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...
Here, we adopted a probability-based definition of statistical independence that is essentially identical to the definition found in any statistics textbook. We used a data simulation approach to show that alpha and beta diversity are not statistically independent in either additive or multiplicative ...
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
Here, we adopted a probability-based definition of statistical independence that is essentially identical to the definition found in any statistics textbook. We used a data simulation approach to show that alpha and beta diversity are not statistically independent in either additive or multiplicative ...
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 ...
Oral microbiomes of women with high anxiety or depression symptoms showed a high alpha diversity, which means they included many types of microbe species present at relatively even levels. FromScience Daily He describes her as the “alpha” character of the family who always gets her way; she ...
We evaluated the changes in abundance, alpha, beta and functional diversity of the community with altitude along transects from 450 to 1150 m asl. We categorized species into functional groups based on their breeding sites, habitat and weight. Alpha diversity for the overall community decreased ...
beta and alpha diversity of the shallow littoral fish communities present in the Andalusian CMSESs and explored how they relate to socioeconomic and marine environmental variables. We used underwater visual surveys to estimate the fish abundance data needed to calculate the alpha and beta diversity ...
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 ...
gini_simpson_index <- diversity(otu, index = 'simpson') 经典Simpson 指数(使用频率比较低) simpson_index <- 1 - gini_simpson_index Invsimpson 指数(Gini-Simpson 的倒数) invsimpson_index <- 1 / gini_simpson_index 或 invsimpson_index <- diversity(otu, index = 'invsimpson') ...