Linking seed size and number to trait syndromes in trees
Linking seed size and number to trait syndromes in trees
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DOI：
10.1111/geb.13652
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发表时间：
2023-03-07
影响因子：
6.4
通讯作者：
Clark, James S.
中科院分区：
文献类型：
--
作者：
Bogdziewicz, Michal;Acuna, Marie-Claire Aravena;Clark, James S.
目的我们对在气候变化下保持森林多样性的机制的理解可以受益于与适合度密切相关的性状的知识。我们测试了性状和种子数量和种子大小之间的联系是否与两个假设相一致，称为叶经济谱和植物大小综合征，或者繁殖是否代表一个独立的维度相关的种子大小种子数量trade-off.Location大部分的数据来自欧洲，北美，中美洲和东亚。少数数据来自南美洲，非洲和澳大利亚。时间段1960 - 2022。主要类群研究Trees.Methods我们收集了784个树种产生的种子数量的1200万个观察结果。我们估计了每棵树产生的种子数量，并将其扩大到物种水平。接下来，我们使用主成分分析和广义联合属性建模（GJAM）映射种子的数量和大小上的树traits spectrum.Results的种子大小和数量到性状分析，同时控制环境和遗传与GJAM暴露在树木中的关系，否则可能仍然隐藏。种子总生物量的大生产[种子数量和种子大小的乘积;以下，物种种子生产力（SSP）]与高叶面积、低叶氮、低比叶面积（SLA）和致密木材相关。高种子数量的生产与营养需求的物种产生的小种子有关，这些物种具有软木，小叶和高SLA。性状的协变是一致的，相反的策略：一个快速增长，早期的演替，高扩散，和其他缓慢增长，耐应力，招募在阴影conditions.Main结论地球系统模型目前假设，生殖分配是漠不关心的植物功能类型。易于测量的种子大小是种子数量和物种种子生产力的强有力预测因素。SSP与功能性状的联系可以成为全球森林繁殖力预测的基础。
Aim Our understanding of the mechanisms that maintain forest diversity under changing climate can benefit from knowledge about traits that are closely linked to fitness. We tested whether the link between traits and seed number and seed size is consistent with two hypotheses, termed the leaf economics spectrum and the plant size syndrome, or whether reproduction represents an independent dimension related to a seed size-seed number trade-off.Location Most of the data come from Europe, North and Central America and East Asia. A minority of the data come from South America, Africa and Australia.Time period 1960-2022.Major taxa studied Trees.Methods We gathered 12 million observations of the number of seeds produced in 784 tree species. We estimated the number of seeds produced by individual trees and scaled it up to the species level. Next, we used principal components analysis and generalized joint attribute modelling (GJAM) to map seed number and size on the tree traits spectrum.Results Incorporating seed size and number into trait analysis while controlling for environment and phylogeny with GJAM exposes relationships in trees that might otherwise remain hidden. Production of the large total biomass of seeds [product of seed number and seed size; hereafter, species seed productivity (SSP)] is associated with high leaf area, low foliar nitrogen, low specific leaf area (SLA) and dense wood. Production of high seed numbers is associated with small seeds produced by nutrient-demanding species with softwood, small leaves and high SLA. Trait covariation is consistent with opposing strategies: one fast-growing, early successional, with high dispersal, and the other slow-growing, stress-tolerant, that recruit in shaded conditions.Main conclusions Earth system models currently assume that reproductive allocation is indifferent among plant functional types. Easily measurable seed size is a strong predictor of the seed number and species seed productivity. The connection of SSP with the functional traits can form the first basis of improved fecundity prediction across global forests.