Conspecific density plays a pivotal role in shaping sapling community in highly fragmented subtropical forests
Conspecific density plays a pivotal role in shaping sapling community in highly fragmented subtropical forests
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同种密度在塑造高度分散的亚热带森林中的树苗群落中起着关键作用
DOI：
10.1111/aec.13249
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发表时间：
2022
期刊：
影响因子：
1.5
通讯作者：
Da Silva D
中科院分区：
文献类型：
--
作者：
Da Silva D
热带和亚热带地区拥有高度的生物多样性。生物，环境和人为因素的组合影响树木群落的多样性和组成。在这里，我们使用IFFSC项目的数据来测试的影响同种和异种密度的依赖性，树冠覆盖和距离边缘的树苗种群的229种木本植物在159个地块分布在巴西南部的三种森林类型。所有地块测量两次，标准化时间间隔为5年。为检验各预测因子对种群增长率的影响程度，对每一个物种分别建立了一个普通最小二乘回归模型，并建立了一个包含森林类型、生态类群以及林缘距离与同种密度交互作用的全局混合效应模型，以检验它们对物种总体趋势的影响。我们的分析提供了间接证据，同种密度的依赖性是塑造多样性的森林片段。75.5%的物种存在这种机制，而异种密度影响10%的物种。林冠覆盖影响的种群动态的9.2%的物种和距离边缘影响的物种的7.4%。森林类型有显着的影响，在全球模型中，表明人口动态不同的森林形成。生态组在全球模型中不显着，这表明该机制对物种的影响相似，尽管他们的生态组。到边缘的距离和同种密度之间的相互作用是显着的全球模型中，这表明这种机制之间的内部和边缘的碎片。这项工作是少数几个大规模的分析同种密度依赖破碎次生林之一。我们的研究结果表明，一旦森林建立，同种密度的依赖是至关重要的幼树种群动态，尽管高水平的碎片化。
Tropical and subtropical regions shelter high levels of biodiversity. A combination of biological, environmental and anthropogenic factors influences tree community diversity and composition. Here, we use data from the IFFSC project to test the effect of conspecific and heterospecific density dependence, canopy cover and distance to edge on saplings populations of 229 woody species in 159 plots distributed across three forest types in Southern Brazil. All plots were measured twice with a standardized time interval of 5 years. We fitted one ordinary least square regression model to each species to test the strength of each predictor on the species' population growth rate, and one global mixed effect model including forest type, ecological group and the interaction between distance to edge and conspecific density to test their impact in the overall trend of the species. Our analysis provided circumstantial evidence that conspecific density dependence is shaping diversity of forest fragments. This mechanism was present for 75.5% of the species, while heterospecific density affected 10% of the species. Canopy cover affected the population dynamics of 9.2% of the species and distance to edge affected 7.4% of the species. Forest type had a significant effect in the global model, suggesting that population dynamics differ between different forest formations. Ecological group was not significant in the global model suggesting that the mechanism affects species similarly despite their ecological group. The interaction between distance to edge and conspecific density was significant in the global model, suggesting that this mechanism differs between interior and edge of fragments. This work represents one of the few large‐scale analyses of conspecific density dependence in fragmented secondary forests. Our results show that, once the forest is stablished, conspecific density dependence is crucial in sapling population dynamics, despite high levels of fragmentation.
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影响因子：
3.9
作者：
Brown JH
通讯作者：
Brown JH
DOI：
10.1073/pnas.1800353115
发表时间：
2018-10-30
影响因子：
11.1
作者：
Kellner JR;Hubbell SP
通讯作者：
Hubbell SP
大西洋之母 (Mata Atlântica) 放弃了巴西圣卡塔琳娜州 (Santa Catarina) 的土地
影响因子：
--
作者：
Alexandre Siminski;A. C. Fantini
通讯作者：
A. C. Fantini
医生在控制糖尿病方面的作用需要“侦探”工作
DOI：
10.7556/jaoa.1993.93.7.750
发表时间：
1993
期刊：
Journal of Osteopathic Medicine Journal of Osteopathic Medicine
影响因子：
--
作者：
N. J. Andrews
通讯作者：
N. J. Andrews
使用基于卫星图像的地图和地面清单数据来估计巴西圣卡塔琳娜州剩余大西洋森林的面积
影响因子：
13.5
作者：
A. Vibrans;R. McRoberts;Paolo Moser;Adilson Luiz Nicoletti
通讯作者：
Adilson Luiz Nicoletti