RANK CLOCKS AND PLANT COMMUNITY DYNAMICS
RANK CLOCKS AND PLANT COMMUNITY DYNAMICS
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DOI：
10.1890/07-1646.1
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发表时间：
2008-12-01
期刊：
影响因子：
4.8
通讯作者：
Clark, Christopher M.
中科院分区：
文献类型：
--
作者：
Collins, Scott L.;Suding, Katharine N.;Clark, Christopher M.
总结社区中复杂的时间动态很难以产生直观变化的方式实现。排名时钟和排名丰度统计数据为显示和量化社区动态提供了图形和分析框架。我们使用的排名时钟，其中每个物种的排名顺序丰富度随时间的顺时针方向绘制，显示物种丰度和丰富度的时间变化。我们使用平均等级转移和比例物种持久性来量化长期数据集的群落结构的变化，从施肥和控制地块在后期演替的老领域，经常和不经常烧毁高草草原，奇瓦瓦沙漠草原和灌木群落。等级时钟表明，相对恒定的物种丰富度掩盖了相当大的相对物种丰度的时间动态。在旧的领域，施肥地块最初经历了高的平均秩的变化，稳定迅速低于未施肥地块。排名变化较高，不经常烧毁与每年烧毁高草草原和荒漠草原相比，灌丛植被。比例持续性表明，草地和草地比中质草地更具动态性。我们的结论是，排名时钟和排名丰度统计提供了重要的见解社区动态，往往是隐藏在传统的单变量方法。
Summarizing complex temporal dynamics in communities is difficult to achieve in a way that yields an intuitive picture of change. Rank clocks and rank abundance statistics provide a graphical and analytical framework for displaying and quantifying community dynamics. We used rank clocks, in which the rank order abundance for each species is plotted over time in temporal clockwise direction, to display temporal changes in species abundances and richness. We used mean rank shift and proportional species persistence to quantify changes in community structure in long-term data sets from fertilized and control plots in a late successional old field, frequently and infrequently burned tallgrass prairie, and Chihuahuan desert grassland and shrubland communities. Rank clocks showed that relatively constant species richness masks considerable temporal dynamics in relative species abundances. In the old field, fertilized plots initially experienced high mean rank shifts that stabilized rapidly below that of unfertilized plots. Rank shifts were higher in infrequently burned vs. annually burned tallgrass prairie and in desert grassland compared to shrubland vegetation. Proportional persistence showed that and grasslands were more dynamic than mesic grasslands. We conclude that rank clocks and rank abundance statistics provide important insights into community dynamics that are often hidden by traditional univariate approaches.