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| 1 | Size-symmetric competition in a shade-tolerant invasive plant显示文摘对拥挤的植物回答在轻费力的种类的看台广泛地被调查了,但是阴影容忍的种类可以不同地反应。在现在的学习,我们在 Alternanthera philoxeroides 的死亡,尺寸不平等,和生物资源分配上调查了密度的效果,阴影容忍的侵略的种。A 的茎碎片。philoxeroides 在低或高的密度被种(6 对 24 每壶种) 不到三个轻层次(10% , 34% ,并且百分之百完整的阳光) 。在 8 个星期以后,幸存是 31% 在有更高起始的密度的壶更低。高密度和低轻层次实质地减少了植物尺寸。吝啬的植物生物资源在高密度、低光的壶从 0.23g 到 4.41g 在低密度并且热点壶。在幸存者的尺寸不平等上没有密度或轻水平的强壮或重要的效果。大多数在响应光的分配和形态学的变化铺平并且拥挤由于植物尺寸和 allometric 生长,与真粘性的小证据。射击分配有小却重要的增加,在最佳的分配理论预言的方向,在低轻层次。我们的结果证明强烈竞争不必是尺寸不对称,并且建议到低轻层次的忍耐在 phenotypic 包含减小粘性。侵略 A 的回答。到拥挤的 philoxeroides 可以是侵略植物在建立是色泽的密切相关的个人的稠密的看台的成功的一个例子容忍,合作,并且与低粘性跟随一条相对固定的 allometric 轨道。 | Xiao-Yun PAN Jacob WEINER Bo LI | 2013 | Journal of Systematics and Evolution2013，51，3： | 5 |
| 2 | Size-asymmetric root competition in deep,nutrient-poor soil显示文摘Aims There is much evidence that plant competition below ground is size symmetric,i.e.that competing plants share contested resources in proportion to their sizes.Several researchers have hypothesized that a patchy distribution of soil nutrients could result in size-asymmetric root competition.We tested this hypothesis.Methods In a greenhouse experiment,Triticum aestivum(wheat)individ-uals of different initial sizes were grown alone or with below-ground competition from one neighbour,in 1 m tall,narrow containers in a nitrogen-poor field soil with(i)no added nitro-gen,(ii)nitrogen fertilizer mixed into the upper 50 cm,and(iii)the same amount of fertilizer mixed into a 20-30 cm deep layer.We measured total leaf length throughout the experiment,and above-ground biomass and nitrogen concentration at harvest.We also measured root depth and frequency over time in a subset of containers.Important Findings Competing plants were half the size of non-competing plants,meaning that root competition was very strong.Root competition was size-asym-metric to some degree in all soil treatments.Neighbours larger than the target plant showed a greater per-unit-size effect on target growth than neighbours smaller than the target.Size variation increased over time for competing individuals,but decreased for non-competing pairs.Contrary to expectations,the presence of a high-nutrient patch reduced the strength and size asymmetry of competition temporarily.Size asym-metry in poor,deep soils may result from directionality in resource interception as roots compete for limited nutrients by growing deeper into soil layers that have not yet been exploited.Root competition can be size asymmetric,but not to the same degree as competition for light. | Camilla Ruø Rasmussen Anne Nygaard Weisbach Kristian Thorup-Kristensen Jacob Weiner | 2019 | Journal of Plant Ecology2019，12，1： | 2 |
| 3 | Species traits and shoot-root biomass allocation in 20 dry-grassland species显示文摘Aims A plant has a limited amount of resources at any time and it allo-cates them to different structures.in spite of the large number of previous studies on allocation patterns within single species,knowledge of general patterns in species allocation is still very limited.This is because each study was done in different condi-tions using different methodology,making generalization dif-ficult.We investigate intraspecific above-versus below-ground biomass allocation among individuals across a spectrum of dry-grassland plant species at two different developmental stages and ask whether allocation is age-and species specific,and whether differences among species can be explained by their life-history traits and phylogeny.Methods We collected data on above-and below-ground biomass of seedlings and adult plants of 20 species from