在探讨生物多样性时，我们常常提到两个重要的辛普森指数：辛普森多样性指数（Simpson's diversity index）和辛普森相似性指数（Simpson similarity index），这两个指数在物种多样性评估中扮演着关键角色，但它们关注的焦点不同。辛普森多样性指数主要用于评估物种丰富度和相对丰度（alpha多样性），而辛普森相似性...
在微生物组研究中，alpha diversity即“分析在单个样本中有多少种不同的序列”；beta diversity即“分析在一定范围内样本中，各种不同序列的分布情况”。网页链接 网页链接
之后计算Beta多样性 这里的代码使用的是官网上201802的,和之前2017的有一点点区别,主要是分组的时候 --m-metadata-category 要改为 --m-metadata-column qiime diversity beta-group-significance \ --i-distance-matrix core-metrics-results/unweighted_unifrac_distance_matrix.qza \ --m-metadata-file sample-...
alpha, beta, and gammadata simulationdiversity partitioningmultiplicative partitioningstatistical independenceDiversity partitioning has become a popular method for analyzing patterns of alpha and beta diversity. A recent evaluation of the method emphasized a distinction between additive and multiplicative ...
Veech and Thomas O. Crist 摘要: Diversity partitioning has become a popular method for analyzing patterns of alpha and beta diversity. A recent evaluation of the method emphasized a distinction between additive and multiplicative partitioning and further advocated the use of multiplicative partitioning ...
Distance-related diversity (i.e., beta) is low across both spatially adjacent and distant plots. Floodplain habitats show a slightly higher decay of similarity with distance than either terra firme habitats or cross-habitat comparisons. Cross-habitat comparisons are significantly less similar than ...
Species diversity may be additively partitioned within and among samples (alpha and beta diversity) from hierarchically scaled studies to assess the proportion of the total diversity (gamma) found in different habitats, landscapes, or regions. We developed a statistical approach for testing null hypoth...
We found that species and functional beta diversity was related to different socioeconomic and marine environmental variables (F = 1.490, p = 0.001,AdjustedR2 = 0.131and F = 1.420, p = 0.003,AdjustedR2 = 0.114,respectively). Species beta diversity of CMSES9 was as...
Our objective in this study was to experimentally determine the effect of high and low disturbance regimes, frequency and intensity combined, on marine benthic alpha and beta diversity. The experiment was conducted in a rock pool system of the St. Lawrence estuary, Canada. Rock pools were ...
Alpha (α) keratins are found in all vertebrates, while beta (β) keratins are found exclusively in reptiles and birds. We have studied the molecular evolution of these gene families in the genomes of 48 phylogenetically diverse birds and their expression in the scales and feathers of the ...