Genotypic diversity effects on the performance of Taraxacum officinale populations increase with time and environmental favorability.
Genotypic diversity effects on the performance of Taraxacum officinale populations increase with time and environmental favorability.
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DOI：
10.1371/journal.pone.0030314
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Vellend M
中科院分区：
文献类型：
--
作者：
Drummond EB;Vellend M
种群内遗传多样性影响许多生态过程，但很少有研究考察环境条件如何影响这些短期多样性效应。在4个生长季节里，我们在相对有利的休耕和不利的刈割草坪环境处理下，对无所不在的无性系蒲公英（Taraxacum officinale）不同基因型数量的实验群体进行了跟踪研究。种群表现（以总叶面积、种子产量或生物量衡量）随着多样性的增加而明显而持续地增加，并且这种效应在试验过程中变得更强。与刈割草坪相比，休耕草地的多样性效应更强，但机制不同。大基因型在休耕地占主导地位，驱动高产（通过积极的选择效应），而在修剪过的草坪上，其表现受到常规干扰的限制，有证据表明基因型之间存在互补性（特别是一种紧凑的基因型在混合中比单一栽培表现更好）。因此，我们预测在激烈的种内竞争增强基因型差异的环境中，更强的基因型多样性效应。我们为期四年的田间试验和育苗试验表明，基因型多样性效应具有深远的、环境依赖性的代际影响。
Within-population genetic diversity influences many ecological processes, but few studies have examined how environmental conditions may impact these short-term diversity effects. Over four growing seasons, we followed experimental populations of a clonal, ubiquitous weed, Taraxacum officinale, with different numbers of genotypes in relatively favorable fallow field and unfavorable mowed lawn environmental treatments. Population performance (measured as total leaf area, seed production or biomass) clearly and consistently increased with diversity, and this effect became stronger over the course of the experiment. Diversity effects were stronger, and with different underlying mechanisms, in the fallow field versus the mowed lawn. Large genotypes dominated in the fallow field driving overyielding (via positive selection effects), whereas in the mowed lawn, where performance was limited by regular disturbance, there was evidence for complementarity among genotypes (with one compact genotype in particular performing better in mixture than monoculture). Hence, we predict stronger genotypic diversity effects in environments where intense intraspecific competition enhances genotypic differences. Our four-year field experiment plus seedling establishment trials indicate that genotypic diversity effects have far-reaching and context-dependent consequences across generations.
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影响因子：
4.9
作者：
Crawford, K. M.;Whitney, K. D.
通讯作者：
Whitney, K. D.
DOI：
10.1073/pnas.0500078102
发表时间：
2005-05-24
影响因子：
11.1
作者：
de Roode, JC;Pansini, R;Read, AF
通讯作者：
Read, AF
DOI：
10.1073/pnas.1033107100
发表时间：
2003-07-22
影响因子：
11.1
作者：
Fargione, J;Brown, CS;Tilman, D
通讯作者：
Tilman, D
影响因子：
4.8
作者：
Cook-Patton, Susan C.;McArt, Scott H.;Agrawal, Anurag A.
通讯作者：
Agrawal, Anurag A.
影响因子：
3.4
作者：
Griffin, John N.;Jenkins, Stuart R.;Thompson, Richard C.
通讯作者：
Thompson, Richard C.