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Species Diversity and Richness 4 is designed for professional ecologists and their students. The methods on offer range from the familiar, such as the calculation of various diversity indices and the fitting of common distributions, to more recently-developed techniques such as total species complement estimators. Taken together they provide a powerful suite of methods to explore, compare and analyse community structure.


In developing version 4 of this program we have consulted recent literature and have implemented the methods featured in Magurran (2004), Measuring Biological Diversity, and Southwood and Henderson (2002), Ecological Methods - 3rd edition.


Both these books are recommended for further information on the methods offered by Species Diversity and Richness.


The Species Diversity and Richness Version 4, first released in January 2006, includes the following additions and enhancements:


An improved user interface and graphics
No maximum size for the data set  -  all arrays are dynamically sized
Increased range of evenness measures, (Smith & Wilson -  B, 1/D, -ln(d), and 1-D, Camargo, NHC, Simpson E, Heip, etc).
Addition of Menhinick, Gini and Strong's alpha diversity indices
Addition of Harrison's beta diversity measures
Jackknife estimation of standard error implemented
Improved rarefaction methods and sample interpolation
Improved help system with tutorials
Improved BMWP scores for water quality assessment
New species richness estimator for open systems studied long-term - Henderson
A sample comparison feature quickly finds the species in common
Maximum size of any observation increased to 2147483647.



Species Diversity and Richness version 3 offered considerable improvements over versions 1 & 2, with a redesigned menu system and improved graphics, data input and printing. Probably the greatest changes were the much-extended range of methods and statistical tests on offer. Additions included:

bootstrap methods for estimating 95% confidence intervals for all diversity indices,
a randomisation test for the significance of the difference in indices between samples,
additional diversity measures including Fisher's a, the Q statistic and Brillouin indices,
the right-tailed sum method for diversity ordering,
the fitting and plotting of Geometric, log series, truncated log normal and broken stick abundance distributions to observations,
the generation of simulated data conforming to a range of distributions
beta diversity measures.


Version 3, completed in November 2002, offered further enhancements and additions, as itemised below:

An improved user interface and graphics,
Increased range evenness (equitability) measures NHC,
2nd order jackknife species richness measure,
K-Dominance plots,
SHE analysis for beta diversity,
LIFE scores as used in water quality monitoring.