Understanding different dominance patterns in western Amazonian forests

Understanding different dominance patterns in western Amazonian forests
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了解亚马逊西部森林的不同优势模式

DOI:
10.1111/ele.14351
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发表时间:
2023
期刊:
影响因子:
8.8
通讯作者:
Matas-Granados L
Matas-Granados L
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Matas-Granados L

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新热带乔木群落由少数几个物种构成的优势已被广泛记载,但优势树种显示出各种分布模式,但人们对此仍知之甚少。本文利用503个森林调查样地(93,719个个体≥2.5 cm直径,2,609种),探讨了亚马孙西部4种主要生境类型优势种的局部多度、区域频度和空间聚集度之间的关系。尽管整个数据集的丰度-占用关系是正的,但我们发现,在亚马逊优势树种中,局部丰度与区域频率和/或栖息地类型的空间聚集之间存在强烈的负相关关系。我们的发现表明了一种生态权衡,即优势物种可以是局部丰富的(本地优势种),也可以是区域广泛分布的(广泛优势种),但很少同时存在(寡头)。鉴于优势物种作为多样性和生态系统功能驱动力的重要性,揭示不同的优势模式是指导亚马逊森林保护工作的研究重点。
Dominance of neotropical tree communities by a few species is widely documented, but dominant trees show a variety of distributional patterns still poorly understood. Here, we used 503 forest inventory plots (93,719 individuals ≥2.5 cm diameter, 2609 species) to explore the relationships between local abundance, regional frequency and spatial aggregation of dominant species in four main habitat types in western Amazonia. Although the abundance‐occupancy relationship is positive for the full dataset, we found that among dominant Amazonian tree species, there is a strong negative relationship between local abundance and regional frequency and/or spatial aggregation across habitat types. Our findings suggest an ecological trade‐off whereby dominant species can be locally abundant (local dominants) or regionally widespread (widespread dominants), but rarely both (oligarchs). Given the importance of dominant species as drivers of diversity and ecosystem functioning, unravelling different dominance patterns is a research priority to direct conservation efforts in Amazonian forests.
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