在宽泛的物种多样性的领域内有两个辛普森指数,虽然名字相似,但是本质不同,Simpson's diversity index 用于计算物种丰富度和相对丰度(alpha多样性),而Simpson similarity index 或 Simpson similarity index 用于计算不同的取样单位内的物种相似性(beta 多样性)。 辛普森多样性指数(Simpson's diversity index): 来源: ...
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...
A temporal beta‐diversity Index (TBI) is computed for each site, measuring the change in species composition between the first (T1) and second surveys (T2). TBI indices can be decomposed into losses and gains; they can also be tested for significance, allowing one to identify the sites ...
α多样性(Alpha Diversity)即生境内的多样性(within-habitat diversity),是指某一栖息地或微生物群落在物种水平上数目和频率的分布特征,包含物种的丰富度和均匀度。丰富度是指特定生境内的物种数量,与丰度(某物种个体数量)无关。均匀度是指特定生境内的物种间的丰度差异大小,所有物种丰度一致则均匀度最高。Alpha多样...
Beta-diversity connects biodiversity at the local and regional scale (Barwell, Isaac, & Kunin, 2015; de Miranda, Pereira, Corley, & Merckx, 2019). The diversity index for Beta diversity is calculated for each pair of samples, represents similarity or dissimilarity between the two. Different ...
append(bug_abundances_one_sample) return beta_diversity(diversity_metric, matrix, ids) def get_valid_samples(self): # this function is to return a list of valid samples to match with metadata. raw_df = pd.read_csv(self.abundance_table, sep = "\t", index_col = False) df = raw_df...
物种多样性主要从三个层面进行衡量,分别是α多样性、β多样性和γ多样性。每个衡量尺度所呈现的多样性角度不同。β多样性又称生境间的多样性(between-habitat diversity),是指沿环境梯度不同生境群落之间物种组成的相异性。 分析流程 ### 读取数据 (可后台获取) otu<...
To assess the diversity, the diversity index was grouped in three significant differences of environmental characteristics, different ways. First, mesocosms under the same OTU richness, and the relative abundance of phylum warming scenarios were allocated to the same group and of lineages and clades ...
40、similarity& Knight, 2005)和系统发育Srensen指数(phylogen- etic Srensen index) (Bryant et al., 2008)。另外, Ackerly和Cornwell (2007)从功能性状的角度, 提出功能beta多样性(functional beta diversity), 并给出了度量方法。2 beta多样性的时空格局了解beta多样性的时空格局能为回答许多生态学、生物地理...
append(bug_abundances_one_sample) return beta_diversity(diversity_metric, matrix, ids) def get_valid_samples(self): # this function is to return a list of valid samples to match with metadata. raw_df = pd.read_csv(self.abundance_table, sep = "\t", index_col = False) df = raw_df...