Species functional traits affect regional and local dominance across western Amazonian forests

Several studies have documented dominance by few species in Amazonian forests. Dominance patterns in contrasting forest habitats in lowland Amazonia have revealed that dominant species tend to be either locally abundant (local dominants) or regionally frequent (widespread dominants) but rarely both (oligarchs). However, the mechanisms underlying dominance remain unclear. Here, assuming that species traits reflect ecological processes that can lead to dominance, we asked across different habitat types whether: (i) dominance is defined by specific functional profiles and (ii) dominance patterns (local dominants vs. widespread dominants) are associated with different functional traits. We combined census data from 503 forest inventory plots across four lowland forest habitats in western Amazonia with trait information for 2600 tree species, encompassing data collected in the focal plots and data from published sources. We considered traits that relate to leaf, wood, seed and whole-plant st..., We used an extensive dataset consisting of 503 forest inventory plots, ranging from 0.025 to 0.213 ha, across different western Amazonian forests, from Colombia to Bolivia. Plots covered the four main habitat types found in western Amazonia proportionally to their extension in the region, with 76% in terra firme forests, 11% in floodplains, 7% in swamps and 6% in white sands. All trees ≥ 2.5 cm DBH were recorded and identified to species, representing a total of 93,719 individuals, and 2609 species. 
We defined dominant species as those that together account for 50% of the total relative abundance of each habitat type, following ter Steege et al. (2013) and Matas-Granados et al. (2024). We identified dominant species separately by habitat type. We defined two main aspects of dominance: (1) local abundance of dominant species, calculated as the mean local relative abundance (individuals of the species in a plot divided by total individuals in the plot), averaged across the plots whe..., , # Exploring different dominance patterns in western Amazonian forests from a functional trait perspective

[https://doi.org/10.5061/dryad.2280gb60q](https://doi.org/10.5061/dryad.2280gb60q)

### Excel file name = Traits_species_data.xlsx

8 sheet

\"Table_compilation\" sheet = Table where rows are the species of our study and columns the functional traits that we studied. To each species and trait, we included the references where the functional data was extracted from.

\"Legend\" sheet = Legend for the Table_compilation sheet.

\"Workflow\" sheet = Steps followed to generate the compiled trait database.

\"References\" sheet = References from the functional data was extracted.

\"DISPLAMAZ_data\" sheet = functional data from the project led by Manuel J. Macía and Luis Cayuela (CGL2016-75414-P).

\"Legend_DISPLAMAZ\" sheet = Legend for the DISPLAMAZ_data sheet.

\"DBH_max\" sheet = Maximum diameter at breast height calculated for each species from the forest inventory plot data.

\"Legend_DBH_max\" sh...,

多项研究已证实，亚马逊森林中少数物种占据优势主导地位。针对低地亚马逊不同森林生境的优势格局研究显示，优势物种通常可分为两类：一类是局域富集的局域优势种（local dominants），另一类是区域广布的广布优势种（widespread dominants），但极少有物种能同时兼具两种特征（即寡占种oligarchs）。然而，驱动物种形成优势地位的内在机制仍不明晰。

本研究假设物种性状能够反映可促成优势地位形成的生态过程，遂针对不同生境类型提出两个核心问题：（i）物种的优势地位是否由特定的功能性状谱所界定？（ii）不同优势类型（局域优势种vs广布优势种）是否与不同的功能性状相关联？

我们整合了亚马逊西部4种低地森林生境共503块森林监测样地的普查数据，以及2600种树木的性状信息——数据既涵盖样地原位采集的观测值，也来自已发表的公开资料。本研究关注与叶片、木材、种子及整株植物相关的性状……

本研究使用的大型数据集涵盖了503块森林监测样地，单块样地面积介于0.025至0.213公顷之间，分布范围覆盖从哥伦比亚至玻利维亚的亚马逊西部各类森林。样地按照该区域4种主要生境类型的分布比例进行布设：其中76%位于常绿旱地森林（terra firme forests），11%位于泛滥平原生境，7%位于沼泽生境，6%位于白沙生境。所有胸径（DBH, diameter at breast height）≥2.5厘米的树木均被记录并鉴定到物种，总计包含93719株个体，隶属于2609个物种。

我们参考ter Steege等（2013）与Matas-Granados等（2024）的研究方法，将优势物种定义为累计占单一生境总相对丰度50%的物种类群。我们针对每一种生境类型分别鉴定优势物种，并界定了优势地位的两个核心维度：（1）优势物种的局域丰度，即该物种在单块样地内的相对丰度（样地内该物种个体数/样地总个体数）在所有样地中的平均值……

# 基于功能性状视角探索亚马逊西部森林的不同优势格局
https://doi.org/10.5061/dryad.2280gb60q

### Excel文件名：Traits_species_data.xlsx
该文件共包含8个工作表：
1. "Table_compilation"工作表：为本研究物种-功能性状对应表，行代表研究涉及的物种，列代表所研究的功能性状，且为每个物种-性状组合标注了功能数据的来源文献。
2. "Legend"工作表：Table_compilation工作表的注释说明。
3. "Workflow"工作表：构建整合性状数据库的完整流程步骤。
4. "References"工作表：功能数据来源的参考文献列表。
5. "DISPLAMAZ_data"工作表：由Manuel J. Macía与Luis Cayuela主持的项目（项目编号CGL2016-75414-P）所产生的功能性状数据。
6. "Legend_DISPLAMAZ"工作表：DISPLAMAZ_data工作表的注释说明。
7. "DBH_max"工作表：基于森林监测样地数据计算得到的各物种最大胸径值。
8. "Legend_DBH_max"工作表：……