Multiple mechanisms of species coexistence as a basis for biodiversity maintenance and ecosystem functioning

物种共存的多种机制作为生物多样性维护和生态系统功能的基础

• 批准号: 289388389
• 负责人: Professor Dr. Markus Fischer
• 金额: --
• 依托单位: Plant Ecology
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289388389?language=en
• 关键词: Multiple; mechanisms; species; coexistence; basis

Explaining the mechanisms underlying species coexistence is fundamental for understanding the maintenance of biodiversity at local scale and the effects of biodiversity on ecosystem functioning. In this subproject we will analyse the time course of population dynamics in the plant communities of the Jena Experiment to test for multiple mechanisms of species coexistence.(1) We will apply competitive network theory by analysing whether the possibility to predict species` competitive ranks from pair-wise competition matrices decreases with increasing plant diversity and by evaluating how it relates to the functional traits of the involved species.(2) Based on recent coexistence theory, we will test for negative frequency-dependence of population growth as an indicator of stabilizing niche differences. We will explore the single and cumulative effects of various predictors related to stabilizing mechanisms such as functional trait differences among species as indicator for niche complementarity in resource use, frequency-dependent attack of natural enemies (herbivores, fungal pathogens) and species-specific responses to environmental variation as well as the importance of relative fitness differences derived from seed and seedling demographic rates.(3) We will explore the consequences of intransitivity in competition networks and mean rank shifts in species abundances for multiple ecosystem functions and their temporal variability.(4) Finally, we will study how plant-soil feedback affects plant performance and invasion resistance of the plant communities by contributing to the new DeLT-BEF with a phytometer study focusing on species with low and high performance, respectively, in the communities of the long-term main experiment and studying the composition of the spontaneously colonizing species in the different treatments of the DeLT-BEF.In summary, the synthesis analyses of the long time series of population dynamics, together with a unique compilation of data related to different mechanisms potentially explaining species coexistence and the new experimental data obtained in this subproject, will advance our understanding of the maintenance of biodiversity in local species assemblages and its consequences for ecosystem functioning.

解释存在物种共存的机制对于理解局部规模的生物多样性以及生物多样性对生态系统功能的影响至关重要。在本次项目中，我们将分析Jena实验植物社区中种群动态的时间过程，以测试物种共存的多种机制。（1）我们将通过分析竞争性网络理论来分析物种从成对的竞争中预测物种竞争等级的可能性是否会降低植物多样性，并通过植物多样性降低植物的多样性和与IT相关性的作用范围，并涉及该物种的涉及范围，并涉及该物种涉及的涉及型号，该竞争性涉及涉及的物种涉及的涉及（2）涉及该物种涉及的涉及（涉及该物种的范围）。我们将测试人口增长的负频率依赖性，作为稳定利基差异的指标。 We will explore the single and cumulative effects of various predictors related to stabilizing mechanisms such as functional trait differences among species as indicator for niche complementarity in resource use, frequency-dependent attack of natural enemies (herbivores, fungal pathogens) and species-specific responses to environmental variation as well as the importance of relative fitness differences derived from seed and seedling demographic rates.(3) We will explore the consequences of竞争网络中的不安和平均等级在多个生态系统功能及其时间变化的物种丰度的变化。（4）最后，我们将研究植物土壤反馈如何通过对植物群体进行植物群落的植物表现和抗击性，通过对植物群体进行新的植物群体的介绍，以低和高表现的构建，并分别研究植物群体的耐药性。总而言之，长期序列人口动态的合成分析，以及与不同机制有关的数据相关的数据，对物种共存以及该亚副标中获得的新实验数据的独特汇编将推动我们对生物多样性的维持在本地物种中的维持，并将其用于其影响力的影响，从而及其在本地物种中的维护，殖民物种的综合分析以及与不同机制的不同机制相关的数据的独特汇编以及其在本地物种中的维持及其对局部物种的维护，及其在本地物种中的维持及其影响力的影响。