1. 物种丰富度 (Richness)---不考虑丰度,即样本中有多少个物种,衡量指标包括Obs,Chao1和Ace。 2. 物种多样性 (Diversity)---将物种个数和物种的丰度全部考虑在内的多样性,衡量指标包括Shannon和Simpson。 3. 物种均匀度 (Eveness)---这些物种的丰度分布情况,衡量指标包括Shannon和Simpson等。 这五个指标说的...
R. Phytoplankton diversity (alpha, beta, and gamma) from the Araguaia River tropical floodplain lakes (central Brazil). Hydrobiologia, v. 575, n. 1, p. 455-461 2007.Nabout, J.C.; Nogueira, I.S.; Oliveira, L.G. & Morais, R.R. 2007. Phyto- plankton diversity (alpha, beta, and ...
The latitudinal distribution patterns of alpha, beta and gamma diversity of reptiles, amphibians and herpetofauna were analyzed using individual binary models of potential distribution for 301 species predicted by ecological modelling for a grid of 9,932 quadrants of ~25 km2 each. We arranged ...
WHERE DOES ALL THE DIVERSITY GO AGAIN? A CENOZOIC PERSPECTIVE ON VARIATIONS IN ALPHA, BETA AND GAMMA DIVERSITY IN SHALLOW MARINE ENVIRONMENTSFluctuations in regional endemism and biogeographic similarity between regions appear related to the opening and closing of major oceanic gateways. Nevertheless some...
simpson_diversity <- 1 / (1 - gini_simpson_index) Simpson 均匀度(equitability 均匀度) equitability <- 1 / (richness * (1 - gini_simpson_index)) Chao1 & ACE Chao1 指数 chao1 <- estimateR(otu)[2, ] ACE 指数 ace <- estimateR(otu)[4, ] ...
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...
Beta diversity, rather than alpha diversity per se, appears to be the main driver of spatial differences in gamma diversity between temperate and tropical regions. Conversely, we observed high plant alpha diversity at fine grains but relatively low alpha diversity at coarse grains in many temperate...
613Alpha, Beta, or Gamma: Where Does All the Diversity Go? (1988)J. J. Sepkoski Jr.Commentarypeter wagnerSifting through the works of an outstandingscientist is not unlike going through the record-ings of a great rock band. There are, of course,the big “hits” that everyone associates ...
Molecular Diversity Preservation InternationalEntropyCichocki, A., Cruces, S., Amari, S. (2011). Generalized Alpha-Beta Divergences and Their Application to Robust Nonnegative Matrix Factorization. Entropy 13, 134-170.A. Cichocki, S. Cruces, and S. Amari, "Generalized alpha-beta divergences and ...
regarding diversity partitioning has provided an overviewabout the recent developments on the partition of gamma diversity into alpha diversity andbeta diversity... 趙蓮菊 - 《理學院 - College of》 被引量: 0发表: 2011年 False Matches and Non-independence of Face Recognition Scores Although face re...