.5
通讯作者：
Adler, Peter B.
中科院分区：
文献类型：
--
作者：
Felton, Andrew J.;Snyder, Robin E.;Shriver, Robert K.;Suding, Katharine N.;Adler, Peter B.
为了应对环境的不确定性和可变性，植物进化出不同的生活史策略，将不同的能量分配给生长、生存和繁殖力。这些生活史策略的差异可能潜在地影响生态系统水平的动态，如初级生产对资源波动的敏感性。然而，进化和生态系统动力学之间的联系还没有得到很好的理解。我们使用年度植物种群模型来询问，植物生活史策略的差异何时可能导致初级生产对资源波动的敏感性差异？与现有理论一致，我们发现高度可变和不可预测的环境导致保守策略的进化，其特征是相对较低且不变的发芽分数，而可变但可预测的环境则倾向于更具风险的策略，其特征是更可变的发芽分数。出乎意料的是，我们发现生活史策略对生产对资源波动的敏感性的影响取决于竞争相互作用，特别是生产饱和的速度与竞争个体的数量。快速饱和压倒了生活史策略的影响，但当产量饱和较慢时，风险策略转化为高灵敏度，而保守策略转化为低灵敏度。来自索诺兰沙漠一年生植物种群的经验估计表明，对大多数物种来说，产量随着个体数量的增加而相对迅速地饱和，这表明生活史差异不太可能改变产量对资源波动的敏感性，至少在该群落中是这样。我们的建模结果表明，了解初级生产对资源波动的敏感性的研究应该更多地关注形成密度-产量关系的种内竞争相互作用，而不是决定时间风险扩散的生活史策略。
To cope with uncertainty and variability in their environment, plants evolve distinct life‐history strategies by allocating different fractions of energy to growth, survival and fecundity. These differences in life‐history strategies could potentially influence ecosystem‐level dynamics, such as the sensitivity of primary production to resource fluctuations. However, linkages between evolutionary and ecosystem dynamics are not well understood.We used an annual plant population model to ask, when might differences in plant life‐history strategies produce differences in the sensitivity of primary production to resource fluctuations?Consistent with existing theory, we found that a highly variable and unpredictable environment led to the evolution of a conservative strategy characterized by relatively low and invariant germination fractions, while a variable but predictable environment favoured a riskier strategy featuring more variable germination fractions. Unexpectedly, we found that the influence of life‐history strategy on the sensitivity of production to resource fluctuations depended on competitive interactions, specifically the rate at which production saturates with the number of competing individuals. Rapid saturation overwhelms the influence of life‐history strategy, but when production saturates more slowly, the risky strategy translated to high sensitivity, whereas the conservative strategy translated to low sensitivity.Empirical estimates from Sonoran Desert annual plant populations indicate that production saturates relatively rapidly with the number of individuals for most species, suggesting that life‐history differences are unlikely to alter sensitivity of production to resource fluctuations, at least in this community.Synthesis. Our modelling results imply that research to understand the sensitivity of primary production to resource fluctuations should focus more on the intraspecific competitive interactions shaping the density–yield relationship than on the life‐history strategies that determine temporal risk‐spreading.
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影响因子：
5.5
作者：
A. Wright;K. Barry;C. Lortie;R. Callaway
通讯作者：
A. Wright;K. Barry;C. Lortie;R. Callaway
沙漠一年生植物种子的密度依赖性发芽反应
影响因子：
2.7
作者：
R. Inouye
通讯作者：
R. Inouye
影响因子：
5.5
作者：
COHEN, D
通讯作者：
COHEN, D
一年生植物的扩散-休眠关系：将模型预测付诸测试
DOI：
10.1086/656271
发表时间：
2010
期刊：
The American Naturalist
影响因子：
--
作者：
W. Siewert;K. Tielbörger
通讯作者：
K. Tielbörger
随机变化环境中的 ESS 萌发策略。
影响因子：
1.4
作者：
S. Ellner
通讯作者：
S. Ellner