a common garden experiment.We analysed data on shoot-root biomass allocation allometrically and studied the relationship between the allometric exponents(slopes on log-log scale),species life-history traits and phylogenetic distances.Important Findings We found isometric as well as allometric patterns of biomass alloca-tion in the studied species.Seedlings and adult individuals of more than half of the species differed in their above-versus below-ground biomass allometric exponents.Seedlings and adult individuals of the remaining species differed in their allometric coefficients(inter-cepts).Annual species generally allocated proportionally more to above-than below-ground biomass as seedlings than as adults,whereas perennial species showed the opposite pattern.Plant life-history traits,such as plant life span,age of first flowering,month in which the species begin flowering and specific leaf area were much more important in explaining differences in shoot-root allometry among species than were phylogenetic relationships.This suggests that allocation patterns vary greatly among closely related species but can be predicted based on species life-history traits. | Iveta Husáková Jacob Weiner Zuzana Münzbergová | 2018 | Journal of Plant Ecology2018，11，2： | 2 |
| 4 | Cognitive Dysfunction and Depression in Adult Kidney Transplant Recipients: Baseline Findings from the FAVORIT Ancillary Cognitive Trial (FACT)显示文摘 | Aron M. Troen Tammy M. Scott Kristen E. D’Anci Denish Moorthy Beverly Dobson Gail Rogers Daniel E. Weiner Andrew S. Levey Gerard E. Dallal Paul F. Jacques Jacob Selhub Irwin H. Rosenberg | 2012 | Journal of Renal Nutrition2012，，2： | 1 |
| 5 | 对植物物种相互作用备选模型的需求显示文摘近年来,经典的Lotka-Volterra模型在分析和解释植物物种间竞争性相互作用方面的局限性愈发凸显。目前已经明确的3个问题是:(1)缺乏频率依赖性,其对于物种的长期共存至关重要;(2)需要考虑影响个体表现的未测量(通常不可测量)的变量(例如,土壤养分或病原体的空间变化);以及(3)需要将测量误差与生物变异度分开。本文改进了经典的Lotka-Volterra竞争模型以期突破模型的局限。同时,我们将8个备选模型与丹麦草本植物群落中羊茅(Festuca ovina)和细弱剪股颖(Agrostis capillaris)3年以上的盖度数据拟合,应用贝叶斯建模框架来确定模型改进是否提高了模型的性能,并提高了其预测群落动态并因此检验假设的能力。研究结果表明,纳入频率依赖性和测量误差极大地改进了模型性能,但将可能的未测量变量考虑在内却未能改进其性能。我们的研究结果强调了在植物群落动态的定量研究中比较备选模型的重要性。只有考虑可能的备选模型,我们才能确定驱动群落构建和变化的因子,并提高我们预测植物群落行为的能力。 | Christian Damgaard Jacob Weiner | 2021 | Journal of Plant Ecology2021，14，5： | 1 |
| 6 | Are invasive plant species betterexperiments 显示文摘 | Vila Montserrat Jacob Weiner | 2004 | Oikos2004，105，2： | 1 |
| 7 | The meaning and measurement of size hierarchies in plant populations显示文摘 | Jacob Weiner Otto T. Solbrig | 1984 | Oecologia1984，，3： | 1 |
| 8 | Describing inequality in plant size or fecundity显示文摘 | Christian Damgaard Jacob Weiner | 2000 | Ecology2000，81，4： | 1 |
| 9 | Convergence of community composition during secondary succession on Zokor rodent mounds on the Tibetan Plateau显示文摘Aims The community succession theory is much debated in ecology.We studied succession on Zokor rodent mounds on the Tibetan Plateau to address several fundamental questions,among them:(i)During secondary succession,does the community composition converge towards one community state or multiple states depending on the initial colonization?(ii)Do mound communities located in different background communities exhibit different assembly trajectories?Methods In a sub-alpine meadow,we investigated a total of 80 mound com-munities at several successional stages in three different background communities resulting from different management histories and compared their changes in species composition.The distribution of plant communities over time was analyzed with quantitative clas-sification and ordination methods.The co-occurrence patterns of species were evaluated at each successional stage,and the degree