Rarefied Species Curve Point
Estimate a rarefied species count with a documented half-saturation form: species total times sample over sample plus half-saturation, where the half-saturation defaults to the total individual count rounded up to its half.
Description
Estimate a rarefied species count with a documented half-saturation form: species total times sample over sample plus half-saturation, where the half-saturation defaults to the total individual count rounded up to its half.
Rarefied Species Curve Point is a focused biology tool that estimate a rarefied species count with a documented half-saturation form: species total times sample over sample plus half-saturation, where the half-saturation defaults to the total individual count rounded up to its half. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use Rarefied Species Curve Point
Use Rarefied Species Curve Point when you need to estimate a rarefied species count with a documented half-saturation form: species total times sample over sample plus half-saturation, where the half-saturation defaults to the total individual count rounded up to its half. Enter Species total, Total individuals, Sample individuals, and Half saturation using the definitions and units below so the result can be reproduced.
- Species total
- An integer count or setting greater than or equal to 1.
- Total individuals
- An integer count or setting greater than or equal to 1.
- Sample individuals
- An integer count or setting greater than or equal to 1.
- Half saturation
- Optional integer half-saturation constant; defaults to ceil(total individuals / 2).
How Rarefied Species Curve Point calculates the result
The published tool contract uses this rule: Estimate a rarefied species count with a documented half-saturation form: species total times sample over sample plus half-saturation, where the half-saturation defaults to the total individual count rounded up to its half.
- Rarefied species count
- The calculated rarefied species count.
Limitations of Rarefied Species Curve Point
The output is an estimate tied to the stated model and coefficients; it is not a direct measurement and should retain that label when reported.
Alternative or Complementary measurements
Retain the original Species total, Total individuals, Sample individuals, and Half saturation values and their units alongside the result. Accumulation Slope Segment is useful when you instead need to compute the species accumulation rate for one survey segment as new species divided by units of sampling effort. Rarefied Richness provides another view by helping you estimate rarefied species richness with the documented linear form sTotal x m / n for a subsample of m individuals drawn from n.
References
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Species discovery curve — Wikipedia contributors
Similar or alternative tools
- Accumulation Slope Segment
Compute the species accumulation rate for one survey segment as new species divided by units of sampling effort.
- Rarefied Richness
Estimate rarefied species richness with the documented linear form sTotal x m / n for a subsample of m individuals drawn from n.
- ACE Bias Corrected
Estimate abundance-based species richness with ACE using the species observed at most ten times, their total individuals, singleton count, and the rare-frequency moment sum i(i-1)f_i. ACE is undefined when every rare individual is a singleton.