Multiple filters affect tree species assembly in mid-latitude forest communities
Multiple filters affect tree species assembly in mid-latitude forest communities
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DOI：
10.1007/s00442-018-4122-6
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发表时间：
2018-04
期刊：
影响因子：
2.7
通讯作者：
Y. Kubota;Buntarou Kusumoto;Takayuki Shiono;Werner Ulrich
中科院分区：
文献类型：
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作者：
Y. Kubota;Buntarou Kusumoto;Takayuki Shiono;Werner Ulrich
本地群落的物种聚集模式是由多个非生物/生物过滤器和分散之间的平衡所塑造的，这两个过滤器都是从区域尺度的物种库中选择个体。关于功能组装的知识可以提供对形成物种组装的确定性和随机过程的相对重要性的见解。通过分析相对于功能性状的环境过滤对中纬度森林树种组合地理格局的影响，评价了α生态位和β生态位的等级作用。利用森林样地数据集，研究了树种的α生态位性状（叶片和木材性状）和β生态位性状（耐寒/耐旱性状），并基于假设与生物地理区域相关的两种物种池的零模型检验了性状组合的非随机性（聚类/过度分散）。对于大多数样地，物种聚集模式落在随机期望的范围内。然而，特别是耐寒/耐旱相关的β生态位特性，经常发现偏离随机性；非随机聚类在气候恶劣的高纬度地区占主导地位。我们的研究结果表明，性状组装中的随机性和非随机性都是α和β生态位的结果，尽管我们提出了通过性状相似性产生随机性流行的分散过程和/或物种均衡的潜在作用。β生态位性状沿纬度气候梯度的聚类为物种通过过滤特定性状进行分选提供了明确的证据。研究结果表明，通过功能生态位和随机过程的多重过滤共同塑造了中纬度森林物种聚集的地理格局。
Species assembly patterns of local communities are shaped by the balance between multiple abiotic/biotic filters and dispersal that both select individuals from species pools at the regional scale. Knowledge regarding functional assembly can provide insight into the relative importance of the deterministic and stochastic processes that shape species assembly. We evaluated the hierarchical roles of the α niche and β niches by analyzing the influence of environmental filtering relative to functional traits on geographical patterns of tree species assembly in mid-latitude forests. Using forest plot datasets, we examined the α niche traits (leaf and wood traits) and β niche properties (cold/drought tolerance) of tree species, and tested non-randomness (clustering/over-dispersion) of trait assembly based on null models that assumed two types of species pools related to biogeographical regions. For most plots, species assembly patterns fell within the range of random expectation. However, particularly for cold/drought tolerance-related β niche properties, deviation from randomness was frequently found; non-random clustering was predominant in higher latitudes with harsh climates. Our findings demonstrate that both randomness and non-randomness in trait assembly emerged as a result of the α and β niches, although we suggest the potential role of dispersal processes and/or species equalization through trait similarities in generating the prevalence of randomness. Clustering of β niche traits along latitudinal climatic gradients provides clear evidence of species sorting by filtering particular traits. Our results reveal that multiple filters through functional niches and stochastic processes jointly shape geographical patterns of species assembly across mid-latitude forests.