of convergence/divergence among communities was obtained by calculating two beta-diversity indices.Important Findings During secondary succession,species richness of mound com-munities changed over time,and this change was dependent on the background community.Five life-form groups exhibited different dynamic patterns in species richness and plant cover.Community composition and the degree of species co-occur-rence between communities increased over time since disturb-ance.There was much variation in species composition at earlier stages of succession,but communities on older mounds became more similar to each other and to their surrounding vegetation over the course of secondary succession.Post-disturbance suc-cession of Zokor mound communities transitioned from‘multiple alternative states’to‘background-based deterministic commu-nity assembly’over time.Tradeoffs between competition and colonization,as well as the characteristics of different life-forms and mass effects within a limited species pool are the mecha-nisms responsible for convergence of mound communities. | Yingbo Yang Jacob Weiner Gang Wang Zhengwei Ren | 2018 | Journal of Plant Ecology2018，11，3： | 1 |
| 10 | Allocation, plasticity and allometry in plants显示文摘 | Jacob Weiner | 2004 | Perspectives in Plant Ecology Evolution and Systematics2004，，4： | 1 |
| 11 | Modeling the growth of individuals in crowded plant populations显示文摘Aims We present an improved model for the growth of individuals in plant populations experiencing competition.Methods Individuals grow sigmoidally according to the Birch model,which is similar to the more commonly used Richards model,but has the advantage that initial plant growth is always exponential.The individual plant growth models are coupled so that there is a maximum total biomass for the population.The effects of size-asymmetric competition are modeled with a parameter that reflects the size advantage that larger individual have over smaller individuals.We fit the model to data on individual growth in crowded populations of Chenopodium album.Important Findings When individual plant growth curves were not coupled,there was a negative or no correlation between initial growth rate and final size,suggesting that competitive interactions were more important in determining final plant size than were plants’initial growth rates.The coupled growth equations fit the data better than individual,uncoupled growth models,even though the number of estimated parameters in the coupled competitive growth model was far fewer,indicating the importance of modeling competition and the degree of size-asymmetric growth explicitly.A quantitative understanding of stand development in terms of the growth of individuals,as altered by competition,is within reach. | Christian Damgaard Jacob Weiner | 2008 | Journal of Plant Ecology2008，1，2： | 1 |
| 12 | Mechanisms determining the degree of size asymmetry in competition among plants显示文摘 | Susanne Schwinning Jacob Weiner | 1998 | Oecologia1998，，4： | 1 |
| 13 | Describing inequali- ty in plant size or fecundity显示文摘 | Christian Damgaard Jacob Weiner | 2002 | Ecology2002，81，4： | 1 |
| 14 | 亲缘选择在植物从营养分配向繁殖分配转变中的潜在作用显示文摘根据经典的最优繁殖分配理论,植物生长过程中从营养生长向繁殖分配的转变是突然发生的。一些植物确实如此,这也是农作物产量最大化的一种有效策略。然而,自然界很多植物从营养生长向繁殖分配的转变是渐进发生的。一些修正的生物量分配理论也预测了这种渐变趋势。本研究假设亲缘选择能够改变最优分配理论的预测。通过数学模型,我们研究了正负亲缘选择对植物向繁殖器官分配能量起始时间的影响。基于代价与收益的合理假设,当繁殖器官与营养器官起始生物量比值较高时,处于亲缘选择作用下的植物更可能以一种突变的方式实现从营养生长向繁殖生长的转变。经验数据的观测支持我们的理论预测。这一研究在连接植物生活史与能量分配以及提高农业产量方面具有重要意义。 | Renfei Chen Cenxi Shi Liang Zhang Chengyi Tu Jacob Weiner | 2023 | Journal of Plant Ecology2023，16，6： | 0 |
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